10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_____________________________

FORM10-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES

EXCHANGE ACT OF 1934

For the fiscal year ended May 31, 2016

Commission file number 0-11330

 ____________________________

Paychex,Inc.

911 Panorama Trail South

Rochester, New York 14625-2396

(585) 385-6666

A Delaware Corporation

IRS Employer Identification Number: 16-1124166

Securities registered pursuant to Section 12(b) of the Act:	Common Stock, $0.01 Par Value
Name of exchange on which registered:	NASDAQ Global Select Market

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes ☑    No ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes ☐    No ☑

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes ☑    No ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes☑    No☐

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10‑K.    ☑

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer    ☑	Accelerated filer    ☐	Non-accelerated filer    ☐	Smaller reporting company    ☐
		(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes ☐    No ☑

As of November 30, 2015 the last business day of the most recently completed second fiscal quarter, shares held by non-affiliates of the registrant had an aggregate market value of $17,491,967,248 based on the closing price reported for such date on the NASDAQ Global Select Market.

As of June 30, 2016,360,532,001shares of the registrant’s common stock, $.01 par value, were outstanding.

Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement to be issued in connection with its Annual Meeting of Stockholders to be held on or about October 12, 2016, to the extent not set forth herein, are incorporated by reference into Part III, Items 10 through 14, inclusive.

PAYCHEX, INC.

INDEX TO FORM 10-K

For the fiscal year ended May 31, 2016

	Description	Page
	PART I
	Cautionary Note Regarding Forward-Looking Statements Pursuant to the United States Private Securities Litigation Reform Act of 1995	1
Item 1	Business	2
Item 1A	Risk Factors	7
Item 1B	Unresolved Staff Comments	9
Item 2	Properties	10
Item 3	Legal Proceedings	10
Item 4	Mine Safety Disclosures	10
	PART II
Item 5	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	11
Item 6	Selected Financial Data	13
Item 7	Management’s Discussion and Analysis of Financial Condition and Results of Operations	16
Item 7A	Quantitative and Qualitative Disclosures About Market Risk	28
Item 8	Financial Statements and Supplementary Data	29
Item 9	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	58
Item 9A	Controls and Procedures	58
Item 9B	Other Information	59
	PART III
Item 10	Directors, Executive Officers and Corporate Governance	59
Item 11	Executive Compensation	60
Item 12	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	60
Item 13	Certain Relationships and Related Transactions, and Director Independence	60
Item 14	Principal Accounting Fees and Services	60
	PART IV
Item 15	Exhibits and Financial Statement Schedules	61
	Signatures	63

i

PART I

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS PURSUANT TO THE UNITED STATES PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

Certain written and oral statements made by management of Paychex, Inc. and its wholly owned subsidiaries (“we,” “our,” “us,” “Paychex,” or the “Company”) may constitute “forward-looking statements” within the meaning of the safe harbor provisions of the United States (“U.S.”) Private Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by such words and phrases as “we expect,” “expected to,” “estimates,” “estimated,” “current outlook,” “we look forward to,” “would equate to,” “projects,” “projections,” “projected to be,” “anticipates,” “anticipated,” “we believe,” “believe,” “could be,” and other similar phrases. Examples of forward-looking statements include, among others, statements we make regarding operating performance, events, or developments that we expect or anticipate will occur in the future, including statements relating to our outlook, revenue growth, earnings, earnings-per-share growth, or similar projections.

Forward-looking statements are neither historical facts nor assurances of future performance. Instead, they are based only on our current beliefs, expectations, and assumptions regarding the future of our business, future plans and strategies, projections, anticipated events and trends, the economy, and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks, and changes in circumstances that are difficult to predict, many of which are outside our control. Our actual results and financial conditions may differ materially from those indicated in the forward-looking statements. Therefore, you should not place undue reliance upon any of these forward-looking statements. Important factors that could cause our actual results and financial condition to differ materially from those indicated in the forward-looking statements include, among others, the following:

· generalmarket and economic conditions including, among others, changes in U.S. employment and wage levels, changes to new hiring trends, legislative changes to stimulate the economy, changes in short- and long-term interest rates, changes in the fair value and the credit rating of securities held by us, and accessibility of financing;

· changes in demand for our services and products, ability to develop and market new services and products effectively, pricing changes and the impact of competition;

· changes in the availability of skilled workers, in particular those supporting our technology and product development;

· changes in the laws regulating collection and payment of payroll taxes, professional employer organizations, and employee benefits, including retirement plans, workers’ compensation, health insurance (including health care reform legislation), state unemployment, and section 125 plans;

· changes in health insurance and workers’ compensation rates and underlying claim trends;

· changes in technology that adversely affect our services and products and impact our ability to provide timely enhancements to services and products;

· the possibility of a security breach that disrupts operations or exposes client confidential data;

· the possibility of failure of our operating facilities, computer systems, and communication systems during a catastrophic event;

· the possibility of third-party service providers failing to perform their functions;

· the possibility of a failure of internal controls or our inability to implement business processing improvements;

· the possibility that we may be subject to liability for violations of employment or discrimination laws by our clients and acts or omissions of client employees who may be deemed to be our agents, even if we do not participate in any such acts or violations; and

· potentially unfavorable outcomes related to pending or future (possible) legal matters.

Any of these factors, as well as such other factors as discussed in Part I, Item 1A,“Risk Factors” and throughout Part II, Item 7,“Management’s Discussion and Analysis of Financial Condition and Results of Operations” of this Annual Report on Form 10‑K (“Form 10-K”), as well as in our periodic filings with the Securities and Exchange Commission (“SEC” or “Commission”), could cause our actual results to differ materially from our anticipated results. The information provided in this Form 10‑K is based upon the facts and circumstances known at this time, and any forward-looking statements made by us in this Form 10‑K speak only as of the date on which they are made. Except as required by law, we undertake no obligation to update these forward-looking statements after the date of filing this Form 10-K with the SEC to reflect events or circumstances after such date, or to reflect the occurrence of unanticipated events.

1

Item 1.Business

Incorporated in Delaware in 1979, we are a leading provider of integrated human capital management (“HCM”) solutions for payroll, human resource, retirement, and insurance services for small- to medium-sized businesses. As of May 31, 2016, we serviced approximately 605,000 payroll clients. We maintain our corporate headquarters in Rochester, New York, and serve clients throughout the U.S. and Germany.  We report our results of operations and financial condition as one business segment. Our fiscal year ends May 31st.

Company Strategy

Our mission is to be the leading provider of payroll, human resource and employee benefit services for small- to medium-sized businesses by being an essential partner with America’s businesses.  We believe that success in this mission will lead to strong, long-term financial performance.  Our strategy focuses on the following:

· flexible, convenient service;

· industry-leading, integrated technology;

· solid sales execution;

· comprehensive suite of value-added HCM services;

· continued service penetration; and

· strategic acquisitions.

Services and Products

We offer a comprehensive portfolio of HCM services and products that allow our clients to meet their diverse payroll and human resource needs.  Clients can select services on an á la carte basis or as part of various product bundles.  Our payroll-related ancillary services and Human Resource Service (“HRS”) offerings often leverage the information gathered in the base payroll processing service, allowing us to provide comprehensive outsourcing services covering the HCM spectrum. We also offer professional employer organization (“PEO”) services and provide insurance offerings through the Paychex Insurance Agency, Inc. (“PIA”) that allow employers to expand their employee benefit offerings at an affordable cost. We mainly earn our revenue through recurring fees for services performed. Service revenue is primarily driven by the number of clients, checks or transactions per client per pay period, and utilization of ancillary services.

Paychex FlexSM is our proprietary HCM software-as-a-service (“SaaS”) platform through which we provide an integrated product suite that covers the employee life cycle from recruiting and hiring to retirement. Paychex Flex streamlines workforce management through innovative technology and flexible choice of service. The platform uses a single cloud-based platform, with single client and employee records, and single sign-on, including self-service options and mobility applications. The HCM product suite integrates recruiting and applicant tracking, employee onboarding, payroll, employee benefits and human resource administration, time and attendance, and retirement services. Paychex Flex also provides technology-enabled service, with options that include self-service, a 24/7 dedicated service center, individual payroll specialist, and integrated service via the multi-product service center.  In addition, large clients can utilize a relationship manager for more personalized service.  This flexible platform services our small-business clients, mid-market clients, and our PEO business.

The integration of flexible service options and leading-edge technology allows us to meet our clients' diverse needs by providing them with information and products when, where, and how they want it.  Our Paychex mobile applications add greater value and convenience for our clients and their employees by allowing them instant access and increased productivity.  Paychex Flex allows for device independence, providing a consistent experience regardless of device. Our mobile apps are available for iOS® and AndroidTM tablets and smartphones, and allow our clients and their employees to have full access to our products, offering diverse capabilities for both the employer and employee.

2

Small-Business Clients

For our small-business clients, which we define as typically less than 50 employees, Paychex supports the client in reducing the complexity and risk of running their own payroll, while ensuring greater accuracy with up-to-date tax rates and regulatory information. We simplify their payroll with a combination of our dynamic products and customer service for a quick and easy pay day.  Small-business payroll is provided via our core payroll, utilizing our robust Paychex Flex processing platform, or SurePayroll®  products.  Our core payroll clients can opt for our full-service customer service model through our branch operations or use Paychex Online Payroll®, our secure Internet portal. Paychex Online Payroll offers a suite of self-service and interactive services twenty-four hours a day, seven days a week. Both service models offer payroll processing, employee access online, general ledger service to provide payroll information to the client’s general ledger accounting software, and access to our industry-leading, web-based report center and robust report writer. Our SurePayroll SaaS solution offers “do-it-yourself,” self-service and mobile applications for small business.

Our small-business clients also benefit from our time and attendance products, which allow them to accurately and efficiently manage the gathering and recording of employee hours worked.  Our advanced suite of time and attendance products, including web and mobile tools, can assist companies with the scheduling, tracking, and reporting of time which can be beneficial to clients in complying with overtime regulations recently enacted by the Department of Labor. Other Paychex solutions, such as our comprehensive human resource outsourcing solutions are also available for our small-business clients.

Mid-Market Clients

Our mid-market clients are typically defined as more than 50 employees with more complex payroll and employee benefit needs.  These clients are serviced through our Paychex Flex Enterprise solution set, which offers an integrated suite of HCM solutions on the Paychex Flex platform, or through our traditional mid-market platform.  Clients using Paychex Flex Enterprise are offered a SaaS solution that integrates payroll processing with human resource management, employee benefits administration, time and labor management, applicant tracking and onboarding solutions.  Paychex Flex Enterprise allows our mid-market clients to choose the services and software they need to meet the complexity of the business and have them integrated through one HCM solution.

Mid-market clients also have the option to select from a number of á la carte payroll and human resource ancillary services and can opt for our comprehensive human resource and payroll outsourcing solutions, Paychex HR Services. This flexibility allows our clients to define the solution that best meets their particular needs.

Description of Services

Payroll processing:  For both our small-business and mid-market clients, payroll processing is the backbone of our portfolio of HCM services.  Payroll processing services include the calculation, preparation, and delivery of employee payroll checks; production of internal accounting records and management reports; preparation of payroll tax returns; and collection and remittance of clients’ payroll obligations.  Along with payroll processing, clients can also select from the following payroll-related ancillary services:

· Payroll tax administration services:   Our payroll tax administration services provide accurate preparation and timely filing of quarterly and year-end tax returns, as well as the electronic transfer of funds to the applicable tax or regulatory agencies (federal, state, and local). In connection with these services, we electronically collect payroll taxes from clients’ bank accounts, typically on payday, prepare and file the applicable tax returns, and remit taxes to the applicable tax or regulatory agencies on the respective due dates. These taxes are typically paid between one and 30 days after receipt of collections from clients, with some items extending to 90 days. We handle regulatory correspondence, amendments, and penalty and interest disputes.

· Employee payment services:    Our employee payment services provide an employer with the option of paying their employees by direct deposit, payroll debit card, a check drawn on a Paychex account (Readychex®), or a check drawn on the employer’s account and electronically signed by us. For each of the first three methods, we electronically collect net payroll from the clients’ bank accounts, typically one business day before payday, and provide payment to the employees on payday. Our Readychex service provides a cost-effective solution that offers the benefit of convenient, one-step payroll account reconciliation for employers.

3

· Regulatory compliance services:    We offer new-hire reporting services, which enable clients to comply with federal and state requirements to report information on newly hired employees. This information aids the government in enforcing child support orders and minimizes fraudulent unemployment and workers’ compensation insurance claims. Our garnishment processing service provides deductions from employees’ pay, forwards payments to third-party agencies, including those that require electronic payments, and tracks the obligations to fulfillment. These services enable employers to comply with legal requirements and reduce the risk of penalties.

Human Resource Services: We offer complementary services for outsourcing of various human resource functions to our payroll clients.  In addition, some of these services can be provided to clients who do not opt for payroll processing.  Our complementary services are categorized as follows:

· Paychex HR Services:    We offer comprehensive human resource outsourcing solutions that provide businesses a full-service approach to the outsourcing of employer and employee administrative needs. Our Paychex HR Services offering is available through Paychex HR Solutions, an administrative services organization (“ASO”), or Paychex PEO. Both options offer businesses a combined package of services that includes payroll, employer compliance, human resource and employee benefits administration, risk management outsourcing, and the on-site availability of a professionally trained human resource representative. These comprehensive bundles of services are designed to make it easier for businesses to manage their payroll and related benefit costs while providing a benefits package equal to that of larger companies. Our PEO differs from the ASO in that we serve as a co-employer of the clients’ employees, provide health care coverage to PEO employees, and assume the risks and rewards of workers’ compensation insurance and certain health insurance offerings. PEO services are sold through our registered and licensed subsidiary, Paychex Business Solutions, LLC. We also offer Paychex HR Essentials, which is an ASO product that provides support to our clients over the phone or online to help manage employee-related topics.  As of May 31, 2016, Paychex HR Services was utilized by approximately 35,000 clients with approximately 944,000 client worksite employees.

· Retirement services administration:    Our retirement services product line offers a variety of options to clients, including 401(k) plans, 401(k) SIMPLE plans, SIMPLE IRAs, 401(k) plans with safe harbor provisions, owner-only 401(k) plans, profit sharing plans, and money purchase plans. These services provide plan implementation, ongoing compliance with government regulations, employee and employer reporting, participant and employer online access, electronic funds transfer, and other administrative services. Auto enrollment is an optional plan feature that allows employers to automatically enroll employees in their company’s 401(k) plan and increase overall plan participation. Clients have the ability to choose from a group of pre-defined fund selections or to customize their investment options within their plan. We are the largest 401(k) recordkeeper for small businesses in the U.S. Our large-market retirement services clients include relationships with financial advisors.  As of May 31, 2016, retirement services covered approximately 74,000 plans and the asset value of participants' funds externally managed totaled approximately $23.6 billion.

· Insurance services:    Our licensed insurance agency, PIA, provides insurance through a variety of carriers. Insurance offerings include property and casualty coverage such as workers’ compensation, business-owner policies, commercial auto, and health and benefits coverage, including health, dental, vision, and life. Our insurance services simplify the insurance process to make it easy to find plans with the features and affordability to meet the client’s needs. With access to numerous top national and regional insurance carriers, our professional insurance agents have access to a wide selection of plans from which they can best match the insurance needs of small businesses. Additionally, clients have the option to integrate their insurance plans with Paychex payroll processing for easy, accurate plan administration.

We also offer new comprehensive solutions to help employers and employees with certain mandates under the AffordableCare Act (“ACA”), which sets forth specific coverage and reporting requirements that employers must meet.  Our Paychex Employer Shared Responsibility (“ESR”) Service is aimed at helping clients: 1) determine if the ESR provision applies to them; 2) provide ongoing ESR analysis and monitoring, along with automatic alerts, of their employees and hours worked; 3) evaluate if their health care offering meets the minimum coverage requirement; and 4) prepare end-of-year reporting.

PIA has a website, www.paychexinsurance.com, with information and interactive tools to help educate visitors on insurance and aid in making business insurance decisions.   A section on this website is designed to provide answers, information, and solutions that employers can use to prepare for and take action to comply with health care reform.

4

· HR administration services:    We offer cloud-based human resource administration software products for employee benefits management and administration, time and attendance solutions, and recruiting.  Paychex HR Online offers powerful tools for managing employee benefits, personnel information, and human resource compliance and reporting.  Our BeneTrac service manages the employee-benefit enrollment process.  Our time and attendance products, including our Stratustime® software acquired in June 2014, help minimize the time spent compiling time sheet information. These services allow the employer to handle multiple payroll scenarios, improving productivity, accuracy, and reliability in the payroll process.  Our expense reporting solution is a web-based solution that provides clients with tools to manage and control the expense reporting process.  The applicant tracking suite provides technology that streamlines, simplifies, and drives the applicant workflow and onboarding process for companies of all sizes.

· Other human resource services and products:    We offer the outsourcing of plan administration under section 125 of the Internal Revenue Code, allowing employees to use pre-tax dollars to pay for certain health insurance benefits and health and dependent care expenses not covered by insurance. All required implementation, administration, compliance, claims processing and reimbursement, and coverage tests are provided with these services. We offer state unemployment insurance services, which provide clients with prompt processing for all claims, appeals, determinations, change statements, and requests for separation documents. Other HRS products include employee handbooks, management manuals, and personnel and required regulatory forms. These products are designed to simplify clients’ office processes and enhance their employee benefits programs.

Accounting and Financial Services:  We offer various accounting and financial services to small- to medium-sized businesses.  These services offer additional value-added benefits for small-business owners including:purchasing of accounts receivable as a means of providing funding to clients in the temporary staffing industry; a cloud-based accounting service; payment processing services; payment distribution services; and a small-business loan resource center.

Sales and Marketing

We market and sell our services primarily through our direct sales force based in the metropolitan markets we serve.  Our direct sales force includes sales representatives who have defined geographical territories and specialize within our portfolio of services. Within payroll, we differentiate the markets we serve between small-business and mid-market companies.  Our sales representatives are also supported by marketing, advertising, public relations, trade shows, and telemarketing programs.  We utilize a virtual sales force to service geographical areas where we may not have a local presence or for products for which we do not have a local sales force.  We sell HRS products to both new clients and our existing client base.

In addition to our direct selling and marketing efforts, we utilize other indirect sales channels such as our relationships with existing clients, certified public accountants (“CPAs”), and banks for new client referrals.  Approximately 50% of our new core payroll clients (excluding business acquisitions) come from these referral sources.  Our dedicated business development group drives sales through banking, national associations, and franchise channels.

We have a long-standing partnership with the American Institute of Certified Public Accountants (“AICPA”) as the preferred payroll provider for its AICPA Business SolutionsTM Program.  More than half of the CPA firms in the U.S. are enrolled and actively participating in the Paychex Partner Program from AICPA Business Solutions.   Our current partnership agreement with the AICPA is in place through September 2021.  We also partner with various state CPA society organizations.

Our website, which is available at www.paychex.com, includes online payroll sales presentations and service and product information.  It also serves as a cost-efficient tool that serves as a source of leads and new sales, while complementing the efforts of our direct sales force. This online tool allows us to market to clients and prospective clients in other geographical areas where we do not have a direct sales presence. In addition, our insurance services website, which is available at www.paychexinsurance.com,  provides information to help small businesses navigate the insurance industry, and generates leads by allowing interested parties to get in contact with one of our professional insurance agents.

Paychex also builds on its reputation as an expert in the HCM industry by providing education and assistance to clients and other interested parties. We provide free webinars, white papers, and other information on our website to aid existing and prospective clients with the impacts of regulatory change. We track current regulatory issues that impact the small business community and provide a monthly regulatory update. Our  Paychex Accountant Knowledge Center is a free online resource available through our website that brings valuable information and time-saving online tools to accounting professionals.  The BuildMyBiz® website, which is available at www.BuildMyBiz.com, provides tools and resources for starting, growing, and managing a business.

5

Markets and Competition

We remain focused on servicing small- to medium-sized businesses based upon the growth potential that we believe exists in the markets we serve. Our internal database source indicates that there are approximately 11 million addressable businesses in the geographic markets that we currently serve within the U.S. Of those businesses, approximately 99% have fewer than 100 employees and comprise our primary customers and target market. The average client size within our existing client base is approximately 16.7 employees.  We believe that there is opportunity for us in the HCM market as the demand is moving down-market to smaller businesses.

We serve a diverse base of small- to medium-sized clients operating in a broad range of industries located throughout the U.S. and in Germany.  Revenue from operations in Germany and long-lived assets in Germany are not material. We also have a joint-venture arrangement to provide payroll and human resource services in Brazil. We utilize service agreements and arrangements with clients that are generally terminable by the client at any time or upon relatively short notice. For the fiscal year ended May 31, 2016 (“fiscal 2016”), client retention was in excess of 82% of our beginning of the year client base, consistent with the prior year’s record high. No single client has a material impact on total service revenue or results of operations.

The market for HCM services is highly competitive and fragmented. We have one primary national competitor and we also compete with other national, regional, local, and online service providers, all of which we believe have significantly fewer clients than us. In addition to traditional payroll processing and human resource service providers, we compete with in-house payroll and human resource systems and departments. Payroll and human resource systems and software are sold by many vendors. HRS products also compete with a variety of providers of human resource services, such as retirement services companies, insurance companies, and human resources and benefits consulting firms.

Competition in the payroll processing and human resource services industry is primarily based on service responsiveness, product quality and reputation, including ease of use and accessibility of technology, breadth of service and product offerings, and price. We believe we are competitive in each of these areas.  We believe that our excellent customer service, together with our leading-edge technology and mobility applications, distinguishes us from our competitors.

Software Maintenance and Development

The ever-changing mandates of Federal, state, and local tax and regulatory agencies require us to regularly update our proprietary software to provide payroll and human resource services to our clients. We are continually engaged in developing enhancements to and the maintenance of our various software platforms to meet the changing requirements of our clients and the marketplace. We continue to enhance our SaaS solutions and mobility applications to offer our users an integrated and unified experience.  Continued enhancement of the client and client employee experience is important to our future success.

Employees

As of May 31, 2016, we employed approximately 13,500 people.  None of our employees were covered by collective bargaining agreements.

Intellectual Property

We own or license and use a number of trademarks, trade names, copyrights, service marks, trade secrets, computer programs and software, and other intellectual property rights. Taken as a whole, our intellectual property rights are material to the conduct of our business. Where it is determined to be appropriate, we take measures to protect our intellectual property rights, including, but not limited to, confidentiality/non-disclosure agreements or policies with employees, vendors, and others; license agreements with licensees and licensors of intellectual property; and registration of certain trademarks. We believe that the “Paychex” name, trademark, and logo are of material importance to us.

Seasonality

There is no significant seasonality to our business. However, during our third fiscal quarter, which ends in February, the number of new payroll clients, new retirement services clients, and new Paychex HR Services worksite employees tends to be higher than during the rest of the fiscal year, primarily because many new clients prefer to start using our services at the beginning of a calendar year. In addition, calendar year-end transaction processing and client funds activity are traditionally higher during our third fiscal quarter due to clients paying year-end bonuses and requesting additional year-end services. Historically, as a result of these factors, our total revenue has been slightly higher in our third fiscal quarter, with greater sales commission expenses also reported in that quarter.

6

Available Information

We are subject to the informational and reporting requirements of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Therefore, we file periodic reports, proxy statements, and other information with the SEC. Such reports may be read and copied at the SEC’s Public Reference Room at 100 F Street NE, Washington, D.C. 20549. Information regarding the operation of the Public Reference Room may be obtained by calling the SEC at (800) SEC-0330. The SEC also maintains a website (www.sec.gov) that includes our reports, proxy statements, and other information.

Our corporate website, www.paychex.com, provides materials for investors and information about our services.  Our Form 10-Ks, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and other SEC filings, as well as any amendments to such reports and filings, are made available, free of charge, on our website as soon as reasonably practicable after such reports have been filed with or furnished to the SEC.  Also, copies of our Annual Report to Stockholders and Proxy Statement, to be issued in connection with our 2016 Annual Meeting of Stockholders, will be made available, free of charge, upon written request submitted to Paychex, Inc., c/o Corporate Secretary, 911 Panorama Trail South, Rochester, New York 14625-2396.

Item 1A.Risk Factors

Our future results of operations are subject to a number of risks and uncertainties. These risks and uncertainties could cause actual results to differ materially from historical and current results, and from our projections. The risk factors described below represent our current view of some of the most important risks facing our business and are important to understanding our business. The risks described below are not the only risks we face. Additional factors not presently known to us or that we currently deem to be immaterial also may adversely affect, possibly to a material extent, our business, cash flows, financial condition, or results of operations in future periods. In addition, you should refer to the description of forward-looking statements at the beginning of Part I of this Form 10-K.

Our services may be adversely impacted by changes in government regulations and policies:    Many of our services, particularly payroll tax administration services and employee benefit plan administration services, are designed according to government regulations that continually change. Changes in regulations could affect the extent and type of benefits employers are required, or may choose, to provide employees or the amount and type of taxes employers and employees are required to pay. Such changes could reduce or eliminate the need for some of our services and substantially decrease our revenue. Added requirements could also increase our cost of doing business. Failure to educate and assist our clients regarding new or revised legislation that impacts them could have an adverse impact on our reputation. Failure by us to modify our services in a timely fashion in response to regulatory changes could have a material adverse effect on our business and results of operations.

Our clients and our business could be adversely impacted by health care reform:    The ACA was enacted in March 2010 and entails sweeping health care reforms with staggered effective dates from 2010 through 2018. As a service provider, we have a responsibility to our clients to help them understand their increased obligations under the federal and state regulations facing employers under the ACA. Failure to provide clients with appropriate information or solutions to effectively manage their health care benefits and related costs could have an adverse impact on our reputation and a negative impact on our client base.  There is no guarantee that solutions we have developed to help clients navigate health care legislation will continue to be readily accepted by clients, which could have a material adverse impact on our insurance services business.  Insurance services revenue is at risk for lower commission revenue from underwriters if clients move away from traditional insurance policies utilized in the past or as a result of pressure on commission rates, driven by restrictions on insurers as to use of premiums.  Refer to the discussion later in this section on changes in health insurance and workers' compensation insurance rates and underlying claim trends for a  discussion of health care reform as it impacts our PEO.

We may not be able to keep pace with changes in technology or provide timely enhancements to our products and services:    To maintain our growth strategy, we must adapt and respond to technological advances and technological requirements of our clients. Our future success will depend on our ability to enhance capabilities and increase the performance of our internal systems, particularly our systems that meet our clients’ requirements. We continue to make significant investments related to the development of new technology. If our systems become outdated, we may be at a disadvantage when competing in our industry. There can be no assurance that our efforts to update and integrate systems will be successful. If we do not integrate and update our systems in a timely manner, or if our investments in technology fail to provide the expected results, there could be a material adverse effect to our business and results of operations.

7

Cyber-attacks and security vulnerabilities could lead to reduced revenues, increased costs, liability claims, or harm to our competitive position:  We rely upon information technology (“IT”) networks, cloud-based platforms, and systems to process, transmit, and store electronic information, and to support a variety of business processes.  Cyber-attacks and security threats are a risk to our business and reputation.  A privacy or IT security breach could have a material adverse effect on our business.

Data Security and Privacy Leaks:  We collect, use, and retain increasingly large amounts of personal information about our clients, employees of our clients, and our employees, including:  bank account numbers, credit card numbers, social security numbers, tax return information, health care information, retirement account information, payroll information, system and network passwords, and other sensitive personal and business information.  At the same time, the continued occurrence of high-profile data breaches provides evidence of an external environment increasingly hostile to information security.  Vulnerabilities, threats, and more sophisticated and targeted computer crimes pose a risk to the security of our systems and networks, and the confidentiality, availability, and integrity of our data.

Our service platforms enable our clients to store and process personal data on premise or, increasingly, in a cloud-based environment that we host.  The security of our IT infrastructure is an important consideration in our customers purchasing decisions.  As cyber threats continue to evolve, we are focused on ensuring that our operating environments safeguard and protect personal and business information.  While we have security systems and IT infrastructure in place designed to detect and protect against unauthorized access to such information, if our security measures are breached, our business could be substantially harmed and we could incur significant liabilities. Any such breach or unauthorized access could negatively affect our ability to attract new clients, cause existing clients to terminate their agreements with us, result in reputational damage and subject us to lawsuits, regulatory fines, or other actions or liabilities which could materially and adversely affect our business and operating results.  Third parties, including vendors that provide services for our operations, could also be a source of security risk to us in the event of a failure of their own security systems and infrastructure.

Data Loss and Business Interruption:  If our systems are disrupted or fail for any reason, or if our systems are infiltrated by unauthorized persons, both the Company and our clients could experience data loss, financial loss, harm to reputation, or significant business interruption. We may be required to incur significant costs to protect against damage caused by disruptions or security breaches in the future. Such events may expose us to unexpected liability, litigation, regulatory investigation and penalties, loss of clients’ business, unfavorable impact to business reputation, and there could be a material adverse effect on our business and results of operations.

In the event of a catastrophe, our business continuity plan may fail, which could result in the loss of client data and adversely interrupt operations:    Our operations are dependent on our ability to protect our infrastructure against damage from catastrophe or natural disaster, severe weather including events resulting from climate change, unauthorized security breach, power loss, telecommunications failure, terrorist attack, or other events that could have a significant disruptive effect on our operations. We have a business continuity plan in place in the event of system failure due to any of these events. Our business continuity plan has been tested in the past by circumstances of severe weather, including hurricanes, floods, and snowstorms, and has been successful. However, these past successes are not an indicator of success in the future. If the business continuity plan is unsuccessful in a disaster recovery scenario, we could potentially lose client data or experience material adverse interruptions to our operations or delivery of services to our clients.

We may be adversely impacted by any failure of third-party service providers to perform their functions:    As part of providing services to clients, we rely on a number of third-party service providers. These service providers include, but are not limited to, couriers used to deliver client payroll checks and banks used to electronically transfer funds from clients to their employees. Failure by these service providers, for any reason, to deliver their services in a timely manner could result in material interruptions to our operations, impact client relations, and result in significant penalties or liabilities to us.

We may be exposed to additional risks related to our co-employment relationship within our PEO business:    Many federal and state laws that apply to the employer-employee relationship do not specifically address the obligations and responsibilities of the “co-employment” relationship. As a result, there is a possibility that we may be subject to liability for violations of employment or discrimination laws by our clients and acts or omissions of client employees, who may be deemed to be our agents, even if we do not participate in any such acts or violations. Although our agreements with clients provide that they will indemnify us for any liability attributable to their own or their employees’ conduct, we may not be able to effectively enforce or collect such contractual obligations. In addition, we could be subject to liabilities with respect to our employee benefit plans if it were determined that we are not the “employer” under any applicable state or federal laws.

8

We may be adversely impacted by changes in health insurance and workers’ compensation rates and underlying claims trends:    Within our PEO business, we maintain health and workers’ compensation insurance covering worksite employees. The insurance costs are impacted by claim experience and are a significant portion of our PEO costs. If we experience a sudden or unexpected increase in claim activity, our costs could increase. In addition, in the event of expiration or cancellation of existing contracts, we may not be able to secure replacement contracts on competitive terms. Also, as a co-employer in the PEO, we assume or share many of the employer-related responsibilities associated with health care reform, which may result in increased costs.  Increases in costs not incorporated into service fees timely or fully could have a material adverse effect on our results of operations. Incorporating cost increases into service fees could also impact our ability to attract and retain clients.

Our interest earned on funds held for clients may be impacted by changes in government regulations mandating the amount of tax withheld or timing of remittance:    We receive interest income from investing client funds collected but not yet remitted to applicable tax or regulatory agencies or to client employees. A change in regulations either decreasing the amount of taxes to be withheld or allowing less time to remit taxes to applicable tax or regulatory agencies could adversely impact interest income.

We may be adversely impacted by volatility in the financial and economic environment:    During periods of weak economic conditions, employment levels tend to decrease and interest rates may become more volatile. These conditions may impact our business due to lower transaction volumes or an increase in the number of clients going out of business. Current or potential clients may decide to reduce their spending on payroll and other outsourcing services. In addition, new business formation may be affected by an inability to obtain credit. The interest we earn on funds held for clients may decrease as a result of a decline in funds available to invest and lower interest rates. In addition, during periods of volatility in the credit markets, certain types of investments may not be available to us or may become too risky for us to invest in, further reducing the interest we may earn on client funds.

Constriction in the credit markets may impact the availability of financing, even to borrowers with the highest credit ratings. Historically, we have periodically borrowed against available credit arrangements to meet short-term liquidity needs. However, should we require additional short-term liquidity during days of large outflows of client funds, a credit constriction may limit our ability to access those funds or the flexibility to obtain them at interest rates that would be acceptable to us. Growth in services for funding payrolls of our clients in the temporary staffing industry may be constricted if access to financing becomes limited.  If all of these financial and economic circumstances were to remain in effect for an extended period of time, there could be a material adverse effect on our results of operations and financial condition.

We may not be able to attract and retain qualified people, which could impact the quality of our services and customer satisfaction.  Our success, growth and financial results depend in part on our continuing ability to attract, retain and motivate highly qualified people at all levels, including management, technical, compliance and sales personnel.  Competition for these individuals can be intense, and we may not be able to retain our key people, or attract, assimilate or retain other highly-qualified individuals in the future, which could harm our future success.

Quantitative and qualitative disclosures about market risk:    Refer to Item 7A of this Form 10-K for a discussion on Market Risk Factors, which could have a material adverse effect on our business and results of operations.

Item 1B.Unresolved Staff Comments

None.

9

Item 2.Properties

We owned and leased the following properties as of May 31, 2016:

	Square feet
Owned facilities:
Rochester, New York	721,000
Other U.S. locations	65,000
Total owned facilities	786,000
Leased facilities:
Rochester, New York	231,000
Other U.S. locations	1,889,000
International locations	35,000
Total leased facilities	2,155,000

Our facilities in Rochester, New York house various distribution, processing, and technology functions, certain ancillary functions, a telemarketing unit, and other back-office functions. Facilities outside of Rochester, New York are at various locations throughout the U.S. and house our regional, branch, and sales offices and data processing centers. These locations are concentrated in metropolitan areas. Our international locations are primarily in Germany and house our German branch and sales locations. We believe that adequate, suitable lease space will continue to be available to meet our needs.

Item 3.Legal Proceedings

We are subject to various claims and legal matters that arise in the normal course of our business. These include disputes or potential disputes related to breach of contract, tort, breach of fiduciary duty, employment-related claims, tax claims, and other matters.

Our management currently believes that resolution of outstanding legal matters will not have a material adverse effect on our financial position or results of operations. However, legal matters are subject to inherent uncertainties and there exists the possibility that the ultimate resolution of these matters could have a material adverse impact on the Company’s financial position and the results of operations in the period in which any such effect is recorded.

Item 4.Mine Safety Disclosures

Not applicable.

10

PART II

Item 5.Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Our common stock trades on the NASDAQ Global Select Market under the symbol “PAYX.” Dividends have historically been paid on our common stock in August, November, February, and May. The level and continuation of future dividends are dependent on our future earnings and cash flows, and are subject to the discretion of our Board of Directors (the “Board.”)

As of June 30, 2016, there were 12,548 holders of record of our common stock, which includes registered holders and participants in the Paychex, Inc. Dividend Reinvestment and Stock Purchase Plan. There were also 5,813 participants in the Paychex, Inc. Employee Stock Purchase Plan and 4,841 participants in the Paychex, Inc. Employee Stock Ownership Plan.

The high and low sale prices for our common stock as reported on the NASDAQ Global Select Market and dividends for fiscal 2016 and the fiscal year ended May 31, 2015  (“fiscal 2015”) are as follows:

	Fiscal 2016			Fiscal 2015
			Cash			Cash
			dividends			dividends
	Sales prices		declared	Sales prices		declared
	High	Low	per share	High	Low	per share
First quarter	$49.79	$41.59	$0.42	$42.66	$40.10	$0.38
Second quarter	$54.54	$43.19	$0.42	$48.20	$41.59	$0.38
Third quarter	$54.78	$45.76	$0.42	$50.19	$44.52	$0.38
Fourth quarter	$54.58	$51.06	$0.42	$51.72	$48.00	$0.38

The closing price of our common stock as of May 31, 2016, as reported on the NASDAQ Global Select Market, was $54.22 per share.

In May 2014, the Board approved a program to repurchase up to $350 million of our common stock with authorization expiring on May 31, 2017.  Shares repurchased under this program during fiscal 2016 and fiscal 2015 were as follows:

	Fiscal 2016			Fiscal 2015
In millions	Total number of shares purchased	Total dollars		Total number of shares purchased		Total dollars
First quarter	1.3	$	62.9		0.9	$	37.5
Second quarter	—		—		0.3		15.1
Third quarter	0.9		45.0		0.4		17.9
Fourth quarter	—		—		2.3		111.9
Fiscal year	2.2	$	107.9		3.9	$	182.4

As of May 31, 2016, the approximate dollar value of shares that may yet be purchased under the program is $59.7 million.  Shares of stock repurchased during fiscal 2016and fiscal 2015 were purchased pursuant to the program and were retired. 

11

The following graph shows a five-year comparison of the total cumulative returns of investing $100 on May 31, 2011, in Paychex common stock, the S&P 500 Index, and a Peer Group Index. All comparisons of stock price performance shown assume reinvestment of dividends. We are a participant in the S&P 500 Index, a market group of companies with a larger than average market capitalization. Our Peer Group is a group of companies with comparable revenue and net income, who are in a comparable industry, or who are direct competitors of Paychex (as detailed below).

May 31,	2011	2012	2013	2014	2015	2016
Paychex	$100.00	$96.81	$125.11	$142.92	$177.59	$201.67
S&P 500	$100.00	$99.59	$126.75	$152.67	$170.69	$173.25
Peer Group	$100.00	$94.61	$125.45	$155.83	$200.87	$208.71

There can be no assurance that our stock performance will continue into the future with the same or similar trends depicted in the graph above. We will neither make nor endorse any predictions as to future stock performance.

Our Peer Group for fiscal 2016 is comprised of the following companies:

Automatic Data Processing, Inc. (direct competitor)	Broadridge Financial Solutions, Inc.
Fiserv, Inc.	Robert Half International Inc.
The Western Union Company	Intuit Inc.
Total Systems Services, Inc.	Iron Mountain Incorporated
Global Payments Inc.	Moody’s Corporation
The Brink’s Company	H&R Block, Inc.
DST System, Inc.	TD AMERITRADE Holding Corporation
The Dun & Bradstreet Corporation

12

Item 6.Selected Financial Data

In millions, except per share amounts
Year ended May 31,	2016 (1)			2015			2014 (2),  (4)			2013 (3),  (4)			2012 (4)
Service revenue	$	2,905.8		$	2,697.5		$	2,478.2		$	2,285.2		$	2,186.2
Interest on funds held for clients	$	46.1		$	42.1		$	40.7		$	41.0		$	43.6
Total revenue	$	2,951.9		$	2,739.6		$	2,518.9		$	2,326.2		$	2,229.8
Operating income	$	1,146.6		$	1,053.6		$	982.7		$	904.8		$	853.9
Net income	$	756.8		$	674.9		$	627.5		$	569.0		$	548.0
Basic earnings per share	$	2.10		$	1.86		$	1.72		$	1.56		$	1.51
Diluted earnings per share	$	2.09		$	1.85		$	1.71		$	1.56		$	1.51
Cash dividends per common share	$	1.68		$	1.52		$	1.40		$	1.31		$	1.27
Purchases of property and equipment	$	97.7		$	102.8		$	84.1		$	98.7		$	89.6
Cash and total corporate investments	$	793.2		$	936.4		$	936.8		$	874.6		$	790.0
Total assets	$	6,440.8		$	6,467.5		$	6,321.0		$	6,127.3		$	6,448.8
Total debt	$	—		$	—		$	—		$	—		$	—
Stockholders’ equity	$	1,911.7		$	1,785.5		$	1,777.0		$	1,773.7		$	1,604.5
Return on stockholders’ equity		40	%		36	%		35	%		34	%		34	%

(1) In the first quarter of fiscal 2016,  a net tax benefit was recorded for income derived in prior tax years from customer-facing software we produced.  This increased full-year diluted earnings per share by approximately $0.05 per share.

(2) With the introduction of a new health care offering within the PEO during the fiscal year ended May 31, 2014, the Company began to recognize certain PEO direct costs as operating expenses rather than as a reduction in service revenue.  In the table above, this impacted service revenue and total revenue, but had no impact on operating income.

(3) In the fourth quarter of the fiscal year ended May 31, 2013, the Company increased its tax provision related to the settlement of a state income tax matter.  This reduced diluted earnings per share by approximately $0.04 per share.

(4) With the adoption of Financial Accounting Standards Board Accounting Standards Update No. 2015-17 “Income Taxes (Topic 740) - Balance Sheet Classification of Deferred Taxes” during fiscal 2016, the reclassification of prior year deferred tax amounts was made on the Consolidated Balance Sheets to conform to the current period presentation.  In the table above, a similar reclassification was made, which impacted total assets.  Refer to Note A of the Notes to Consolidated Financial Statements contained in Item 8 of this Form 10-K for further details on this recently adopted accounting pronouncement.

Item 7.Management’s Discussion and Analysis of Financial Condition and Results of Operations

Management’s Discussion and Analysis of Financial Condition and Results of Operations reviews the operating results of Paychex, Inc. and its wholly owned subsidiaries (“Paychex,” “we,” “our,” or “us”) for each of the three fiscal years ended May 31, 2016 (“fiscal 2016”),  May 31, 2015 (“fiscal 2015”), and May 31, 2014 (“fiscal 2014”), and our financial condition as of May 31, 2016. This review should be read in conjunction with the accompanying consolidated financial statements and the related notes to consolidated financial statements contained in Item 8 of this Annual Report on Form 10-K (“Form 10-K”) and the “Risk Factors” discussed in Item 1A of this Form 10-K. Forward-looking statements in this review are qualified by the cautionary statement under the heading “Cautionary Note Regarding Forward-Looking Statements Pursuant to the United States Private Securities Litigation Reform Act of 1995” contained at the beginning of Part I of this Form 10-K.

Overview

We are a leading provider of integrated human capital management (“HCM”) solutions for payroll, human resource (‘HR”),  retirement, and insurance services for small- to medium-sized businesses.  We offer a comprehensive portfolio of HCM services and products that allow our clients to meet their diverse payroll and human resource needs. Our payroll processing services, the foundation of our service model, include:

· payroll processing;

· payroll tax administration services;

· employee payment services; and

13

· regulatory compliance services (new-hire reporting and garnishment processing).

We support small-business companies through our core payroll, utilizing our robust Paychex FlexSM platform, and our software-as-a-service (“SaaS”) SurePayroll® products.  Mid-market companies typically have more sophisticated payroll and benefits needs, and are primarily serviced through our Paychex Flex Enterprise solution set, which offers an integrated suite of HCM solutions through the Paychex Flex platform, or through our traditional mid-market platform. Our SaaS solution through Paychex Flex Enterprise integrates payroll processing with human resource management, employee benefits administration, time and labor management, and applicant tracking and onboarding solutions.

We offer a suite of complementary Human Resource Services (“HRS”) products including:

· comprehensive human resource outsourcing through Paychex HR Services, under which we offer Paychex HR Solutions, our administrative services organization (“ASO”), and Paychex PEO, our professional employer organization (“PEO”);

· retirement services administration;

· insurance services;

· HR administration services, including time and attendance, benefit enrollment, recruiting, and onboarding; and

· other human resource services and products.

We also offer certain accounting and financial services, which include: the purchase of accounts receivable as a means of providing payroll funding to clients in the temporary staffing industry; a cloud-based accounting service; payment processing services; payment distribution services; and a small-business loan resource center.

Our mission is to be the leading provider of payroll, HR, and employee benefits services for small- and mid-sized companies by being an essential partner with America's businesses.  We believe success in this mission will lead to strong long-term financial performance.  Our strategy focuses on flexible, convenient service; industry-leading, integrated technology; solid sales execution; providing a comprehensive suite of value-added HCM services; continued service penetration; and engaging in strategic acquisitions.

We continue to focus on driving growth in the number of clients, revenue, and profits, while providing industry-leading service and technology solutions to our clients and their employees. We are managing our personnel costs and expenses while continuing to invest in our business, particularly in leading-edge technology. We believe these investments are critical to our success. Looking to the future, we believe that investing in our products, people, and service capabilities will position us to capitalize on opportunities for long-term growth.

Our financial results for fiscal 2016 reflected sustained growth in our business.  Payroll service revenue continued to experience steady growth of 4% for fiscal 2016 as compared with fiscal 2015, driven by growth in client base and revenue per check.  Our payroll client base grew 2% in fiscal 2016 to approximately 605,000 clients as of May 31, 2016, resulting from solid sales execution and client retention results in excess of 82% of the beginning of the fiscal year client base, consistent with the prior year’s record high. 

Our financial results continue to be impacted by the interest rate environment as interest rates available on high-quality financial instruments remain low.  Our combined funds held for clients and corporate investment portfolios earned an average rate of return of 1.1% for fiscal 2016, compared to 1.0% for fiscal years 2015 and 2014.  In December 2015, the United States (“U.S.”) Federal Reserve raised the Federal Funds rate by 25 basis points.  This was the first interest hike in nearly a decade.  The Federal Funds rate was in the range of 0.25% to 0.50% as of May 31, 2016, and was in the range of zero to 0.25% as of May 31, 2015.  

Highlights of our financial results for fiscal 2016, compared to fiscal 2015, are as follows:

· Totalrevenue increased 8% to $3.0 billion.

· Total service revenue increased 8% to $2.9 billion.

o Payroll service revenue increased 4% to $1.7 billion.

o HRS revenue increased 13% to $1.2 billion.

· Interest on funds held for clients increased 9% to $46.1 million.

· Operatingincome increased 9% to $1.1 billion.

14

· Net income increased 12% to $756.8 million and diluted earnings per share increased 13% to $2.09 per share.  During the first quarter of fiscal 2016 (the “first quarter”), a net tax benefit was recorded for income derived in prior tax years that increased full-year diluted earnings per share by approximately $0.05.  Excluding this net tax benefit, net income and diluted earnings per share would have increased 9% and 10%, respectively, for fiscal 2016.

· Dividends of $606.5 million were paid to stockholders, representing 80% of net income.

Business Outlook

Our payroll client base totaled approximately 605,000clients as of May 31, 2016, compared to approximately 590,000 clients as of May 31, 2015, and approximately 580,000 clients as of May 31, 2014. Our payroll client base increased approximately 2% for each of the fiscal years2016, 2015 and 2014.

While HRS provides services to employers and employees beyond payroll, they effectively leverage payroll processing data and, therefore, are beneficial to our operating margin.  Our HR administration services are often included as part of the SaaS solutions for mid-market clients.  The following table illustrates the growth in selected HRS service offerings:

	Balance at	Growth rates for fiscal year
	May 31, 2016	2016		2015		2014
Paychex HR Services client worksite employees	944,000	10	%	12	%	14	%
Paychex HR Services clients	35,000	10	%	11	%	13	%
Health and benefits services applicants	150,000	6	%	6	%	3	%
Retirement services plans	74,000	7	%	6	%	5	%

In fiscal 2016, we made significant enhancements to our Paychex Flex platform,  which is our cloud-based HCM solution.  In fiscal 2016, we completed the integration of key HCM modules with the release of Paychex Flex Time, Paychex Flex Benefits Administration, and Paychex Flex Hiring.  We believe this leading-edge technology, along with our flexible service options, positively impacted our performance in the mid-market space, as we experienced especially strong sales results for this division in fiscal 2016.

In December 2015, a wholly owned subsidiary of Paychex acquired substantially all of the net assets of Advance Partners.  Advance Partners is a leading provider of integrated financial, operational, and strategic services to support independent staffing firms.  Advance Partners offers customizable solutions to the temporary staffing industry, including payroll funding and outsourcing services. 

Our full-service Paychex Employer Shared Responsibility (“ESR”) services continued to show strong market acceptance and growth in fiscal 2016. The Affordable Care Act (“ACA”) sets forth specific coverage and reporting requirements that employers must meet. Paychex ESR services help clients navigate the complexities of those requirements, avoid steep fines and penalties, and reduce ACA-related administrative work.

We continue to strengthen our position as an expert in our industry by serving as a source of education and information to clients, small businesses, and other interested parties.  We provide free webinars, white papers, and other information on our website to aid existing and prospective clients with the impact of regulatory changes.  The Paychex Insurance Agency, Inc. website, www.paychexinsurance.com, helps small-business owners navigate the area of insurance coverage.  Both this website and www.paychex.com have sections dedicated to the topic of health care reform.

Financial position and liquidity

Our financial position as of May 31, 2016 remained strong with cash and total corporate investments of $793.2 million and no debt. Our investment strategy continues to focus on protecting principal and optimizing liquidity. Yields on high quality financial instruments remain low, negatively impacting our income earned on funds held for clients and corporate investments. We invest predominately in municipal bonds -  including general obligation bonds; pre-refunded bonds,which are secured by a U.S. government escrow; and essential services revenue bonds – along with U.S. government agency securities and corporate bonds. During fiscal 2016, our primary short-term investment vehicles were bank demand deposit accounts, variable rate demand notes (“VRDNs”),high-quality commercial paper, andgovernment agency discount notes.

15

A substantial portion of our portfolio is invested in high credit quality securities with ratings of AA or higher, and A-1/P-1 ratings on short-term securities. We limit the amounts that can be invested in any single issuer and invest in short- to intermediate-term instruments whose fair value is less sensitive to interest rate changes. We believe that our investments as of May 31, 2016 were not other-than-temporarily impaired, nor has any event occurred subsequent to that date that would indicate any other-than-temporary impairment.

Our primary source of cash is our ongoing operations. Cash flow from operations exceeded $1.0 billion for the first time for fiscal 2016. Historically, we have funded our operations, capital purchases, business acquisitions, share repurchases, and dividend payments from our operating activities. Our positive operating cash flows for fiscal 2016 allowed us to support our business growth and to pay substantial dividends to our stockholders. In July 2015, we announced an increase in our quarterly dividend of 11%, or $0.04 per share.  In July 2016, we subsequently announced an additional $0.04 per share, or 10%, increase in our quarterly dividend.  Dividends paid to stockholders were 80% of net income in fiscal 2016. It is anticipated that cash and total corporate investments as of May 31, 2016, along with projected operating cash flows, will support our normal business operations, capital purchases, share repurchases, dividend payments, and business acquisitions, if any, for the foreseeable future.

For further analysis of our results of operations for fiscal years 2016,  2015, and 2014, and our financial position as of May 31, 2016, refer to the tables and analysis in the “Results of Operations” and “Liquidity and Capital Resources” sections of this Item 7 and the discussion in the “Critical Accounting Policies” section of this Item 7.

Outlook

Our outlook for the fiscal year ending May 31, 2017 (“fiscal 2017”) is based upon current market, economic, and interest rate conditions continuing with no significant changes. Our expected full-year fiscal 2017 payroll revenue growth rate is based upon anticipated client base growth and increases in revenue per check.  Our guidance for fiscal 2017 is as follows:

· Payroll service revenue is anticipated to increase approximately 4%;

· HRS Revenue is anticipated to increase in the range of 12% to 14%;

· total service revenue is expected to increase in the range of 7% to 8%;

· interest on funds held for clients is expected to reflect mid-single-digit growth;

· net income is expected to increase approximately 8%, excluding the net tax benefit recognized in fiscal 2016 related to income derived in prior tax years;

· operating income, net of certain items, as a percent of service revenue is expected to approximate 38%; and

· the effective income tax rate for fiscal 2017 is expected to be in the range of 35.5% to 36%.

The average rate of return on our combined funds held for clients and corporate investment portfolios is expected to be approximately 1.1% for fiscal 2017. As of May 31, 2016, the long-term investment portfolio had an average yield-to-maturity of 1.7% and an average duration of 3.1 years.

Purchases of property and equipment for fiscal 2017 are expected to be in the range of $110 million to $120 million. This includes costs for internally developed software as we continue to invest in our service supporting technology. Fiscal 2017 depreciation expense is projected to be in the range of $100 million to $110 million, and we project amortization of intangible assets for fiscal 2017 to be in the range of $15 million to $20 million.

16

Results of Operations

Summary of Results of Operations for the Fiscal Years Ended May 31:

In millions, except per share amounts	2016			Change		2015			Change		2014
Revenue:
Payroll service revenue	$	1,729.9		4	%	$	1,656.8		4	%	$	1,599.3
HRS revenue		1,175.9		13	%		1,040.7		18	%		878.9
Total service revenue		2,905.8		8	%		2,697.5		9	%		2,478.2
Interest on funds held for clients		46.1		9	%		42.1		3	%		40.7
Total revenue		2,951.9		8	%		2,739.6		9	%		2,518.9
Combined operating and SG&A expenses		1,805.3		7	%		1,686.0		10	%		1,536.2
Operating income		1,146.6		9	%		1,053.6		7	%		982.7
Investment income, net		4.5		(28)	%		6.4		17	%		5.4
Income before income taxes		1,151.1		9	%		1,060.0		7	%		988.1
Income taxes		394.3		2	%		385.1		7	%		360.6
Effective income tax rate		34.3	%				36.3	%				36.5	%
Net income	$	756.8		12	%	$	674.9		8	%	$	627.5
Diluted earnings per share	$	2.09		13	%	$	1.85		8	%	$	1.71

We invest in highly liquid, investment-grade fixed income securities and do not utilize derivative instruments to manage interest rate risk. As of May 31, 2016, we had no exposure to high-risk or illiquid investments. Details regarding our combined funds held for clients and corporate investment portfolios are as follows:

	Year ended May 31,
$ in millions	2016			2015			2014
Average investment balances:
Funds held for clients	$	4,105.5		$	4,080.0		$	3,968.7
Corporate investments		922.6			1,011.5			973.8
Total	$	5,028.1		$	5,091.5		$	4,942.5
Average interest rates earned (exclusive of net realized gains):
Funds held for clients		1.1	%		1.0	%		1.0	%
Corporate investments		0.9	%		0.7	%		0.7	%
Combined funds held for clients and corporate investments		1.1	%		1.0	%		1.0	%
Total net realized gains	$	0.1		$	0.3		$	0.6

$ in millions
As of May 31,	2016			2015			2014
Net unrealized gains on available-for-sale securities(1)	$	47.6		$	13.6		$	34.5
Federal Funds rate(2)		0.50	%		0.25	%		0.25	%
Total fair value of available-for-sale securities	$	4,141.9		$	3,595.6		$	3,391.4
Weighted-average duration of available-for-sale securities in years(3)		3.1			3.2			3.0
Weighted-average yield-to-maturity of available-for-sale securities(3)		1.7	%		1.6	%		1.6	%

(1) The net unrealized gain on our investment portfolios was approximately $63.5 million as of July 15, 2016.

(2) The Federal Funds rate was in the range of 0.25% to 0.50% as of May 31, 2016, and in the range of zero to 0.25% as of May 31, 2015.

(3) These items exclude the impact of VRDNs, as they are tied to short-term interest rates.

17

Payroll service revenue:  Payroll service revenue was $1.7 billion for both fiscal 2016 and fiscal 2015, reflecting growth of 4% for both fiscal 2016 and fiscal 2015 compared to fiscal 2014.  Both fiscal 2016 and fiscal 2015 benefited from increases in client base and revenue per check.   Revenue per check improved as a result of price increases, net of discounts.  Fiscal 2016 also benefited from two additional processing days during the year.

For fiscal 2016 and fiscal 2015, our total payroll client base growth was approximately 2%.  Client retention was in excess of 82% of the beginning of the year client base for fiscal 2016, consistent with fiscal 2015, which reflected a record high.

Human Resource Services revenue:  HRS revenue was $1.2 billion for fiscal 2016 and $1.0billion for fiscal 2015, reflecting growth of 13%  and 18%, respectively, compared to each of the prior fiscal year periods.

For both fiscal 2016 and fiscal 2015,  HRS revenue growth was primarily driven by increases in client base across all major HCM services, including: comprehensive outsourcing services; retirement services; time and attendance; and HR. HRS product key statistics are as follows:

$ in billions
As of May 31,	2016		Change		2015		Change		2014
Paychex HR Services client worksite employees		944,000	10	%		858,000	12	%		766,000
Paychex HR Services clients		35,000	10	%		31,000	11	%		28,000
Health and benefits services applicants		150,000	6	%		142,000	6	%		134,000
Retirement services plans		74,000	7	%		70,000	6	%		66,000
Asset value of retirement services participants’ funds	$	23.6	—	%	$	23.5	7	%	$	21.9

We continue to experience strong demand for our Paychex HR Services, our largest HRS revenue stream, as evidenced by the continued double-digit growth in client worksite employees.  During both fiscal 2016 and fiscal 2015, the PEO, in particular, experienced strong demand.

Retirement services revenue growth was tempered in fiscal 2016 by a lower average asset value of participants’ funds, offset somewhat by higher basis points earned from external fund managers.  Retirement services revenue for fiscal 2015 compared to fiscal 2014 benefited from pricing and higher average asset value of participants’ funds.

Insurance services revenue growth for both fiscal 2016 and 2015 benefited from growth in our full-service ACA product.  In addition, higher average premiums and clients in our workers’ compensation product positively impacted revenue in both years.

Our HR administration products, including time and attendance and HR management, contributed to growth through strong sales of our SaaS solutions.  Time and attendance solutions benefited from a small business acquisition in fiscal 2015.

Total service revenue:  Total service revenue increased 8% for fiscal 2016 and 9% for fiscal 2015, attributable to the factors previously discussed.

Interest on funds held for clients:  Interest on funds held for clients increased 9% for fiscal 2016andincreased3% for fiscal 2015.  For fiscal 2016, the increase was primarily due to higher average interest rates and slightly higher average investment balances.  For fiscal 2015, the increase was primarily due to an increase in average investment balances, while average interest rates earned were flat. 

Average investment balances for funds held for clients increased 1% for fiscal 2016  and 3% for fiscal 2015.  The net increase in average investment balances for fiscal 2016 was mainly due to client base growth and wage inflation, partially offset by lower state unemployment insurance rates.  The increase in average investment balances for fiscal 2015 was mainly driven by increases in client base and wage inflation.   

Refer to the “Market Risk Factors” section contained in Item 7A of this Form 10-K for more information on changing interest rates.

18

Combined operating and SG&A expenses:  The following table summarizes total combined operating and SG&A expenses for fiscal years:

In millions	2016		Change		2015		Change		2014
Compensation-related expenses	$	1,148.2	6	%	$	1,087.1	8	%	$	1,003.9
Depreciation and amortization		115.1	8	%		106.6	2	%		105.0
Other expenses		542.0	10	%		492.3	15	%		427.3
Total expenses	$	1,805.3	7	%	$	1,686.0	10	%	$	1,536.2

Total expenses increased 7% for fiscal 2016 and 10% for fiscal 2015. Fiscal 2015 was impacted by costs relating to the new minimum premium plan health insurance offering within our PEO, introduced in January 2014, which contributed three percentage points of the increase in total expenses for fiscal 2015.

The increases in total expenses were driven largely by growth in compensation-related expenses.  For fiscal 2016, compensation-related expenses increased due to higher wages and performance-based compensation costs. For fiscal 2015, compensation-related expenses increased due to higher sales headcount and variable costs resulting from strong sales execution, along with higher employee-benefit-related costs, primarily medical expenses.  As of May 31, 2016, we had approximately 13,500 employees, compared with 13,000 employees as of May 31, 2015.

Depreciation expense is primarily related to buildings, furniture and fixtures, data processing equipment, and software. Amortization of intangible assets is primarily related to client list acquisitions, which are amortized using either straight-line or accelerated methods.  The higher growth rate for depreciation and amortization in fiscal 2016 was primarily driven by higher depreciation related to an increase in internally developed software that was placed in service.

Other expenses include items such as non-capital equipment, delivery, forms and supplies, communications, travel and entertainment, professional services, and other costs incurred to support our business.  Other expenses increased due to growth within the PEO.  In addition, continued investment in product development and supporting technology impacted other expense growth for both fiscal 2016 and fiscal 2015.

Operating income:  Operating income increased 9% for fiscal 2016 and 7% for fiscal 2015. The fluctuations in operating income were attributable to the factors previously discussed.

Operating income, net of certain items, is as follows for fiscal years:

In millions	2016		Change		2015		Change		2014
Operating income	$	1,146.6	9	%	$	1,053.6	7	%	$	982.7
Excluding:  Interest on funds held for clients		(46.1)	9	%		(42.1)	3	%		(40.7)
Operating income, net of certain items (1)	$	1,100.5	9	%	$	1,011.5	7	%	$	942.0

(1) Operating income, net of certain items is a non-GAAP measure.  Refer to the “Non-GAAP Financial Measure” discussion that follows.

Operating income, net of certain items, as a percentage of service revenue was approximately 38% for each of the fiscal years 2016, 2015 and 2014. 

Non-GAAP Financial Measure:  In addition to reporting operating income, a U.S. generally accepted accounting principle (“GAAP”) measure, we present operating income, net of certain items, which is a non-GAAP measure. We believe operating income, net of certain items, is an appropriate additional measure, as it is an indicator of our core business operations performance period over period. It is also the basis of the measure used internally for establishing the following year’s targets and measuring management’s performance in connection with certain performance-based compensation payments and awards. Operating income, net of certain items, excludes interest on funds held for clients. Interest on funds held for clients is an adjustment to operating income due to the volatility of interest rates, which are not within the control of management. Operating income, net of certain items, is not calculated through the application of GAAP and is not the required form of disclosure by the Securities and Exchange Commission (“SEC”). As such, it should not be considered as a substitute for the GAAP measure of operating income and, therefore, should not be used in isolation, but in conjunction with the GAAP measure. The use of any non-GAAP measure may produce results that vary from the GAAP measure and may not be comparable to a similarly defined non-GAAP measure used by other companies.

19

Investment income, net:  Investment income, net, primarily represents earnings from our cash and cash equivalents and investments in available-for-sale securities. Investment income does not include interest on funds held for clients, which is included in total revenue. Investment income, net, decreased 28% for fiscal 2016 as the result of immaterial losses on equity method investments and a decrease in average investment balances, partially offset by higheraverage interest rates earned.  The decrease in average investment balances for fiscal 2016 is the result of cash consideration paid for the acquisition of Advance Partners in December 2015 and stock repurchase activity.Investment income increased 17% for fiscal 2015 due to an increase in average investment balances resulting from investment of cash generated from operations, while interest rates earned remained relatively flat. 

Income taxes:  Our effective income tax rate was 34.3% for fiscal 2016 compared to 36.3% for fiscal 2015 and 36.5% for fiscal 2014. The decrease in the effective income tax rate for fiscal 2016 is related primarily to a net tax benefit that was recorded for income derived in prior tax years from customer-facing software we produced. During the first quarter, we engaged tax specialists to assess the qualification of such software for the Federal “Qualified Production Activities Deduction.”  Based on this assessment, we concluded that certain of our software offerings qualified for this tax deduction in prior tax years and, therefore, we recorded the tax benefits and related tax reserves as a discrete item in the first quarter.  Excluding this net tax benefit, the effective income tax rate would have been approximately 35.8% for fiscal 2016.  Refer to Note J of the Notes to Consolidated Financial Statements contained in Item 8 of this Form 10-K for additional disclosures on income taxes.

Net income and earnings per share:  Net income increased 12% to $756.8 million for fiscal 2016 and 8% to $674.9 million for fiscal 2015. Diluted earnings per share increased 13% to $2.09 per share for fiscal 2016 and 8% to $1.85 per share for fiscal 2015. These fluctuations were attributable to the factors previously discussed.Excluding the net tax benefit recognized in the first quarter, net income and diluted earnings per share for fiscal 2016 would have increased 9% and 10%, respectively.

Liquidity and Capital Resources

Our financial position as of May 31, 2016 remained strong with cash and total corporate investments of $793.2 million and no debt. We believe that our investments as of May 31, 2016 were not other-than-temporarily impaired, nor has any event occurred subsequent to that date that would indicate any other-than-temporary impairment. We anticipate that cash and total corporate investments as of May 31, 2016, along with projected operating cash flows, will support our normal business operations, capital purchases, business acquisitions, share repurchases, and dividend payments for the foreseeable future.

Commitments and Contractual Obligations

Lines of credit:  As of May 31, 2016, we had unused borrowing capacity available under uncommitted, secured, short-term lines of credit at market rates of interest with financial institutions as follows:

Financial institution	Amount available	Expiration date
JP Morgan Chase Bank, N.A.	$350 million	February 27, 2017
Bank of America, N.A.	$250 million	February 28, 2017
PNC Bank, National Association	$150 million	February 27, 2017
Wells Fargo Bank, National Association	$150 million	February 27, 2017

Our credit facilities are evidenced by promissory notes and are secured by separate pledge security agreements by and between Paychex, Inc. and each of the financial institutions (the “Lenders”), pursuant to which we have granted each of the Lenders a security interest in certain of our investment securities accounts. The collateral is maintained in a pooled custody account pursuant to the terms of a control agreement and is to be administered under an intercreditor agreement among the Lenders. Under certain circumstances, individual Lenders may require that collateral be transferred from the pooled account into segregated accounts for the benefit of such individual Lenders.

The primary uses of the lines of credit would be to meet short-term funding requirements related to deposit account overdrafts and client fund obligations arising from electronic payment transactions on behalf of our clients in the ordinary course of business, if necessary. No amounts were outstanding against these lines of credit during fiscal 2016 or as of May 31, 2016.

Certain of the financial institutions are also parties to our credit facility and irrevocable standby letters of credit, which are discussed below.

20

Credit facilities:  On August 5, 2015, the Company entered into a committed, unsecured, five-year syndicated credit facility, expiring on August 5, 2020.  Under the credit facility, Paychex of New York LLC (the “Borrower”) may, subject to certain restrictions, borrow up to $1 billion to meet short-term funding requirements.  The obligations under this facility have been guaranteed by the Company and certain of its subsidiaries.  The outstanding obligations under this credit facility will bear interest at competitive rates to be elected by the Borrower.  Upon expiration of the commitment in August 2020, any borrowings outstanding will mature and be payable on such date.  This agreement supersedes the $750 million credit facility agreement set to expire on June 21, 2018, which was terminated as part of the new agreement.

There were no amounts outstanding under this credit facility as of May 31, 2016.  During fiscal 2016,  the Company borrowed against this facility, and its predecessor facility, for one-day periods each, from one to two times a quarter as follows:

$ in millions	2016				2015
Number of days borrowed		5			2
Maximum amount borrowed	$	450.0		$	150.0
Average amount borrowed	$	305.0		$	125.0
Weighted-average interest rate		3.39	%		3.25	%

The Company subsequently borrowed $100 million for one day under this line in June 2016.

The credit facility contains various financial and operational covenants that are usual and customary for such arrangements.  The Borrower was in compliance with these covenants during fiscal 2016. 

Certain lenders under this credit facility, and their respective affiliates, have performed, and may in the future perform for us, various commercial banking, investment banking, underwriting, and other financial advisory services, for which they have received, and will continue to receive in the future, customary fees and expenses.

OnMarch 17, 2016, the Company entered into a committed, unsecured, three-year credit facility with PNC Bank, National Association, expiring on March17, 2019.   Under the credit facility, Paychex Advance LLC (“Paychex Advance”) may, subject to certain restrictions, borrow up to $150 million to finance working capital needs and for general corporate purposes.  The obligations under this facility have been guaranteed by the Company and certain of its subsidiaries.  The outstanding obligations under this credit facility will bear interest at competitive rates to be elected by Paychex Advance.  Upon expiration of the commitment in March 2019, any borrowings outstanding will mature and be payable on such date.

There were no amounts outstanding under this credit facility as of May 31, 2016.  Subsequent to May 31, 2016, Paychex Advance borrowed approximately $56 million under this line, which remains outstanding as of the date of this report.

Letters of credit:  As of May 31, 2016, we had irrevocable standby letters of credit outstanding totaling $43.0 million, required to secure commitments for certain insurance policies. The letters of credit expire at various dates between July 2016 and April 2017, and are collateralized by securities held in our investment portfolios. No amounts were outstanding on these letters of credit during fiscal 2016 or as of May 31, 2016. Subsequent to May 31, 2016, the letter of credit expiring in July 2016 was renewed through July 2017.

Other commitments:  We have entered into various operating leases and purchase obligations that, under GAAP, are not reflected on the Consolidated Balance Sheets as of May 31, 2016. The table below summarizes our estimated annual payment obligations under these commitments as of May 31, 2016:

	Payments due by period
			Less than						More than
In millions	Total		1 year		1-3 years		4-5 years		5 years
Operating leases(1)	$	106.7	$	35.7	$	48.5	$	20.3	$	2.2
Purchase obligations(2)		109.7		73.6		28.1		7.4		0.6
Total	$	216.4	$	109.3	$	76.6	$	27.7	$	2.8

(1) Operating leases are primarily for office space and equipment used in our branch operations.

(2) Purchase obligations include our estimate of the minimum outstanding commitments under purchase orders to buy goods and services and legally binding contractual arrangements with future payment obligations. Included in the total purchase obligations is $6.8 million of commitments to purchase capital assets. Amounts actually paid under certain of these arrangements may be different due to variable components of these agreements.

21

The liability for uncertain tax positions, including interest and net of federal benefits, was approximately $54.2 million as of May 31, 2016. Refer to Note J of the Notes to Consolidated Financial Statements contained in Item 8 of this Form 10-K for more information on income taxes. We are not able to reasonably estimate the timing of future cash flows related to this liability and have excluded it from the table above.

Certain deferred compensation plan obligations and other long-term liabilities reported in our Consolidated Balance Sheets amounting to $68.3 million are excluded from the table above because the timing of actual payments cannot be specifically or reasonably determined due to the variability in assumptions required to project the timing of future payments.

Advantage Payroll Services Inc. (“Advantage”) has license agreements with independently owned associate offices (“Associates”), which are responsible for selling and marketing Advantage Payroll Services® and performing certain operational functions, while Paychex and Advantage provide all centralized back-office payroll processing and payroll tax administration services. Under these arrangements, Advantage pays the Associates commissions based on processing activity for the related clients. When we acquired Advantage, there were fifteen Associates. Over the past few years, arrangements with some Associates have been discontinued, and there are currently fewer than ten Associates. Since the actual amounts of future payments are uncertain, obligations under these arrangements are not included in the table above. Commission expense for the Associates for fiscal years 2016,  2015, and 2014 was $16.1 million, $15.1million, and $14.4 million, respectively.

In the normal course of business, we make representations and warranties that guarantee the performance of services under service arrangements with clients. Historically, there have been no material losses related to such guarantees. In addition, we have entered into indemnification agreements with our officers and directors, which require us to defend and, if necessary, indemnify these individuals for certain pending or future legal claims as they relate to their services provided to us.

We currently self-insure the deductible portion of various insured exposures under certain employee benefit plans. Our estimated loss exposure under these insurance arrangements is recorded in other current liabilities on our Consolidated Balance Sheets. Historically, the amounts accrued have not been material and are not material as of the reporting date. We also maintain insurance coverage in addition to our purchased primary insurance policies for gap coverage for employment practices liability, errors and omissions, warranty liability, theft and embezzlement, cyber threats, and acts of terrorism; and capacity for deductibles and self-insured retentions through our captive insurance company.

Off-Balance Sheet Arrangements

As part of our ongoing business, we do not participate in transactions with unconsolidated entities which would have been established for the purpose of facilitating off-balance sheet arrangements or other limited purposes. We do maintain investments as a limited partner in low-income housing projects that are not considered part of our ongoing operations. These investments are accounted for under the equity method of accounting and are less than 1% of our total assets as of May 31, 2016.

Operating Cash Flow Activities

	Year ended May 31,
In millions	2016		2015		2014
Net income	$	756.8	$	674.9	$	627.5
Non-cash adjustments to net income		234.9		211.4		198.6
Cash provided by changes in operating assets and liabilities		26.5		8.9		54.8
Net cash provided by operating activities	$	1,018.2	$	895.2	$	880.9

The increase in our operating cash flows for fiscal 2016 compared to fiscal 2015 is primarily the result of higher net income, adjusted for non-cash items, along with the positive impact from fluctuations in our operating assets and liabilities.  The increase for fiscal 2015 compared to fiscal 2014 is primarily the result of higher net income, adjusted for non-cash items, offset by the decrease in cash provided by changes in our operating assets and liabilities.  Non-cash adjustments to net income increased for both fiscal 2016 and fiscal 2015, compared to the respective prior year periods.  The increase in non-cash adjustments for fiscal 2016 was largely due to higher depreciation expense related to an increase in internally developed software placed in service, and an increase in the deferred tax provision.  The increase in non-cash adjustments for fiscal 2015 was largely due to higher amortization of premiums on available-for-sale securities as the Company has increased its holdings of longer-duration investments, and higher stock-based compensation costs.  The fluctuations in our operating assets and liabilities between all periods were primarily related to the timing of collections from clients and payments for compensation, PEO payroll, income tax, and other liabilities. 

22

Investing Cash Flow Activities

	Year ended May 31,
In millions	2016		2015		2014
Net change in funds held for clients and corporate investment activities	$	339.7	$	(151.8)	$	(211.4)
Purchases of property and equipment		(97.7)		(102.8)		(84.1)
Acquisition of businesses, net of cash acquired		(296.1)		(27.1)		(9.3)
Purchases of other assets		(9.0)		(3.3)		(11.3)
Net cash used in investing activities	$	(63.1)	$	(285.0)	$	(316.1)

Funds held for clients and corporate investments:  Funds held for clients consist of short-term funds and available-for-sale securities. Corporate investments are primarily comprised of available-for-sale securities. The portfolio of funds held for clients and corporate investments is detailed in Note F of the Notes to Consolidated Financial Statements contained in Item 8 of this Form 10-K.

Fluctuations in the net change in funds held for clients and corporate investment activities are largely due to timing within the client funds portfolio.  For fiscal 2016 compared to fiscal 2015, there was a significant fluctuation due to timing of the day of the week for fiscal year-end.  There were larger cash outflows on Tuesday, May 31, 2016 that required the liquidation of funds held in the funds held for clients portfolio.  This resulted in positive cash flow from investing activities for fiscal 2016.  Our net cash inflow from funds held for clients and corporate investment activities for fiscal 2016 was partially offset by the change in mix of investments with more invested in VRDN securities and less in cash equivalents as of May 31, 2016.  For fiscal 2015 compared to fiscal 2014, there was not a significant fluctuation due to timing of the day of the week for fiscal year-end.  The net cash outflow position for both fiscal 2015 and fiscal 2014 is related to more purchases of short-term and available-for-sale securities resulting from higher average collections from clients.  See further discussion of this timing in the financing cash flows discussion of net change in client fund obligations.

In general, fluctuations in net funds held for clients and corporate investment activities primarily relate to timing of purchases, sales, or maturities of investments. The amount of funds held for clients will vary based upon the timing of collection of client funds, and the related remittance of funds to applicable tax or regulatory agencies for payroll tax administration services and to employees of clients utilizing employee payment services.  Additional discussion of interest rates and related risks is included in the “Market Risk Factors” section contained in Item 7A of this Form 10-K.

Other investing activities:  To support our continued client and ancillary product growth, purchases of property and equipment were made for data processing equipment and software, and for the expansion and upgrade of various operating facilities. During fiscal years 2016,  2015, and 2014, we purchased approximately $4.9 million,$6.9 million, and $4.7 million, respectively, of data processing equipment and software from EMC Corporation. The Chairman, President, and Chief Executive Officer of EMC Corporation is a member of our Board of Directors (the “Board”).

During fiscal 2016, we paid, net of cash acquired,  $296.1 million for the acquisition of Advance Partners.  During fiscal years 2015 and 2014, we paid, net of cash acquired,$27.1 million and $9.3 million, respectively, for immaterial business acquisitions. 

Financing Cash Flow Activities

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Net change in client fund obligations	$	(304.8)	$	93.0	$	127.4
Dividends paid		(606.5)		(551.8)		(510.6)
Repurchases of common shares		(107.9)		(182.4)		(249.7)
Equity activity related to stock-based awards		25.6		48.5		113.3
Net cash used in financing activities	$	(993.6)	$	(592.7)	$	(519.6)
Cash dividends per common share	$	1.68	$	1.52	$	1.40

Net change in client fund obligations:  The client fund obligations liability will vary based on the timing of collecting client funds, and the related required remittance of funds to applicable tax or regulatory agencies for payroll tax administration services and to employees of clients utilizing employee payment services. Collections from clients are typically remitted from one to 30 days after receipt, with some items extending to 90 days.

23

Fluctuations in net change in client fund obligations for the years presented are primarily the result of timing of collections and remittances and overall trends in client fund balances.   Timing for fiscal 2016 resulted in a net cash outflow position.   May 31, 2016 was a Tuesday, a larger cash outflow day due to clearing of Readychex and tax payments.  As May 31, 2015 was a Sunday, cash on hand would have been higher.  As a result, there was a net cash outflow over the period in fiscal 2016.

May 31, 2015 fell on a Sunday, while May 31, 2014 fell on a Saturday.  Friday is a large cash outflow day for direct deposit funds, partially offset by tax payment funds collected on that day.  This impact was consistent and did not impact the net cash flow position for client funds obligations reflected in fiscal 2015 or fiscal 2014.  The net cash inflow position in those years is the result of growth in average client funds held.  The slight decrease in net cash inflows for fiscal 2015 was the result of lower cash collections for state unemployment insurance with many states lowering their rates early in calendar 2015.

Dividends paid:  In July 2015, the Board increased our quarterly dividend to stockholders by 11% to $0.42 per share from $0.38 per share.  In July 2014, the Board increased our quarterly dividend to stockholders by 9% to $0.38 per share from $0.35 per share. The dividends paid as a percentage of net income totaled 80%, 82%, and 81% for fiscal years 2016,  2015, and 2014, respectively. The payment of future dividends is dependent on our future earnings and cash flow, and is subject to the discretion of our Board.

Repurchases of common shares:  In May 2014, the Board approved a program to repurchase up to $350 million of Paychex common stock, with authorization expiring in May 2017. Under this share repurchase program, we repurchased 2.2 million shares for a total of $107.9 million during fiscal 2016 and 3.9 million shares for a total of $182.4 million during fiscal 2015.  In fiscal 2014, we repurchased 6.2 million shares for a total of $249.7 million under a previously authorized program to repurchase up to $350 million of Paychex common stock, with authorization for that program expiring in May 2014.

Equity activity related to stock-based awards:The decrease in activity related to stock-based awards for fiscal 2016 compared to fiscal 2015 and for fiscal 2015 compared to fiscal 2014 was largely driven by a decrease in proceeds from the exercise of stock options. Shares of common stock acquired through the exercise of stock options were 0.9 million shares, 1.6 million shares, and 3.4 million shares for fiscal years 2016, 2015, and 2014, respectively.  Refer to Note E of the Notes to Consolidated Financial Statements contained in Item 8 of this Form 10-K for additional disclosures on our stock-based compensation plans.

Other

Recently adopted accounting pronouncements:  Refer to Note A of the Notes to Consolidated Financial Statements contained in Item 8 of this Form 10-K for a discussion of recently adopted accounting pronouncements.

Recently issued accounting pronouncements:  Refer to Note A of the Notes to Consolidated Financial Statements contained in Item 8 of this Form 10-K for a discussion of recently issued accounting pronouncements.

Critical Accounting Policies

Note A of the Notes to Consolidated Financial Statements contained in Item 8 of this Form 10-K discusses the significant accounting policies of Paychex. Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with U.S. GAAP. The preparation of these financial statements requires us to make estimates, judgments, and assumptions that affect reported amounts of assets, liabilities, revenue, and expenses. On an ongoing basis, we evaluate the accounting policies and estimates used to prepare the consolidated financial statements. We base our estimates on historical experience, future expectations, and assumptions believed to be reasonable under current facts and circumstances. Actual amounts and results could differ from these estimates. Certain accounting policies that are deemed critical to our results of operations or financial position are discussed below.

Revenue recognition:  Service revenue is recognized in the period services are rendered and earned under service arrangements with clients where service fees are fixed or determinable and collectability is reasonably assured. Certain processing services are provided under annual service arrangements with revenue recognized ratably over the service period. Our service revenue is largely attributable to processing services where the fee is based on a fixed amount per processing period or a fixed amount per processing period plus a fee per employee or transaction processed. Fees earned for funding of temporary staffing clients’ payrolls via purchase of accounts receivable are based on a percentage of funding amounts as specified in the client contract.  The revenue earned from delivery service for the distribution of certain client payroll checks and reports is included in service revenue, and the costs for delivery are included in operating expenses on the Consolidated Statements of Income and Comprehensive Income.

24

For certain of our service offerings, we receive advance payments for set-up fees from our clients. We defer revenue associated with these advance payments and the related costs, recognizing the revenue and related expenses over the expected life of clients.

PEO revenue is included in service revenue and is reported net of certain direct pass-through costs billed and incurred, which include wages, taxes, and certain benefit premiums.  Direct costs related to certain benefit plans where the Company retains risk are classified as operating expenses rather than as a reduction in service revenue.

Interest on funds held for clients is earned primarily on funds that are collected from clients before due dates for payroll tax administration services and for employee payment services, and invested until remittance to the applicable tax or regulatory agencies or client employees. These collections from clients are typically remitted from one to 30 days after receipt, with some items extending to 90 days. The interest earned on these funds is included in total revenue on the Consolidated Statements of Income and Comprehensive Income because the collecting, holding, and remitting of these funds are critical components of providing these services. Interest on funds held for clients also includes net realized gains and losses from the sales of available-for-sale securities.

PEO insurance reserves:  As part of the PEO service, we offer workers’ compensation insurance and health insurance to client companies for the benefit of client employees.  Workers' compensation insurance is provided under a fully insured high deductible workers’ compensation policy with a national insurance carrier. Workers’ compensation insurance reserves are established to provide for the estimated costs of paying claims up to per occurrence liability limits. In establishing the PEO workers' compensation insurance reserves, we use an independent actuarial estimate of undiscounted future cash payments that would be made to settle the claims.

Estimating the ultimate cost of future claims is an uncertain and complex process based upon historical loss experience and actuarial loss projections, and is subject to change due to multiple factors, including economic trends, changes in legal liability law, and damage awards, all of which could materially impact the reserves as reported in the consolidated financial statements. Accordingly, workers' compensation final claim settlements may vary from the present estimates, particularly when those payments may not occur until well into the future.

With respect to our PEO health insurance, we offer various health insurance plans that take the form of either fully insured fixed cost plans with various national insurance carriers or a fully insured minimum premium insurance arrangement with coverage provided through a single national carrier. Under the minimum premium arrangement, our health benefits insurance reserves are established to provide for the payment of claims liability charges in accordance with our service contract with the carrier. The claims liability charges include estimates for reported losses, plus amounts for those claims incurred but not reported, and estimates of certain expenses associated with processing and settling the claims.

We regularly review the adequacy of our estimated insurance reserves. Adjustments to previously established reserves are reflected in the results of operations for the period in which the adjustment is identified. Such adjustments could possibly be significant, reflecting any combination of new and adverse or favorable trends.

Goodwill and other intangible assets:Goodwill is not amortized, but instead is tested for impairment on an annual basis and between annual tests if an event occurs or circumstances change in a way to indicate that there has been a potential decline in the fair value of the reporting unit.  We performed our annual impairment testing in our fiscal fourth quarter.  A quantitative analysis was performed for our German reporting unit.  For all other reporting units, we utilized a qualitative assessment to determine if it is more-likely-than-not that the fair value of the reporting unit had declined below its carrying value.  The assessment considered various financial, macroeconomic, industry, and reporting unit specific qualitative factors.  Based on the results of our testing, no impairment loss was recognized in the results of operations for fiscal years 2016, 2015, or 2014.  Subsequent to this review, there have been no events or circumstances that indicate any potential impairment of our goodwill balance.

We also test intangible assets for potential impairment when events or changes in circumstances indicate that the carrying value may not be recoverable.

25

Stock-based compensation costs:  All stock-based awards to employees, including grants of stock options, are recognized as compensation costs in our consolidated financial statements based on their fair values measured as of the date of grant. We estimate the fair value of stock option grants using a Black-Scholes option pricing model. This model requires various assumptions as inputs including expected volatility of the Paychex stock price and expected option life. We estimate volatility based on a combination of historical volatility using stock prices over a period equal to the expected option life and implied market volatility. Expected option life is estimated based on historical exercise behavior.  We periodically reassess our assumptions as well as our choice of valuation model, and will reconsider use of this model if additional information becomes available in the future indicating that another model would provide a more accurate estimate of fair value, or if characteristics of future grants would warrant such a change.

We are required to estimate forfeitures and only record compensation costs for those awards that are expected to vest. Our assumptions for forfeitures were determined based on type of award and historical experience. Forfeiture assumptions are adjusted at the point in time a significant change is identified, with any adjustment recorded in the period of change, and the final adjustment at the end of the requisite service period to equal actual forfeitures.

The assumptions of volatility, expected option life, and forfeitures all require significant judgment and are subject to change in the future due to factors such as employee exercise behavior, stock price trends, and changes to type or provisions of stock-based awards. Any change in one or more of these assumptions could have a material impact on the estimated fair value of a future award.

Refer to Note E of the Notes to Consolidated Financial Statements contained in Item 8 of this Form 10-K for further discussion of our stock-based compensation plans.

Income taxes:  We account for deferred taxes by recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the consolidated financial statements or tax returns. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. We record a deferred tax asset related to the stock-based compensation costs recognized for certain stock-based awards. At the time non-qualified stock options are exercised or stock awards vest, we account for the resulting tax deduction by reducing our accrued income tax liability with an offset to the deferred tax asset and any excess of the tax benefit over the deferred tax asset as an increase to additional paid-in capital. We currently have a sufficient pool of excess tax benefits in additional paid-in capital to absorb any deficiency in tax benefits that fall short of the related deferred tax asset related to stock-based awards.

We maintain a reserve for uncertain tax positions. We evaluate tax positions taken or expected to be taken in a tax return for recognition in our consolidated financial statements. Prior to recording the related tax benefit in our consolidated financial statements, we must conclude that tax positions will be more-likely-than-not to be sustained, assuming those positions will be examined by taxing authorities with full knowledge of all relevant information. The benefit recognized in our consolidated financial statements is the amount we expect to realize after examination by taxing authorities. If a tax position drops below the more-likely-than-not standard, the benefit can no longer be recognized. Assumptions, judgment, and the use of estimates are required in determining if the more-likely-than-not standard has been met when developing the provision for income taxes and in determining the expected benefit. A change in the assessment of the more-likely-than-not standard could materially impact our results of operations or financial position. Refer to Note J of the Notes to Consolidated Financial Statements contained in Item 8 of this Form 10-K for further discussion of our reserve for uncertain tax positions.

26

Item 7A.Quantitative and Qualitative Disclosures About Market Risk

Market Risk Factors

Changes in interest rates and interest rate risk:    Funds held for clients are primarily comprised of short-term funds and available-for-sale securities. Corporate investments are primarily comprised of available-for-sale securities. As a result of our investing activities, we are exposed to changes in interest rates that may materially affect our results of operations and financial position. Changes in interest rates will impact the earnings potential of future investments and will cause fluctuations in the fair value of our longer-term available-for-sale securities. We follow an investment strategy of protecting principal and optimizing liquidity. A substantial portion of our portfolios is invested in high credit quality securities with AAA and AA ratings and A-1/P-1 ratings on short-term securities. We invest predominately in municipal bonds including general obligation bonds, pre-refunded bonds that are secured by a U.S. government escrow, and essential services revenue bonds, along with U.S. government agency securities and corporate bonds. We limit the amounts that can be invested in any single issuer and invest primarily in short- to intermediate-term instruments whose fair value is less sensitive to interest rate changes. We manage the available-for-sale securities to a benchmark duration of two and one-half to three and three-quarters years.

During fiscal 2016, our primary short-term investment vehicles were bank demand deposit accounts, VRDNs,high-quality commercial paper, andgovernment agency discount notes. We have no exposure to high-risk or illiquid investments.  We have insignificant exposure to European investments. We have not and do not utilize derivative financial instruments to manage our interest rate risk.

During fiscal 2016, the average interest rate earned on our combined funds held for clients and corporate investment portfolios was 1.1%, comparedto 1.0% for fiscal years 2015 and 2014. When interest rates are rising, the full impact of higher interest rates will not immediately be reflected in net income due to the interaction of short- and long-term interest rate changes. During a rising interest rate environment, earnings increase from our short-term investments, and over time increase earnings from our longer-term available-for-sale securities. Earnings from the available-for-sale securities, which as of May 31, 2016 had an average duration of 3.1 years, would not reflect increases in interest rates until the investments are sold or mature and the proceeds are reinvested at higher rates.

The amortized cost and fair value of available-for-sale securities that had stated maturities as of May 31, 2016 are shown below by contractual maturity. Expected maturities can differ from contractual maturities because borrowers may have the right to prepay obligations without prepayment penalties.

	May 31, 2016
	Amortized		Fair
In millions	cost		value
Maturity date:
Due in one year or less	$	359.6	$	360.7
Due after one year through three years		742.7		749.4
Due after three years through five years		918.5		935.7
Due after five years		2,073.5		2,096.1
Total	$	4,094.3	$	4,141.9

VRDNs are primarily categorized as due after five years in the table above as the contractual maturities on these securities are typically 20 to 30 years. Although these securities are issued as long-term securities, they are priced and traded as short-term instruments because of the liquidity provided through the tender feature.

The Federal Funds rate was raised by 25 basis points in December 2015 and has been in the range of 0.25% to 0.50% since then. Previously the Federal Funds rate had remained at a range of zero to 0.25% since December 2008.

Calculating the future effects of changing interest rates involves many factors. These factors include, but are not limited to:

•    daily interest rate changes;

•    seasonal variations in investment balances;

•    actual duration of short-term and available-for-sale securities;

•    the proportion of taxable and tax-exempt investments;

•    changes in tax-exempt municipal rates versus taxable investment rates, which are not synchronized or simultaneous; and

27

•    financial market volatility and the resulting effect on benchmark and other indexing interest rates.

Subject to these factors and under normal financial market conditions, a 25-basis-point change in taxable interest rates generally affects our tax-exempt interest rates by approximately 17 basis points. Under normal financial market conditions, the impact to earnings from a 25-basis-point change in short-term interest rates would be approximately $3.5 million to $4.0 million, after taxes, for a twelve-month period. Such a basis point change may or may not be tied to changes in the Federal Funds rate.

Our total investment portfolio (funds held for clients and corporate investments) averaged approximately $5.0 billion for fiscal 2016. Our anticipated allocation is approximately 45% invested in short-term securities and VRDNs with an average duration of less than 30 days, and 55% invested in available-for-sale securities with an average duration of two and one-half to three and three-quarters years.

The combined funds held for clients and corporate available-for-sale securities reflected a net unrealized gain of $47.6 million as of May 31, 2016, compared with an unrealized gain of $13.6 million as of May 31, 2015.   Refer to Note G of the Notes to Consolidated Financial Statements contained in Item 8 of this Form 10-K for additional disclosures on fair value measurements.

During fiscal 2016, the net unrealized gain on our investment portfolios ranged from $3.7 million to $72.2 million. During fiscal 2015, the net unrealized gain on our investment portfolios ranged from an unrealized gain of $9.5 million to $55.9 million. The net unrealized gain on our investment portfolios was approximately $63.5 as of July 15, 2016.

As of May 31, 2016 and 2015, we had $4.1 billion and $3.6 billion, respectively, invested in available-for-sale securities at fair value. The weighted-average yield-to-maturity was 1.7% and 1.6% as of May 31, 2016 and 2015, respectively. The weighted-average yield-to-maturity excludes available-for-sale securities tied to short-term interest rates such as the VRDNs. Assuming a hypothetical increase in longer-term interest rates of 25 basis points, the resulting potential decrease in fair value for our portfolio of available-for-sale securities as of May 31, 2016, would be in the range of $20.0 million to $25.0 million. Conversely, a corresponding decrease in interest rates would result in a comparable increase in fair value. This hypothetical increase or decrease in the fair value of the portfolio would be recorded as an adjustment to the portfolio’s recorded value, with an offsetting amount recorded in stockholders’ equity. These fluctuations in fair value would have no related or immediate impact on the results of operations, unless any declines in fair value were considered to be other-than-temporary and an impairment loss recognized.

Credit risk:    We are exposed to credit risk in connection with these investments through the possible inability of the borrowers to meet the terms of their bonds. We regularly review our investment portfolios to determine if any investment is other-than-temporarily impaired due to changes in credit risk or other potential valuation concerns. We believe that the investments we held as of May 31, 2016 were not other-than-temporarily impaired. While $155.6 million of our available-for-sale securities had fair values that were below amortized cost, we believe that it is probable that the principal and interest will be collected in accordance with the contractual terms, and that the unrealized losses of $0.7 million were due to changes in interest rates and were not due to increased credit risk or other valuation concerns. A significant portion of these securities in an unrealized loss position as of May 31, 2016 and 2015 held an AA rating or better. We do not intend to sell these investments until the recovery of their amortized cost basis or maturity, and further believe that it is not more-likely-than-not that we will be required to sell these investments prior to that time. Our assessment that an investment is not other-than-temporarily impaired could change in the future due to new developments or changes in our strategies or assumptions related to any particular investment.

We have some credit risk exposure in connection with our purchase of accounts receivable as a means of providing funding to clients in the temporary staffing industry.  This credit risk exposure is diversified amongst multiple client arrangements and all such arrangements are regularly reviewed for potential write-off.  No single client is material in respect to total accounts receivable, service revenue, or results of operations. 

28

Item 8.Financial Statements and Supplementary Data

TABLE OF CONTENTS

Description	Page
Report on Management’s Assessment of Internal Control Over Financial Reporting	30
Report of Independent Registered Public Accounting Firm	31
Consolidated Statements of Income and Comprehensive Income for the Years Ended May 31, 2016, 2015, and 2014	32
Consolidated Balance Sheets as of May 31, 2016 and 2015	33
Consolidated Statements of Stockholders’ Equity for the Years Ended May 31, 2016, 2015, and 2014	34
Consolidated Statements of Cash Flows for the Years Ended May 31, 2016, 2015, and 2014	35
Notes to Consolidated Financial Statements	36
Schedule II — Valuation and Qualifying Accounts for the Years Ended May 31, 2016, 2015, and 2014	58

29

REPORT ON MANAGEMENT’S ASSESSMENT OF

INTERNAL CONTROL OVER FINANCIAL REPORTING

Management of Paychex, Inc. (the “Company”) is responsible for establishing and maintaining adequate internal control over financial reporting as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as amended. The Company’s internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of the financial statements for external purposes in accordance with generally accepted accounting principles.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Management assessed the effectiveness of the Company’s internal control over financial reporting as of May 31, 2016. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission in “Internal Control — Integrated Framework” (2013). Based on our assessment, management determined that the Company maintained effective internal control over financial reporting as of May 31, 2016.

The Company’s independent registered public accounting firm, PricewaterhouseCoopers LLP, is appointed by the Company’s Audit Committee. PricewaterhouseCoopers LLP has audited the Consolidated Financial Statements included in this Annual Report on Form 10-K and the effectiveness of the Company's internal control over financial reporting as of May 31, 2016, and as a part of their integrated audit, has issued their report, included herein, on the effectiveness of the Company’s internal control over financial reporting.

/s/    Martin Mucci Martin Mucci President and Chief Executive Officer /s/    Efrain Rivera Efrain Rivera Senior Vice President, Chief Financial Officer, and Treasurer

30

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders of Paychex, Inc.

In our opinion, the accompanying consolidated balance sheets and the related consolidatedstatements of income and comprehensive income, of stockholders’ equity, and of cash flows present fairly, in all material respects, the financial position of Paychex, Inc. and its subsidiaries atMay 31, 2016 and May 31, 2015, and the results of their operations and their cash flows for each of the three years in the period endedMay 31, 2016 in conformity with accounting principles generally accepted in the United States of America.  In addition, in our opinion, the financial statement schedulelisted in the accompanying index appearing under Item 8 presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidatedfinancial statements.Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of May 31, 2016, based on criteria established in Internal Control - Integrated Framework(2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).  The Company's management is responsible for these financial statements and financial statement schedule, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Report on Management’s Assessment of Internal Control over Financial Reporting.  Our responsibility is to express opinions on these financial statements, on the financial statement schedule, and on the Company's internal control over financial reporting based on our integrated audits.  We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States).  Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects.  Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation.  Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk.  Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles.  A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements.  Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PricewaterhouseCoopers LLP

Rochester, New York

July 22, 2016

31

PAYCHEX, INC.

CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

In millions, except per share amounts

Year ended May 31,	2016		2015		2014
Revenue:
Service revenue	$	2,905.8	$	2,697.5	$	2,478.2
Interest on funds held for clients		46.1		42.1		40.7
Total revenue		2,951.9		2,739.6		2,518.9
Expenses:
Operating expenses		857.1		808.0		732.5
Selling, general and administrative expenses		948.2		878.0		803.7
Total expenses		1,805.3		1,686.0		1,536.2
Operating income		1,146.6		1,053.6		982.7
Investment income, net		4.5		6.4		5.4
Income before income taxes		1,151.1		1,060.0		988.1
Income taxes		394.3		385.1		360.6
Net income	$	756.8	$	674.9	$	627.5
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on securities, net of tax		21.7		(14.0)		(0.5)
Total other comprehensive income/(loss), net of tax		21.7		(14.0)		(0.5)
Comprehensive income	$	778.5	$	660.9	$	627.0
Basic earnings per share	$	2.10	$	1.86	$	1.72
Diluted earnings per share	$	2.09	$	1.85	$	1.71
Weighted-average common shares outstanding		360.7		362.9		364.5
Weighted-average common shares outstanding, assuming dilution		362.5		364.6		366.1
Cash dividends per common share	$	1.68	$	1.52	$	1.40

See Notes to Consolidated Financial Statements.

32

PAYCHEX, INC.

CONSOLIDATED BALANCE SHEETS

In millions, except per share amount

As of May 31,	2016		2015
Assets
Cash and cash equivalents	$	131.5	$	170.0
Corporate investments		220.6		366.6
Interest receivable		36.1		37.9
Accounts receivable, net of allowance for doubtful accounts		408.6		176.6
Prepaid income taxes		10.5		12.9
Prepaid expenses and other current assets		58.8		50.8
Current assets before funds held for clients		866.1		814.8
Funds held for clients		3,997.5		4,273.4
Total current assets		4,863.6		5,088.2
Long-term corporate investments		441.1		399.8
Property and equipment, net of accumulated depreciation		353.0		353.9
Intangible assets, net of accumulated amortization		69.5		32.4
Goodwill		657.1		561.5
Prepaid income taxes		24.9		—
Other long-term assets		31.6		31.7
Total assets	$	6,440.8	$	6,467.5
Liabilities
Accounts payable	$	56.7	$	51.7
Accrued compensation and related items		247.8		210.4
Deferred revenue		26.3		11.2
Other current liabilities		79.8		39.6
Current liabilities before client fund obligations		410.6		312.9
Client fund obligations		3,955.3		4,260.1
Total current liabilities		4,365.9		4,573.0
Accrued income taxes		72.8		44.8
Deferred income taxes		22.1		1.8
Other long-term liabilities		68.3		62.4
Total liabilities		4,529.1		4,682.0
Commitments and contingencies — Note N
Stockholders’ equity
Common stock, $0.01 par value; Authorized: 600.0 shares;     Issued and outstanding:  360.4 shares as of May 31, 2016        and 361.2 shares as of May 31, 2015, respectively.		3.6		3.6
Additional paid-in capital		952.7		880.1
Retained earnings		926.2		894.3
Accumulated other comprehensive income		29.2		7.5
Total stockholders’ equity		1,911.7		1,785.5
Total liabilities and stockholders’ equity	$	6,440.8	$	6,467.5

See Notes to Consolidated Financial Statements.

33

PAYCHEX, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

In millions

								Accumulated
				Additional				other
	Common stock			paid-in		Retained		comprehensive
	Shares	Amount		capital		earnings		income		Total
Balance as of May 31, 2013	365.4	$	3.7	$	659.5	$	1,088.5	$	22.0	$	1,773.7
Net income							627.5				627.5
Unrealized losses on securities,    net of tax									(0.5)		(0.5)
Cash dividends declared							(510.6)				(510.6)
Repurchases of common shares	(6.2)		(0.1)		(11.2)		(238.4)				(249.7)
Stock-based compensation					26.4						26.4
Stock-based award transactions	3.8				119.7		(9.5)				110.2
Balance as of May 31, 2014	363.0		3.6		794.4		957.5		21.5		1,777.0
Net income							674.9				674.9
Unrealized losses on securities,    net of tax									(14.0)		(14.0)
Cash dividends declared							(551.8)				(551.8)
Repurchases of common shares	(3.9)				(7.2)		(175.2)				(182.4)
Stock-based compensation					31.5						31.5
Stock-based award transactions	2.1				61.4		(11.1)				50.3
Balance as of May 31, 2015	361.2		3.6		880.1		894.3		7.5		1,785.5
Net income							756.8				756.8
Unrealized gains on securities,    net of tax									21.7		21.7
Cash dividends declared							(606.5)				(606.5)
Repurchases of common shares	(2.2)				(4.1)		(103.8)				(107.9)
Stock-based compensation					34.6						34.6
Stock-based award transactions	1.4				42.1		(14.6)				27.5
Balance as of May 31, 2016	360.4	$	3.6	$	952.7	$	926.2	$	29.2	$	1,911.7

See Notes to Consolidated Financial Statements.

34

PAYCHEX, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

In millions

Year ended May 31,	2016		2015		2014
Operating activities
Net income	$	756.8	$	674.9	$	627.5
Adjustments to reconcile net income to net cash provided by    operating activities:
Depreciation and amortization on property and equipment and    intangible assets		115.1		106.6		105.0
Amortization of premiums and discounts on available-for-sale securities		75.7		76.2		70.3
Stock-based compensation costs		34.6		31.4		26.3
Provision/(benefit) for deferred income taxes		7.1		(4.1)		(4.9)
Provision for allowance for doubtful accounts		2.5		1.6		2.5
Net realized gains on sales of available-for-sale securities		(0.1)		(0.3)		(0.6)
Changes in operating assets and liabilities:
Interest receivable		1.8		(1.6)		(3.9)
Accounts receivable		(37.5)		(28.2)		(18.2)
Prepaid expenses and other current assets		(5.0)		(8.5)		22.5
Accounts payable and other current liabilities		63.3		51.1		45.1
Net change in other long-term assets and liabilities		3.9		(3.9)		9.3
Net cash provided by operating activities		1,018.2		895.2		880.9
Investing activities
Purchases of available-for-sale securities		(12,572.2)		(34,020.4)		(29,850.5)
Proceeds from sales and maturities of available-for-sale securities		11,984.3		33,719.5		30,080.6
Net change in funds held for clients’ money market securities and other    cash equivalents		927.6		149.1		(441.5)
Purchases of property and equipment		(97.7)		(102.8)		(84.1)
Acquisition of businesses, net of cash acquired		(296.1)		(27.1)		(9.3)
Purchases of other assets		(9.0)		(3.3)		(11.3)
Net cash used in investing activities		(63.1)		(285.0)		(316.1)
Financing activities
Net change in client fund obligations		(304.8)		93.0		127.4
Dividends paid		(606.5)		(551.8)		(510.6)
Repurchases of common shares		(107.9)		(182.4)		(249.7)
Equity activity related to stock-based awards		25.6		48.5		113.3
Net cash used in financing activities		(993.6)		(592.7)		(519.6)
(Decrease)/increase in cash and cash equivalents		(38.5)		17.5		45.2
Cash and cash equivalents, beginning of fiscal year		170.0		152.5		107.3
Cash and cash equivalents, end of fiscal year	$	131.5	$	170.0	$	152.5

See Notes to Consolidated Financial Statements.

35

PAYCHEX, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note A — Description of Business, Basis of Presentation, and Significant Accounting Policies

Description of business:  Paychex, Inc. and its wholly owned subsidiaries (collectively the “Company” or “Paychex”) is a leading provider of integrated human capital management (“HCM”) solutions for payroll, human resource, retirement, and insurance services for small- to medium-sized businesses in the United States (“U.S.”). The Company also has operations in Germany.

Paychex, a Delaware corporation formed in 1979, reports as one segment. Substantially all of the Company’s revenue is generated within the U.S. The Company also generates revenue within Germany, which represented less than one percent of the Company's total revenue for each of the years ended May 31, 2016 (“fiscal 2016”), 2015 (“fiscal 2015”), and 2014 (“fiscal 2014”). Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company as of May 31, 2016 and May 31, 2015. In addition, the Company has equity method investments for a joint-venture in Brazil and a minority investment in a Canadian entity, neither of which is significant.

Total revenue is comprised of service revenue and interest on funds held for clients. Service revenue is comprised primarily of the fees earned on our portfolio of HCM services, which include payroll processing and complementary human resource management and administration services. Payroll service revenue is earned primarily from payroll processing, payroll tax administration services, employee payment services, and other ancillary services. Payroll processing services include the calculation, preparation, and delivery of employee payroll checks; production of internal accounting records and management reports; preparation of federal, state, and local payroll tax returns; and collection and remittance of clients’ payroll obligations.

Our Human Resource Services (“HRS”) portfolio of services and products provide small- to medium-sized businesses with retirement services administration, insurance services, HR administration services, and other human resource services and products. Our comprehensive human resource outsourcing service is available through Paychex HR Solutions, an administrative services organization (“ASO”), and Paychex PEO, a professional employer organization (“PEO”). Both options offer businesses a combined package of services that includes payroll, employer compliance, human resource and employee benefits administration, risk management outsourcing, and the on-site availability of a professionally trained human resource services representative, among other services. These comprehensive bundles of services are designed to make it easier for businesses to manage their payroll and related benefits costs while providing a benefits package equal to that of larger companies. The PEO differs from the ASO in that Paychex serves as a co-employer of the clients’ employees, offers health care coverage to PEO client employees, and assumes the risks and rewards of workers’ compensation insurance and certain health insurance products. PEO services are sold through the Company’s registered and licensed subsidiary, Paychex Business Solutions, Inc. Paychex HR Essentials is an ASO product that provides support to the Company’s clients over the phone or online to help manage employee-related topics.

In connection with the automated payroll tax administration services, the Company electronically collects payroll taxes from clients’ bank accounts, typically on payday, prepares and files the applicable tax returns, and remits taxes to the applicable tax or regulatory agencies on the respective due dates. These taxes are typically paid between one and 30 days after receipt of collections from clients, with some items extending to 90 days. The Company handles regulatory correspondence, amendments, and penalty and interest disputes, and is subject to cash penalties imposed by tax or regulatory agencies for late filings and late or under payment of taxes. With employee payment services, employers are offered the option of paying their employees by direct deposit, payroll debit card, a check drawn on a Paychex account (Readychex®), or a check drawn on the employer’s account and electronically signed by Paychex. For the first three methods, Paychex electronically collects net payroll from the clients’ bank accounts, typically one business day before payday, and provides payment to the employees on payday.

The Company earns fees for funding of temporary staffing agencies payroll via purchasing of accounts receivable invoices.  The fees are deducted from the funding payment and revenue is recognized over an average collection period of 45 to 60 days.

In addition to service fees paid by clients, the Company earns interest on funds held for clients that are collected before due dates and invested until remittance to the applicable tax or regulatory agencies or client employees. The funds held for clients and related client fund obligations are included in the Consolidated Balance Sheets as current assets and current liabilities, respectively. The amount of funds held for clients and related client fund obligations varies significantly during the year.

Basis of presentation:  The consolidated financial statements include the accounts of Paychex, Inc. and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

36

Subsequent Events:  The Company has evaluated subsequent events for potential recognition and/or disclosure through the date of issuance of these financial statements.  On July 7, 2016, Paychex announced that the Board of Directors (the “Board”) approved a $0.04 increase in the Company’s regular quarterly dividend, an increase of 10%.  The quarterly dividend will go from $0.42 per share to $0.46 per share and is payable on August 25, 2016 to shareholders of record on August 1, 2016. 

Cash and cash equivalents:  Cash and cash equivalents consist of available cash, money market securities, and other investments with a maturity of 90 days or less at acquisition.

Accounts receivable, net of allowance for doubtful accounts:  Accounts receivable balances are shown on the Consolidated Balance Sheets net of the allowance for doubtful accounts of $4.2 million as of May 31, 2016 and $1.4 million as of May 31, 2015. Accounts receivable balances, net of allowance for doubtful accounts, include: 1) trade receivables for services provided to clients of $221.6 million as of May 31, 2016 and $176.6 million as of May 31, 2015; and 2) purchased receivables related to funding arrangements with clients, resulting from the acquisition of Advance Partners in December 2015, of $187.0 million as of May 31, 2016. Accounts receivable are written off and charged against the allowance for doubtful accounts when the Company has exhausted all collection efforts without success. No single client had a material impact on total accounts receivable, service revenue, or results of operations.

Funds held for clients and corporate investments:  Marketable securities included in funds held for clients and corporate investments consist primarily of securities classified as available-for-sale and are recorded at fair value obtained from an independent pricing service. The funds held for clients portfolio also includes cash, money market securities, and short-term investments. Unrealized gains and losses, net of applicable income taxes, are reported as other comprehensive income in the Consolidated Statements of Income and Comprehensive Income. Realized gains and losses on the sale of available-for-sale securities are determined by specific identification of the cost basis of each security. On the Consolidated Statements of Income and Comprehensive Income, realized gains and losses from the funds held for client portfolio and corporate investment portfolio are included in interest on funds held for clients and investment income, net, respectively.

Concentrations:  Substantially all of the Company’s deposited cash is maintained at large well-capitalized (as defined by their regulators) financial institutions. These deposits may exceed the amount of any insurance provided. All of the Company’s deliverable securities, primarily municipal bond securities, are held in custody with certain of the aforementioned financial institutions, for which that institution bears the risk of custodial loss. Non-deliverable securities, primarily time deposits and money market funds, are held by well-capitalized financial institutions.

Property and equipment, net of accumulated depreciation:  Property and equipment is stated at cost, less accumulated depreciation. Depreciation is based on the estimated useful lives of property and equipment using the straight-line method. The estimated useful lives of depreciable assets are generally as follows:

Category	Depreciable life
Buildings and improvements	Ten to 35 years or the remaining life, whichever is shorter
Data processing equipment	Three to four years
Furniture, fixtures, and equipment	Three to seven years
Leasehold improvements	Ten years or the life of the lease, whichever is shorter

Normal and recurring repairs and maintenance costs are charged to expense as incurred. The Company reviews the carrying value of property and equipment for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable.

Software development and enhancements:  Expenditures for software purchases and software developed for internal use are capitalized and depreciated on a straight-line basis over the estimated useful lives, which are generally three to five years. Software developed as part of the Company's main processing platform is depreciated over fifteen years.  For software developed for internal use, certain costs are capitalized, including external direct costs of materials and services associated with developing or obtaining the software, and payroll and payroll-related costs for employees who are directly associated with internal-use software projects. Capitalization of these costs ceases no later than the point at which the project is substantially complete and ready for its intended use. Costs associated with preliminary project stage activities, training, maintenance, and other post-implementation stage activities are expensed as incurred. The carrying value of software and development costs is reviewed for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable.

37

Goodwill and other intangible assets, net of accumulated amortization:  The Company has $657.1 million and $561.5 million of goodwill as of May 31, 2016 and 2015, respectively. Goodwill is not amortized, but instead is tested for impairment on an annual basis and between annual tests if an event occurs or circumstances change in a way to indicate that there has been a potential decline in the fair value of a reporting unit.  We performed our annual impairment testing in our fiscal fourth quarter.  A quantitative analysis was performed for our German reporting unit.  For all other reporting units, we utilized a qualitative assessment to determine if it more-likely-than-not that the fair value of the reporting unit had declined below its carrying value.  The assessment considered various financial, macroeconomic, industry, and reporting unit specific qualitative factors.  Based on the results of our testing, no impairment loss was recognized in the results of operations for fiscal years 2016, 2015, or 2014. Subsequent to the latest review, there have been no events or circumstances that indicate any potential impairment of the Company’s goodwill balance.

Intangible assets are comprised primarily of client list acquisitions and are reported net of accumulated amortization on the Consolidated Balance Sheets. Intangible assets are amortized over periods generally ranging from three to twelve years. Client lists use an accelerated method, while other intangible assets use the straight-line method of amortization. The Company tests intangible assets for potential impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable.

Revenue recognition:  Revenues are primarily attributable to fees for providing services as well as investment income earned on funds held for clients.  Fees associated with services are recognized in the period services are rendered and earned under service arrangements with clients where service fees are fixed or determinable and collectability is reasonably assured. Certain processing services are provided under annual service arrangements with revenue recognized ratably over the service period. The Company’s service revenue is largely attributable to processing services where the fee is based on a fixed amount per processing period or a fixed amount per processing period plus a fee per employee or transaction processed. Fees earned for funding of payrolls for temporary staffing agency clients via the purchase of accounts receivable invoices are based on a percentage of funding amounts as specified in the client contract. These fees are then recognized over the average collection period of 45 to 60 days.  The revenue earned from delivery service for the distribution of certain client payroll checks and reports is included in service revenue, and the costs for the delivery are included in operating expenses on the Consolidated Statements of Income and Comprehensive Income.

For certain of the Company's service offerings, it receives advance payments for set-up fees from its clients.  The Company defers revenue associated with these advance payments, recognizing the revenue and related expenses over the expected life of its clients.

PEO revenue is included in service revenue and is reported net of certain direct pass-through costs billed and incurred, which primarily include payroll wages, payroll taxes, and certain benefit premiums.  Direct costs related to certain benefit plans where the Company retains risk are recognized as operating expenses rather than as a reduction in service revenue. Direct pass-through costs billed and incurred that were a reduction in service revenue were $5.1 billion, $4.2 billion, and $3.4 billion for fiscal years 2016, 2015, and 2014, respectively.

Interest on funds held for clients is earned primarily on funds that are collected from clients before due dates for payroll tax administration services and for employee payment services, and invested until remittance to the applicable tax or regulatory agencies or client employees. The interest earned on these funds is included in total revenue on the Consolidated Statements of Income and Comprehensive Income because the collecting, holding, and remitting of these funds are components of providing these services. Interest on funds held for clients also includes net realized gains and losses from the sales of available-for-sale securities.

PEO insurance reserves:  As part of the PEO service, the Company offers workers’ compensation insurance and health insurance to client companies for the benefit of client employees. Workers' compensation insurance is provided under a fully insured high deductible workers’ compensation policy with a national insurance carrier. Workers’ compensation insurance reserves are established to provide for the estimated costs of paying claims up to per occurrence liability limits. In establishing the PEO workers' compensation insurance reserves, the Company uses an independent actuarial estimate of undiscounted future cash payments that would be made to settle the claims.

The Company’s maximum individual claims liability was $1.3 million and $1.0 million under its fiscal 2016 and fiscal 2015 workers' compensation policies, respectively. As of May 31, 2016 and May 31, 2015, the Company had recorded current liabilities of $13.8 million and $11.3 million, respectively, and long-term liabilities of $18.4 million and $15.3 million,  respectively, on its Consolidated Balance Sheets for workers’ compensation costs.

38

With respect to the PEO health insurance, the Company offers various health insurance plans that take the form of either fully insured fixed cost plans with various national insurance carriers or a fully insured minimum premium insurance arrangement with coverage provided through a single national carrier. Under the minimum premium arrangement, the Company's health benefits insurance reserves are established to provide for the payment of claims liability charges in accordance with its service contract with the carrier. The claims liability charges include estimates for reported losses, plus amounts for those claims incurred but not reported, and estimates of certain expenses associated with processing and settling the claims.  The Company's maximum individual claims liability is $0.3 million under both its calendar 2016 and 2015 minimum premium health insurance plan policies.  Amounts accrued related to the health insurance reserves are $9.5 million and $8.1 million as of May 31, 2016 and May 31, 2015, respectively. These amounts are included in current liabilities on the Consolidated Balance Sheets.

Estimating the ultimate cost of future claims is an uncertain and complex process based upon historical loss experience and actuarial loss projections, and is subject to change due to multiple factors, including economic trends, changes in legal liability law, and damage awards, all of which could materially impact the reserves as reported in the consolidated financial statements.  Accordingly, final claim settlements may vary from the present estimates, particularly with workers' compensation insurance where those payments may not occur until well into the future.  The Company regularly reviews the adequacy of its estimated insurance reserves.  Adjustments to previously established reserves are reflected in the results of operations for the period in which the adjustment is identified. Such adjustments could be significant, reflecting any combination of new and adverse or favorable trends.

Stock-based compensation costs:  All stock-based awards to employees are recognized as compensation costs in the consolidated financial statements based on their fair values measured as of the date of grant. The Company estimates the fair value of stock option grants using a Black-Scholes option pricing model. This model requires various assumptions as inputs including expected volatility of the Paychex stock price and expected option life. Volatility is estimated based on a combination of historical volatility, using stock prices over a period equal to the expected option life, and implied market volatility. Expected option life is estimated based on historical exercise behavior.  The Company periodically reassesses its assumptions as well as its choice of valuation model.  The Company will reconsider use of this model if additional information becomes available in the future indicating that another model would provide a more accurate estimate of fair value, or if characteristics of future grants would warrant such a change.

The fair value of stock awards is determined based on the stock price at the date of grant.  For grants that do not accrue dividends or dividend equivalents, the fair value is the stock price reduced by the present value of estimated dividends over the vesting period or performance period.

The Company is required to estimate forfeitures and only record compensation costs for those awards that are expected to vest. The assumptions for forfeitures were determined based on type of award and historical experience. Forfeiture assumptions are adjusted at the point in time a significant change is identified, with any adjustment recorded in the period of change, and the final adjustment at the end of the requisite service period to equal actual forfeitures.

The assumptions of volatility, expected option life, and forfeitures all require significant judgment and are subject to change in the future due to factors such as employee exercise behavior, stock price trends, and changes to type or provisions of stock-based awards. Any material change in one or more of these assumptions could have an impact on the estimated fair value of a future award.

Refer to Note E for further discussion of the Company’s stock-based compensation plans.

Income taxes:  The Company accounts for deferred taxes by recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the consolidated financial statements or tax returns. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities, using enacted tax rates in effect for the year in which the differences are expected to reverse. The Company records a deferred tax asset related to the stock-based compensation costs recognized for certain stock-based awards. At the time of the exercise of non-qualified stock options or vesting of stock awards, the Company accounts for the resulting tax deduction by reducing its accrued income tax liability with an offset to the deferred tax asset and any excess of the tax benefit over the deferred tax asset as an increase to additional paid-in capital. The Company currently has a sufficient pool of excess tax benefits in additional paid-in capital to absorb any deficiency in tax benefits that fall short of the related deferred tax asset related to stock-based awards.

39

The Company also maintains a reserve for uncertain tax positions. The Company evaluates tax positions taken or expected to be taken in a tax return for recognition in its consolidated financial statements. Prior to recording the related tax benefit in the consolidated financial statements, the Company must conclude that tax positions will be more-likely-than-not to be sustained, assuming those positions will be examined by taxing authorities with full knowledge of all relevant information. The benefit recognized in the consolidated financial statements is the amount the Company expects to realize after examination by taxing authorities. If a tax position drops below the more-likely-than-not standard, the benefit can no longer be recognized. Assumptions, judgment, and the use of estimates are required in determining if the more-likely-than-not standard has been met when developing the provision for income taxes and in determining the expected benefit. A change in the assessment of the more-likely-than-not standard could materially impact the Company’s results of operations or financial position. The Company’s reserve for uncertain tax positions, including interest and net of federal benefits, was $54.2 million as of May 31, 2016 and $29.1 million as of May 31, 2015. Refer to Note J for further discussion of the Company’s reserve for uncertain tax positions.

Use of estimates:  The preparation of financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires management to make estimates, judgments, and assumptions that affect reported amounts of assets, liabilities, revenue, and expenses during the reporting period. Actual amounts and results could differ from these estimates.

Reclassifications:  Certain prior period amounts have been reclassified to conform to the current period presentation and had no effect on reported consolidated earnings.

Recently adopted accounting pronouncements:  In March 2016, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”)  No. 2015-17 “Income Taxes (Topic 740) - Balance Sheet Classification of Deferred Taxes.” This guidance requires deferred tax assets and liabilities be classified as non-current in a classified statement of financial position. This guidance is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2016, with early application permitted as of the beginning of an interim or annual reporting period. With the adoption, the Company’s deferred tax assets and liabilities were classified as non-current on its Consolidated Balance Sheet and prior period amounts have been reclassified to conform with current year presentation. Adoption of this guidance did not materially impact its consolidated financial statements.

Recently issued accounting pronouncements:  In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606).”  This guidance supersedes current guidance on revenue recognition in Topic 605, “Revenue Recognition.”  In addition, there are disclosure requirements related to the nature, amount, timing, and uncertainty of revenue recognition.  This guidance will be effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods. Early application of the guidance is permitted for annual reporting periods beginning after December 31, 2016.  Additional ASUs have been issued to amend or clarify this ASU as follows:

· ASU No. 2016-12 “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients” was issued in May 2016. ASU No. 2016-12 amends the new revenue recognition standard to clarify the guidance on assessing collectability, presenting sales taxes, measuring noncash consideration, and certain transition matters.

· ASU No. 2016-10 “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing” was issued in April 2016. ASU No. 2016-10 addresses implementation issues identified by the FASB-International Accounting Standards Board Joint Transition Resource Group for Revenue Recognition (TRG). 

· ASU No. 2016-08 “Revenue from Contracts with Customers (Topic 606) - Principal versus Agent Considerations (Reporting Revenue Gross versus Net)” was issued in March 2016.   ASU No. 2016-08 requires an entity to determine whether the nature of its promise to provide goods or services to a customer is performed in a principal or agent capacity and to recognize revenue in a gross or net manner based on its principal/agent designation.

This guidance in these ASUs for revenue recognition is applicable to the Company's fiscal year beginning June 1, 2018.  The Company has substantially completed its initial analysis identifying the areas that will be impacted by the new guidance and is currently analyzing the impact to its consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13 “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.”ASU No. 2016-13 requires an organizationto measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts.  ASU No. 2016-13 is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2019. This guidance is applicable to the Company's fiscal year beginning June 1, 2020. The Company is currently evaluating this guidance to determine the potential impact on its consolidated financial statements.

40

In March 2016, the FASB issued ASU No. 2016-09 “Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU No. 2016-09 simplifies several aspects of the accounting for share-based payment award transactions, including income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows.  ASU No. 2016-09 is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2016, with early application permitted. This guidance is applicable to the Company's fiscal year beginning June 1, 2017. The Company does not anticipate this to be material to its consolidated financial statements, and anticipates adopting this standard for its fiscal year beginning June 1, 2016.

In February 2016, the FASB issued ASU No. 2016-02 “Leases (Topic 842).” ASU No. 2016-02 improves transparency and comparability among companies by recognizing lease assets and lease liabilities on the balance sheet and by disclosing key information about leasing arrangements. ASU No. 2016-02 is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2018, with early application permitted. This guidance is applicable to the Company's fiscal year beginning June 1, 2019. The Company is currently evaluating this guidance to determine the potential impact on its consolidated financial statements.

In January 2016, the FASB issued ASU No. 2016-01 “Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU No. 2016-01 provides updated guidance for the recognition, measurement, presentation, and disclosure of certain financial assets and liabilities. ASU No. 2016-01 is effective for public business entities for annual and interim periods beginning after December 15, 2017, with early application permitted. This guidance is applicable to the Company's fiscal year beginning June 1, 2018. The Company is currently evaluating this guidance to determine the potential impact on its consolidated financial statements.

Other recent authoritative guidance issued by the FASB (including technical corrections to the FASB Accounting Standards Codification), the American Institute of Certified Public Accountants, and the Securities and Exchange Commission (“SEC”) did not, or are not expected to have a material effect on the Company’s consolidated financial statements.

Note B — Basic and Diluted Earnings Per Share

Basic and diluted earnings per share were calculated as follows:

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Basic earnings per share:
Net income	$	756.8	$	674.9	$	627.5
Weighted-average common shares outstanding		360.7		362.9		364.5
Basic earnings per share	$	2.10	$	1.86	$	1.72
Diluted earnings per share:
Net income	$	756.8	$	674.9	$	627.5
Weighted-average common shares outstanding		360.7		362.9		364.5
Dilutive effect of common share equivalents		1.8		1.7		1.6
Weighted-average common shares outstanding, assuming dilution		362.5		364.6		366.1
Diluted earnings per share	$	2.09	$	1.85	$	1.71
Weighted-average anti-dilutive common share equivalents		0.5		0.3		0.7

Weighted-average common share equivalents that had an anti-dilutive impact are excluded from the computation of diluted earnings per share.

In May 2014, the Board approved a program to repurchase up to $350.0 million of the Company's common stock with authorization expiring on May 31, 2017. During fiscal 2016, the Company repurchased 2.2 million shares for $107.9 million and during fiscal 2015, the Company repurchased 3.9 million shares for $182.4 millionunder this program. All shares repurchased were retired.

In July 2016, the Board approved a new program to repurchase up to $350.0 million of the Company’s common stock with authorization expiring on May 31, 2019.  The purpose of the program is to manage common stock dilution.  Shares purchased will be retired.

41

Note C — Business Combination

Effective December 22, 2015, substantially all of the net assets of Advance Partners, a leading provider of integrated financial, operational, and strategic services to support independent staffing firms, were acquired by a wholly owned subsidiary of the Company.  Advance Partners offers customizable solutions to the temporary staffing industry, including payroll funding and outsourcing services, which include payroll, invoicing, and tax preparation.  The acquisition consideration was comprised of a base purchase price of $190.5 million plus immediate settlement of debt totaling $118.4 million, net of $12.8 million in cash acquired. Accounts receivable balances acquired, net of allowance for doubtful accounts, and less amounts due to clients related to funding arrangements, totaled $164.8 million. This acquisition allows the Company access to a growing industry serving small- to medium-sized businesses. Goodwill in the amount of $95.6 million was recorded as a result of the acquisition, which is tax-deductible.

The financial results of Advance Partners is included in the Company’s consolidated financial statements from the date of acquisition.  The Company concluded that the acquisition was not material to its results of operations or financial position.  Therefore, pro-forma financial information has been excluded.

Note D — Investment Income, Net

Investment income, net, consisted of the following items:

	Year ended May 31,
In millions	2016		2015		2014
Interest income on corporate funds	$	8.4	$	7.8	$	6.9
Interest expense		(1.1)		(0.7)		(1.1)
Net loss from equity-method investments		(2.8)		(0.7)		(0.4)
Investment income, net	$	4.5	$	6.4	$	5.4

Note E — Stock-Based Compensation Plans

The Paychex, Inc. 2002 Stock Incentive Plan, as amended and restated, effective on October 14, 2015 (the “2002 Plan”), authorizes grants of up to 44.1 million shares of the Company’s common stock. As of May 31, 2016, there were 22.2 million shares available for future grants under the 2002 Plan.

All stock-based awards to employees are recognized as compensation costs in the consolidated financial statements based on their fair values measured as of the date of grant. These costs are recognized as an expense in the Consolidated Statements of Income and Comprehensive Income on a straight-line basis over the requisite service period and increase additional paid-in capital.

Stock-based compensation expense was $34.6 million, $31.4 million, and $26.3 million for fiscal years 2016, 2015, and 2014, respectively. Related income tax benefits recognized were $12.9 million, $11.7 million, and $10.1 million for the respective fiscal years. Capitalized stock-based compensation costs related to the development of internal use software for these same fiscal years were not significant.

As of May 31, 2016, the total unrecognized compensation cost related to all unvested stock-based awards was $60.8 million and is expected to be recognized over a weighted-average period of 2.9 years.

42

Black-Scholes fair value assumptions:  The fair value of stock option grants and performance stock options was estimated at the date of grant using a Black-Scholes option pricing model. There were no performance stock options granted in fiscal 2016.  The weighted-average assumptions used for valuation under the Black-Scholes model are as follows:

	Year ended May 31,
	2014			2016			2015			2014
	Performance stock options			Stock options
Risk-free interest rate		1.5	%		1.9	%		2.1	%		2.0	%
Dividend yield		3.9	%		3.6	%		3.7	%		4.1	%
Volatility factor		0.20			0.18			0.21			0.22
Expected option life in years		4.5			6.1			6.0			6.4
Weighted-average grant-date   fair value of stock options granted (per share)	$	3.85		$	5.25		$	5.68		$	4.90

Risk-free interest rates are yields for zero coupon U.S. Treasury notes maturing approximately at the end of the expected option life. The estimated volatility factor is based on a combination of historical volatility, using stock prices over a period equal to the expected option life, and implied market volatility. The expected option life is based on historical exercise behavior.

The Company has determined that the Black-Scholes option pricing model, as well as the underlying assumptions used in its application, are appropriate in estimating the fair value of its stock option grants. The Company periodically assesses its assumptions as well as its choice of valuation model, and will reconsider use of this model if additional information becomes available in the future indicating that another model would provide a more accurate estimate of fair value, or if characteristics of future grants would warrant such a change.

Stock options:  Stock options entitle the holder to purchase, at the end of the vesting term, a specified number of shares of Paychex common stock at an exercise price per share set equal to the closing market price of the common stock on the date of grant. All stock options have a contractual life of ten years from the date of the grant and a vesting schedule as established by the Board. The Company issues new shares of common stock to satisfy stock option exercises. Non-qualified stock option grants to officers and outside directors are typically approved by the Board in July. Grants of non-qualified stock options to officers vest 25% per annum and grants to members of the Board vest after one year.

The following table summarizes stock option activity for the year ended May 31, 2016:

				Weighted-
		Weighted-		average
	Shares	average		remaining	Aggregate
	subject	exercise price		contractual	intrinsic
In millions, except per share amounts	to options	per share		term (years)	value(1)
Outstanding as of May 31, 2015	4.7	$	35.21
Granted	0.8	$	47.42
Exercised	(0.9)	$	34.77
Forfeited	(0.1)	$	38.46
Expired	—	$	35.89
Outstanding as of May 31, 2016	4.5	$	37.42	6.3	$	75.9
Exercisable as of May 31, 2016	2.6	$	33.84	4.9	$	53.1

(1) Market price of the underlying stock as of May 31, 2016 less the exercise price.

Other information pertaining to stock option grants is as follows:

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Total intrinsic value of stock options exercised	$	14.5	$	17.6	$	18.9
Total grant-date fair value of stock options vested	$	4.0	$	3.6	$	3.0

43

Performance stock options:  In July 2011, the Board approved a special award of performance-based stock options under a Long-Term Incentive Plan. Subsequent grants of this award have been made upon hire of new officers.  Under this award, stock options were granted to officers with vesting dependent on achievement against long-term strategic and financial objectives. Total shares earned and vested are based on achievement against pre-established targets for fiscal 2016.  However, the terms of the award allowed for accelerated vesting of up to 50% of the award at target depending on achievement against pre-established targets for fiscal 2014.  Based on achievement against pre-established targets for fiscal 2016, a total of 63.0% of the award was earned.  In July 2014, 23.5% of the awards accelerated and vested based on achievement against performance targets for fiscal 2014.  The remaining 39.5% of the awards will vest in July 2016.

The following table summarizes performance stock option activity for the year ended May 31, 2016:

				Weighted-
		Weighted-		average
	Shares	average		remaining	Aggregate
	subject	exercise price		contractual	intrinsic
In millions, except per share amounts	to options	per share		term (years)	value(1)
Outstanding as of May 31, 2015	2.7	$	31.31
Granted	—	$	—
Exercised	(0.1)	$	31.11
Forfeited	(0.1)	$	29.85
Expired	—	$	—
Outstanding as of May 31, 2016	2.5	$	31.36	5.4	$	57.9
Exercisable as of May 31, 2016	0.4	$	31.22	5.2	$	9.6

(1) Market price of the underlying stock as of May 31, 2016 less the exercise price.

For fiscal 2016, the total intrinsic value of the performance stock options exercised was $1.0 million.

Restricted stock units:  The Board grants restricted stock units (“RSUs”) to non-officer management.  An RSU is an agreement to issue shares at the time of vesting with no associated exercise cost.  For each unit granted, the holder will receive one share of stock at the time of vesting.  RSUs do not have voting rights or earn dividend equivalents during the vesting period. These awards vest 20% per annum over five years. The fair value of RSUs is equal to the closing market price of the underlying common stock as of the date of grant, adjusted for the present value of expected dividends over the vesting period.

The following table summarizes RSU activity for the year ended May 31, 2016:

				Weighted-
		Weighted-		average
		average		remaining
		grant-date		vesting	Aggregate
		fair value		period	intrinsic
In millions, except per share amounts	RSUs	per share		(years)	value(1)
Nonvested as of May 31, 2015	1.8	$	33.57
Granted	0.7	$	42.60
Vested	(0.5)	$	31.34
Forfeited	(0.2)	$	35.97
Nonvested as of May 31, 2016	1.8	$	37.58	3.0	$	96.5

(1) Intrinsic value for RSUs is the market price of the underlying stock as of May 31, 2016.

Other information pertaining to RSUs is as follows:

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Weighted-average grant-date fair value of RSUs granted	$	42.60	$	36.64	$	36.37
Total intrinsic value of RSUs vested	$	25.9	$	21.7	$	18.3
Total grant-date fair value of RSUs vested	$	17.3	$	14.8	$	12.1

44

Restricted stock awards:  The Board has approved grants of restricted stock awards to the Company’s officers and outside directors. All shares underlying awards of restricted stock are restricted in that they are not transferable until they vest. The recipients of the restricted stock have voting rights and earn dividends, which are paid to the recipient at the time the awards vest. If the recipient leaves Paychex prior to the vesting date for any reason, the shares of restricted stock and the dividends accrued on those shares will be forfeited and returned to Paychex.

Time-vested restricted stock awards granted to officers vest one-third per annum. Restricted stock granted to outside directors vest on the one-year anniversary of the grant date. The fair value of restricted stock awards is equal to the closing market price of the underlying common stock as of the date of grant and is expensed over the requisite service period on a straight-line basis.

The following table summarizes restricted stock activity for the year ended May 31, 2016:

		Weighted-
		average
		grant-date
	Restricted	fair value
In millions, except per share amounts	shares	per share
Nonvested as of May 31, 2015	0.2	$	38.99
Granted	—	$	47.46
Vested	(0.1)	$	37.70
Forfeited	—	$	40.54
Nonvested as of May 31, 2016	0.1	$	43.99

Other information pertaining to restricted stock follows:

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Weighted-average grant-date fair value of restricted stock granted	$	47.46	$	41.70	$	38.53
Total grant-date fair value of restricted stock vested	$	3.0	$	3.5	$	3.3

Performance shares:  Performance shares have a two-year performance period, after which the amount of restricted shares earned will be determined based on achievement against established performance targets. The restricted shares earned will then be subject to a one year service period. Performance shares do not have voting rights or earn dividend equivalents during the performance period. The fair value of performance shares is equal to the closing market price of the underlying common stock as of the date of grant, adjusted for the present value of expected dividends over the performance period.

The following table summarizes performance share activity for the year ended May 31, 2016:

		Weighted-
		average
		grant-date
	Performance	fair value
In millions, except per share amounts	shares	per share
Nonvested as of May 31, 2015	0.6	$	34.24
Granted (1)	0.1	$	42.48
Vested	(0.2)	$	29.10
Forfeited	—	$	37.09
Nonvested as of May 31, 2016	0.5	$	38.89

(1) Performance shares granted assuming achievement of performance goals at target. Actual amount of shares to be earned may differ from this amount.

45

Non-compensatory employee benefit plan:  Prior to January 1, 2016, the Company offered a non-qualified
Employee Stock Purchase Plan (“ESPP”) to all employees under which the Company’s common stock could be purchased through a payroll deduction with no discount to the market price and no look-back provision. This ESPP was discontinued as of December 31, 2015.  Effective January 1, 2016, the Company began offering a qualified ESPP to all employees.  Under this new ESPP, the Company’s common stock can be purchased through a payroll deduction at a discount to the market price.  The Plan allows for a discount of up to 15% based on the sole discretion of the committee established to administer the plan.  For offering periods during fiscal 2016 the discount was set at 5% of the market price.  Transactions under the non-qualified ESPP occurred directly through the Company’s transfer agent and no brokerage fees were charged to employees, except for when stock was sold.  Transactions under the qualified ESPP occur through the Company’s third party stock plan administrator.  The plans have been deemed non-compensatory and therefore, no stock-based compensation costs have been recognized for fiscal years 2016, 2015, or 2014 related to either plan.

Note F — Funds Held for Clients and Corporate Investments

Funds held for clients and corporate investments are as follows:

	May 31, 2016
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
In millions	cost		gains		losses		value
Type of issue:
Funds held for clients money market securities and other    cash equivalents	$	502.4	$	—	$	—	$	502.4
Available-for-sale securities:
Corporate bonds		128.4		2.9		(0.1)		131.2
General obligation municipal bonds		1,594.1		27.6		(0.1)		1,621.6
Pre-refunded municipal bonds(1)		60.2		1.4		—		61.6
Revenue municipal bonds		916.2		15.8		(0.2)		931.8
U.S. government agency securities		160.8		0.6		(0.3)		161.1
Variable rate demand notes		1,234.6		—		—		1,234.6
Total available-for-sale securities		4,094.3		48.3		(0.7)		4,141.9
Other		14.2		0.8		(0.1)		14.9
Total funds held for clients and corporate investments	$	4,610.9	$	49.1	$	(0.8)	$	4,659.2

	May 31, 2015
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
In millions	cost		gains		losses		value
Type of issue:
Funds held for clients money market securities and other    cash equivalents	$	1,430.0	$	—	$	—	$	1,430.0
Available-for-sale securities:
General obligation municipal bonds		1,694.0		14.0		(4.3)		1,703.7
Pre-refunded municipal bonds(1)		101.7		1.0		—		102.7
Revenue municipal bonds		960.7		6.1		(3.2)		963.6
Variable rate demand notes		825.6		—		—		825.6
Total available-for-sale securities		3,582.0		21.1		(7.5)		3,595.6
Other		12.7		1.5		—		14.2
Total funds held for clients and corporate investments	$	5,024.7	$	22.6	$	(7.5)	$	5,039.8

(1) Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

Included in money market securities and other cash equivalents as of May 31, 2016 are money market funds and bank demand deposit accounts.  As of May 31, 2015 money market securities and other cash equivalents included money market funds, bank demand deposit accounts, short-term municipal bonds and commercial paper. 

46

Classification of investments on the Consolidated Balance Sheets is as follows:

	May 31,
In millions	2016		2015
Funds held for clients	$	3,997.5	$	4,273.4
Corporate investments		220.6		366.6
Long-term corporate investments		441.1		399.8
Total funds held for clients and corporate investments	$	4,659.2	$	5,039.8

The Company’s available-for-sale securities reflected a net unrealized gain of $47.6 million as of May 31, 2016 compared with a net unrealized gain of $13.6 million as of May 31, 2015. Included in the net unrealized gain total as of May 31, 2016 and May 31, 2015, there were 63 and 280 available-for-sale securities in an unrealized loss position, respectively. The available-for-sale securities in an unrealized loss position were as follows:

	May 31, 2016
	Securities in an unrealized  loss position for less than  twelve months				Securities in an unrealized  loss position for more than  twelve months				Total
	Gross				Gross				Gross
	unrealized		Fair		unrealized		Fair		unrealized		Fair
In millions	losses		value		losses		value		losses		value
Type of issue:
Corporate bonds		(0.1)		14.7		—		—		(0.1)		14.7
General obligation municipal bonds	$	(0.1)	$	48.9	$	—	$	2.8	$	(0.1)	$	51.7
Pre-refunded municipal bonds		—		5.7		—		—		—		5.7
Revenue municipal bonds		—		20.7		(0.2)		11.7		(0.2)		32.4
U.S. government agency securities		(0.3)		51.1		—		—		(0.3)		51.1
Total	$	(0.5)	$	141.1	$	(0.2)	$	14.5	$	(0.7)	$	155.6

	May 31, 2015
	Securities in an unrealized  loss position for less than  twelve months				Securities in an unrealized  loss position for more than  twelve months				Total
	Gross				Gross				Gross
	unrealized		Fair		unrealized		Fair		unrealized		Fair
In millions	losses		value		losses		value		losses		value
Type of issue:
General obligation municipal bonds	$	(3.8)	$	535.1	$	(0.5)	$	26.3	$	(4.3)	$	561.4
Revenue municipal bonds		(3.2)		361.6		—		—		(3.2)		361.6
Total	$	(7.0)	$	896.7	$	(0.5)	$	26.3	$	(7.5)	$	923.0

The Company regularly reviews its investment portfolios to determine if any investment is other-than-temporarily impaired due to changes in credit risk or other potential valuation concerns. The Company believes that the investments held as of May 31, 2016 that had unrealized losses of $0.7 million were not other-than-temporarily impaired. The Company believes that it is probable that the principal and interest will be collected in accordance with contractual terms, and that the unrealized losses on these securities were due to changes in interest rates and were not due to increased credit risk or other valuation concerns. A significant portion of the securities in an unrealized loss position as of May 31, 2016 and May 31, 2015 held an AA rating or better. The Company does not intend to sell these investments until the recovery of their amortized cost basis or maturity, and further believes that it is not more-likely-than-not that it will be required to sell these investments prior to that time. The Company’s assessment that an investment is not other-than-temporarily impaired could change in the future due to new developments or changes in the Company’s strategies or assumptions related to any particular investment.

47

Realized gains and losses from the sale of available-for-sale securities were as follows:

	Year ended May 31,
In millions	2016		2015		2014
Gross realized gains	$	0.1	$	0.3	$	0.6
Gross realized losses		—		—		—
Net realized gains	$	0.1	$	0.3	$	0.6

The amortized cost and fair value of available-for-sale securities that had stated maturities as of May 31, 2016 are shown below by contractual maturity. Expected maturities can differ from contractual maturities because borrowers may have the right to prepay obligations without prepayment penalties.

	May 31, 2016
	Amortized		Fair
In millions	cost		value
Maturity date:
Due in one year or less	$	359.6	$	360.7
Due after one year through three years		742.7		749.4
Due after three years through five years		918.5		935.7
Due after five years		2,073.5		2,096.1
Total	$	4,094.3	$	4,141.9

Variable rate demand notes are primarily categorized as due after five years in the table above as the contractual maturities on these securities are typically 20 to 30 years. Although these securities are issued as long-term securities, they are priced and traded as short-term instruments because of the liquidity provided through the tender feature.

Note G — Fair Value Measurements

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. The accounting standards related to fair value measurements include a hierarchy for information and valuations used in measuring fair value that is broken down into three levels based on reliability, as follows:

· Level 1 valuations are based on quoted prices in active markets for identical instruments that the Company can access at the measurement date.

· Level 2 valuations are based on inputs other than quoted prices included in Level 1 that are observable for the instrument, either directly or indirectly, for substantially the full term of the asset or liability including the following:

o quoted prices for similar, but not identical, instruments in active markets;

o quoted prices for identical or similar instruments in markets that are not active;

o inputs other than quoted prices that are observable for the instrument; or

o inputs that are derived principally from or corroborated by observable market data by correlation or other means.

· Level 3 valuations are based on information that is unobservable and significant to the overall fair value measurement.

The carrying values of cash and cash equivalents, accounts receivable, net of allowance for doubtful accounts, and accounts payable approximate fair value due to the short maturities of these instruments. Marketable securities included in funds held for clients and corporate investments consist primarily of securities classified as available-for-sale and are recorded at fair value on a recurring basis.

48

The Company’s financial assets and liabilities measured at fair value on a recurring basis were as follows:

	May 31, 2016
			Quoted		Significant
			prices in		other		Significant
	Carrying		active		observable		unobservable
	value		markets		inputs		inputs
In millions	(Fair value)		(Level 1)		(Level 2)		(Level 3)
Assets:
Available-for-sale securities:
Corporate bonds	$	131.2	$	—	$	131.2	$	—
General obligation municipal bonds		1,621.6		—		1,621.6		—
Pre-refunded municipal bonds		61.6		—		61.6		—
Revenue municipal bonds		931.8		—		931.8		—
U.S. government agency securities		161.1		—		161.1		—
Variable rate demand notes		1,234.6		—		1,234.6		—
Total available-for-sale securities	$	4,141.9	$	—	$	4,141.9	$	—
Other	$	14.9	$	14.9	$	—	$	—
Liabilities:
Other long-term liabilities	$	14.9	$	14.9	$	—	$	—

	May 31, 2015
			Quoted		Significant
			prices in		other		Significant
	Carrying		active		observable		unobservable
	value		markets		inputs		inputs
In millions	(Fair value)		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash equivalents:
Commercial paper	$	15.0	$	—	$	15.0	$	—
General obligation municipal bonds		55.1		—		55.1		—
Pre-refunded municipal bonds		20.5		—		20.5		—
Revenue municipal bonds		12.3		—		12.3		—
Money market securities		0.2		0.2		—		—
Total cash equivalents	$	103.1	$	0.2	$	102.9	$	—
Available-for-sale securities:
General obligation municipal bonds	$	1,703.7	$	—	$	1,703.7	$	—
Pre-refunded municipal bonds		102.7		—		102.7		—
Revenue municipal bonds		963.6		—		963.6		—
Variable rate demand notes		825.6		—		825.6		—
Total available-for-sale securities	$	3,595.6	$	—	$	3,595.6	$	—
Other	$	14.2	$	14.2	$	—	$	—
Liabilities:
Other long-term liabilities	$	14.2	$	14.2	$	—	$	—

In determining the fair value of its assets and liabilities, the Company predominately uses the market approach.  Money market securities, which are cash equivalents, are valued based on quoted market prices in active markets.  Time deposits are considered Level 1 investments as they are highly liquid and have a short maturity period, usually no longer than overnight.  Commercial paper is included in Level 2 because it may not trade on a daily basis.  Available-for-sale securities, including municipal bonds, corporate bonds, and U.S. government agency securities, and short-term municipal bonds and short-term U.S. government agency securities with a maturity of less than 90 days included in Level 2 are valued utilizing inputs obtained from an independent pricing service. To determine the fair value of the Company’s Level 2 available-for-sale securities, a variety of inputs are utilized, including benchmark yields, reported trades, non-binding broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data, new issue data, and monthly payment information. The Company has not adjusted the prices obtained from the independent pricing service because it believes that they are appropriately valued.

49

Assets included as other are mutual fund investments, consisting of participants’ eligible deferral contributions under the Company’s non-qualified and unfunded deferred compensation plans. The related liability is reported as other long-term liabilities. The mutual funds are valued based on quoted market prices in active markets.

The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, although the Company believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

Note H — Property and Equipment, Net of Accumulated Depreciation

The components of property and equipment, at cost, consisted of the following:

	May 31,
In millions	2016		2015
Land and improvements	$	8.3	$	8.3
Buildings and improvements		103.0		102.1
Data processing equipment		196.1		190.9
Software		447.5		391.8
Furniture, fixtures, and equipment		125.0		145.6
Leasehold improvements		108.2		106.2
Construction in progress		24.1		28.5
Total property and equipment, gross		1,012.2		973.4
Less: Accumulated depreciation		659.2		619.5
Property and equipment, net of accumulated depreciation	$	353.0	$	353.9

Depreciation expense was $99.2 million, $92.1 million, and $89.1 million for fiscal years 2016, 2015, and 2014, respectively.

Note I — Goodwill and Intangible Assets, Net of Accumulated Amortization

The Company had goodwill balances on its Consolidated Balance Sheets of $657.1 million as of May 31, 2016, and $561.5 million as of May 31, 2015. The increase of $95.6 million in goodwill since May 31, 2015 was the result of the acquisition of substantially all of the net assets of Advance Partners by a wholly owned subsidiary of the Company in December 2015. 

The Company has certain intangible assets with finite lives. The components of intangible assets, at cost, consisted of the following:

	May 31,
In millions	2016		2015
Client lists	$	289.2	$	244.6
Other intangible assets		5.4		3.2
Total intangible assets, gross		294.6		247.8
Less: Accumulated amortization		225.1		215.4
Intangible assets, net of accumulated amortization	$	69.5	$	32.4

During fiscal 2016, the Company acquired intangible assets with weighted-average amortization periods as follows: customer lists —9.7 years; other intangible assets —5.0 years; and total —9.5 years.  Amortization expense relating to intangible assets was $15.9 million, $14.5 million, and $15.9 million for fiscal years 2016, 2015, and 2014, respectively.

50

The estimated amortization expense for the next five fiscal years relating to intangible asset balances is as follows:

In millions	Estimated amortization
Year ending May 31,	expense
2017	$	17.7
2018		14.1
2019		11.1
2020		8.5
2021		6.5

Note J — Income Taxes

The components of deferred tax assets and liabilities are as follows:

	May 31,
In millions	2016		2015
Deferred tax assets:
Compensation and employee benefit liabilities	$	21.4	$	20.9
Other current liabilities		7.9		6.9
Tax credit carry forward		40.0		40.1
Depreciation		8.8		11.9
Stock-based compensation		22.0		21.6
Tax benefit of uncertain tax positions		18.6		15.7
Other		7.1		9.2
Gross deferred tax assets		125.8		126.3
Deferred tax liabilities:
Capitalized software		56.3		53.6
Depreciation		2.5		3.8
Goodwill and intangible assets		58.5		52.0
Revenue not subject to current taxes		13.3		13.1
Unrealized gains on available-for-sale securities		17.3		5.3
Other		—		0.3
Gross deferred tax liabilities		147.9		128.1
Net deferred tax liability	$	(22.1)	$	(1.8)

The deferred tax asset related to tax credit carry forward consists of alternative minimum tax credits, which may be carried forward indefinitely.

The components of the provision for income taxes are as follows:

	Year ended May 31,
In millions	2016		2015		2014
Current:
Federal	$	336.4	$	341.4	$	314.5
State		50.8		47.8		51.0
Total current		387.2		389.2		365.5
Deferred:
Federal		5.5		(5.1)		(3.5)
State		1.6		1.0		(1.4)
Total deferred		7.1		(4.1)		(4.9)
Income taxes	$	394.3	$	385.1	$	360.6

51

A reconciliation of the U.S. federal statutory tax rate to the Company’s effective income tax rate is as follows:

	Year ended May 31,
	2016		2015		2014
Federal statutory tax rate	35.0	%	35.0	%	35.0	%
Increase/(decrease) resulting from:
State income taxes, net of federal tax benefit	3.0	%	3.0	%	3.3	%
Section 199 - Qualified production activities	(2.4)	%	—	%	—	%
Tax-exempt municipal bond interest	(1.4)	%	(1.5)	%	(1.5)	%
Other items	0.1	%	(0.2)	%	(0.3)	%
Effective income tax rate	34.3	%	36.3	%	36.5	%

During fiscal 2016, the Company engaged tax specialists to assess the qualification of its customer-facing computer software for the federal “Qualified Production Activities Deduction” under Internal Revenue Code Section 199, and the regulations thereunder.  Based on this assessment, the Company concluded that certain of its software offerings qualified for this tax deduction for fiscal 2016 and prior tax years that remain open to IRS examination.  The Company submitted claims to recover these tax benefits for prior tax years and will claim the fiscal 2016 tax benefits when it files its fiscal 2016 tax return.  Accordingly, the Company recognized the tax benefits, and related tax reserves, for its qualified customer-facing activities in these years in fiscal 2016.   

Uncertain income tax positions:  The Company is subject to U.S. federal income tax, numerous local and state tax jurisdictions within the U.S., and income taxes in Germany.  The Company maintains a reserve for uncertain tax positions. As of May 31, 2016 and May 31, 2015, the total reserve for uncertain tax positions, including interest and net of federal benefits, was $54.2 million and $29.1 million, respectively, and were included in long-term liabilities on the Consolidated Balance Sheets.

A reconciliation of the beginning and ending amounts of the Company’s gross unrecognized tax benefits, not including interest or other potential offsetting effects, is as follows:

	Year ended May 31,
In millions	2016		2015		2014
Balance as of beginning of fiscal year	$	39.9	$	40.0	$	26.7
Additions for tax positions of the current year		7.3		6.7		11.2
Additions for tax positions of prior years		20.7		0.8		4.2
Reductions for tax positions of prior years		(0.1)		(0.4)		(1.8)
Settlements with tax authorities		(2.2)		(1.2)		—
Expiration of the statute of limitations		(0.9)		(6.0)		(0.3)
Balance as of end of fiscal year	$	64.7	$	39.9	$	40.0

The reserve as of May 31, 2016 substantially relates to the Company’s uncertain tax positions for certain federal and state income tax matters.  The Company believes the reserve for uncertain tax positions, including interest and net of federal benefits, of $54.2 million as of May 31, 2016 adequately covers open tax years and uncertain tax positions up to and including fiscal 2016 for major taxing jurisdictions. As of May 31, 2016 and May 31, 2015, the entire $54.2 million and $29.1 million, respectively, of unrecognized tax benefits, if recognized, would impact the Company’s effective income tax rate.

The Company has concluded all U.S. federal income tax matters through the fiscal year ended May 31, 2011. Fiscal years 2012 through 2014 are currently under audit by the IRS and fiscal years 2015 and 2016 are subject to potential audit. With limited exception, state income tax audits by taxing authorities are closed through the fiscal year ended May 31, 2011, primarily due to expiration of the statute of limitations.

The Company continues to follow its policy of recognizing interest and penalties accrued on tax positions as a component of income taxes on the Consolidated Statements of Income and Comprehensive Income. The amount of accrued interest and penalties associated with the Company’s tax positions is immaterial to the Consolidated Balance Sheets. The amount of interest and penalties recognized for fiscal years 2016, 2015, and 2014 was immaterial to the Company’s results of operations.

52

Note K — Accumulated Other Comprehensive Income

The change in unrealized gains and losses, net of applicable taxes, related to available-for-sale securities is the primary component reported in accumulated other comprehensive income in the Consolidated Balance Sheets. The changes in accumulated other comprehensive income are as follows:

	Year ended May 31,
In millions	2016		2015		2014
Beginning balance	$	7.5	$	21.5	$	22.0
Other comprehensive income/(loss):
Unrealized holding gains/(losses)		34.2		(21.5)		0.3
Income tax (expense)/benefit related to unrealized holding gains/(losses)		(12.4)		7.7		(0.4)
Reclassification adjustment for the net gain on sale of available-for-sale    securities realized in net income		(0.1)		(0.3)		(0.6)
Income tax expense on reclassification adjustment for the net gain on    sale of available-for-sale securities		—		0.1		0.2
Total other comprehensive income/(loss), net of tax		21.7		(14.0)		(0.5)
Ending balance	$	29.2	$	7.5	$	21.5
Total tax expense/(benefit) included in other comprehensive income/(loss)	$	12.4	$	(7.8)	$	0.2

Reclassification adjustments out of accumulated other comprehensive income are for realized gains on the sales of available-for-sale securities and impacted interest on funds held for clients on the Consolidated Statements of Income and Comprehensive Income.

Note L — Supplemental Cash Flow Information

Income taxes paid were $369.9 million, $372.8 million, and $317.8 million for fiscal years 2016, 2015, and 2014, respectively.

Lease incentives received in the form of tenant allowances and free rent were $4.3 million, $8.5 million, and $6.7 million for fiscal years 2016, 2015, and 2014, respectively.

Note M — Employee Benefit Plans

401(k) plan:  The Company maintains a contributory savings plan that qualifies under section 401(k) of the Internal Revenue Code. The Paychex, Inc. 401(k) Incentive Retirement Plan (the “Plan”) allows all employees to immediately participate in the salary deferral portion of the Plan, contributing up to a maximum of 50% of their salary, subject to Internal Revenue Service limitations. Employees who have completed one year of service and a minimum of 1,000 hours worked are eligible to receive a company matching contribution, when such contribution is in effect.  The Company provided matching contributions of 50% of up to 8% of eligible pay that an employee contributed to the Plan, effective for pay dates on or after November 15, 2013 and 50% of up to 6% of eligible pay that an employee contributed to the Plan between February 2012 and November 2013.  Company contributions to the Plan for fiscal years 2016, 2015, and 2014 were $21.4 million, $19.6 million, and $16.4 million, respectively.

The Plan is 100% participant directed. Plan participants can fully diversify their portfolios by choosing from any or all investment fund choices in the Plan. Transfers in and out of investment funds, including the Paychex, Inc. Employee Stock Ownership Plan (“ESOP”) Stock Fund, are not restricted, with the exception of certain restricted trading periods for individuals designated as insiders as specified in the Company’s Insider Trading Policy. The Company match contribution, when in effect, follows the same fund elections as the employee compensation deferrals.

53

Deferred compensation plans:  The Company offers non-qualified and unfunded deferred compensation plans to a select group of key employees, executive officers, and outside directors. Eligible employees are provided with the opportunity to defer up to 50% of their annual base salary and bonus and outside directors may defer 100% of their Board cash compensation. Gains and losses are credited based on the participant’s election of a variety of investment choices. The Company does not match any participant deferral or guarantee its return. Distributions are paid at one of the following dates selected by the participant: the participant’s termination date, the date the participant retires from any active employment, or a designated specific date.  The amounts accrued under these plans were $14.9 million and $14.2 million as of May 31, 2016 and May 31, 2015, respectively, and are reflected in other long-term liabilities on the accompanying Consolidated Balance Sheets.

Note N — Commitments and Contingencies

Lines of credit:  As of May 31, 2016, the Company had unused borrowing capacity available under uncommitted, secured, short-term lines of credit at market rates of interest with financial institutions as follows:

Financial institution	Amount available	Expiration date
JP Morgan Chase Bank, N.A.	$350 million	February 27, 2017
Bank of America, N.A.	$250 million	February 28, 2017
PNC Bank, National Association	$150 million	February 27, 2017
Wells Fargo Bank, National Association	$150 million	February 27, 2017

The credit facilities are evidenced by promissory notes and are secured by separate pledge security agreements by and between Paychex and each of the financial institutions (the “Lenders”), pursuant to which the Company has granted each of the Lenders a security interest in certain investment securities accounts. The collateral is maintained in a pooled custody account pursuant to the terms of a control agreement and is to be administered under an intercreditor agreement among the Lenders. Under certain circumstances, individual Lenders may require that collateral be transferred from the pooled account into segregated accounts for the benefit of such individual Lenders.

The primary uses of the lines of credit would be to meet short-term funding requirements related to deposit account overdrafts and client fund obligations arising from electronic payment transactions on behalf of clients in the ordinary course of business, if necessary. No amounts were outstanding against these lines of credit during fiscal 2016 or as of May 31, 2016.

Certain of the financial institutions are also parties to the Company’s credit facility and irrevocable standby letters of credit, which are discussed below.

Credit facilities:  On August 5, 2015, the Company entered into a committed, unsecured, five-year syndicated credit facility, expiring on August 5, 2020.  Under the credit facility, Paychex of New York LLC (the “Borrower”) may, subject to certain restrictions, borrow up to $1 billion to meet short-term funding requirements.  The obligations under this facility have been guaranteed by the Company and certain of its subsidiaries.  The outstanding obligations under this credit facility will bear interest at competitive rates to be elected by the Borrower.  Upon expiration of the commitment in August 2020, any borrowings outstanding will mature and be payable on such date.  This agreement supersedes the $750 million credit facility agreement set to expire on June 21, 2018, which was terminated as part of the new agreement.

There were no amounts outstanding under this credit facility as of May 31, 2016.  During fiscal 2016,  the Company borrowed against this facility, and its predecessor facility, for one-day periods each, from one to two times a quarter as follows:

$ in millions	2016				2015
Number of days borrowed		5			2
Maximum amount borrowed	$	450.0		$	150.0
Average amount borrowed	$	305.0		$	125.0
Weighted-average interest rate		3.39	%		3.25	%

The Company subsequently borrowed $100 million for one day under this line in June 2016.

The credit facility contains various financial and operational covenants that are usual and customary for such arrangements.  The Borrower was in compliance with these covenants during fiscal 2016. 

54

Certain lenders under this credit facility, and their respective affiliates, have performed, and may in the future perform for the Company and its subsidiaries, various commercial banking, investment banking, underwriting, and other financial advisory services, for which they have received, and will continue to receive in the future, customary fees and expenses.

In March 2016, the Company entered into a committed, unsecured, three-year credit facility with PNC Bank, National Association, expiring on March 17, 2019.   Under the credit facility, Paychex Advance LLC may, subject to certain restrictions, borrow up to $150 million to finance working capital needs and general corporate purposes.  The obligations under this facility have been guaranteed by the Company and certain of its subsidiaries.  The outstanding obligations under this credit facility will bear interest at competitive rates to be elected by the Borrower.  Upon expiration of the commitment in March 2019, any borrowings outstanding will mature and be payable on such date.

There were no amounts outstanding under this credit facility as of May 31, 2016.  Paychex Advance subsequently borrowed approximately $56 million under this line, which remains outstanding as of the date of this report.

Letters of credit:  The Company had irrevocable standby letters of credit outstanding totaling $43.0 million both as of May 31, 2016 and May 31, 2015, required to secure commitments for certain insurance policies. The letters of credit expire at various dates between July 2016 and April 2017, and are collateralized by securities held in the Company’s investment portfolios. No amounts were outstanding on these letters of credit during fiscal 2016 or as of May 31, 2016. Subsequent to May 31, 2016, the letter of credit expiring in July 2016 was renewed through July 2017.

Contingencies:   The Company is subject to various claims and legal matters that arise in the normal course of its business. These include disputes or potential disputes related to breach of contract, tort, breach of fiduciary duty, employment-related claims, tax claims, and other matters.

The Company’s management currently believes that resolution of outstanding legal matters will not have a material adverse effect on the Company’s financial position or results of operations. However, legal matters are subject to inherent uncertainties and there exists the possibility that the ultimate resolution of these matters could have a material adverse impact on the Company’s financial position and the results of operations in the period in which any such effect is recorded.

Lease commitments:  The Company leases office space and data processing equipment under terms of various operating leases. Rent expense for fiscal years 2016, 2015, and 2014 was $39.8 million, $39.4 million, and $39.1 million, respectively. As of May 31, 2016, future minimum lease payments under various non-cancelable operating leases with terms of more than one year are as follows:

		Minimum
In millions		lease
Year ending May 31,		payments
2017	$	35.7
2018		28.5
2019		20.0
2020		12.9
2021		7.4
Thereafter		2.2

55

Other commitments:    As of May 31, 2016, the Company had outstanding commitments under purchase orders and legally binding contractual arrangements with minimum future payment obligations of approximately $109.6 million, including $6.8 million of commitments to purchase capital assets. These minimum future payment obligations relate to the following fiscal years:

	Minimum
In millions	payment
Year ending May 31,	obligation
2017	$	73.5
2018		20.5
2019		7.6
2020		4.4
2021		3.0
Thereafter		0.6

In the normal course of business, the Company makes representations and warranties that guarantee the performance of services under service arrangements with clients. Historically, there have been no material losses related to such guarantees. In addition, the Company has entered into indemnification agreements with its officers and directors, which require the Company to defend and, if necessary, indemnify these individuals for certain pending or future claims as they relate to their services provided to the Company.

Paychex currently self-insures the deductible portion of various insured exposures under certain employee benefit plans. The Company’s estimated loss exposure under these insurance arrangements is recorded in other current liabilities on the Consolidated Balance Sheets. Historically, the amounts accrued have not been material and are not material as of the reporting date. The Company also maintains insurance coverage in addition to its purchased primary insurance policies for gap coverage for employment practices liability, errors and omissions, warranty liability, theft and embezzlement, cyber threats, and acts of terrorism; and capacity for deductibles and self-insured retentions through its captive insurance company.

Note O — Related Parties

During fiscal years 2016, 2015, and 2014, the Company purchased approximately $4.9 million, $6.9 million, and $4.7 million, respectively, of data processing equipment and software from EMC Corporation. The Chairman, President, and Chief Executive Officer of EMC Corporation is a member of the Company’s Board.

During fiscal years 2016, 2015, and 2014, the Company purchased approximately $2.3 million, $1.7 million, and $1.3 million, respectively, of office supplies from Staples, Inc. The Vice Chairman of Staples, Inc. is a member of the Company’s Board.

56

Note P — Quarterly Financial Data (Unaudited)

In millions, except per share amounts

	Three Months Ended
Fiscal 2016	August 31		November 30		February 29		May 31		Full Year
Service revenue	$	712.2	$	711.3	$	740.7	$	741.6	$	2,905.8
Interest on funds held for clients		10.8		11.1		11.9		12.3		46.1
Total revenue	$	723.0	$	722.4	$	752.6	$	753.9	$	2,951.9
Operating income	$	296.1	$	294.2	$	280.0	$	276.3	$	1,146.6
Investment income/(loss), net		1.4		1.6		1.7		(0.2)		4.5
Income before income taxes		297.5		295.8		281.7		276.1		1,151.1
Income taxes		88.4		106.6		101.3		98.0		394.3
Net income	$	209.1	$	189.2	$	180.4	$	178.1	$	756.8
Basic earnings per share(1)	$	0.58	$	0.52	$	0.50	$	0.49	$	2.10
Diluted earnings per share(1)	$	0.58	$	0.52	$	0.50	$	0.49	$	2.09
Weighted-average common shares    outstanding		361.1		360.7		360.5		360.3		360.7
Weighted-average common shares    outstanding, assuming dilution		362.8		362.3		362.2		360.7		362.5
Cash dividends per common share	$	0.42	$	0.42	$	0.42	$	0.42	$	1.68
Total net realized gains(2)	$	—	$	—	$	0.1	$	—	$	0.1

	Three Months Ended
Fiscal 2015	August 31		November 30		February 28		May 31		Full Year
Service revenue	$	656.6	$	665.9	$	693.6	$	681.4	$	2,697.5
Interest on funds held for clients		10.2		10.4		10.7		10.8		42.1
Total revenue	$	666.8	$	676.3	$	704.3	$	692.2	$	2,739.6
Operating income	$	267.5	$	270.2	$	264.3	$	251.6	$	1,053.6
Investment income, net		1.4		1.4		1.6		2.0		6.4
Income before income taxes		268.9		271.6		265.9		253.6		1,060.0
Income taxes		97.6		98.6		96.5		92.4		385.1
Net income	$	171.3	$	173.0	$	169.4	$	161.2	$	674.9
Basic earnings per share(1)	$	0.47	$	0.48	$	0.47	$	0.44	$	1.86
Diluted earnings per share(1)	$	0.47	$	0.47	$	0.46	$	0.44	$	1.85
Weighted-average common shares    outstanding		363.1		363.0		363.2		362.3		362.9
Weighted-average common shares    outstanding, assuming dilution		364.7		364.6		365.0		364.5		364.6
Cash dividends per common share	$	0.38	$	0.38	$	0.38	$	0.38	$	1.52
Total net realized gains(2)	$	0.1	$	0.1	$	—	$	0.1	$	0.3

(1) Each quarter is a discrete period and the sum of the four quarters’ basic and diluted earnings per share amounts may not equal the full year amount.

(2) Total net realized gains on the combined funds held for clients and corporate investment portfolios.

57

Schedule II — Valuation and Qualifying Accounts

PAYCHEX, INC.

CONSOLIDATED FINANCIAL STATEMENT SCHEDULE

FOR THE YEAR ENDED MAY 31,

(In millions)

					Additions to/
	Balance as of		Additions		(Deductions				Balance as
	beginning		charged to		from) other		Costs and		of end
Description	of fiscal year		expenses		accounts(1)		deductions(2)		of fiscal year
2016
Allowance for doubtful accounts	$	1.4	$	2.5	$	2.0	$	1.7	$	4.2
Reserve for client fund losses	$	1.8	$	2.4	$	—	$	2.2	$	2.0
2015
Allowance for doubtful accounts	$	1.5	$	1.6	$	0.1	$	1.8	$	1.4
Reserve for client fund losses	$	1.9	$	2.0	$	(0.2)	$	1.9	$	1.8
2014
Allowance for doubtful accounts	$	1.0	$	2.5	$	—	$	2.0	$	1.5
Reserve for client fund losses	$	2.4	$	2.2	$	—	$	2.7	$	1.9

(1) Amounts related to business acquisitions.

(2) Uncollectible amounts written off, net of recoveries.

Item 9.Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A.Controls and Procedures

Disclosure Controls and Procedures:    Disclosure controls and procedures are designed with the objective of ensuring that information required to be disclosed in the Company’s reports filed under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), such as this report, is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures are also designed with the objective of ensuring that such information is accumulated and communicated to the Company’s management, including the Company’s principal executive officer and principal financial officer, as appropriate, to allow timely decisions regarding required disclosure.

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures:    As of the end of the period covered by this report, the Company carried out an evaluation, under the supervision and with the participation of the Company’s principal executive officer and principal financial officer, of the effectiveness of disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act. Based on such evaluation, the Company’s principal executive officer and principal financial officer have concluded that as of May 31, 2016, the end of the period covered by this report, the Company’s disclosure controls and procedures were effective.

Changes in Internal Control Over Financial Reporting:    The Company also carried out an evaluation of the internal control over financial reporting to determine whether any changes occurred during the quarter ended May 31, 2016. Based on such evaluation, there have been no changes in the Company’s internal control over financial reporting that occurred during the Company’s most recently completed fiscal quarter ended May 31, 2016, that materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

Internal Control Over Financial Reporting:  The Report on Management’s Assessment of Internal Control Over Financial Reporting and the Report of Independent Registered Public Accounting Firm are incorporated herein by reference from Part II, Item 8 of this Form 10-K.

58

Item 9B.Other Information

None.

PART III

Item 10.Directors, Executive Officers and Corporate Governance

The following table shows the executive officers of the Company as of May 31, 2016, and information regarding their positions and business experience. Such executive officers hold principal policy-making powers at the Company.

Name	Age	Position and business experience
Martin Mucci	56	Mr. Mucci has served as President and Chief Executive Officer of the Company since September 2010. Mr. Mucci joined the Company in 2002 as Senior Vice President, Operations. Prior to joining Paychex, he held senior level positions with Frontier Telephone of Rochester, a telecommunications company, during his 20-year career. Mr. Mucci was a director of Cbeyond, Inc. until it was purchased by Birch Communications in July 2014. He is a member of the Upstate New York Regional Advisory Board of the Federal Reserve Bank of New York and is a Trustee Emeritus of St. John Fisher College. He also serves as a director of the Company and is chairman of the Executive Committee.
Efrain Rivera	59	Mr. Rivera joined Paychex in June 2011 as Senior Vice President, Chief Financial Officer, and Treasurer. Prior to joining the Company, Mr. Rivera served as Vice President of Finance and Administration for Houghton College since 2009. He previously served for over twenty years with Bausch & Lomb Incorporated, a world leader in the development, manufacture, and marketing of eye health products, most recently as Corporate Vice President and Chief Financial Officer from 2007 to 2009.
Mark A. Bottini	55	Mr. Bottini joined Paychex in October 2011 as Senior Vice President of Sales. From 2008 to 2011, Mr. Bottini served as Vice President of Sales for Ricoh, North America, a provider of advanced office technology and innovative document imaging products, services, and software. He assumed his most recent position with Ricoh when Ricoh acquired IKON Office Solutions, Inc. During his nearly 20 years with IKON, Mr. Bottini served in a variety of sales leadership and field management roles.
John B. Gibson	50	Mr. Gibson joined Paychex in May 2013 as Senior Vice President of Service.  Prior to joining the Company, Mr. Gibson served as President and Chief Executive Officer for AlphaStaff, a national provider of human resource outsourcing services to small- and medium-sized businesses.  Prior to joining AlphaStaff in 2010, Mr. Gibson was President of the HR Management Division of Convergys, a global leader in technology, outsourcing, and business services.  From 2004 to 2007, he served as Senior Vice President of Global Operations and Client Services of Convergys.
Michael E. Gioja	58	Mr. Gioja was named Senior Vice President of Information Technology, Product Management, and Development in July 2011. Mr. Gioja has been with the Company since November 2008 as Vice President of Product Management, subsequently adding development and information technology to his responsibilities. Previously, he was Chief Information Officer and Executive Vice President of Products and Services for Workstream, Inc., a provider of on-demand enterprise talent management solutions and services.

59

Name	Age	Position and business experience
Stephanie L. Schaeffer	46	Ms. Schaeffer was named Vice President and Chief Legal Officer in January 2006.  In 2011, she was appointed Corporate Secretary.  She joined Paychex in 2000 as Corporate Counsel and was promoted to Director of Legal Affairs in 2004. In her current role, she is responsible for overseeing all of the Company's legal functions, including litigation, corporate governance, and regulatory matters.
Jennifer Vossler	53	Ms. Vossler joined the Company in May 2009 as Vice President and Controller. Prior to joining the Company, she served as Vice President and Corporate Controller, and held various executive and senior management positions during her eleven years at Bausch & Lomb Incorporated. Previously in her career, she held leadership roles with a global facilities management outsourcing company and a public accounting firm.
Laurie L. Zaucha	51	Ms. Zaucha joined the Company in March 2011 and was named Vice President of Human Resources and Organizational Development. Prior to joining the Company, she served as Senior Vice President of Human Resources for Paetec Holding Corp., a Fortune 1000 telecommunications company, from 2007 to 2011. From 2003 to 2007, she held various executive positions at Bausch & Lomb Incorporated.

The additional information required by this item is set forth in the Company’s Definitive Proxy Statement for its 2016 Annual Meeting of Stockholders, anticipated to be held on or about October 12, 2016, in the sections “PROPOSAL 1 — ELECTION OF DIRECTORS FOR A ONE-YEAR TERM,” “SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE,” “CORPORATE GOVERNANCE,” and “CODE OF BUSINESS ETHICS AND CONDUCT” and is incorporated herein by reference.

Item 11.Executive Compensation

The information required by this item is set forth in the Company’s Definitive Proxy Statement for its 2016 Annual Meeting of Stockholders, anticipated to be held on or about October 12, 2016, in the sections “COMPENSATION DISCUSSION AND ANALYSIS,” “NAMED EXECUTIVE OFFICER COMPENSATION,” and “DIRECTOR COMPENSATION FOR THE FISCAL YEAR ENDED MAY 31, 2016,” and is incorporated herein by reference.

Item 12.Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The information required by this item is set forth in the Company’s Definitive Proxy Statement for its 2016 Annual Meeting of Stockholders, anticipated to be held on or about October 12, 2016, under the sections  “SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE,” and is incorporated herein by reference.

Item 13.Certain Relationships and Related Transactions, and Director Independence

The information required by this item is set forth in the Company’s Definitive Proxy Statement for its 2016 Annual Meeting of Stockholders, anticipated to be held on or about October 12, 2016, under the sub-headings “Board Meetings and Committees” and “Policy on Transactions with Related Persons” within the section “CORPORATE GOVERNANCE,” and is incorporated herein by reference.

Item 14.Principal Accounting Fees and Services

The information required by this item is set forth in the Company’s Definitive Proxy Statement for its 2016 Annual Meeting of Stockholders, anticipated to be held on or about October 12, 2016, under the section “PROPOSAL 3 — RATIFICATION OF SELECTION OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM,” and is incorporated herein by reference.

60

PART IV

Item 15.Exhibits and Financial Statement Schedules

(a)	Financial Statements, Financial Statement Schedules, and Exhibits
1.	Financial Statements See Financial Statements and Supplementary Data Table of Contents at page 29.
2.	Financial Statement Schedules
	Financial statement schedules required to be filed by Item 8 of this Form 10-K include Schedule II — Valuation and Qualifying Accounts. See Financial Statements and Supplementary Data Table of Contents at page 29. All other schedules are omitted as the required matter is not present, the amounts are not significant, or the information is shown in the financial statements or the notes thereto.
3.	Exhibits
	(3)(a)	Restated Certificate of Incorporation, incorporated herein by reference from Exhibit 3(a) to the Company’s Form 10-K filed with the Commission on July 20, 2004.
	(3)(b)	Bylaws, as amended, incorporated herein by reference from Exhibit 3(b) to the Company’s Form 10-K filed with the Commission on July 21, 2006.
#	(10.1)	Paychex, Inc. Qualified Employee Stock Purchase Plan, incorporated herein by reference from Exhibit 4.3 to the Company’s Registration Statement on Form S-8, No. 333-207594.
#	(10.2)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 14, 2015), incorporated herein by reference from Exhibit 4.1 to the Company’s Registration Statement on Form S-8, No. 333-207592.
#	(10.3)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 12, 2005) Award Agreement for Non-Qualified Stock Options, incorporated herein by reference from Exhibit 10.3 to the Company’s Form 8-K filed with the Commission on October 17, 2005.
#	(10.4)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 12, 2005) Form of Non-Qualified Stock Option Award Agreement, incorporated herein by reference from Exhibit 10.2 to the Company’s Form 8-K filed with the Commission on July 16, 2008.
#	(10.5)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 12, 2005) Form of Restricted Stock Unit Award Agreement, incorporated herein by reference from Exhibit 10(n) to the Company’s Form 10-K filed with the Commission on July 18, 2008.
#	(10.6)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 12, 2005) Form of Non-Qualified Stock Option Agreement for Directors, incorporated herein by reference from Exhibit 10(q) to the Company’s Form 10-K filed with the Commission on July 18, 2008.
#	(10.7)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 12, 2005) 2009 Non-Qualified Stock Option Award Agreement (Special Grant), incorporated herein by reference from Exhibit 10.17 to the Company’s Form 10-K filed with the Commission on July 20, 2009.
#	(10.8)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 12, 2005) Form of Restricted Stock Award Agreement (Officer), incorporated herein by reference from Exhibit 10.18 to the Company’s Form 10-K filed with the Commission on July 16, 2010.
#	(10.9)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 12, 2005) Form of Non-Qualified Stock Option Award Agreement (Officer), incorporated herein by reference from Exhibit 10.19 to the Company’s Form 10-K filed with the Commission on July 16, 2010.
#	(10.10)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 12, 2005) Form of Officer Performance Incentive Award Agreement (Long Term), incorporated herein by reference from Exhibit 10.20 to the Company’s Form 10-K filed with the Commission on July 16, 2010.
#	(10.11)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 13, 2010) Form of Non-Qualified Stock Option Award Agreement (Board), incorporated herein by reference from Exhibit 10.20 to the Company’s Form 10-K filed with the Commission on July 15, 2011.
#	(10.12)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 13, 2010) Form of Restricted Stock Award Agreement (Board), incorporated herein by reference from Exhibit 10.21 to the Company’s Form 10-K filed with the Commission on July 15, 2011.

61

#	(10.13)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 13, 2010) Form of Non-Qualified Stock Option Award Agreement (Officer) Long Term Incentive Program (“LTIP”), incorporated herein by reference from Exhibit 10.23 to the Company’s Form 10-K filed with the Commission on July 15, 2011.
* #	(10.14)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 14, 2015) Form of Non-Qualified Stock Option and Restricted Stock Award Agreement Long Term Incentive Program (“LTIP”).
#	(10.15)	Paychex, Inc. Change In Control Plan, incorporated herein by reference from Exhibit 10.24 to the Company’s Form 10-K filed with the Commission on July 15, 2011.
#	(10.16)	Paychex, Inc. Form of Performance Award Incentive Program, incorporated herein by reference from Exhibit 10.25 to the Company’s Form 10-K filed with the Commission on July 15, 2011.
#	(10.17)	Form of Indemnity Agreement for Directors and Officers, incorporated herein by reference from Exhibit 10.1 to the Company’s Form 10-Q filed with the Commission on March 28, 2012.
#	(10.18)	Paychex, Inc. Board Deferred Compensation Plan, incorporated herein by reference from Exhibit 10.29 to the Company’s Form 10-K filed with the Commission on July 20, 2009.
#	(10.19)	Paychex, Inc. Employee Deferred Compensation Plan, incorporated herein by reference from Exhibit 10.30 to the Company’s Form 10-K filed with the Commission on July 20, 2009.
*	(21.1)	Subsidiaries of the Registrant.
*	(23.1)	Consent of Independent Registered Public Accounting Firm, PricewaterhouseCoopers LLP.
*	(24.1)	Power of Attorney.
*	(31.1)	Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
*	(31.2)	Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
*	(32.1)	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
*	(32.2)	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
*	101.INS	XBRL instance document.
*	101.SCH	XBRL taxonomy extension schema document.
*	101.CAL	XBRL taxonomy extension calculation linkbase document.
*	101.LAB	XBRL taxonomy label linkbase document.
*	101.PRE	XBRL taxonomy extension presentation linkbase document.
*	101.DEF	XBRL taxonomy extension definition linkbase document.

* Exhibit filed with this report.

# Management contract or compensatory plan.

62

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, on July 22, 2016.

PAYCHEX,INC.

By: /s/ Martin Mucci

Martin Mucci

President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities indicated on July 22, 2016.

/s/ Martin Mucci

Martin Mucci, President and

Chief Executive Officer, and Director

(Principal Executive Officer)

/s/ Efrain Rivera

Efrain Rivera, Senior Vice President, Chief Financial Officer, and Treasurer

(Principal Financial Officer)

B. Thomas Golisano*, Chairman of the Board

Joseph G. Doody*, Director

David J. S. Flaschen*, Director

Phillip Horsley*, Director

Grant M. Inman*, Director

Pamela A. Joseph*, Director

Joseph M. Tucci*, Director

Joseph Velli*, Director

*By: /s/ Martin Mucci

Martin Mucci, as Attorney-in-Fact

63

EX-10.14

EXHIBIT 10.14

FORM OF PAYCHEX, INC.
2002 STOCK INCENTIVE PLAN

(as amended and restated effective October 14, 2015)

NON-QUALIFIED STOCK OPTION AND
RESTRICTED STOCK AWARD AGREEMENT

LONG TERM INCENTIVE PROGRAM (“LTIP”)

1.Grant of Option and Restricted Stock.  This Non-qualified Stock Option and Restricted Stock Award Agreement (the “Award Agreement”), made as of [grant date], serves to notify you that the Governance and Compensation Committee (the “Committee”) of the Board of Directors of Paychex, Inc. (the “Company”) hereby grants to you, under the Company’s 2002 Stock Incentive Plan, as amended and restated effective October 14, 2015 (the “Plan”), a Non-Qualified Stock Option (the “Option”) to purchase, on the terms and conditions set forth in this Award Agreement and the Plan, up to the number of shares of the Company’s $.01 par value common stock (the “Common Stock”) granted as Options as set forth on the attached statement (the “Maximum Number” of “Option Shares”) at the price of [exercise price]  per share (the “Exercise Price”), and an award of shares of Restricted Stock (the “Restricted Stock,” and together with the Option, the “Award”) for the number of shares of Common Stock granted as Restricted Stock as set forth on the attached statement (the “Target Number” of “Restricted Stock Shares”).  For purposes of this Award Agreement, the “Target Number of Option Shares” shall mean two-thirds (i.e., the 100% payout percentage at Target over the 150% payout percentage at Maximum) of the Maximum Number of Option Shares.  The Plan is incorporated herein by reference and made a part of this Award Agreement.  You may obtain a copy of the Plan from the Office of the Corporate Secretary.  You should review the terms of this Award Agreement and the Plan carefully.  The capitalized terms used in this Award Agreement or the attached statement are defined in the Plan.

2.Term of Option.  Unless the Option is previously terminated pursuant to the terms of this Award Agreement or the Plan, the Option will expire at the close of business on July 5, 2026 (the “Expiration Date”).

3.Vesting of Award.  Vesting is contingent on your continued employment as an executive of the Company or one of its Affiliates through the date of the Committee’s review and certification of the 2020 Service Revenue, 2020 Operating Income and 2020 EPS following completion of fiscal year 2020 (the “Vesting Date”).  If your employment as an executive of the Company or one of its Affiliatesterminates before the Vesting Date for any reason, then the Award shall be forfeited and cancelled immediately.Subject to the terms set forth in this Award Agreement and the Plan, the Award will vest (and the Option will become exercisable) as follows:

(a)Except as otherwise determined by the Committee under Section 3(b), upon the Committee’s review and certification of the 2020 Service Revenue, 2020 Operating Income and 2020 EPS following completion of fiscal year 2020:

(i)2020 Service Revenue Component.

(A)if the Service Revenue for the 2020 fiscal year equals the 2020 Service Revenue Target set forth on the attached statement, then 40% of the Target Number of Option Shares and 40% of the Target Number of Restricted Stock Shares shall vest, and

(B)if the Service Revenue for the 2020 fiscal year equals or exceeds the 2020 Service Revenue Maximum set forth on the attached statement, 60% (i.e., 150% of 40%) of the Target Number of Option Shares and 60% of the Target Number of Restricted Stock Shares shall vest, and

(C)if the Service Revenue for the 2020 fiscal year exceeds the 2020 Service Revenue Target and is less than the 2020 Service Revenue Maximum, then on or between 40% and 60% of the Target Number of Option Shares and on or between 40% and 60% of the Target Number of Restricted Stock Shares shall vest, determined using straight-line interpolation, and

(D)if the Service Revenue for the 2020 fiscal year equals the 2020 Service Revenue Threshold set forth on the attached statement, 24% (i.e., 60% of 40%) of the Target Number of Option Shares and 24% of the Target Number of Restricted Stock Shares shall vest, and

(E)if the Service Revenue for the 2020 fiscal year exceeds the 2020 Service Revenue Threshold and is less than the 2020 Service Revenue Target, then on or between 24% and 40% of the Target Number of Option Shares and on or between 24% and 40% of the Target Number of Restricted Stock Shares shall vest, determined using straight-line interpolation; and

(ii)2020 Operating Income Component.

(A)if the Operating Income for the 2020 fiscal year equals the 2020 Operating Income Target set forth on the attached statement, then 40% of the Target Number of Option Shares and 40% of the Target Number of Restricted Stock Shares shall vest, and

(B)if the Operating Income for the 2020 fiscal year equals or exceeds the 2020 Operating Income Maximum set forth on the attached statement, then 60% (i.e., 150% of 40%) of the Target Number of Option Shares and 60% of the Target Number of Restricted Stock Shares shall vest, and

(C)if the Operating Income for the 2020 fiscal year exceeds the 2020 Operating Income Target and is less than the 2020 Operating Income Maximum, then on or between 40% and 60% of the Target Number of Option Shares and on or between 40% and 60% of the Target Number of Restricted Stock Shares shall vest, determined using straight-line interpolation, and

(D)if the Operating Income for the 2020 fiscal year equals the 2020 Operating Income Threshold set forth on the attached statement, then 24% (i.e., 60% of 40%)

2

of the Target Number of Option Shares and 24% of the Target Number of Restricted Stock Shares shall vest, and

(E)if the Operating Income for the 2020 fiscal year exceeds the 2020 Operating Income Threshold and is less than the 2020 Operating Income Target, then on or between 24% and 40% of the Target Number of Option Shares and on or between 24% and 40% of the Target Number of Restricted Stock Shares shall vest, determined using straight-line interpolation; and

(iii)2020 EPS Component.

(A)if the EPS for the 2020 fiscal year equals the 2020 EPS Target set forth on the attached statement, then 20% of the Target Number of Option Shares and 20% of the Target Number of Restricted Stock Shares shall vest, and

(B)if the EPS for the 2020 fiscal year equals or exceeds the 2020 EPS Maximum set forth on the attached statement, then 30% (i.e., 150% of 20%) of the Target Number of Option Shares and 30% of the Target Number of Restricted Stock Shares shall vest, and

(C)if the EPS for the 2020 fiscal year exceeds the 2020 EPS Target and is less than the 2020 EPS Maximum, then on or between 20% and 30% of the Target Number of Option Shares and on or between 20% and 30% of the Target Number of Restricted Stock Shares shall vest, determined using straight-line interpolation, and

(D)if the EPS for the 2020 fiscal year equals the 2020 Operating Income Threshold set forth on the attached statement, then 12% (i.e., 60% of 20%) of the Target Number of Option Shares and 12% of the Target Number of Restricted Stock Shares shall vest, and

(E)if the EPS for the 2020 fiscal year exceeds the 2020 Operating Income Threshold and is less than the 2020 Operating Income Target, then on or between 12% and 20% of the Target Number of Option Shares and on or between 12% and 20% of the Target Number of Restricted Stock Shares shall vest, determined using straight-line interpolation.

(b)The Committee may, in its sole discretion, reduce, but not increase, the number of the Option Shares and/or Restricted Stock Shares that vest pursuant to Section 3(a).

(c)The number of Option Shares and Restricted Stock Shares, if any, which do not vest pursuant to this Section 3 (after the application of Section 3(b)), shall be forfeited.

“Service Revenue” and “Operating Income” for a specified period mean the Service Revenue and Operating Income, respectively, each as determined by the values reported in the Company’s annual audited financial statements for such period, but in each case excluding the following: interest on funds held for clients and/or investment income, asset write-downs or impairments; litigation or claim judgments or settlements; material changes in tax law, or other such laws or provisions affecting reported results; cumulative effect of accounting changes as defined by

3

generally accepted accounting principles, and as identified in the Company’s audited financial statements; restructuring charges; severance, contract termination and other costs related to entering or exiting certain business activities; and gains or losses from the acquisition or disposition of businesses or assets or from the early extinguishment of debt and related discontinued operations of such disposition of businesses, or other unusual or infrequently occurring items.  “EPS” shall mean the earnings per share as reported in the Company’s annual audited financial statements for such period, except that the Committee shall have discretion to adjust for unusual or infrequently occurring items.  Notwithstanding the Plan language to the contrary, results of operations from acquired businesses shall not be excluded, unless determined by the Committee.

4.Option-Specific Terms.

(a)Exercise.

(i)Method of Exercise.  The Option may be exercised to the extent of the number of vested Option Shares, in whole or in part, provided that the Option may not be exercised for less than one share of Common Stock in any single transaction.  The Option may be exercised using a method specified by the Company.

(ii)Payment of Exercise Price.  The exercise of the Option is conditioned upon your payment to the Company of the Exercise Price for the number of Option Shares that you elect to purchase.  The Exercise Price may be paid in cash or by check or by way of a broker-assisted stock option exercise program, if such a program is made available by the Company at the time of the exercise of the Option.

(iii)Withholding.  The exercise of the Option is conditioned upon your making arrangements satisfactory to the Company for the payment to the Company of the amount of all taxes required by any governmental authority to be withheld and paid over by the Company or any Affiliate to the governmental authority on account of the exercise.  The payment of such withholding taxes to the Company may be made (i) by you in cash or by check, (ii) by the Company or any Affiliate withholding such taxes from any other compensation owed to you by the Company or any Affiliate; or (iii) by way of a broker-assisted stock exercise program, if such program is made available by the Company at the time of the exercise of the Option.

(iv)Issuance of Shares.  Upon determining that compliance with this Award Agreement has occurred, including compliance with such reasonable requirements as the Company may impose pursuant to the Plan, the Company shall issue to you a certificate for the Option Shares purchased on the earliest practicable date (as determined by the Company) thereafter.

(b)Effect of Death and Disability.  In the event of your death or Disability prior to the complete exercise of the Option, the Option may be exercised to the extent of the number of vested Option Shares, in whole or in part, subject to all of the conditions on exercise imposed by the Plan and this Award Agreement, within three yearsafter the date of your death or Disability, but only (i) by you, or in the event of your death, by your estate or the person or persons to whom the Option passes under your will or the laws of descent and distribution, (ii) to the extent that the

4

Option was vested and exercisable on the date of termination, and (iii) prior to the close of business on the Expiration Date of the Option.

(c)Effect of Retirement.  Upon your Retirement prior to the complete exercise of the Option, the Option may be exercised to the extent of the number of vested Option Shares, in whole or in part, subject to all of the conditions on exercise imposed by the Plan and this Award Agreement, within three years after the date of such termination, but only (i) to the extent that the Option was vested and exercisable on the date of such termination, and (ii) prior to the close of business on the Expiration Date of the Option.  The term “Retirement” means retirement from the Company at age 55 or later with ten or more years of employment (full-time or part-time) with the Company.

(d)Effect of Other Termination.  Upon your termination for a reason other than death, Disability or Retirement prior to the complete exercise of the Option, the Option may be exercised to the extent of the number of vested Option Shares, in whole or in part, subject to all of the conditions on exercise imposed by the Plan and this Award Agreement, within one year after the date of such termination, but only prior to the close of business on the Expiration Date.  Notwithstanding the foregoing, if  your employment is terminated by reason of conduct that is determined by the Company to have been detrimental to the Company, including violation of the Company’s Code of Business Ethics, or conduct which is criminal, fraudulent, deliberately dishonest, disloyal or willful misconduct, you will forfeit any unexercised vested Option Shares as of your last day worked.

(e)Restrictions on Issuance of Shares.  If at any time the Company determines that the listing, registration or qualification of the Option Shares upon any securities exchange or under any state or federal law, or the approval of any governmental agency, is necessary or advisable as a condition to the exercise of the Option, the Option may not be exercised in whole or in part unless and until such listing, registration, qualification or approval shall have been effected or obtained free of any conditions not acceptable to the Company.

5.Restricted Stock-Specific Terms.

(f)Book-Entry Registration of Restricted Stock.  The Restricted Stock Shares initially will be evidenced by book-entry registration only for the Target Number of Restricted Stock Shares, without the issuance of a certificate representing the Restricted Stock Shares.

(g)Issuance of Common Stock.  The Company shall, when the conditions to vesting of the Restricted Stock are satisfied, issue a certificate or certificates representing the number of Restricted Stock Shares that have vested as promptly as practicable following the Vesting Date.

(h)Withholding.  The grant and the vesting of the Restricted Stock is conditioned upon your making arrangements satisfactory to the Company for the payment to the Company of the amount of all taxes required by any governmental authority to be withheld and paid over by the Company or any Affiliate to the governmental authority on account of such grant or vesting.  The payment of such withholding taxes to the Company may be made (i) by you in cash or by check, (ii) subject to the consent of the Company and in accordance with any guidelines

5

established by the Committee, by the Company retaining the number of the shares of Common Stock that would otherwise be delivered to you upon vesting of the Restricted Stock that have an aggregate Fair Market Value (at the time retained by the Company) equal to the amount of withholding taxes (using your minimum required tax withholding rate or such other rate that the Company determines will not trigger a negative accounting impact to the Company) required to be paid, or (ii) by the Company or any Affiliate withholding such taxes from any other compensation owed to you by the Company or any Affiliate.  Unless you make arrangements prior to vesting of the Restricted Stock to pay withholdings taxes in cash or by check, or to have such withholding taxes withheld from other compensation owed to you by the Company or any Affiliate, then at the time of vesting of the Restricted Stock, the Company shall have the right to retain the number of the shares of Common Stock that would otherwise be delivered to you upon vesting of the Restricted Stock that have an aggregate Fair Market Value (at the time retained by the Company) equal to the amount of withholding taxes (using your minimum required tax withholding rate or such other rate that the Company determines will not trigger a negative accounting impact to the Company) required to be paid.

6.Non-competition, Non-solicitation, Confidentiality, and Detrimental Conduct.  In consideration for the Award, you agree that during your employment and for a period of twelve (12) months following termination of employment for any reason, you will not, directly or indirectly, either as an employee, employer, consultant, agent, principal, partner, stockholder, corporate officer, board member, director, or in any other individual or representative capacity, engage or attempt to engage in any activity that is competitive to the business of the Company within the geographic and substantive area or areas of responsibility assigned to the you during the last twenty-four (24) months of employment.  In addition, you agree that for a period of eighteen (18) months following the termination of employment for any reason, you will not directly or indirectly by assisting others, solicit Company clients, prospects or referral resources; nor will you recruit or hire, or attempt to recruit or hire any other employee of the Company or its Affiliates, or induce or attempt to induce any employee of the Company to terminate employment with the Company. You also agree and acknowledge that during the course of your employment with the Company, you will obtain, have access and be privy to nonpublic information important to the Company's business solely as a result of employment with the Company, which information you hereby acknowledge and agree to be confidential (“Confidential Information”).  You agree that during and after employment, you shall not divulge or make use of any Confidential Information, directly or indirectly, personally or on behalf of any other person, business, corporation, or entity without prior written consent of the Company.  You further agree that you will not, during your employment, engage in conduct which is detrimental to the Company, including violation of the Company’s Code of Business Ethics and Conduct, criminal conduct, fraud, or willful misconduct.  These covenants are not intended to, and do not, limit in any way the rights and remedies provided to the Company under the Plan, other agreements with you, or under common or statutory law.

7.Repayment of Financial Gain.

(i)If you fail to comply with Section 6of this Award Agreement, the Company may cancel this Award and any unexercised Option Shares, and recover from you:  (i)the gross amount, before deduction of applicable taxes or other amounts, of any gain realized on the exercise of the Option, and (ii)the total number or Vesting Date value of the number of vested Restricted

6

Stock Shares, in each case during the twenty-four (24) month period preceding your breach of any covenant in Section 6 of this Award Agreement. 

(j)If you fail to comply with Section 6 of this Award Agreement, upon demand by the Company, you will repay the Company in accordance with the terms of Section 12(a), and the Company shall be entitled to offset the amount of any such repayment obligation against any amount owed to you by the Company.  The remedies set forth in this Section are in addition to any other remedies the Company may have, at law or equity, for your violation of the terms of this Award Agreement.

8.Transfer of Award.

(k)Option. Except as otherwise determined by the Committee, the Option may not be transferred, assigned or pledged (except by will or the laws of descent and distribution, or pursuant to a domestic relations order).

(l)Restricted Stock.  The Restricted Stock may not, except as otherwise provided in the Plan, be sold, assigned, transferred, pledged or encumbered in any way prior to the vesting of the Restricted Stock Shares, whether by operation of law or otherwise, except by will or the laws of descent and distribution.  After the Vesting Date, the vested Restricted Stock Shares may be issued during your lifetime only to you, or after your death to your designated beneficiary, or, in the absence of such beneficiary, to your duly qualified personal representative.

9.Rights as a Stockholder.

(m)Option Shares.  You will not have any rights as a stockholder with respect to the Option Shares until you become the holder of record of any such shares by exercising the Option.

(n)Restricted Stock Shares.  You will not have the rights of a stockholder with respect to the Restricted Stock Shares, including, but not limited to, the right to receive cash dividends, if any, as may be declared on such Restricted Stock Shares from time to time or the right to vote (in person or by proxy) such Restricted Stock Shares at any meeting of stockholders of the Company, until after the Vesting Date, and then only with respect to the Restricted Stock Shares which vest. 

10.Limitation of Rights.Neither the Plan, the granting of the Award nor this Award Agreement gives you any right to remain in the employment of the Company or any Affiliate.

11.Rights of Company and Affiliates.  This Award Agreement does not affect the right of the Company or any Affiliate to take any corporate action whatsoever, including without limitation its right to recapitalize, reorganize or make other changes in its capital structure or business, merge or consolidate, issue bonds, notes, shares of Common Stock or other securities, including preferred stock, or options therefor, dissolve or liquidate, or sell or transfer any part of its assets or business.

12.Plan Controls.  The Award is subject to all of the provisions of the Plan, which is hereby incorporated by reference, and is further subject to all the interpretations, amendments,

7

rules and regulations that may from time to time be promulgated and adopted by the Committee pursuant to the Plan.  In the event of any conflict among the provisions of the Plan and this Award Agreement, the provisions of the Plan will be controlling and determinative.

13.Amendment.  Except as otherwise provided by the Plan, the Company may only alter, amend or terminate the Award with your consent.

14.Governing Law.  This Award Agreement shall be governed by and construed in accordance with the laws of the State of New York, except as superseded by applicable federal law, without giving effect to its conflicts of law provisions.  All parties consent to exclusive personal jurisdiction in New York courts and agree that venue shall be New York State Supreme Court, Monroe County.

15.Section 409A.  The Option and the Restricted Stock are intended to qualify for an exemption from the requirements of Section 409A of the Internal Revenue Code of 1986, as amended, and the treasury regulations promulgated and other official guidance issued thereunder (collectively, “Section 409A”), and the Plan and this Award Agreement shall be administered and interpreted consistent with such intention.  The Company’s right to offset pursuant to Section 7(b) is limited to the extent that and until the application of an offset at a given time would not result in a violation of Section 409A.

16.Dodd-Frank Clawback.  Notwithstanding any provision of this Award Agreement to the contrary, this Award is subject to clawback under any policy adopted by the Company implementing Section 10D of the Securities Exchange Act of 1934, as amended, and any regulations promulgated, or national securities exchange listing conditions adopted, with respect thereto, as described in the Plan.

*  *  *  *  *

8

EX-21.1

EXHIBIT 21.1

SUBSIDIARIES OF THE REGISTRANT

SUBSIDIARIES OF PAYCHEX, INC. AS OF MAY 31, 2016

Name of Subsidiaries	Jurisdiction of Incorporation
Advantage Payroll Services Inc.	Delaware
Expense Wire LLC (3)	Ohio
Fast 401k, Inc.	Delaware
HR Services Inc. (3)	Ohio
NETTIME SOLUTIONS, L.L.C.	Arizona
Paychex Advance LLC	New York
Paychex Benefit Technologies Inc.	Delaware
Paychex Brazil LLC	New York
Paychex Business Solutions, LLC (4)	Florida
Paychex Deutschland GmbH	Germany
Paychex Insurance Agency, Inc.	New York
Paychex Insurance Concepts, Inc.	New York
Paychex Investment LLC (1)	Delaware
Paychex Management Corp. (2)	New York
Paychex North America Inc.	Delaware
Paychex of New York LLC (2)	Delaware
Paychex Real Estate, LLC (2)	New York
Paychex Recordkeeping Services, Inc.	Delaware
Paychex Securities Corporation	New York
Paychex Time & Attendance Inc.	Delaware
PXC Inc.	New York
Rapid Payroll, Inc.	California
SurePayroll Inc.	Delaware

(1) Paychex Investment LLC is 100% owned by PXC Inc.

(2) Paychex of New York LLC, Paychex Management Corp. and Paychex Real Estate, LLC are 100% owned by Paychex Investment LLC.

(3) Expense Wire LLC and HR Services Inc. are 100% owned by Paychex of New York LLC.

(4) Paychex Business Solutions, LLC is 100% owned by Paychex North America Inc.

Certain subsidiaries, which considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary, per Regulation S-X, Article 1, as of May 31, 2016, have been omitted from this exhibit.

EX-23.1

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S‑8 Nos. 333-84055, 333-207592, and 333-207594 of Paychex, Inc. of our report dated July 22, 2016 relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.

/s/ PricewaterhouseCoopers LLP

Rochester, New York

July 22, 2016

EX-24.1

EXHIBIT 24.1

POWER OF ATTORNEY

The undersigned Directors of Paychex, Inc., do hereby constitute and appoint Martin Mucci their true and lawful attorney and agent, to execute the Paychex, Inc., Annual Report on Form 10-K for the fiscal year ended May 31, 2016, for us and in our names as Directors, to comply with the Securities Exchange Act of 1934, as amended, and the rules, regulations and requirements of the Securities and Exchange Commission in connection therewith.

Dated:	July7,2016	/s/B.ThomasGolisano
		B.ThomasGolisano
Dated:	July7, 2016	/s/JosephG.Doody
		JosephG.Doody
Dated:	July7,2016	/s/DavidJ.S.Flaschen
		DavidJ.S.Flaschen
Dated:	July7,2016	/s/PhillipHorsley
		PhillipHorsley
Dated:	July7,2016	/s/GrantM.Inman
		GrantM.Inman
Dated:	July7,2016	/s/PamelaA.Joseph
		PamelaA.Joseph
Dated:	July7,2016	/s/JosephM.Tucci
		JosephM.Tucci
Dated:	July7,2016	/s/JosephM.Velli
		JosephM.Velli

EX-31.1

EXHIBIT 31.1

CERTIFICATION PURSUANT TO

SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, MARTIN MUCCI, certify that:

1. I have reviewed this Annual Report on Form 10-K of Paychex, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	July 22, 2016	/s/MartinMucci
		PresidentandChief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION PURSUANT TO

SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

I, EFRAIN RIVERA, certify that:

1. I have reviewed this Annual Report on Form 10-K of Paychex, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	July 22, 2016	/s/ Efrain Rivera
		SeniorVicePresident,ChiefFinancial Officer, and Treasurer

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Paychex, Inc. (the “Company”) on Form 10-K for the fiscal year ended May 31, 2016 as filed with the Securities and Exchange Commission (“SEC”) on the date hereof (the “Report”), I, MARTIN MUCCI, Chief Executive Officer (principal executive officer) of the Company, certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)  The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)  The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

A signed original of this written statement has been provided to the Company and will be retained by the Company and furnished to the SEC upon request.

Date:	July 22, 2016
/s/ Martin Mucci
Martin Mucci
President and Chief Executive Officer

EX-32.2

EXHIBIT 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Paychex, Inc. (the “Company”) on Form 10-K for the fiscal year ended May 31, 2016 as filed with the Securities and Exchange Commission (“SEC”) on the date hereof (the “Report”), I, EFRAIN RIVERA, Chief Financial Officer (principal financial officer) of the Company, certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

A signed original of this written statement has been provided to the Company and will be retained by the Company and furnished to the SEC upon request.

Date:	July 22, 2016
/s/ EfrainRivera
EfrainRivera
SeniorVicePresident,ChiefFinancialOfficer,andTreasurer

XML

Document and Entity Information - USD ($)	12 Months Ended
	May 31, 2016	Jun. 30, 2016	Nov. 30, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	PAYCHEX INC
Entity Filer Category	Large Accelerated Filer
Entity Central Index Key	0000723531
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Amendment Flag	false
Document Type	10-K
Document Fiscal Period Focus	FY
Document Period End Date	May 31, 2016
Document Fiscal Year Focus	2016
Current Fiscal Year End Date	--05-31
Entity Common Stock, Shares Outstanding		360,532,001
Entity Public Float			$ 17,491,967,248

XML

Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	May 31, 2016		May 31, 2015		May 31, 2014
Revenue:
Service revenue	$ 2,905.8		$ 2,697.5		$ 2,478.2
Interest on funds held for clients	46.1		42.1		40.7
Total revenue	2,951.9		2,739.6		2,518.9
Expenses:
Operating expenses	857.1		808.0		732.5
Selling, general and administrative expenses	948.2		878.0		803.7
Total expenses	1,805.3		1,686.0		1,536.2
Operating income	1,146.6		1,053.6		982.7
Investment income, net	4.5		6.4		5.4
Income before income taxes	1,151.1		1,060.0		988.1
Income taxes	394.3		385.1		360.6
Net income	756.8		674.9		627.5
Other comprehensive income/(loss), net of tax:
Unrealized gains/(losses) on securities, net of tax	21.7		(14.0)		(0.5)
Total other comprehensive income/(loss), net of tax	21.7		(14.0)		(0.5)
Comprehensive income	$ 778.5		$ 660.9		$ 627.0
Basic earnings per share	$ 2.10	[1]	$ 1.86	[1]	$ 1.72
Diluted earnings per share	$ 2.09	[1]	$ 1.85	[1]	$ 1.71
Weighted-average common shares outstanding	360.7		362.9		364.5
Weighted-average common shares outstanding, assuming dilution	362.5		364.6		366.1
Cash dividends per common share	$ 1.68		$ 1.52		$ 1.40

[1] Each quarter is a discrete period and the sum of the four quarters' basic and diluted earnings per share amounts may not equal the full year amount.

XML

Consolidated Balance Sheets - USD ($) $ in Millions	May 31, 2016	May 31, 2015
Assets
Cash and cash equivalents	$ 131.5	$ 170.0
Corporate investments	220.6	366.6
Interest receivable	36.1	37.9
Accounts receivable, net of allowance for doubtful accounts	408.6	176.6
Prepaid income taxes	10.5	12.9
Prepaid expenses and other current assets	58.8	50.8
Current assets before funds held for clients	866.1	814.8
Funds held for clients	3,997.5	4,273.4
Total current assets	4,863.6	5,088.2
Long-term corporate investments	441.1	399.8
Property and equipment, net of accumulated depreciation	353.0	353.9
Intangible assets, net of accumulated amortization	69.5	32.4
Goodwill	657.1	561.5
Prepaid income taxes	24.9
Other long-term assets	31.6	31.7
Total assets	6,440.8	6,467.5
Liabilities
Accounts payable	56.7	51.7
Accrued compensation and related items	247.8	210.4
Deferred revenue	26.3	11.2
Other current liabilities	79.8	39.6
Current liabilities before client fund obligations	410.6	312.9
Client fund obligations	3,955.3	4,260.1
Total current liabilities	4,365.9	4,573.0
Accrued income taxes	72.8	44.8
Deferred income taxes	22.1	1.8
Other long-term liabilities	68.3	62.4
Total liabilities	4,529.1	4,682.0
Commitments and contingencies - Note N
Stockholders' equity
Common stock, $0.01 par value; Authorized: 600.0 shares; Issued and outstanding: 360.4 shares as of May 31, 2016 and 361.2 shares as of May 31, 2015, respectively.	3.6	3.6
Additional paid-in capital	952.7	880.1
Retained earnings	926.2	894.3
Accumulated other comprehensive income	29.2	7.5
Total stockholders' equity	1,911.7	1,785.5
Total liabilities and stockholders' equity	$ 6,440.8	$ 6,467.5

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	May 31, 2016	May 31, 2015
Stockholders' equity
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	600,000,000	600,000,000
Common stock, shares issued	360,400,000	361,200,000
Common stock, shares outstanding	360,400,000	361,200,000

XML

Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
Beginning balance, Shares at May. 31, 2013	365.4
Beginning balance at May. 31, 2013	$ 3.7	$ 659.5	$ 1,088.5	$ 22.0	$ 1,773.7
Net income			627.5		627.5
Unrealized (losses)/gains on securities, net of tax				(0.5)	(0.5)
Cash dividends declared			(510.6)		(510.6)
Repurchases of common shares, Shares	(6.2)
Repurchases of common shares	$ (0.1)	(11.2)	(238.4)		(249.7)
Stock-based compensation		26.4			26.4
Stock-based award transactions, Shares	3.8
Stock-based award transactions		119.7	(9.5)		110.2
Ending balance, Shares at May. 31, 2014	363.0
Ending balance at May. 31, 2014	$ 3.6	794.4	957.5	21.5	1,777.0
Net income			674.9		674.9
Unrealized (losses)/gains on securities, net of tax				(14.0)	(14.0)
Cash dividends declared			(551.8)		(551.8)
Repurchases of common shares, Shares	(3.9)
Repurchases of common shares		(7.2)	(175.2)		(182.4)
Stock-based compensation		31.5			31.5
Stock-based award transactions, Shares	2.1
Stock-based award transactions		61.4	(11.1)		$ 50.3
Ending balance, Shares at May. 31, 2015	361.2				361.2
Ending balance at May. 31, 2015	$ 3.6	880.1	894.3	7.5	$ 1,785.5
Net income			756.8		756.8
Unrealized (losses)/gains on securities, net of tax				21.7	21.7
Cash dividends declared			(606.5)		(606.5)
Repurchases of common shares, Shares	(2.2)
Repurchases of common shares		(4.1)	(103.8)		(107.9)
Stock-based compensation		34.6			34.6
Stock-based award transactions, Shares	1.4
Stock-based award transactions		42.1	(14.6)		$ 27.5
Ending balance, Shares at May. 31, 2016	360.4				360.4
Ending balance at May. 31, 2016	$ 3.6	$ 952.7	$ 926.2	$ 29.2	$ 1,911.7

XML

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Operating activities
Net income	$ 756.8	$ 674.9	$ 627.5
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization on property and equipment and intangible assets	115.1	106.6	105.0
Amortization of premiums and discounts on available-for-sale securities	75.7	76.2	70.3
Stock-based compensation costs	34.6	31.4	26.3
Provision/(benefit) for deferred income taxes	7.1	(4.1)	(4.9)
Provision for allowance for doubtful accounts	2.5	1.6	2.5
Net realized gains on sales of available-for-sale securities	(0.1)	(0.3)	(0.6)
Changes in operating assets and liabilities:
Interest receivable	1.8	(1.6)	(3.9)
Accounts receivable	(37.5)	(28.2)	(18.2)
Prepaid expenses and other current assets	(5.0)	(8.5)	22.5
Accounts payable and other current liabilities	63.3	51.1	45.1
Net change in other long-term assets and liabilities	3.9	(3.9)	9.3
Net cash provided by operating activities	1,018.2	895.2	880.9
Investing activities
Purchases of available-for-sale securities	(12,572.2)	(34,020.4)	(29,850.5)
Proceeds from sales and maturities of available-for-sale securities	11,984.3	33,719.5	30,080.6
Net change in funds held for clients’ money market securities and other cash equivalents	927.6	149.1	(441.5)
Purchases of property and equipment	(97.7)	(102.8)	(84.1)
Acquisition of businesses, net of cash acquired	(296.1)	(27.1)	(9.3)
Purchases of other assets	(9.0)	(3.3)	(11.3)
Net cash used in by investing activities	(63.1)	(285.0)	(316.1)
Financing activities
Net change in client fund obligations	(304.8)	93.0	127.4
Dividends paid	(606.5)	(551.8)	(510.6)
Repurchases of common shares	(107.9)	(182.4)	(249.7)
Equity activity related to stock-based awards	25.6	48.5	113.3
Net cash used in financing activities	(993.6)	(592.7)	(519.6)
(Decrease)/increase in cash and cash equivalents	(38.5)	17.5	45.2
Cash and cash equivalents, beginning of fiscal year	170.0	152.5	107.3
Cash and cash equivalents, end of fiscal year	$ 131.5	$ 170.0	$ 152.5

XML

Description of Business, Basis of Presentation, and Significant Accounting Policies

12 Months Ended

May 31, 2016

Description of Business, Basis of Presentation, and Significant Accounting Policies [Abstract]

Description of Business, Basis of Presentation, and Significant Accounting Policies

Note A — Description of Business, Basis of Presentation, and Significant Accounting Policies

Description of business:  Paychex, Inc. and its wholly owned subsidiaries (collectively the “Company” or “Paychex”) is a leading provider of integrated human capital management (“HCM”) solutions for payroll, human resource, retirement, and insurance services for small- to medium-sized businesses in the United States (“U.S.”). The Company also has operations in Germany.

Paychex, a Delaware corporation formed in 1979, reports as one segment. Substantially all of the Company’s revenue is generated within the U.S. The Company also generates revenue within Germany, which represented less than one percent of the Company's total revenue for each of the years ended May 31, 2016 (“fiscal 2016”), 2015 (“fiscal 2015”), and 2014 (“fiscal 2014”). Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company as of May 31, 2016 and May 31, 2015. In addition, the Company has equity method investments for a joint-venture in Brazil and a minority investment in a Canadian entity, neither of which is significant.

Total revenue is comprised of service revenue and interest on funds held for clients. Service revenue is comprised primarily of the fees earned on our portfolio of HCM services, which include payroll processing and complementary human resource management and administration services. Payroll service revenue is earned primarily from payroll processing, payroll tax administration services, employee payment services, and other ancillary services. Payroll processing services include the calculation, preparation, and delivery of employee payroll checks; production of internal accounting records and management reports; preparation of federal, state, and local payroll tax returns; and collection and remittance of clients’ payroll obligations.

Our Human Resource Services (“HRS”) portfolio of services and products provide small- to medium-sized businesses with retirement services administration, insurance services, HR administration services, and other human resource services and products. Our comprehensive human resource outsourcing service is available through Paychex HR Solutions, an administrative services organization (“ASO”), and Paychex PEO, a professional employer organization (“PEO”). Both options offer businesses a combined package of services that includes payroll, employer compliance, human resource and employee benefits administration, risk management outsourcing, and the on-site availability of a professionally trained human resource services representative, among other services. These comprehensive bundles of services are designed to make it easier for businesses to manage their payroll and related benefits costs while providing a benefits package equal to that of larger companies. The PEO differs from the ASO in that Paychex serves as a co-employer of the clients’ employees, offers health care coverage to PEO client employees, and assumes the risks and rewards of workers’ compensation insurance and certain health insurance products. PEO services are sold through the Company’s registered and licensed subsidiary, Paychex Business Solutions, Inc. Paychex HR Essentials is an ASO product that provides support to the Company’s clients over the phone or online to help manage employee-related topics.

In connection with the automated payroll tax administration services, the Company electronically collects payroll taxes from clients’ bank accounts, typically on payday, prepares and files the applicable tax returns, and remits taxes to the applicable tax or regulatory agencies on the respective due dates. These taxes are typically paid between one and 30 days after receipt of collections from clients, with some items extending to 90 days. The Company handles regulatory correspondence, amendments, and penalty and interest disputes, and is subject to cash penalties imposed by tax or regulatory agencies for late filings and late or under payment of taxes. With employee payment services, employers are offered the option of paying their employees by direct deposit, payroll debit card, a check drawn on a Paychex account (Readychex®), or a check drawn on the employer’s account and electronically signed by Paychex. For the first three methods, Paychex electronically collects net payroll from the clients’ bank accounts, typically one business day before payday, and provides payment to the employees on payday.

The Company earns fees for funding of temporary staffing agencies payroll via purchasing of accounts receivable invoices.  The fees are deducted from the funding payment and revenue is recognized over an average collection period of 45 to 60 days.

In addition to service fees paid by clients, the Company earns interest on funds held for clients that are collected before due dates and invested until remittance to the applicable tax or regulatory agencies or client employees. The funds held for clients and related client fund obligations are included in the Consolidated Balance Sheets as current assets and current liabilities, respectively. The amount of funds held for clients and related client fund obligations varies significantly during the year.

Basis of presentation:  The consolidated financial statements include the accounts of Paychex, Inc. and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Subsequent Events:  The Company has evaluated subsequent events for potential recognition and/or disclosure through the date of issuance of these financial statements.  On July 7, 2016, Paychex announced that the Board of Directors (the “Board”) approved a $0.04 increase in the Company’s regular quarterly dividend, an increase of 10%.  The quarterly dividend will go from $0.42 per share to $0.46 per share and is payable on August 25, 2016 to shareholders of record on August 1, 2016. 

Cash and cash equivalents:  Cash and cash equivalents consist of available cash, money market securities, and other investments with a maturity of 90 days or less at acquisition.

Accounts receivable, net of allowance for doubtful accounts:  Accounts receivable balances are shown on the Consolidated Balance Sheets net of the allowance for doubtful accounts of $4.2 million as of May 31, 2016 and $1.4 million as of May 31, 2015. Accounts receivable balances, net of allowance for doubtful accounts, include: 1) trade receivables for services provided to clients of $221.6 million as of May 31, 2016 and $176.6 million as of May 31, 2015; and 2) purchased receivables related to funding arrangements with clients, resulting from the acquisition of Advance Partners in December 2015, of $187.0 million as of May 31, 2016. Accounts receivable are written off and charged against the allowance for doubtful accounts when the Company has exhausted all collection efforts without success. No single client had a material impact on total accounts receivable, service revenue, or results of operations.

Funds held for clients and corporate investments:  Marketable securities included in funds held for clients and corporate investments consist primarily of securities classified as available-for-sale and are recorded at fair value obtained from an independent pricing service. The funds held for clients portfolio also includes cash, money market securities, and short-term investments. Unrealized gains and losses, net of applicable income taxes, are reported as other comprehensive income in the Consolidated Statements of Income and Comprehensive Income. Realized gains and losses on the sale of available-for-sale securities are determined by specific identification of the cost basis of each security. On the Consolidated Statements of Income and Comprehensive Income, realized gains and losses from the funds held for client portfolio and corporate investment portfolio are included in interest on funds held for clients and investment income, net, respectively.

Concentrations:  Substantially all of the Company’s deposited cash is maintained at large well-capitalized (as defined by their regulators) financial institutions. These deposits may exceed the amount of any insurance provided. All of the Company’s deliverable securities, primarily municipal bond securities, are held in custody with certain of the aforementioned financial institutions, for which that institution bears the risk of custodial loss. Non-deliverable securities, primarily time deposits and money market funds, are held by well-capitalized financial institutions.

Property and equipment, net of accumulated depreciation:  Property and equipment is stated at cost, less accumulated depreciation. Depreciation is based on the estimated useful lives of property and equipment using the straight-line method. The estimated useful lives of depreciable assets are generally as follows:

Category	Depreciable life
Buildings and improvements	Ten to 35 years or the remaining life, whichever is shorter
Data processing equipment	Three to four years
Furniture, fixtures, and equipment	Three to seven years
Leasehold improvements	Ten years or the life of the lease, whichever is shorter

Normal and recurring repairs and maintenance costs are charged to expense as incurred. The Company reviews the carrying value of property and equipment for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable.

Software development and enhancements:  Expenditures for software purchases and software developed for internal use are capitalized and depreciated on a straight-line basis over the estimated useful lives, which are generally three to five years. Software developed as part of the Company's main processing platform is depreciated over fifteen years.  For software developed for internal use, certain costs are capitalized, including external direct costs of materials and services associated with developing or obtaining the software, and payroll and payroll-related costs for employees who are directly associated with internal-use software projects. Capitalization of these costs ceases no later than the point at which the project is substantially complete and ready for its intended use. Costs associated with preliminary project stage activities, training, maintenance, and other post-implementation stage activities are expensed as incurred. The carrying value of software and development costs is reviewed for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable.

Goodwill and other intangible assets, net of accumulated amortization:  The Company has $657.1 million and $561.5 million of goodwill as of May 31, 2016 and 2015, respectively. Goodwill is not amortized, but instead is tested for impairment on an annual basis and between annual tests if an event occurs or circumstances change in a way to indicate that there has been a potential decline in the fair value of a reporting unit.  We performed our annual impairment testing in our fiscal fourth quarter.  A quantitative analysis was performed for our German reporting unit.  For all other reporting units, we utilized a qualitative assessment to determine if it more-likely-than-not that the fair value of the reporting unit had declined below its carrying value.  The assessment considered various financial, macroeconomic, industry, and reporting unit specific qualitative factors.  Based on the results of our testing, no impairment loss was recognized in the results of operations for fiscal years 2016,  2015, or 2014. Subsequent to the latest review, there have been no events or circumstances that indicate any potential impairment of the Company’s goodwill balance.

Intangible assets are comprised primarily of client list acquisitions and are reported net of accumulated amortization on the Consolidated Balance Sheets. Intangible assets are amortized over periods generally ranging from three to twelve years. Client lists use an accelerated method, while other intangible assets use the straight-line method of amortization. The Company tests intangible assets for potential impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable.

Revenue recognition:  Revenues are primarily attributable to fees for providing services as well as investment income earned on funds held for clients.  Fees associated with services are recognized in the period services are rendered and earned under service arrangements with clients where service fees are fixed or determinable and collectability is reasonably assured. Certain processing services are provided under annual service arrangements with revenue recognized ratably over the service period. The Company’s service revenue is largely attributable to processing services where the fee is based on a fixed amount per processing period or a fixed amount per processing period plus a fee per employee or transaction processed. Fees earned for funding of payrolls for temporary staffing agency clients via the purchase of accounts receivable invoices are based on a percentage of funding amounts as specified in the client contract. These fees are then recognized over the average collection period of 45 to 60 days.  The revenue earned from delivery service for the distribution of certain client payroll checks and reports is included in service revenue, and the costs for the delivery are included in operating expenses on the Consolidated Statements of Income and Comprehensive Income.

For certain of the Company's service offerings, it receives advance payments for set-up fees from its clients.  The Company defers revenue associated with these advance payments, recognizing the revenue and related expenses over the expected life of its clients.

PEO revenue is included in service revenue and is reported net of certain direct pass-through costs billed and incurred, which primarily include payroll wages, payroll taxes, and certain benefit premiums.  Direct costs related to certain benefit plans where the Company retains risk are recognized as operating expenses rather than as a reduction in service revenue. Direct pass-through costs billed and incurred that were a reduction in service revenue were $5.1 billion, $4.2 billion, and $3.4 billion for fiscal years 2016,  2015, and 2014, respectively.

Interest on funds held for clients is earned primarily on funds that are collected from clients before due dates for payroll tax administration services and for employee payment services, and invested until remittance to the applicable tax or regulatory agencies or client employees. The interest earned on these funds is included in total revenue on the Consolidated Statements of Income and Comprehensive Income because the collecting, holding, and remitting of these funds are components of providing these services. Interest on funds held for clients also includes net realized gains and losses from the sales of available-for-sale securities.

PEO insurance reserves:  As part of the PEO service, the Company offers workers’ compensation insurance and health insurance to client companies for the benefit of client employees. Workers' compensation insurance is provided under a fully insured high deductible workers’ compensation policy with a national insurance carrier. Workers’ compensation insurance reserves are established to provide for the estimated costs of paying claims up to per occurrence liability limits. In establishing the PEO workers' compensation insurance reserves, the Company uses an independent actuarial estimate of undiscounted future cash payments that would be made to settle the claims.

The Company’s maximum individual claims liability was $1.3 million and $1.0 million under its fiscal 2016 and fiscal 2015 workers' compensation policies, respectively. As of May 31, 2016 and May 31, 2015, the Company had recorded current liabilities of $13.8 million and $11.3 million, respectively, and long-term liabilities of $18.4 million and $15.3 million,  respectively, on its Consolidated Balance Sheets for workers’ compensation costs.

With respect to the PEO health insurance, the Company offers various health insurance plans that take the form of either fully insured fixed cost plans with various national insurance carriers or a fully insured minimum premium insurance arrangement with coverage provided through a single national carrier. Under the minimum premium arrangement, the Company's health benefits insurance reserves are established to provide for the payment of claims liability charges in accordance with its service contract with the carrier. The claims liability charges include estimates for reported losses, plus amounts for those claims incurred but not reported, and estimates of certain expenses associated with processing and settling the claims.  The Company's maximum individual claims liability is $0.3 million under both its calendar 2016 and 2015 minimum premium health insurance plan policies.  Amounts accrued related to the health insurance reserves are $9.5 million and $8.1 million as of May 31, 2016 and May 31, 2015, respectively. These amounts are included in current liabilities on the Consolidated Balance Sheets.

Estimating the ultimate cost of future claims is an uncertain and complex process based upon historical loss experience and actuarial loss projections, and is subject to change due to multiple factors, including economic trends, changes in legal liability law, and damage awards, all of which could materially impact the reserves as reported in the consolidated financial statements.  Accordingly, final claim settlements may vary from the present estimates, particularly with workers' compensation insurance where those payments may not occur until well into the future.  The Company regularly reviews the adequacy of its estimated insurance reserves.  Adjustments to previously established reserves are reflected in the results of operations for the period in which the adjustment is identified. Such adjustments could be significant, reflecting any combination of new and adverse or favorable trends.

Stock-based compensation costs:  All stock-based awards to employees are recognized as compensation costs in the consolidated financial statements based on their fair values measured as of the date of grant. The Company estimates the fair value of stock option grants using a Black-Scholes option pricing model. This model requires various assumptions as inputs including expected volatility of the Paychex stock price and expected option life. Volatility is estimated based on a combination of historical volatility, using stock prices over a period equal to the expected option life, and implied market volatility. Expected option life is estimated based on historical exercise behavior.  The Company periodically reassesses its assumptions as well as its choice of valuation model.  The Company will reconsider use of this model if additional information becomes available in the future indicating that another model would provide a more accurate estimate of fair value, or if characteristics of future grants would warrant such a change.

The fair value of stock awards is determined based on the stock price at the date of grant.  For grants that do not accrue dividends or dividend equivalents, the fair value is the stock price reduced by the present value of estimated dividends over the vesting period or performance period.

The Company is required to estimate forfeitures and only record compensation costs for those awards that are expected to vest. The assumptions for forfeitures were determined based on type of award and historical experience. Forfeiture assumptions are adjusted at the point in time a significant change is identified, with any adjustment recorded in the period of change, and the final adjustment at the end of the requisite service period to equal actual forfeitures.

The assumptions of volatility, expected option life, and forfeitures all require significant judgment and are subject to change in the future due to factors such as employee exercise behavior, stock price trends, and changes to type or provisions of stock-based awards. Any material change in one or more of these assumptions could have an impact on the estimated fair value of a future award.

Refer to Note E for further discussion of the Company’s stock-based compensation plans.

Income taxes:  The Company accounts for deferred taxes by recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the consolidated financial statements or tax returns. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities, using enacted tax rates in effect for the year in which the differences are expected to reverse. The Company records a deferred tax asset related to the stock-based compensation costs recognized for certain stock-based awards. At the time of the exercise of non-qualified stock options or vesting of stock awards, the Company accounts for the resulting tax deduction by reducing its accrued income tax liability with an offset to the deferred tax asset and any excess of the tax benefit over the deferred tax asset as an increase to additional paid-in capital. The Company currently has a sufficient pool of excess tax benefits in additional paid-in capital to absorb any deficiency in tax benefits that fall short of the related deferred tax asset related to stock-based awards.

The Company also maintains a reserve for uncertain tax positions. The Company evaluates tax positions taken or expected to be taken in a tax return for recognition in its consolidated financial statements. Prior to recording the related tax benefit in the consolidated financial statements, the Company must conclude that tax positions will be more-likely-than-not to be sustained, assuming those positions will be examined by taxing authorities with full knowledge of all relevant information. The benefit recognized in the consolidated financial statements is the amount the Company expects to realize after examination by taxing authorities. If a tax position drops below the more-likely-than-not standard, the benefit can no longer be recognized. Assumptions, judgment, and the use of estimates are required in determining if the more-likely-than-not standard has been met when developing the provision for income taxes and in determining the expected benefit. A change in the assessment of the more-likely-than-not standard could materially impact the Company’s results of operations or financial position. The Company’s reserve for uncertain tax positions, including interest and net of federal benefits, was $54.2 million as of May 31, 2016 and $29.1 million as of May 31, 2015. Refer to Note J for further discussion of the Company’s reserve for uncertain tax positions.

Use of estimates:  The preparation of financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires management to make estimates, judgments, and assumptions that affect reported amounts of assets, liabilities, revenue, and expenses during the reporting period. Actual amounts and results could differ from these estimates.

Reclassifications:  Certain prior period amounts have been reclassified to conform to the current period presentation and had no effect on reported consolidated earnings.

Recently adopted accounting pronouncements:  In March 2016, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”)  No. 2015-17 “Income Taxes (Topic 740) - Balance Sheet Classification of Deferred Taxes.” This guidance requires deferred tax assets and liabilities be classified as non-current in a classified statement of financial position. This guidance is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2016, with early application permitted as of the beginning of an interim or annual reporting period. With the adoption, the Company’s deferred tax assets and liabilities were classified as non-current on its Consolidated Balance Sheet and prior period amounts have been reclassified to conform with current year presentation. Adoption of this guidance did not materially impact its consolidated financial statements.

Recently issued accounting pronouncements:  In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606).”  This guidance supersedes current guidance on revenue recognition in Topic 605, “Revenue Recognition.”  In addition, there are disclosure requirements related to the nature, amount, timing, and uncertainty of revenue recognition.  This guidance will be effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods. Early application of the guidance is permitted for annual reporting periods beginning after December 31, 2016.  Additional ASUs have been issued to amend or clarify this ASU as follows:

· ASU No. 2016-12 “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients” was issued in May 2016. ASU No. 2016-12 amends the new revenue recognition standard to clarify the guidance on assessing collectability, presenting sales taxes, measuring noncash consideration, and certain transition matters.

· ASU No. 2016-10 “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing” was issued in April 2016. ASU No. 2016-10 addresses implementation issues identified by the FASB-International Accounting Standards Board Joint Transition Resource Group for Revenue Recognition (TRG). 

· ASU No. 2016-08 “Revenue from Contracts with Customers (Topic 606) - Principal versus Agent Considerations (Reporting Revenue Gross versus Net)” was issued in March 2016.   ASU No. 2016-08 requires an entity to determine whether the nature of its promise to provide goods or services to a customer is performed in a principal or agent capacity and to recognize revenue in a gross or net manner based on its principal/agent designation.

This guidance in these ASUs for revenue recognition is applicable to the Company's fiscal year beginning June 1, 2018.  The Company has substantially completed its initial analysis identifying the areas that will be impacted by the new guidance and is currently analyzing the impact to its consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13 “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.”ASU No. 2016-13 requires an organizationto measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts.  ASU No. 2016-13 is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2019. This guidance is applicable to the Company's fiscal year beginning June 1, 2020. The Company is currently evaluating this guidance to determine the potential impact on its consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09 “Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU No. 2016-09 simplifies several aspects of the accounting for share-based payment award transactions, including income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows.  ASU No. 2016-09 is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2016, with early application permitted. This guidance is applicable to the Company's fiscal year beginning June 1, 2017. The Company does not anticipate this to be material to its consolidated financial statements, and anticipates adopting this standard for its fiscal year beginning June 1, 2016.

In February 2016, the FASB issued ASU No. 2016-02 “Leases (Topic 842).” ASU No. 2016-02 improves transparency and comparability among companies by recognizing lease assets and lease liabilities on the balance sheet and by disclosing key information about leasing arrangements. ASU No. 2016-02 is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2018, with early application permitted. This guidance is applicable to the Company's fiscal year beginning June 1, 2019. The Company is currently evaluating this guidance to determine the potential impact on its consolidated financial statements.

In January 2016, the FASB issued ASU No. 2016-01 “Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU No. 2016-01 provides updated guidance for the recognition, measurement, presentation, and disclosure of certain financial assets and liabilities. ASU No. 2016-01 is effective for public business entities for annual and interim periods beginning after December 15, 2017, with early application permitted. This guidance is applicable to the Company's fiscal year beginning June 1, 2018. The Company is currently evaluating this guidance to determine the potential impact on its consolidated financial statements.

Other recent authoritative guidance issued by the FASB (including technical corrections to the FASB Accounting Standards Codification), the American Institute of Certified Public Accountants, and the Securities and Exchange Commission (“SEC”) did not, or are not expected to have a material effect on the Company’s consolidated financial statements.

XML

Basic and Diluted Earnings Per Share

12 Months Ended

May 31, 2016

Basic and Diluted Earnings Per Share [Abstract]

Basic and Diluted Earnings Per Share

Note B — Basic and Diluted Earnings Per Share

Basic and diluted earnings per share were calculated as follows:

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Basic earnings per share:
Net income	$	756.8	$	674.9	$	627.5
Weighted-average common shares outstanding		360.7		362.9		364.5
Basic earnings per share	$	2.10	$	1.86	$	1.72
Diluted earnings per share:
Net income	$	756.8	$	674.9	$	627.5
Weighted-average common shares outstanding		360.7		362.9		364.5
Dilutive effect of common share equivalents		1.8		1.7		1.6
Weighted-average common shares outstanding, assuming dilution		362.5		364.6		366.1
Diluted earnings per share	$	2.09	$	1.85	$	1.71
Weighted-average anti-dilutive common share equivalents		0.5		0.3		0.7

Weighted-average common share equivalents that had an anti-dilutive impact are excluded from the computation of diluted earnings per share.

In May 2014, the Board approved a program to repurchase up to $350.0 million of the Company's common stock with authorization expiring on May 31, 2017. During fiscal 2016, the Company repurchased 2.2 million shares for $107.9 million and during fiscal 2015, the Company repurchased 3.9 million shares for $182.4 millionunder this program. All shares repurchased were retired.

In July 2016, the Board approved a new program to repurchase up to $350.0 million of the Company’s common stock with authorization expiring on May 31, 2019.  The purpose of the program is to manage common stock dilution.  Shares purchased will be retired.

XML

Business Combination

12 Months Ended

May 31, 2016

Business Combination [Abstract]

Business Combination

Note C — Business Combination

Effective December 22, 2015, substantially all of the net assets of Advance Partners, a leading provider of integrated financial, operational, and strategic services to support independent staffing firms, were acquired by a wholly owned subsidiary of the Company.  Advance Partners offers customizable solutions to the temporary staffing industry, including payroll funding and outsourcing services, which include payroll, invoicing, and tax preparation.  The acquisition consideration was comprised of a base purchase price of $190.5 million plus immediate settlement of debt totaling $118.4 million, net of $12.8 million in cash acquired. Accounts receivable balances acquired, net of allowance for doubtful accounts, and less amounts due to clients related to funding arrangements, totaled $164.8 million. This acquisition allows the Company access to a growing industry serving small- to medium-sized businesses. Goodwill in the amount of $95.6 million was recorded as a result of the acquisition, which is tax-deductible.

The financial results of Advance Partners is included in the Company’s consolidated financial statements from the date of acquisition.  The Company concluded that the acquisition was not material to its results of operations or financial position.  Therefore, pro-forma financial information has been excluded.

XML

Investment Income, Net

12 Months Ended

May 31, 2016

Investment Income, Net [Abstract]

Investment Income, Net

Note D — Investment Income, Net

Investment income, net, consisted of the following items:

	Year ended May 31,
In millions	2016		2015		2014
Interest income on corporate funds	$	8.4	$	7.8	$	6.9
Interest expense		(1.1)		(0.7)		(1.1)
Net loss from equity-method investments		(2.8)		(0.7)		(0.4)
Investment income, net	$	4.5	$	6.4	$	5.4

XML

Stock-Based Compensation Plans

12 Months Ended

May 31, 2016

Stock-Based Compensation Plans [Abstract]

Stock-Based Compensation Plans

Note E — Stock-Based Compensation Plans

The Paychex, Inc. 2002 Stock Incentive Plan, as amended and restated, effective on October 14, 2015 (the “2002 Plan”), authorizes grants of up to 44.1 million shares of the Company’s common stock. As of May 31, 2016, there were 22.2 million shares available for future grants under the 2002 Plan.

All stock-based awards to employees are recognized as compensation costs in the consolidated financial statements based on their fair values measured as of the date of grant. These costs are recognized as an expense in the Consolidated Statements of Income and Comprehensive Income on a straight-line basis over the requisite service period and increase additional paid-in capital.

Stock-based compensation expense was $34.6 million, $31.4 million, and $26.3 million for fiscal years 2016,  2015, and 2014, respectively. Related income tax benefits recognized were $12.9 million, $11.7 million, and $10.1 million for the respective fiscal years. Capitalized stock-based compensation costs related to the development of internal use software for these same fiscal years were not significant.

As of May 31, 2016, the total unrecognized compensation cost related to all unvested stock-based awards was $60.8 million and is expected to be recognized over a weighted-average period of 2.9 years.

Black-Scholes fair value assumptions:  The fair value of stock option grants and performance stock options was estimated at the date of grant using a Black-Scholes option pricing model. There were no performance stock options granted in fiscal 2016.  The weighted-average assumptions used for valuation under the Black-Scholes model are as follows:

	Year ended May 31,
	2014			2016			2015			2014
	Performance stock options			Stock options
Risk-free interest rate		1.5	%		1.9	%		2.1	%		2.0	%
Dividend yield		3.9	%		3.6	%		3.7	%		4.1	%
Volatility factor		0.20			0.18			0.21			0.22
Expected option life in years		4.5			6.1			6.0			6.4
Weighted-average grant-date   fair value of stock options granted (per share)	$	3.85		$	5.25		$	5.68		$	4.90

Risk-free interest rates are yields for zero coupon U.S. Treasury notes maturing approximately at the end of the expected option life. The estimated volatility factor is based on a combination of historical volatility, using stock prices over a period equal to the expected option life, and implied market volatility. The expected option life is based on historical exercise behavior.

The Company has determined that the Black-Scholes option pricing model, as well as the underlying assumptions used in its application, are appropriate in estimating the fair value of its stock option grants. The Company periodically assesses its assumptions as well as its choice of valuation model, and will reconsider use of this model if additional information becomes available in the future indicating that another model would provide a more accurate estimate of fair value, or if characteristics of future grants would warrant such a change.

Stock options:  Stock options entitle the holder to purchase, at the end of the vesting term, a specified number of shares of Paychex common stock at an exercise price per share set equal to the closing market price of the common stock on the date of grant. All stock options have a contractual life of ten years from the date of the grant and a vesting schedule as established by the Board. The Company issues new shares of common stock to satisfy stock option exercises. Non-qualified stock option grants to officers and outside directors are typically approved by the Board in July. Grants of non-qualified stock options to officers vest 25% per annum and grants to members of the Board vest after one year.

The following table summarizes stock option activity for the year ended May 31, 2016:

				Weighted-
		Weighted-		average
	Shares	average		remaining	Aggregate
	subject	exercise price		contractual	intrinsic
In millions, except per share amounts	to options	per share		term (years)	value(1)
Outstanding as of May 31, 2015	4.7	$	35.21
Granted	0.8	$	47.42
Exercised	(0.9)	$	34.77
Forfeited	(0.1)	$	38.46
Expired	—	$	35.89
Outstanding as of May 31, 2016	4.5	$	37.42	6.3	$	75.9
Exercisable as of May 31, 2016	2.6	$	33.84	4.9	$	53.1

(1) Market price of the underlying stock as of May 31, 2016 less the exercise price.

Other information pertaining to stock option grants is as follows:

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Total intrinsic value of stock options exercised	$	14.5	$	17.6	$	18.9
Total grant-date fair value of stock options vested	$	4.0	$	3.6	$	3.0

Performance stock options:  In July 2011, the Board approved a special award of performance-based stock options under a Long-Term Incentive Plan. Subsequent grants of this award have been made upon hire of new officers.  Under this award, stock options were granted to officers with vesting dependent on achievement against long-term strategic and financial objectives. Total shares earned and vested are based on achievement against pre-established targets for fiscal 2016.  However, the terms of the award allowed for accelerated vesting of up to 50% of the award at target depending on achievement against pre-established targets for fiscal 2014.  Based on achievement against pre-established targets for fiscal 2016, a total of 63.0% of the award was earned.  In July 2014, 23.5% of the awards accelerated and vested based on achievement against performance targets for fiscal 2014.  The remaining 39.5% of the awards will vest in July 2016.

The following table summarizes performance stock option activity for the year ended May 31, 2016:

				Weighted-
		Weighted-		average
	Shares	average		remaining	Aggregate
	subject	exercise price		contractual	intrinsic
In millions, except per share amounts	to options	per share		term (years)	value(1)
Outstanding as of May 31, 2015	2.7	$	31.31
Granted	—	$	—
Exercised	(0.1)	$	31.11
Forfeited	(0.1)	$	29.85
Expired	—	$	—
Outstanding as of May 31, 2016	2.5	$	31.36	5.4	$	57.9
Exercisable as of May 31, 2016	0.4	$	31.22	5.2	$	9.6

(1) Market price of the underlying stock as of May 31, 2016 less the exercise price.

For fiscal 2016, the total intrinsic value of the performance stock options exercised was $1.0 million.

Restricted stock units:  The Board grants restricted stock units (“RSUs”) to non-officer management.  An RSU is an agreement to issue shares at the time of vesting with no associated exercise cost.  For each unit granted, the holder will receive one share of stock at the time of vesting.  RSUs do not have voting rights or earn dividend equivalents during the vesting period. These awards vest 20% per annum over five years. The fair value of RSUs is equal to the closing market price of the underlying common stock as of the date of grant, adjusted for the present value of expected dividends over the vesting period.

The following table summarizes RSU activity for the year ended May 31, 2016:

				Weighted-
		Weighted-		average
		average		remaining
		grant-date		vesting	Aggregate
		fair value		period	intrinsic
In millions, except per share amounts	RSUs	per share		(years)	value(1)
Nonvested as of May 31, 2015	1.8	$	33.57
Granted	0.7	$	42.60
Vested	(0.5)	$	31.34
Forfeited	(0.2)	$	35.97
Nonvested as of May 31, 2016	1.8	$	37.58	3.0	$	96.5

(1) Intrinsic value for RSUs is the market price of the underlying stock as of May 31, 2016.

Other information pertaining to RSUs is as follows:

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Weighted-average grant-date fair value of RSUs granted	$	42.60	$	36.64	$	36.37
Total intrinsic value of RSUs vested	$	25.9	$	21.7	$	18.3
Total grant-date fair value of RSUs vested	$	17.3	$	14.8	$	12.1

Restricted stock awards:  The Board has approved grants of restricted stock awards to the Company’s officers and outside directors. All shares underlying awards of restricted stock are restricted in that they are not transferable until they vest. The recipients of the restricted stock have voting rights and earn dividends, which are paid to the recipient at the time the awards vest. If the recipient leaves Paychex prior to the vesting date for any reason, the shares of restricted stock and the dividends accrued on those shares will be forfeited and returned to Paychex.

Time-vested restricted stock awards granted to officers vest one-third per annum. Restricted stock granted to outside directors vest on the one-year anniversary of the grant date. The fair value of restricted stock awards is equal to the closing market price of the underlying common stock as of the date of grant and is expensed over the requisite service period on a straight-line basis.

The following table summarizes restricted stock activity for the year ended May 31, 2016:

		Weighted-
		average
		grant-date
	Restricted	fair value
In millions, except per share amounts	shares	per share
Nonvested as of May 31, 2015	0.2	$	38.99
Granted	—	$	47.46
Vested	(0.1)	$	37.70
Forfeited	—	$	40.54
Nonvested as of May 31, 2016	0.1	$	43.99

Other information pertaining to restricted stock follows:

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Weighted-average grant-date fair value of restricted stock granted	$	47.46	$	41.70	$	38.53
Total grant-date fair value of restricted stock vested	$	3.0	$	3.5	$	3.3

Performance shares:  Performance shares have a two-year performance period, after which the amount of restricted shares earned will be determined based on achievement against established performance targets. The restricted shares earned will then be subject to a one year service period. Performance shares do not have voting rights or earn dividend equivalents during the performance period. The fair value of performance shares is equal to the closing market price of the underlying common stock as of the date of grant, adjusted for the present value of expected dividends over the performance period.

The following table summarizes performance share activity for the year ended May 31, 2016:

		Weighted-
		average
		grant-date
	Performance	fair value
In millions, except per share amounts	shares	per share
Nonvested as of May 31, 2015	0.6	$	34.24
Granted (1)	0.1	$	42.48
Vested	(0.2)	$	29.10
Forfeited	—	$	37.09
Nonvested as of May 31, 2016	0.5	$	38.89

(1) Performance shares granted assuming achievement of performance goals at target. Actual amount of shares to be earned may differ from this amount.

Non-compensatory employee benefit plan:  Prior to January 1, 2016, the Company offered a non-qualified
Employee Stock Purchase Plan (“ESPP”) to all employees under which the Company’s common stock could be purchased through a payroll deduction with no discount to the market price and no look-back provision. This ESPP was discontinued as of December 31, 2015.  Effective January 1, 2016, the Company began offering a qualified ESPP to all employees.  Under this new ESPP, the Company’s common stock can be purchased through a payroll deduction at a discount to the market price.  The Plan allows for a discount of up to 15% based on the sole discretion of the committee established to administer the plan.  For offering periods during fiscal 2016 the discount was set at 5% of the market price.  Transactions under the non-qualified ESPP occurred directly through the Company’s transfer agent and no brokerage fees were charged to employees, except for when stock was sold.  Transactions under the qualified ESPP occur through the Company’s third party stock plan administrator.  The plans have been deemed non-compensatory and therefore, no stock-based compensation costs have been recognized for fiscal years 2016,  2015, or 2014 related to either plan.

XML

Funds Held for Clients and Corporate Investments

12 Months Ended

May 31, 2016

Funds Held for Clients and Corporate Investments [Abstract]

Funds Held for Clients and Corporate Investments

Note F — Funds Held for Clients and Corporate Investments

Funds held for clients and corporate investments are as follows:

	May 31, 2016
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
In millions	cost		gains		losses		value
Type of issue:
Funds held for clients money market securities and other    cash equivalents	$	502.4	$	—	$	—	$	502.4
Available-for-sale securities:
Corporate bonds		128.4		2.9		(0.1)		131.2
General obligation municipal bonds		1,594.1		27.6		(0.1)		1,621.6
Pre-refunded municipal bonds(1)		60.2		1.4		—		61.6
Revenue municipal bonds		916.2		15.8		(0.2)		931.8
U.S. government agency securities		160.8		0.6		(0.3)		161.1
Variable rate demand notes		1,234.6		—		—		1,234.6
Total available-for-sale securities		4,094.3		48.3		(0.7)		4,141.9
Other		14.2		0.8		(0.1)		14.9
Total funds held for clients and corporate investments	$	4,610.9	$	49.1	$	(0.8)	$	4,659.2

	May 31, 2015
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
In millions	cost		gains		losses		value
Type of issue:
Funds held for clients money market securities and other    cash equivalents	$	1,430.0	$	—	$	—	$	1,430.0
Available-for-sale securities:
General obligation municipal bonds		1,694.0		14.0		(4.3)		1,703.7
Pre-refunded municipal bonds(1)		101.7		1.0		—		102.7
Revenue municipal bonds		960.7		6.1		(3.2)		963.6
Variable rate demand notes		825.6		—		—		825.6
Total available-for-sale securities		3,582.0		21.1		(7.5)		3,595.6
Other		12.7		1.5		—		14.2
Total funds held for clients and corporate investments	$	5,024.7	$	22.6	$	(7.5)	$	5,039.8

(1) Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

Included in money market securities and other cash equivalents as of May 31, 2016 are money market funds and bank demand deposit accounts.  As of May 31, 2015 money market securities and other cash equivalents included money market funds, bank demand deposit accounts, short-term municipal bonds and commercial paper. 

Classification of investments on the Consolidated Balance Sheets is as follows:

	May 31,
In millions	2016		2015
Funds held for clients	$	3,997.5	$	4,273.4
Corporate investments		220.6		366.6
Long-term corporate investments		441.1		399.8
Total funds held for clients and corporate investments	$	4,659.2	$	5,039.8

The Company’s available-for-sale securities reflected a net unrealized gain of $47.6 million as of May 31, 2016 compared with a net unrealized gain of $13.6 million as of May 31, 2015. Included in the net unrealized gain total as of May 31, 2016 and May 31, 2015, there were 63 and 280 available-for-sale securities in an unrealized loss position, respectively. The available-for-sale securities in an unrealized loss position were as follows:

	May 31, 2016
	Securities in an unrealized  loss position for less than  twelve months				Securities in an unrealized  loss position for more than  twelve months				Total
	Gross				Gross				Gross
	unrealized		Fair		unrealized		Fair		unrealized		Fair
In millions	losses		value		losses		value		losses		value
Type of issue:
Corporate bonds		(0.1)		14.7		—		—		(0.1)		14.7
General obligation municipal bonds	$	(0.1)	$	48.9	$	—	$	2.8	$	(0.1)	$	51.7
Pre-refunded municipal bonds		—		5.7		—		—		—		5.7
Revenue municipal bonds		—		20.7		(0.2)		11.7		(0.2)		32.4
U.S. government agency securities		(0.3)		51.1		—		—		(0.3)		51.1
Total	$	(0.5)	$	141.1	$	(0.2)	$	14.5	$	(0.7)	$	155.6

	May 31, 2015
	Securities in an unrealized  loss position for less than  twelve months				Securities in an unrealized  loss position for more than  twelve months				Total
	Gross				Gross				Gross
	unrealized		Fair		unrealized		Fair		unrealized		Fair
In millions	losses		value		losses		value		losses		value
Type of issue:
General obligation municipal bonds	$	(3.8)	$	535.1	$	(0.5)	$	26.3	$	(4.3)	$	561.4
Revenue municipal bonds		(3.2)		361.6		—		—		(3.2)		361.6
Total	$	(7.0)	$	896.7	$	(0.5)	$	26.3	$	(7.5)	$	923.0

The Company regularly reviews its investment portfolios to determine if any investment is other-than-temporarily impaired due to changes in credit risk or other potential valuation concerns. The Company believes that the investments held as of May 31, 2016 that had unrealized losses of $0.7 million were not other-than-temporarily impaired. The Company believes that it is probable that the principal and interest will be collected in accordance with contractual terms, and that the unrealized losses on these securities were due to changes in interest rates and were not due to increased credit risk or other valuation concerns. A significant portion of the securities in an unrealized loss position as of May 31, 2016 and May 31, 2015 held an AA rating or better. The Company does not intend to sell these investments until the recovery of their amortized cost basis or maturity, and further believes that it is not more-likely-than-not that it will be required to sell these investments prior to that time. The Company’s assessment that an investment is not other-than-temporarily impaired could change in the future due to new developments or changes in the Company’s strategies or assumptions related to any particular investment.

Realized gains and losses from the sale of available-for-sale securities were as follows:

	Year ended May 31,
In millions	2016		2015		2014
Gross realized gains	$	0.1	$	0.3	$	0.6
Gross realized losses		—		—		—
Net realized gains	$	0.1	$	0.3	$	0.6

The amortized cost and fair value of available-for-sale securities that had stated maturities as of May 31, 2016 are shown below by contractual maturity. Expected maturities can differ from contractual maturities because borrowers may have the right to prepay obligations without prepayment penalties.

	May 31, 2016
	Amortized		Fair
In millions	cost		value
Maturity date:
Due in one year or less	$	359.6	$	360.7
Due after one year through three years		742.7		749.4
Due after three years through five years		918.5		935.7
Due after five years		2,073.5		2,096.1
Total	$	4,094.3	$	4,141.9

Variable rate demand notes are primarily categorized as due after five years in the table above as the contractual maturities on these securities are typically 20 to 30 years. Although these securities are issued as long-term securities, they are priced and traded as short-term instruments because of the liquidity provided through the tender feature.

XML

Fair Value Measurements

12 Months Ended

May 31, 2016

Fair Value Measurements [Abstract]

Fair Value Measurements

Note G — Fair Value Measurements

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. The accounting standards related to fair value measurements include a hierarchy for information and valuations used in measuring fair value that is broken down into three levels based on reliability, as follows:

· Level 1 valuations are based on quoted prices in active markets for identical instruments that the Company can access at the measurement date.

· Level 2 valuations are based on inputs other than quoted prices included in Level 1 that are observable for the instrument, either directly or indirectly, for substantially the full term of the asset or liability including the following:

o quoted prices for similar, but not identical, instruments in active markets;

o quoted prices for identical or similar instruments in markets that are not active;

o inputs other than quoted prices that are observable for the instrument; or

o inputs that are derived principally from or corroborated by observable market data by correlation or other means.

· Level 3 valuations are based on information that is unobservable and significant to the overall fair value measurement.

The carrying values of cash and cash equivalents, accounts receivable, net of allowance for doubtful accounts, and accounts payable approximate fair value due to the short maturities of these instruments. Marketable securities included in funds held for clients and corporate investments consist primarily of securities classified as available-for-sale and are recorded at fair value on a recurring basis.

The Company’s financial assets and liabilities measured at fair value on a recurring basis were as follows:

	May 31, 2016
			Quoted		Significant
			prices in		other		Significant
	Carrying		active		observable		unobservable
	value		markets		inputs		inputs
In millions	(Fair value)		(Level 1)		(Level 2)		(Level 3)
Assets:
Available-for-sale securities:
Corporate bonds	$	131.2	$	—	$	131.2	$	—
General obligation municipal bonds		1,621.6		—		1,621.6		—
Pre-refunded municipal bonds		61.6		—		61.6		—
Revenue municipal bonds		931.8		—		931.8		—
U.S. government agency securities		161.1		—		161.1		—
Variable rate demand notes		1,234.6		—		1,234.6		—
Total available-for-sale securities	$	4,141.9	$	—	$	4,141.9	$	—
Other	$	14.9	$	14.9	$	—	$	—
Liabilities:
Other long-term liabilities	$	14.9	$	14.9	$	—	$	—

	May 31, 2015
			Quoted		Significant
			prices in		other		Significant
	Carrying		active		observable		unobservable
	value		markets		inputs		inputs
In millions	(Fair value)		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash equivalents:
Commercial paper	$	15.0	$	—	$	15.0	$	—
General obligation municipal bonds		55.1		—		55.1		—
Pre-refunded municipal bonds		20.5		—		20.5		—
Revenue municipal bonds		12.3		—		12.3		—
Money market securities		0.2		0.2		—		—
Total cash equivalents	$	103.1	$	0.2	$	102.9	$	—
Available-for-sale securities:
General obligation municipal bonds	$	1,703.7	$	—	$	1,703.7	$	—
Pre-refunded municipal bonds		102.7		—		102.7		—
Revenue municipal bonds		963.6		—		963.6		—
Variable rate demand notes		825.6		—		825.6		—
Total available-for-sale securities	$	3,595.6	$	—	$	3,595.6	$	—
Other	$	14.2	$	14.2	$	—	$	—
Liabilities:
Other long-term liabilities	$	14.2	$	14.2	$	—	$	—

In determining the fair value of its assets and liabilities, the Company predominately uses the market approach.  Money market securities, which are cash equivalents, are valued based on quoted market prices in active markets.  Time deposits are considered Level 1 investments as they are highly liquid and have a short maturity period, usually no longer than overnight.  Commercial paper is included in Level 2 because it may not trade on a daily basis.  Available-for-sale securities, including municipal bonds, corporate bonds, and U.S. government agency securities, and short-term municipal bonds and short-term U.S. government agency securities with a maturity of less than 90 days included in Level 2 are valued utilizing inputs obtained from an independent pricing service. To determine the fair value of the Company’s Level 2 available-for-sale securities, a variety of inputs are utilized, including benchmark yields, reported trades, non-binding broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data, new issue data, and monthly payment information. The Company has not adjusted the prices obtained from the independent pricing service because it believes that they are appropriately valued.

Assets included as other are mutual fund investments, consisting of participants’ eligible deferral contributions under the Company’s non-qualified and unfunded deferred compensation plans. The related liability is reported as other long-term liabilities. The mutual funds are valued based on quoted market prices in active markets.

The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, although the Company believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

XML

Property and Equipment, Net of Accumulated Depreciation

12 Months Ended

May 31, 2016

Property and Equipment, Net of Accumulated Depreciation [Abstract]

Property and Equipment, Net of Accumulated Depreciation

Note H — Property and Equipment, Net of Accumulated Depreciation

The components of property and equipment, at cost, consisted of the following:

	May 31,
In millions	2016		2015
Land and improvements	$	8.3	$	8.3
Buildings and improvements		103.0		102.1
Data processing equipment		196.1		190.9
Software		447.5		391.8
Furniture, fixtures, and equipment		125.0		145.6
Leasehold improvements		108.2		106.2
Construction in progress		24.1		28.5
Total property and equipment, gross		1,012.2		973.4
Less: Accumulated depreciation		659.2		619.5
Property and equipment, net of accumulated depreciation	$	353.0	$	353.9

Depreciation expense was $99.2 million, $92.1 million, and $89.1 million for fiscal years 2016,  2015, and 2014, respectively.

XML

Goodwill and Intangible Assets, Net of Accumulated Amortization

12 Months Ended

May 31, 2016

Goodwill and Intangible Assets, Net of Accumulated Amortization [Abstract]

Goodwill and Intangible Assets, Net of Accumulated Amortization

Note I — Goodwill and Intangible Assets, Net of Accumulated Amortization

The Company had goodwill balances on its Consolidated Balance Sheets of $657.1 million as of May 31, 2016, and $561.5 million as of May 31, 2015. The increase of $95.6 million in goodwill since May 31, 2015 was the result of the acquisition of substantially all of the net assets of Advance Partners by a wholly owned subsidiary of the Company in December 2015. 

The Company has certain intangible assets with finite lives. The components of intangible assets, at cost, consisted of the following:

	May 31,
In millions	2016		2015
Client lists	$	289.2	$	244.6
Other intangible assets		5.4		3.2
Total intangible assets, gross		294.6		247.8
Less: Accumulated amortization		225.1		215.4
Intangible assets, net of accumulated amortization	$	69.5	$	32.4

During fiscal 2016, the Company acquired intangible assets with weighted-average amortization periods as follows: customer lists —9.7 years; other intangible assets —5.0 years; and total —9.5 years.  Amortization expense relating to intangible assets was $15.9 million, $14.5 million, and $15.9 million for fiscal years 2016,  2015, and 2014, respectively.

The estimated amortization expense for the next five fiscal years relating to intangible asset balances is as follows:

In millions	Estimated amortization
Year ending May 31,	expense
2017	$	17.7
2018		14.1
2019		11.1
2020		8.5
2021		6.5

XML

Income Taxes

12 Months Ended

May 31, 2016

Income Taxes [Abstract]

Income Taxes

Note J — Income Taxes

The components of deferred tax assets and liabilities are as follows:

	May 31,
In millions	2016		2015
Deferred tax assets:
Compensation and employee benefit liabilities	$	21.4	$	20.9
Other current liabilities		7.9		6.9
Tax credit carry forward		40.0		40.1
Depreciation		8.8		11.9
Stock-based compensation		22.0		21.6
Tax benefit of uncertain tax positions		18.6		15.7
Other		7.1		9.2
Gross deferred tax assets		125.8		126.3
Deferred tax liabilities:
Capitalized software		56.3		53.6
Depreciation		2.5		3.8
Goodwill and intangible assets		58.5		52.0
Revenue not subject to current taxes		13.3		13.1
Unrealized gains on available-for-sale securities		17.3		5.3
Other		—		0.3
Gross deferred tax liabilities		147.9		128.1
Net deferred tax liability	$	(22.1)	$	(1.8)

The deferred tax asset related to tax credit carry forward consists of alternative minimum tax credits, which may be carried forward indefinitely.

The components of the provision for income taxes are as follows:

	Year ended May 31,
In millions	2016		2015		2014
Current:
Federal	$	336.4	$	341.4	$	314.5
State		50.8		47.8		51.0
Total current		387.2		389.2		365.5
Deferred:
Federal		5.5		(5.1)		(3.5)
State		1.6		1.0		(1.4)
Total deferred		7.1		(4.1)		(4.9)
Income taxes	$	394.3	$	385.1	$	360.6

A reconciliation of the U.S. federal statutory tax rate to the Company’s effective income tax rate is as follows:

	Year ended May 31,
	2016		2015		2014
Federal statutory tax rate	35.0	%	35.0	%	35.0	%
Increase/(decrease) resulting from:
State income taxes, net of federal tax benefit	3.0	%	3.0	%	3.3	%
Section 199 - Qualified production activities	(2.4)	%	—	%	—	%
Tax-exempt municipal bond interest	(1.4)	%	(1.5)	%	(1.5)	%
Other items	0.1	%	(0.2)	%	(0.3)	%
Effective income tax rate	34.3	%	36.3	%	36.5	%

During fiscal 2016, the Company engaged tax specialists to assess the qualification of its customer-facing computer software for the federal “Qualified Production Activities Deduction” under Internal Revenue Code Section 199, and the regulations thereunder.  Based on this assessment, the Company concluded that certain of its software offerings qualified for this tax deduction for fiscal 2016 and prior tax years that remain open to IRS examination.  The Company submitted claims to recover these tax benefits for prior tax years and will claim the fiscal 2016 tax benefits when it files its fiscal 2016 tax return.  Accordingly, the Company recognized the tax benefits, and related tax reserves, for its qualified customer-facing activities in these years in fiscal 2016.   

Uncertain income tax positions:  The Company is subject to U.S. federal income tax, numerous local and state tax jurisdictions within the U.S., and income taxes in Germany.  The Company maintains a reserve for uncertain tax positions. As of May 31, 2016 and May 31, 2015, the total reserve for uncertain tax positions, including interest and net of federal benefits, was $54.2 million and $29.1 million, respectively, and were included in long-term liabilities on the Consolidated Balance Sheets.

A reconciliation of the beginning and ending amounts of the Company’s gross unrecognized tax benefits, not including interest or other potential offsetting effects, is as follows:

	Year ended May 31,
In millions	2016		2015		2014
Balance as of beginning of fiscal year	$	39.9	$	40.0	$	26.7
Additions for tax positions of the current year		7.3		6.7		11.2
Additions for tax positions of prior years		20.7		0.8		4.2
Reductions for tax positions of prior years		(0.1)		(0.4)		(1.8)
Settlements with tax authorities		(2.2)		(1.2)		—
Expiration of the statute of limitations		(0.9)		(6.0)		(0.3)
Balance as of end of fiscal year	$	64.7	$	39.9	$	40.0

The reserve as of May 31, 2016 substantially relates to the Company’s uncertain tax positions for certain federal and state income tax matters.  The Company believes the reserve for uncertain tax positions, including interest and net of federal benefits, of $54.2 million as of May 31, 2016 adequately covers open tax years and uncertain tax positions up to and including fiscal 2016 for major taxing jurisdictions. As of May 31, 2016 and May 31, 2015, the entire $54.2 million and $29.1 million, respectively, of unrecognized tax benefits, if recognized, would impact the Company’s effective income tax rate.

The Company has concluded all U.S. federal income tax matters through the fiscal year ended May 31, 2011. Fiscal years 2012 through 2014 are currently under audit by the IRS and fiscal years 2015 and 2016 are subject to potential audit. With limited exception, state income tax audits by taxing authorities are closed through the fiscal year ended May 31, 2011, primarily due to expiration of the statute of limitations.

The Company continues to follow its policy of recognizing interest and penalties accrued on tax positions as a component of income taxes on the Consolidated Statements of Income and Comprehensive Income. The amount of accrued interest and penalties associated with the Company’s tax positions is immaterial to the Consolidated Balance Sheets. The amount of interest and penalties recognized for fiscal years 2016,  2015, and 2014 was immaterial to the Company’s results of operations.

XML

Accumulated Other Comprehensive Income

12 Months Ended

May 31, 2016

Accumulated Other Comprehensive Income [Abstract]

Accumulated Other Comprehensive Income

Note K — Accumulated Other Comprehensive Income

The change in unrealized gains and losses, net of applicable taxes, related to available-for-sale securities is the primary component reported in accumulated other comprehensive income in the Consolidated Balance Sheets. The changes in accumulated other comprehensive income are as follows:

	Year ended May 31,
In millions	2016		2015		2014
Beginning balance	$	7.5	$	21.5	$	22.0
Other comprehensive income/(loss):
Unrealized holding gains/(losses)		34.2		(21.5)		0.3
Income tax (expense)/benefit related to unrealized holding gains/(losses)		(12.4)		7.7		(0.4)
Reclassification adjustment for the net gain on sale of available-for-sale    securities realized in net income		(0.1)		(0.3)		(0.6)
Income tax expense on reclassification adjustment for the net gain on    sale of available-for-sale securities		—		0.1		0.2
Total other comprehensive income/(loss), net of tax		21.7		(14.0)		(0.5)
Ending balance	$	29.2	$	7.5	$	21.5
Total tax expense/(benefit) included in other comprehensive income/(loss)	$	12.4	$	(7.8)	$	0.2

Reclassification adjustments out of accumulated other comprehensive income are for realized gains on the sales of available-for-sale securities and impacted interest on funds held for clients on the Consolidated Statements of Income and Comprehensive Income.

XML

Supplemental Cash Flow Information

12 Months Ended

May 31, 2016

Supplemental Cash Flow Information [Abstract]

Supplemental Cash Flow Information

Note L — Supplemental Cash Flow Information

Income taxes paid were $369.9 million, $372.8 million, and $317.8 million for fiscal years 2016,  2015, and 2014, respectively.

Lease incentives received in the form of tenant allowances and free rent were $4.3 million, $8.5 million, and $6.7 million for fiscal years 2016,  2015, and 2014, respectively.

XML

Employee Benefit Plans

12 Months Ended

May 31, 2016

Employee Benefit Plans [Abstract]

Employee Benefit Plans

Note M — Employee Benefit Plans

401(k) plan:  The Company maintains a contributory savings plan that qualifies under section 401(k) of the Internal Revenue Code. The Paychex, Inc. 401(k) Incentive Retirement Plan (the “Plan”) allows all employees to immediately participate in the salary deferral portion of the Plan, contributing up to a maximum of 50% of their salary, subject to Internal Revenue Service limitations. Employees who have completed one year of service and a minimum of 1,000 hours worked are eligible to receive a company matching contribution, when such contribution is in effect.  The Company provided matching contributions of 50% of up to 8% of eligible pay that an employee contributed to the Plan, effective for pay dates on or after November 15, 2013 and 50% of up to 6% of eligible pay that an employee contributed to the Plan between February 2012 and November 2013.  Company contributions to the Plan for fiscal years 2016,  2015, and 2014 were $21.4 million, $19.6 million, and $16.4 million, respectively.

The Plan is 100% participant directed. Plan participants can fully diversify their portfolios by choosing from any or all investment fund choices in the Plan. Transfers in and out of investment funds, including the Paychex, Inc. Employee Stock Ownership Plan (“ESOP”) Stock Fund, are not restricted, with the exception of certain restricted trading periods for individuals designated as insiders as specified in the Company’s Insider Trading Policy. The Company match contribution, when in effect, follows the same fund elections as the employee compensation deferrals.

Deferred compensation plans:  The Company offers non-qualified and unfunded deferred compensation plans to a select group of key employees, executive officers, and outside directors. Eligible employees are provided with the opportunity to defer up to 50% of their annual base salary and bonus and outside directors may defer 100% of their Board cash compensation. Gains and losses are credited based on the participant’s election of a variety of investment choices. The Company does not match any participant deferral or guarantee its return. Distributions are paid at one of the following dates selected by the participant: the participant’s termination date, the date the participant retires from any active employment, or a designated specific date.  The amounts accrued under these plans were $14.9 million and $14.2 million as of May 31, 2016 and May 31, 2015, respectively, and are reflected in other long-term liabilities on the accompanying Consolidated Balance Sheets.

XML

Commitments and Contingencies

12 Months Ended

May 31, 2016

Commitments and Contingencies [Abstract]

Commitments and Contingencies

Note N — Commitments and Contingencies

Lines of credit:  As of May 31, 2016, the Company had unused borrowing capacity available under uncommitted, secured, short-term lines of credit at market rates of interest with financial institutions as follows:

Financial institution	Amount available	Expiration date
JP Morgan Chase Bank, N.A.	$350 million	February 27, 2017
Bank of America, N.A.	$250 million	February 28, 2017
PNC Bank, National Association	$150 million	February 27, 2017
Wells Fargo Bank, National Association	$150 million	February 27, 2017

The credit facilities are evidenced by promissory notes and are secured by separate pledge security agreements by and between Paychex and each of the financial institutions (the “Lenders”), pursuant to which the Company has granted each of the Lenders a security interest in certain investment securities accounts. The collateral is maintained in a pooled custody account pursuant to the terms of a control agreement and is to be administered under an intercreditor agreement among the Lenders. Under certain circumstances, individual Lenders may require that collateral be transferred from the pooled account into segregated accounts for the benefit of such individual Lenders.

The primary uses of the lines of credit would be to meet short-term funding requirements related to deposit account overdrafts and client fund obligations arising from electronic payment transactions on behalf of clients in the ordinary course of business, if necessary. No amounts were outstanding against these lines of credit during fiscal 2016 or as of May 31, 2016.

Certain of the financial institutions are also parties to the Company’s credit facility and irrevocable standby letters of credit, which are discussed below.

Credit facilities:  On August 5, 2015, the Company entered into a committed, unsecured, five-year syndicated credit facility, expiring on August 5, 2020.  Under the credit facility, Paychex of New York LLC (the “Borrower”) may, subject to certain restrictions, borrow up to $1 billion to meet short-term funding requirements.  The obligations under this facility have been guaranteed by the Company and certain of its subsidiaries.  The outstanding obligations under this credit facility will bear interest at competitive rates to be elected by the Borrower.  Upon expiration of the commitment in August 2020, any borrowings outstanding will mature and be payable on such date.  This agreement supersedes the $750 million credit facility agreement set to expire on June 21, 2018, which was terminated as part of the new agreement.

There were no amounts outstanding under this credit facility as of May 31, 2016.  During fiscal 2016,  the Company borrowed against this facility, and its predecessor facility, for one-day periods each, from one to two times a quarter as follows:

$ in millions	2016				2015
Number of days borrowed		5			2
Maximum amount borrowed	$	450.0		$	150.0
Average amount borrowed	$	305.0		$	125.0
Weighted-average interest rate		3.39	%		3.25	%

The Company subsequently borrowed $100 million for one day under this line in June 2016.

The credit facility contains various financial and operational covenants that are usual and customary for such arrangements.  The Borrower was in compliance with these covenants during fiscal 2016. 

Certain lenders under this credit facility, and their respective affiliates, have performed, and may in the future perform for the Company and its subsidiaries, various commercial banking, investment banking, underwriting, and other financial advisory services, for which they have received, and will continue to receive in the future, customary fees and expenses.

In March 2016, the Company entered into a committed, unsecured, three-year credit facility with PNC Bank, National Association, expiring on March 17, 2019.   Under the credit facility, Paychex Advance LLC may, subject to certain restrictions, borrow up to $150 million to finance working capital needs and general corporate purposes.  The obligations under this facility have been guaranteed by the Company and certain of its subsidiaries.  The outstanding obligations under this credit facility will bear interest at competitive rates to be elected by the Borrower.  Upon expiration of the commitment in March 2019, any borrowings outstanding will mature and be payable on such date.

There were no amounts outstanding under this credit facility as of May 31, 2016.  Paychex Advance subsequently borrowed approximately $56 million under this line, which remains outstanding as of the date of this report.

Letters of credit:  The Company had irrevocable standby letters of credit outstanding totaling $43.0 million both as of May 31, 2016 and May 31, 2015, required to secure commitments for certain insurance policies. The letters of credit expire at various dates between July 2016 and April 2017, and are collateralized by securities held in the Company’s investment portfolios. No amounts were outstanding on these letters of credit during fiscal 2016 or as of May 31, 2016. Subsequent to May 31, 2016, the letter of credit expiring in July 2016 was renewed through July 2017.

Contingencies:   The Company is subject to various claims and legal matters that arise in the normal course of its business. These include disputes or potential disputes related to breach of contract, tort, breach of fiduciary duty, employment-related claims, tax claims, and other matters.

The Company’s management currently believes that resolution of outstanding legal matters will not have a material adverse effect on the Company’s financial position or results of operations. However, legal matters are subject to inherent uncertainties and there exists the possibility that the ultimate resolution of these matters could have a material adverse impact on the Company’s financial position and the results of operations in the period in which any such effect is recorded.

Lease commitments:  The Company leases office space and data processing equipment under terms of various operating leases. Rent expense for fiscal years 2016,  2015, and 2014 was $39.8 million, $39.4 million, and $39.1 million, respectively. As of May 31, 2016, future minimum lease payments under various non-cancelable operating leases with terms of more than one year are as follows:

		Minimum
In millions		lease
Year ending May 31,		payments
2017	$	35.7
2018		28.5
2019		20.0
2020		12.9
2021		7.4
Thereafter		2.2

Other commitments:    As of May 31, 2016, the Company had outstanding commitments under purchase orders and legally binding contractual arrangements with minimum future payment obligations of approximately $109.6 million, including $6.8 million of commitments to purchase capital assets. These minimum future payment obligations relate to the following fiscal years:

	Minimum
In millions	payment
Year ending May 31,	obligation
2017	$	73.5
2018		20.5
2019		7.6
2020		4.4
2021		3.0
Thereafter		0.6

In the normal course of business, the Company makes representations and warranties that guarantee the performance of services under service arrangements with clients. Historically, there have been no material losses related to such guarantees. In addition, the Company has entered into indemnification agreements with its officers and directors, which require the Company to defend and, if necessary, indemnify these individuals for certain pending or future claims as they relate to their services provided to the Company.

Paychex currently self-insures the deductible portion of various insured exposures under certain employee benefit plans. The Company’s estimated loss exposure under these insurance arrangements is recorded in other current liabilities on the Consolidated Balance Sheets. Historically, the amounts accrued have not been material and are not material as of the reporting date. The Company also maintains insurance coverage in addition to its purchased primary insurance policies for gap coverage for employment practices liability, errors and omissions, warranty liability, theft and embezzlement, cyber threats, and acts of terrorism; and capacity for deductibles and self-insured retentions through its captive insurance company.

XML

Related Parties

12 Months Ended

May 31, 2016

Related Parties [Abstract]

Related Parties

Note O — Related Parties

During fiscal years 2016,  2015, and 2014, the Company purchased approximately $4.9 million, $6.9 million, and $4.7 million, respectively, of data processing equipment and software from EMC Corporation. The Chairman, President, and Chief Executive Officer of EMC Corporation is a member of the Company’s Board.

During fiscal years 2016,  2015, and 2014, the Company purchased approximately $2.3 million, $1.7 million, and $1.3 million, respectively, of office supplies from Staples, Inc. The Vice Chairman of Staples, Inc. is a member of the Company’s Board.

XML

Quarterly Financial Data

12 Months Ended

May 31, 2016

Quarterly Financial Data [Abstract]

Quarterly Financial Data

Note P — Quarterly Financial Data (Unaudited)

In millions, except per share amounts

	Three Months Ended
Fiscal 2016	August 31		November 30		February 29		May 31		Full Year
Service revenue	$	712.2	$	711.3	$	740.7	$	741.6	$	2,905.8
Interest on funds held for clients		10.8		11.1		11.9		12.3		46.1
Total revenue	$	723.0	$	722.4	$	752.6	$	753.9	$	2,951.9
Operating income	$	296.1	$	294.2	$	280.0	$	276.3	$	1,146.6
Investment income/(loss), net		1.4		1.6		1.7		(0.2)		4.5
Income before income taxes		297.5		295.8		281.7		276.1		1,151.1
Income taxes		88.4		106.6		101.3		98.0		394.3
Net income	$	209.1	$	189.2	$	180.4	$	178.1	$	756.8
Basic earnings per share(1)	$	0.58	$	0.52	$	0.50	$	0.49	$	2.10
Diluted earnings per share(1)	$	0.58	$	0.52	$	0.50	$	0.49	$	2.09
Weighted-average common shares    outstanding		361.1		360.7		360.5		360.3		360.7
Weighted-average common shares    outstanding, assuming dilution		362.8		362.3		362.2		360.7		362.5
Cash dividends per common share	$	0.42	$	0.42	$	0.42	$	0.42	$	1.68
Total net realized gains(2)	$	—	$	—	$	0.1	$	—	$	0.1

	Three Months Ended
Fiscal 2015	August 31		November 30		February 28		May 31		Full Year
Service revenue	$	656.6	$	665.9	$	693.6	$	681.4	$	2,697.5
Interest on funds held for clients		10.2		10.4		10.7		10.8		42.1
Total revenue	$	666.8	$	676.3	$	704.3	$	692.2	$	2,739.6
Operating income	$	267.5	$	270.2	$	264.3	$	251.6	$	1,053.6
Investment income, net		1.4		1.4		1.6		2.0		6.4
Income before income taxes		268.9		271.6		265.9		253.6		1,060.0
Income taxes		97.6		98.6		96.5		92.4		385.1
Net income	$	171.3	$	173.0	$	169.4	$	161.2	$	674.9
Basic earnings per share(1)	$	0.47	$	0.48	$	0.47	$	0.44	$	1.86
Diluted earnings per share(1)	$	0.47	$	0.47	$	0.46	$	0.44	$	1.85
Weighted-average common shares    outstanding		363.1		363.0		363.2		362.3		362.9
Weighted-average common shares    outstanding, assuming dilution		364.7		364.6		365.0		364.5		364.6
Cash dividends per common share	$	0.38	$	0.38	$	0.38	$	0.38	$	1.52
Total net realized gains(2)	$	0.1	$	0.1	$	—	$	0.1	$	0.3

(1) Each quarter is a discrete period and the sum of the four quarters’ basic and diluted earnings per share amounts may not equal the full year amount.

(2) Total net realized gains on the combined funds held for clients and corporate investment portfolios.

XML

Valuation and Qualifying Accounts

12 Months Ended

May 31, 2016

Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

Schedule II — Valuation and Qualifying Accounts

PAYCHEX, INC.

CONSOLIDATED FINANCIAL STATEMENT SCHEDULE

FOR THE YEAR ENDED MAY 31,

(In millions)

					Additions to/
	Balance as of		Additions		(Deductions				Balance as
	beginning		charged to		from) other		Costs and		of end
Description	of fiscal year		expenses		accounts(1)		deductions(2)		of fiscal year
2016
Allowance for doubtful accounts	$	1.4	$	2.5	$	2.0	$	1.7	$	4.2
Reserve for client fund losses	$	1.8	$	2.4	$	—	$	2.2	$	2.0
2015
Allowance for doubtful accounts	$	1.5	$	1.6	$	0.1	$	1.8	$	1.4
Reserve for client fund losses	$	1.9	$	2.0	$	(0.2)	$	1.9	$	1.8
2014
Allowance for doubtful accounts	$	1.0	$	2.5	$	—	$	2.0	$	1.5
Reserve for client fund losses	$	2.4	$	2.2	$	—	$	2.7	$	1.9

(1) Amounts related to business acquisitions.

(2) Uncollectible amounts written off, net of recoveries.

XML

Description of Business, Basis of Presentation, and Significant Accounting Policies (Policies)

12 Months Ended

May 31, 2016

Description of Business, Basis of Presentation, and Significant Accounting Policies [Abstract]

Description of Business

Description of business:  Paychex, Inc. and its wholly owned subsidiaries (collectively the “Company” or “Paychex”) is a leading provider of integrated human capital management (“HCM”) solutions for payroll, human resource, retirement, and insurance services for small- to medium-sized businesses in the United States (“U.S.”). The Company also has operations in Germany.

Paychex, a Delaware corporation formed in 1979, reports as one segment. Substantially all of the Company’s revenue is generated within the U.S. The Company also generates revenue within Germany, which represented less than one percent of the Company's total revenue for each of the years ended May 31, 2016 (“fiscal 2016”), 2015 (“fiscal 2015”), and 2014 (“fiscal 2014”). Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company as of May 31, 2016 and May 31, 2015. In addition, the Company has equity method investments for a joint-venture in Brazil and a minority investment in a Canadian entity, neither of which is significant.

Total revenue is comprised of service revenue and interest on funds held for clients. Service revenue is comprised primarily of the fees earned on our portfolio of HCM services, which include payroll processing and complementary human resource management and administration services. Payroll service revenue is earned primarily from payroll processing, payroll tax administration services, employee payment services, and other ancillary services. Payroll processing services include the calculation, preparation, and delivery of employee payroll checks; production of internal accounting records and management reports; preparation of federal, state, and local payroll tax returns; and collection and remittance of clients’ payroll obligations.

Our Human Resource Services (“HRS”) portfolio of services and products provide small- to medium-sized businesses with retirement services administration, insurance services, HR administration services, and other human resource services and products. Our comprehensive human resource outsourcing service is available through Paychex HR Solutions, an administrative services organization (“ASO”), and Paychex PEO, a professional employer organization (“PEO”). Both options offer businesses a combined package of services that includes payroll, employer compliance, human resource and employee benefits administration, risk management outsourcing, and the on-site availability of a professionally trained human resource services representative, among other services. These comprehensive bundles of services are designed to make it easier for businesses to manage their payroll and related benefits costs while providing a benefits package equal to that of larger companies. The PEO differs from the ASO in that Paychex serves as a co-employer of the clients’ employees, offers health care coverage to PEO client employees, and assumes the risks and rewards of workers’ compensation insurance and certain health insurance products. PEO services are sold through the Company’s registered and licensed subsidiary, Paychex Business Solutions, Inc. Paychex HR Essentials is an ASO product that provides support to the Company’s clients over the phone or online to help manage employee-related topics.

In connection with the automated payroll tax administration services, the Company electronically collects payroll taxes from clients’ bank accounts, typically on payday, prepares and files the applicable tax returns, and remits taxes to the applicable tax or regulatory agencies on the respective due dates. These taxes are typically paid between one and 30 days after receipt of collections from clients, with some items extending to 90 days. The Company handles regulatory correspondence, amendments, and penalty and interest disputes, and is subject to cash penalties imposed by tax or regulatory agencies for late filings and late or under payment of taxes. With employee payment services, employers are offered the option of paying their employees by direct deposit, payroll debit card, a check drawn on a Paychex account (Readychex®), or a check drawn on the employer’s account and electronically signed by Paychex. For the first three methods, Paychex electronically collects net payroll from the clients’ bank accounts, typically one business day before payday, and provides payment to the employees on payday.

The Company earns fees for funding of temporary staffing agencies payroll via purchasing of accounts receivable invoices.  The fees are deducted from the funding payment and revenue is recognized over an average collection period of 45 to 60 days.

In addition to service fees paid by clients, the Company earns interest on funds held for clients that are collected before due dates and invested until remittance to the applicable tax or regulatory agencies or client employees. The funds held for clients and related client fund obligations are included in the Consolidated Balance Sheets as current assets and current liabilities, respectively. The amount of funds held for clients and related client fund obligations varies significantly during the year.

Basis of Presentation

Basis of presentation:  The consolidated financial statements include the accounts of Paychex, Inc. and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Subsequent Events

Subsequent Events:  The Company has evaluated subsequent events for potential recognition and/or disclosure through the date of issuance of these financial statements.  On July 7, 2016, Paychex announced that the Board of Directors (the “Board”) approved a $0.04 increase in the Company’s regular quarterly dividend, an increase of 10%.  The quarterly dividend will go from $0.42 per share to $0.46 per share and is payable on August 25, 2016 to shareholders of record on August 1, 2016. 

Cash and Cash Equivalents

Cash and cash equivalents:  Cash and cash equivalents consist of available cash, money market securities, and other investments with a maturity of 90 days or less at acquisition.

Accounts Receivable, Net of Allowance for Doubtful Accounts

Accounts receivable, net of allowance for doubtful accounts:  Accounts receivable balances are shown on the Consolidated Balance Sheets net of the allowance for doubtful accounts of $4.2 million as of May 31, 2016 and $1.4 million as of May 31, 2015. Accounts receivable balances, net of allowance for doubtful accounts, include: 1) trade receivables for services provided to clients of $221.6 million as of May 31, 2016 and $176.6 million as of May 31, 2015; and 2) purchased receivables related to funding arrangements with clients, resulting from the acquisition of Advance Partners in December 2015, of $187.0 million as of May 31, 2016. Accounts receivable are written off and charged against the allowance for doubtful accounts when the Company has exhausted all collection efforts without success. No single client had a material impact on total accounts receivable, service revenue, or results of operations.

Funds Held for Clients and Corporate Investments

Funds held for clients and corporate investments:  Marketable securities included in funds held for clients and corporate investments consist primarily of securities classified as available-for-sale and are recorded at fair value obtained from an independent pricing service. The funds held for clients portfolio also includes cash, money market securities, and short-term investments. Unrealized gains and losses, net of applicable income taxes, are reported as other comprehensive income in the Consolidated Statements of Income and Comprehensive Income. Realized gains and losses on the sale of available-for-sale securities are determined by specific identification of the cost basis of each security. On the Consolidated Statements of Income and Comprehensive Income, realized gains and losses from the funds held for client portfolio and corporate investment portfolio are included in interest on funds held for clients and investment income, net, respectively.

Concentrations

Concentrations:  Substantially all of the Company’s deposited cash is maintained at large well-capitalized (as defined by their regulators) financial institutions. These deposits may exceed the amount of any insurance provided. All of the Company’s deliverable securities, primarily municipal bond securities, are held in custody with certain of the aforementioned financial institutions, for which that institution bears the risk of custodial loss. Non-deliverable securities, primarily time deposits and money market funds, are held by well-capitalized financial institutions.

Property and Equipment, Net of Accumulated Depreciation

Property and equipment, net of accumulated depreciation:  Property and equipment is stated at cost, less accumulated depreciation. Depreciation is based on the estimated useful lives of property and equipment using the straight-line method. The estimated useful lives of depreciable assets are generally as follows:

Category	Depreciable life
Buildings and improvements	Ten to 35 years or the remaining life, whichever is shorter
Data processing equipment	Three to four years
Furniture, fixtures, and equipment	Three to seven years
Leasehold improvements	Ten years or the life of the lease, whichever is shorter

Normal and recurring repairs and maintenance costs are charged to expense as incurred. The Company reviews the carrying value of property and equipment for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable.

Software Development and Enhancements

Software development and enhancements:  Expenditures for software purchases and software developed for internal use are capitalized and depreciated on a straight-line basis over the estimated useful lives, which are generally three to five years. Software developed as part of the Company's main processing platform is depreciated over fifteen years.  For software developed for internal use, certain costs are capitalized, including external direct costs of materials and services associated with developing or obtaining the software, and payroll and payroll-related costs for employees who are directly associated with internal-use software projects. Capitalization of these costs ceases no later than the point at which the project is substantially complete and ready for its intended use. Costs associated with preliminary project stage activities, training, maintenance, and other post-implementation stage activities are expensed as incurred. The carrying value of software and development costs is reviewed for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable.

Goodwill and Other Intangible Assets, Net of Accumulated Amortization

Goodwill and other intangible assets, net of accumulated amortization:  The Company has $657.1 million and $561.5 million of goodwill as of May 31, 2016 and 2015, respectively. Goodwill is not amortized, but instead is tested for impairment on an annual basis and between annual tests if an event occurs or circumstances change in a way to indicate that there has been a potential decline in the fair value of a reporting unit.  We performed our annual impairment testing in our fiscal fourth quarter.  A quantitative analysis was performed for our German reporting unit.  For all other reporting units, we utilized a qualitative assessment to determine if it more-likely-than-not that the fair value of the reporting unit had declined below its carrying value.  The assessment considered various financial, macroeconomic, industry, and reporting unit specific qualitative factors.  Based on the results of our testing, no impairment loss was recognized in the results of operations for fiscal years 2016,  2015, or 2014. Subsequent to the latest review, there have been no events or circumstances that indicate any potential impairment of the Company’s goodwill balance.

Intangible assets are comprised primarily of client list acquisitions and are reported net of accumulated amortization on the Consolidated Balance Sheets. Intangible assets are amortized over periods generally ranging from three to twelve years. Client lists use an accelerated method, while other intangible assets use the straight-line method of amortization. The Company tests intangible assets for potential impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable.

Revenue Recognition

Revenue recognition:  Revenues are primarily attributable to fees for providing services as well as investment income earned on funds held for clients.  Fees associated with services are recognized in the period services are rendered and earned under service arrangements with clients where service fees are fixed or determinable and collectability is reasonably assured. Certain processing services are provided under annual service arrangements with revenue recognized ratably over the service period. The Company’s service revenue is largely attributable to processing services where the fee is based on a fixed amount per processing period or a fixed amount per processing period plus a fee per employee or transaction processed. Fees earned for funding of payrolls for temporary staffing agency clients via the purchase of accounts receivable invoices are based on a percentage of funding amounts as specified in the client contract. These fees are then recognized over the average collection period of 45 to 60 days.  The revenue earned from delivery service for the distribution of certain client payroll checks and reports is included in service revenue, and the costs for the delivery are included in operating expenses on the Consolidated Statements of Income and Comprehensive Income.

For certain of the Company's service offerings, it receives advance payments for set-up fees from its clients.  The Company defers revenue associated with these advance payments, recognizing the revenue and related expenses over the expected life of its clients.

PEO revenue is included in service revenue and is reported net of certain direct pass-through costs billed and incurred, which primarily include payroll wages, payroll taxes, and certain benefit premiums.  Direct costs related to certain benefit plans where the Company retains risk are recognized as operating expenses rather than as a reduction in service revenue. Direct pass-through costs billed and incurred that were a reduction in service revenue were $5.1 billion, $4.2 billion, and $3.4 billion for fiscal years 2016,  2015, and 2014, respectively.

Interest on funds held for clients is earned primarily on funds that are collected from clients before due dates for payroll tax administration services and for employee payment services, and invested until remittance to the applicable tax or regulatory agencies or client employees. The interest earned on these funds is included in total revenue on the Consolidated Statements of Income and Comprehensive Income because the collecting, holding, and remitting of these funds are components of providing these services. Interest on funds held for clients also includes net realized gains and losses from the sales of available-for-sale securities.

PEO Insurance Reserves

PEO insurance reserves:  As part of the PEO service, the Company offers workers’ compensation insurance and health insurance to client companies for the benefit of client employees. Workers' compensation insurance is provided under a fully insured high deductible workers’ compensation policy with a national insurance carrier. Workers’ compensation insurance reserves are established to provide for the estimated costs of paying claims up to per occurrence liability limits. In establishing the PEO workers' compensation insurance reserves, the Company uses an independent actuarial estimate of undiscounted future cash payments that would be made to settle the claims.

The Company’s maximum individual claims liability was $1.3 million and $1.0 million under its fiscal 2016 and fiscal 2015 workers' compensation policies, respectively. As of May 31, 2016 and May 31, 2015, the Company had recorded current liabilities of $13.8 million and $11.3 million, respectively, and long-term liabilities of $18.4 million and $15.3 million,  respectively, on its Consolidated Balance Sheets for workers’ compensation costs.

With respect to the PEO health insurance, the Company offers various health insurance plans that take the form of either fully insured fixed cost plans with various national insurance carriers or a fully insured minimum premium insurance arrangement with coverage provided through a single national carrier. Under the minimum premium arrangement, the Company's health benefits insurance reserves are established to provide for the payment of claims liability charges in accordance with its service contract with the carrier. The claims liability charges include estimates for reported losses, plus amounts for those claims incurred but not reported, and estimates of certain expenses associated with processing and settling the claims.  The Company's maximum individual claims liability is $0.3 million under both its calendar 2016 and 2015 minimum premium health insurance plan policies.  Amounts accrued related to the health insurance reserves are $9.5 million and $8.1 million as of May 31, 2016 and May 31, 2015, respectively. These amounts are included in current liabilities on the Consolidated Balance Sheets.

Estimating the ultimate cost of future claims is an uncertain and complex process based upon historical loss experience and actuarial loss projections, and is subject to change due to multiple factors, including economic trends, changes in legal liability law, and damage awards, all of which could materially impact the reserves as reported in the consolidated financial statements.  Accordingly, final claim settlements may vary from the present estimates, particularly with workers' compensation insurance where those payments may not occur until well into the future.  The Company regularly reviews the adequacy of its estimated insurance reserves.  Adjustments to previously established reserves are reflected in the results of operations for the period in which the adjustment is identified. Such adjustments could be significant, reflecting any combination of new and adverse or favorable trends.

Stock-Based Compensation Costs

Stock-based compensation costs:  All stock-based awards to employees are recognized as compensation costs in the consolidated financial statements based on their fair values measured as of the date of grant. The Company estimates the fair value of stock option grants using a Black-Scholes option pricing model. This model requires various assumptions as inputs including expected volatility of the Paychex stock price and expected option life. Volatility is estimated based on a combination of historical volatility, using stock prices over a period equal to the expected option life, and implied market volatility. Expected option life is estimated based on historical exercise behavior.  The Company periodically reassesses its assumptions as well as its choice of valuation model.  The Company will reconsider use of this model if additional information becomes available in the future indicating that another model would provide a more accurate estimate of fair value, or if characteristics of future grants would warrant such a change.

The fair value of stock awards is determined based on the stock price at the date of grant.  For grants that do not accrue dividends or dividend equivalents, the fair value is the stock price reduced by the present value of estimated dividends over the vesting period or performance period.

The Company is required to estimate forfeitures and only record compensation costs for those awards that are expected to vest. The assumptions for forfeitures were determined based on type of award and historical experience. Forfeiture assumptions are adjusted at the point in time a significant change is identified, with any adjustment recorded in the period of change, and the final adjustment at the end of the requisite service period to equal actual forfeitures.

The assumptions of volatility, expected option life, and forfeitures all require significant judgment and are subject to change in the future due to factors such as employee exercise behavior, stock price trends, and changes to type or provisions of stock-based awards. Any material change in one or more of these assumptions could have an impact on the estimated fair value of a future award.

Refer to Note E for further discussion of the Company’s stock-based compensation plans.

Income Taxes

Income taxes:  The Company accounts for deferred taxes by recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the consolidated financial statements or tax returns. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities, using enacted tax rates in effect for the year in which the differences are expected to reverse. The Company records a deferred tax asset related to the stock-based compensation costs recognized for certain stock-based awards. At the time of the exercise of non-qualified stock options or vesting of stock awards, the Company accounts for the resulting tax deduction by reducing its accrued income tax liability with an offset to the deferred tax asset and any excess of the tax benefit over the deferred tax asset as an increase to additional paid-in capital. The Company currently has a sufficient pool of excess tax benefits in additional paid-in capital to absorb any deficiency in tax benefits that fall short of the related deferred tax asset related to stock-based awards.

The Company also maintains a reserve for uncertain tax positions. The Company evaluates tax positions taken or expected to be taken in a tax return for recognition in its consolidated financial statements. Prior to recording the related tax benefit in the consolidated financial statements, the Company must conclude that tax positions will be more-likely-than-not to be sustained, assuming those positions will be examined by taxing authorities with full knowledge of all relevant information. The benefit recognized in the consolidated financial statements is the amount the Company expects to realize after examination by taxing authorities. If a tax position drops below the more-likely-than-not standard, the benefit can no longer be recognized. Assumptions, judgment, and the use of estimates are required in determining if the more-likely-than-not standard has been met when developing the provision for income taxes and in determining the expected benefit. A change in the assessment of the more-likely-than-not standard could materially impact the Company’s results of operations or financial position. The Company’s reserve for uncertain tax positions, including interest and net of federal benefits, was $54.2 million as of May 31, 2016 and $29.1 million as of May 31, 2015. Refer to Note J for further discussion of the Company’s reserve for uncertain tax positions.

Use of Estimates

Use of estimates:  The preparation of financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires management to make estimates, judgments, and assumptions that affect reported amounts of assets, liabilities, revenue, and expenses during the reporting period. Actual amounts and results could differ from these estimates.

Reclassifications

Reclassifications:  Certain prior period amounts have been reclassified to conform to the current period presentation and had no effect on reported consolidated earnings.

Recently Adopted and Recently Issued Accounting Pronouncements

Recently adopted accounting pronouncements:  In March 2016, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”)  No. 2015-17 “Income Taxes (Topic 740) - Balance Sheet Classification of Deferred Taxes.” This guidance requires deferred tax assets and liabilities be classified as non-current in a classified statement of financial position. This guidance is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2016, with early application permitted as of the beginning of an interim or annual reporting period. With the adoption, the Company’s deferred tax assets and liabilities were classified as non-current on its Consolidated Balance Sheet and prior period amounts have been reclassified to conform with current year presentation. Adoption of this guidance did not materially impact its consolidated financial statements.

Recently issued accounting pronouncements:  In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606).”  This guidance supersedes current guidance on revenue recognition in Topic 605, “Revenue Recognition.”  In addition, there are disclosure requirements related to the nature, amount, timing, and uncertainty of revenue recognition.  This guidance will be effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods. Early application of the guidance is permitted for annual reporting periods beginning after December 31, 2016.  Additional ASUs have been issued to amend or clarify this ASU as follows:

· ASU No. 2016-12 “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients” was issued in May 2016. ASU No. 2016-12 amends the new revenue recognition standard to clarify the guidance on assessing collectability, presenting sales taxes, measuring noncash consideration, and certain transition matters.

· ASU No. 2016-10 “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing” was issued in April 2016. ASU No. 2016-10 addresses implementation issues identified by the FASB-International Accounting Standards Board Joint Transition Resource Group for Revenue Recognition (TRG). 

· ASU No. 2016-08 “Revenue from Contracts with Customers (Topic 606) - Principal versus Agent Considerations (Reporting Revenue Gross versus Net)” was issued in March 2016.   ASU No. 2016-08 requires an entity to determine whether the nature of its promise to provide goods or services to a customer is performed in a principal or agent capacity and to recognize revenue in a gross or net manner based on its principal/agent designation.

This guidance in these ASUs for revenue recognition is applicable to the Company's fiscal year beginning June 1, 2018.  The Company has substantially completed its initial analysis identifying the areas that will be impacted by the new guidance and is currently analyzing the impact to its consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13 “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.”ASU No. 2016-13 requires an organizationto measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts.  ASU No. 2016-13 is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2019. This guidance is applicable to the Company's fiscal year beginning June 1, 2020. The Company is currently evaluating this guidance to determine the potential impact on its consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09 “Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU No. 2016-09 simplifies several aspects of the accounting for share-based payment award transactions, including income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows.  ASU No. 2016-09 is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2016, with early application permitted. This guidance is applicable to the Company's fiscal year beginning June 1, 2017. The Company does not anticipate this to be material to its consolidated financial statements, and anticipates adopting this standard for its fiscal year beginning June 1, 2016.

In February 2016, the FASB issued ASU No. 2016-02 “Leases (Topic 842).” ASU No. 2016-02 improves transparency and comparability among companies by recognizing lease assets and lease liabilities on the balance sheet and by disclosing key information about leasing arrangements. ASU No. 2016-02 is effective for public business entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2018, with early application permitted. This guidance is applicable to the Company's fiscal year beginning June 1, 2019. The Company is currently evaluating this guidance to determine the potential impact on its consolidated financial statements.

In January 2016, the FASB issued ASU No. 2016-01 “Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU No. 2016-01 provides updated guidance for the recognition, measurement, presentation, and disclosure of certain financial assets and liabilities. ASU No. 2016-01 is effective for public business entities for annual and interim periods beginning after December 15, 2017, with early application permitted. This guidance is applicable to the Company's fiscal year beginning June 1, 2018. The Company is currently evaluating this guidance to determine the potential impact on its consolidated financial statements.

Other recent authoritative guidance issued by the FASB (including technical corrections to the FASB Accounting Standards Codification), the American Institute of Certified Public Accountants, and the Securities and Exchange Commission (“SEC”) did not, or are not expected to have a material effect on the Company’s consolidated financial statements.

XML

Description of Business, Basis of Presentation, and Significant Accounting Policies (Tables)

12 Months Ended

May 31, 2016

Description of Business, Basis of Presentation, and Significant Accounting Policies [Abstract]

Estimated Useful Lives of Depreciable Assets

Category	Depreciable life
Buildings and improvements	Ten to 35 years or the remaining life, whichever is shorter
Data processing equipment	Three to four years
Furniture, fixtures, and equipment	Three to seven years
Leasehold improvements	Ten years or the life of the lease, whichever is shorter

XML

Basic and Diluted Earnings Per Share (Tables)

12 Months Ended

May 31, 2016

Basic and Diluted Earnings Per Share [Abstract]

Basic and Diluted Earnings Per Share

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Basic earnings per share:
Net income	$	756.8	$	674.9	$	627.5
Weighted-average common shares outstanding		360.7		362.9		364.5
Basic earnings per share	$	2.10	$	1.86	$	1.72
Diluted earnings per share:
Net income	$	756.8	$	674.9	$	627.5
Weighted-average common shares outstanding		360.7		362.9		364.5
Dilutive effect of common share equivalents		1.8		1.7		1.6
Weighted-average common shares outstanding, assuming dilution		362.5		364.6		366.1
Diluted earnings per share	$	2.09	$	1.85	$	1.71
Weighted-average anti-dilutive common share equivalents		0.5		0.3		0.7

XML

Investment Income, Net (Tables)

12 Months Ended

May 31, 2016

Investment Income, Net [Abstract]

Investment Income, Net

	Year ended May 31,
In millions	2016		2015		2014
Interest income on corporate funds	$	8.4	$	7.8	$	6.9
Interest expense		(1.1)		(0.7)		(1.1)
Net loss from equity-method investments		(2.8)		(0.7)		(0.4)
Investment income, net	$	4.5	$	6.4	$	5.4

XML

Stock-Based Compensation Plans (Tables)

12 Months Ended

May 31, 2016

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Weighted-Average Assumptions

	Year ended May 31,
	2014			2016			2015			2014
	Performance stock options			Stock options
Risk-free interest rate		1.5	%		1.9	%		2.1	%		2.0	%
Dividend yield		3.9	%		3.6	%		3.7	%		4.1	%
Volatility factor		0.20			0.18			0.21			0.22
Expected option life in years		4.5			6.1			6.0			6.4
Weighted-average grant-date   fair value of stock options granted (per share)	$	3.85		$	5.25		$	5.68		$	4.90

Stock Option Activity

				Weighted-
		Weighted-		average
	Shares	average		remaining	Aggregate
	subject	exercise price		contractual	intrinsic
In millions, except per share amounts	to options	per share		term (years)	value(1)
Outstanding as of May 31, 2015	4.7	$	35.21
Granted	0.8	$	47.42
Exercised	(0.9)	$	34.77
Forfeited	(0.1)	$	38.46
Expired	—	$	35.89
Outstanding as of May 31, 2016	4.5	$	37.42	6.3	$	75.9
Exercisable as of May 31, 2016	2.6	$	33.84	4.9	$	53.1

(1) Market price of the underlying stock as of May 31, 2016 less the exercise price.

Other Information Pertaining to Stock Option Grants

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Total intrinsic value of stock options exercised	$	14.5	$	17.6	$	18.9
Total grant-date fair value of stock options vested	$	4.0	$	3.6	$	3.0

RSU Activity

				Weighted-
		Weighted-		average
		average		remaining
		grant-date		vesting	Aggregate
		fair value		period	intrinsic
In millions, except per share amounts	RSUs	per share		(years)	value(1)
Nonvested as of May 31, 2015	1.8	$	33.57
Granted	0.7	$	42.60
Vested	(0.5)	$	31.34
Forfeited	(0.2)	$	35.97
Nonvested as of May 31, 2016	1.8	$	37.58	3.0	$	96.5

(1) Intrinsic value for RSUs is the market price of the underlying stock as of May 31, 2016.

Other Information Pertaining to RSUs

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Weighted-average grant-date fair value of RSUs granted	$	42.60	$	36.64	$	36.37
Total intrinsic value of RSUs vested	$	25.9	$	21.7	$	18.3
Total grant-date fair value of RSUs vested	$	17.3	$	14.8	$	12.1

Restricted Stock Activity

		Weighted-
		average
		grant-date
	Restricted	fair value
In millions, except per share amounts	shares	per share
Nonvested as of May 31, 2015	0.2	$	38.99
Granted	—	$	47.46
Vested	(0.1)	$	37.70
Forfeited	—	$	40.54
Nonvested as of May 31, 2016	0.1	$	43.99

Other Information Pertaining to Restricted Stock

	Year ended May 31,
In millions, except per share amounts	2016		2015		2014
Weighted-average grant-date fair value of restricted stock granted	$	47.46	$	41.70	$	38.53
Total grant-date fair value of restricted stock vested	$	3.0	$	3.5	$	3.3

Performance Share Activity

		Weighted-
		average
		grant-date
	Performance	fair value
In millions, except per share amounts	shares	per share
Nonvested as of May 31, 2015	0.6	$	34.24
Granted (1)	0.1	$	42.48
Vested	(0.2)	$	29.10
Forfeited	—	$	37.09
Nonvested as of May 31, 2016	0.5	$	38.89

(1) Performance shares granted assuming achievement of performance goals at target. Actual amount of shares to be earned may differ from this amount.

Performance Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock Option Activity

				Weighted-
		Weighted-		average
	Shares	average		remaining	Aggregate
	subject	exercise price		contractual	intrinsic
In millions, except per share amounts	to options	per share		term (years)	value(1)
Outstanding as of May 31, 2015	2.7	$	31.31
Granted	—	$	—
Exercised	(0.1)	$	31.11
Forfeited	(0.1)	$	29.85
Expired	—	$	—
Outstanding as of May 31, 2016	2.5	$	31.36	5.4	$	57.9
Exercisable as of May 31, 2016	0.4	$	31.22	5.2	$	9.6

(1) Market price of the underlying stock as of May 31, 2016 less the exercise price.

XML

Funds Held for Clients and Corporate Investments (Tables)

12 Months Ended

May 31, 2016

Funds Held for Clients and Corporate Investments [Abstract]

Funds Held for Clients and Corporate Investments

	May 31, 2016
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
In millions	cost		gains		losses		value
Type of issue:
Funds held for clients money market securities and other    cash equivalents	$	502.4	$	—	$	—	$	502.4
Available-for-sale securities:
Corporate bonds		128.4		2.9		(0.1)		131.2
General obligation municipal bonds		1,594.1		27.6		(0.1)		1,621.6
Pre-refunded municipal bonds(1)		60.2		1.4		—		61.6
Revenue municipal bonds		916.2		15.8		(0.2)		931.8
U.S. government agency securities		160.8		0.6		(0.3)		161.1
Variable rate demand notes		1,234.6		—		—		1,234.6
Total available-for-sale securities		4,094.3		48.3		(0.7)		4,141.9
Other		14.2		0.8		(0.1)		14.9
Total funds held for clients and corporate investments	$	4,610.9	$	49.1	$	(0.8)	$	4,659.2

	May 31, 2015
			Gross		Gross
	Amortized		unrealized		unrealized		Fair
In millions	cost		gains		losses		value
Type of issue:
Funds held for clients money market securities and other    cash equivalents	$	1,430.0	$	—	$	—	$	1,430.0
Available-for-sale securities:
General obligation municipal bonds		1,694.0		14.0		(4.3)		1,703.7
Pre-refunded municipal bonds(1)		101.7		1.0		—		102.7
Revenue municipal bonds		960.7		6.1		(3.2)		963.6
Variable rate demand notes		825.6		—		—		825.6
Total available-for-sale securities		3,582.0		21.1		(7.5)		3,595.6
Other		12.7		1.5		—		14.2
Total funds held for clients and corporate investments	$	5,024.7	$	22.6	$	(7.5)	$	5,039.8

(1) Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

Classification of Investments on Consolidated Balance Sheets

	May 31,
In millions	2016		2015
Funds held for clients	$	3,997.5	$	4,273.4
Corporate investments		220.6		366.6
Long-term corporate investments		441.1		399.8
Total funds held for clients and corporate investments	$	4,659.2	$	5,039.8

Securities in Unrealized Loss Position

	May 31, 2016
	Securities in an unrealized  loss position for less than  twelve months				Securities in an unrealized  loss position for more than  twelve months				Total
	Gross				Gross				Gross
	unrealized		Fair		unrealized		Fair		unrealized		Fair
In millions	losses		value		losses		value		losses		value
Type of issue:
Corporate bonds		(0.1)		14.7		—		—		(0.1)		14.7
General obligation municipal bonds	$	(0.1)	$	48.9	$	—	$	2.8	$	(0.1)	$	51.7
Pre-refunded municipal bonds		—		5.7		—		—		—		5.7
Revenue municipal bonds		—		20.7		(0.2)		11.7		(0.2)		32.4
U.S. government agency securities		(0.3)		51.1		—		—		(0.3)		51.1
Total	$	(0.5)	$	141.1	$	(0.2)	$	14.5	$	(0.7)	$	155.6

	May 31, 2015
	Securities in an unrealized  loss position for less than  twelve months				Securities in an unrealized  loss position for more than  twelve months				Total
	Gross				Gross				Gross
	unrealized		Fair		unrealized		Fair		unrealized		Fair
In millions	losses		value		losses		value		losses		value
Type of issue:
General obligation municipal bonds	$	(3.8)	$	535.1	$	(0.5)	$	26.3	$	(4.3)	$	561.4
Revenue municipal bonds		(3.2)		361.6		—		—		(3.2)		361.6
Total	$	(7.0)	$	896.7	$	(0.5)	$	26.3	$	(7.5)	$	923.0

Realized Gains and Losses from Sale of Available-for-sale Securities

	Year ended May 31,
In millions	2016		2015		2014
Gross realized gains	$	0.1	$	0.3	$	0.6
Gross realized losses		—		—		—
Net realized gains	$	0.1	$	0.3	$	0.6

Amortized Cost and Fair Value of Available-for-sale Securities by Contractual Maturity

	May 31, 2016
	Amortized		Fair
In millions	cost		value
Maturity date:
Due in one year or less	$	359.6	$	360.7
Due after one year through three years		742.7		749.4
Due after three years through five years		918.5		935.7
Due after five years		2,073.5		2,096.1
Total	$	4,094.3	$	4,141.9

XML

Fair Value Measurements (Tables)

12 Months Ended

May 31, 2016

Fair Value Measurements [Abstract]

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

	May 31, 2016
			Quoted		Significant
			prices in		other		Significant
	Carrying		active		observable		unobservable
	value		markets		inputs		inputs
In millions	(Fair value)		(Level 1)		(Level 2)		(Level 3)
Assets:
Available-for-sale securities:
Corporate bonds	$	131.2	$	—	$	131.2	$	—
General obligation municipal bonds		1,621.6		—		1,621.6		—
Pre-refunded municipal bonds		61.6		—		61.6		—
Revenue municipal bonds		931.8		—		931.8		—
U.S. government agency securities		161.1		—		161.1		—
Variable rate demand notes		1,234.6		—		1,234.6		—
Total available-for-sale securities	$	4,141.9	$	—	$	4,141.9	$	—
Other	$	14.9	$	14.9	$	—	$	—
Liabilities:
Other long-term liabilities	$	14.9	$	14.9	$	—	$	—

	May 31, 2015
			Quoted		Significant
			prices in		other		Significant
	Carrying		active		observable		unobservable
	value		markets		inputs		inputs
In millions	(Fair value)		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash equivalents:
Commercial paper	$	15.0	$	—	$	15.0	$	—
General obligation municipal bonds		55.1		—		55.1		—
Pre-refunded municipal bonds		20.5		—		20.5		—
Revenue municipal bonds		12.3		—		12.3		—
Money market securities		0.2		0.2		—		—
Total cash equivalents	$	103.1	$	0.2	$	102.9	$	—
Available-for-sale securities:
General obligation municipal bonds	$	1,703.7	$	—	$	1,703.7	$	—
Pre-refunded municipal bonds		102.7		—		102.7		—
Revenue municipal bonds		963.6		—		963.6		—
Variable rate demand notes		825.6		—		825.6		—
Total available-for-sale securities	$	3,595.6	$	—	$	3,595.6	$	—
Other	$	14.2	$	14.2	$	—	$	—
Liabilities:
Other long-term liabilities	$	14.2	$	14.2	$	—	$	—

XML

Property and Equipment, Net of Accumulated Depreciation (Tables)

12 Months Ended

May 31, 2016

Property and Equipment, Net of Accumulated Depreciation [Abstract]

Components of Property and Equipment, at Cost

	May 31,
In millions	2016		2015
Land and improvements	$	8.3	$	8.3
Buildings and improvements		103.0		102.1
Data processing equipment		196.1		190.9
Software		447.5		391.8
Furniture, fixtures, and equipment		125.0		145.6
Leasehold improvements		108.2		106.2
Construction in progress		24.1		28.5
Total property and equipment, gross		1,012.2		973.4
Less: Accumulated depreciation		659.2		619.5
Property and equipment, net of accumulated depreciation	$	353.0	$	353.9

XML

Goodwill and Intangible Assets, Net of Accumulated Amortization (Tables)

12 Months Ended

May 31, 2016

Goodwill and Intangible Assets, Net of Accumulated Amortization [Abstract]

Components of Intangible Assets, at Cost

	May 31,
In millions	2016		2015
Client lists	$	289.2	$	244.6
Other intangible assets		5.4		3.2
Total intangible assets, gross		294.6		247.8
Less: Accumulated amortization		225.1		215.4
Intangible assets, net of accumulated amortization	$	69.5	$	32.4

Estimated Amortization Expense

In millions	Estimated amortization
Year ending May 31,	expense
2017	$	17.7
2018		14.1
2019		11.1
2020		8.5
2021		6.5

XML

Income Taxes (Tables)

12 Months Ended

May 31, 2016

Income Taxes [Abstract]

Components of Deferred Tax Assets and Liabilities

	May 31,
In millions	2016		2015
Deferred tax assets:
Compensation and employee benefit liabilities	$	21.4	$	20.9
Other current liabilities		7.9		6.9
Tax credit carry forward		40.0		40.1
Depreciation		8.8		11.9
Stock-based compensation		22.0		21.6
Tax benefit of uncertain tax positions		18.6		15.7
Other		7.1		9.2
Gross deferred tax assets		125.8		126.3
Deferred tax liabilities:
Capitalized software		56.3		53.6
Depreciation		2.5		3.8
Goodwill and intangible assets		58.5		52.0
Revenue not subject to current taxes		13.3		13.1
Unrealized gains on available-for-sale securities		17.3		5.3
Other		—		0.3
Gross deferred tax liabilities		147.9		128.1
Net deferred tax liability	$	(22.1)	$	(1.8)

Components of Provision for Income Taxes

	Year ended May 31,
In millions	2016		2015		2014
Current:
Federal	$	336.4	$	341.4	$	314.5
State		50.8		47.8		51.0
Total current		387.2		389.2		365.5
Deferred:
Federal		5.5		(5.1)		(3.5)
State		1.6		1.0		(1.4)
Total deferred		7.1		(4.1)		(4.9)
Income taxes	$	394.3	$	385.1	$	360.6

Reconciliation of U.S. Federal Statutory Tax Rate

	Year ended May 31,
	2016		2015		2014
Federal statutory tax rate	35.0	%	35.0	%	35.0	%
Increase/(decrease) resulting from:
State income taxes, net of federal tax benefit	3.0	%	3.0	%	3.3	%
Section 199 - Qualified production activities	(2.4)	%	—	%	—	%
Tax-exempt municipal bond interest	(1.4)	%	(1.5)	%	(1.5)	%
Other items	0.1	%	(0.2)	%	(0.3)	%
Effective income tax rate	34.3	%	36.3	%	36.5	%

Reconciliation of Gross Unrecognized Tax Benefits, Not Including Interest or Other Potential Offsetting Effects

	Year ended May 31,
In millions	2016		2015		2014
Balance as of beginning of fiscal year	$	39.9	$	40.0	$	26.7
Additions for tax positions of the current year		7.3		6.7		11.2
Additions for tax positions of prior years		20.7		0.8		4.2
Reductions for tax positions of prior years		(0.1)		(0.4)		(1.8)
Settlements with tax authorities		(2.2)		(1.2)		—
Expiration of the statute of limitations		(0.9)		(6.0)		(0.3)
Balance as of end of fiscal year	$	64.7	$	39.9	$	40.0

XML

Accumulated Other Comprehensive Income (Tables)

12 Months Ended

May 31, 2016

Accumulated Other Comprehensive Income [Abstract]

Changes in Accumulated Other Comprehensive Income

	Year ended May 31,
In millions	2016		2015		2014
Beginning balance	$	7.5	$	21.5	$	22.0
Other comprehensive income/(loss):
Unrealized holding gains/(losses)		34.2		(21.5)		0.3
Income tax (expense)/benefit related to unrealized holding gains/(losses)		(12.4)		7.7		(0.4)
Reclassification adjustment for the net gain on sale of available-for-sale    securities realized in net income		(0.1)		(0.3)		(0.6)
Income tax expense on reclassification adjustment for the net gain on    sale of available-for-sale securities		—		0.1		0.2
Total other comprehensive income/(loss), net of tax		21.7		(14.0)		(0.5)
Ending balance	$	29.2	$	7.5	$	21.5
Total tax expense/(benefit) included in other comprehensive income/(loss)	$	12.4	$	(7.8)	$	0.2

XML

Commitments and Contingencies (Tables)

12 Months Ended

May 31, 2016

Other Commitments [Line Items]

Future Minimum Operating Lease Payments

		Minimum
In millions		lease
Year ending May 31,		payments
2017	$	35.7
2018		28.5
2019		20.0
2020		12.9
2021		7.4
Thereafter		2.2

Minimum Future Payment Obligations

	Minimum
In millions	payment
Year ending May 31,	obligation
2017	$	73.5
2018		20.5
2019		7.6
2020		4.4
2021		3.0
Thereafter		0.6

Line of Credit [Member]

Other Commitments [Line Items]

Lines of Credit Facility Amount Available or Amount Borrowed

Financial institution	Amount available	Expiration date
JP Morgan Chase Bank, N.A.	$350 million	February 27, 2017
Bank of America, N.A.	$250 million	February 28, 2017
PNC Bank, National Association	$150 million	February 27, 2017
Wells Fargo Bank, National Association	$150 million	February 27, 2017

Revolving Credit Facility [Member]

Other Commitments [Line Items]

Lines of Credit Facility Amount Available or Amount Borrowed

$ in millions	2016				2015
Number of days borrowed		5			2
Maximum amount borrowed	$	450.0		$	150.0
Average amount borrowed	$	305.0		$	125.0
Weighted-average interest rate		3.39	%		3.25	%

XML

Quarterly Financial Data (Tables)

12 Months Ended

May 31, 2016

Quarterly Financial Data [Abstract]

Quarterly Financial Data

	Three Months Ended
Fiscal 2016	August 31		November 30		February 29		May 31		Full Year
Service revenue	$	712.2	$	711.3	$	740.7	$	741.6	$	2,905.8
Interest on funds held for clients		10.8		11.1		11.9		12.3		46.1
Total revenue	$	723.0	$	722.4	$	752.6	$	753.9	$	2,951.9
Operating income	$	296.1	$	294.2	$	280.0	$	276.3	$	1,146.6
Investment income/(loss), net		1.4		1.6		1.7		(0.2)		4.5
Income before income taxes		297.5		295.8		281.7		276.1		1,151.1
Income taxes		88.4		106.6		101.3		98.0		394.3
Net income	$	209.1	$	189.2	$	180.4	$	178.1	$	756.8
Basic earnings per share(1)	$	0.58	$	0.52	$	0.50	$	0.49	$	2.10
Diluted earnings per share(1)	$	0.58	$	0.52	$	0.50	$	0.49	$	2.09
Weighted-average common shares    outstanding		361.1		360.7		360.5		360.3		360.7
Weighted-average common shares    outstanding, assuming dilution		362.8		362.3		362.2		360.7		362.5
Cash dividends per common share	$	0.42	$	0.42	$	0.42	$	0.42	$	1.68
Total net realized gains(2)	$	—	$	—	$	0.1	$	—	$	0.1

	Three Months Ended
Fiscal 2015	August 31		November 30		February 28		May 31		Full Year
Service revenue	$	656.6	$	665.9	$	693.6	$	681.4	$	2,697.5
Interest on funds held for clients		10.2		10.4		10.7		10.8		42.1
Total revenue	$	666.8	$	676.3	$	704.3	$	692.2	$	2,739.6
Operating income	$	267.5	$	270.2	$	264.3	$	251.6	$	1,053.6
Investment income, net		1.4		1.4		1.6		2.0		6.4
Income before income taxes		268.9		271.6		265.9		253.6		1,060.0
Income taxes		97.6		98.6		96.5		92.4		385.1
Net income	$	171.3	$	173.0	$	169.4	$	161.2	$	674.9
Basic earnings per share(1)	$	0.47	$	0.48	$	0.47	$	0.44	$	1.86
Diluted earnings per share(1)	$	0.47	$	0.47	$	0.46	$	0.44	$	1.85
Weighted-average common shares    outstanding		363.1		363.0		363.2		362.3		362.9
Weighted-average common shares    outstanding, assuming dilution		364.7		364.6		365.0		364.5		364.6
Cash dividends per common share	$	0.38	$	0.38	$	0.38	$	0.38	$	1.52
Total net realized gains(2)	$	0.1	$	0.1	$	—	$	0.1	$	0.3

(1) Each quarter is a discrete period and the sum of the four quarters’ basic and diluted earnings per share amounts may not equal the full year amount.

(2) Total net realized gains on the combined funds held for clients and corporate investment portfolios.

XML

Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	May 31, 2016 USD ($) segment $ / shares	May 31, 2015 USD ($)	May 31, 2014 USD ($)	Jul. 07, 2016 $ / shares
Accounting Policies [Line Items]
Number of reportable segments | segment	1
Maximum period in which payroll taxes will be remitted after receipt of collections from clients	90 days
Declared date	Jul. 07, 2016
Quarterly dividend per share | $ / shares	$ 0.42
Payable date	Aug. 25, 2016
Record date	Aug. 01, 2016
Allowance for doubtful accounts	$ 4.2	$ 1.4
Accounts receivable, net of allowance for doubtful accounts	408.6	176.6
Goodwill	657.1	561.5
Goodwill impairment loss	0.0	0.0	$ 0.0
Direct pass-through costs	5,100.0	4,200.0	$ 3,400.0
Maximum individual workers' compensation claims liability	1.3	1.0
Workers' compensation insurance costs in current liabilities	13.8	11.3
Workers' compensation insurance costs in long-term liabilities	18.4	15.3
Maximum individual health insurance claims liability	0.3	0.3
PEO accrued health insurance reserves in current liabilities	9.5	8.1
Reserve for uncertain tax positions	$ 54.2	29.1
Software Development [Member]
Accounting Policies [Line Items]
Estimated useful lives	15 years
Minimum [Member]
Accounting Policies [Line Items]
Period in which payroll taxes are typically remitted after receipt of collections from clients	1 day
Payroll funding fees average collection period	45 days
Amortization period	3 years
Minimum [Member] | Software [Member]
Accounting Policies [Line Items]
Estimated useful lives	3 years
Maximum [Member]
Accounting Policies [Line Items]
Period in which payroll taxes are typically remitted after receipt of collections from clients	30 days
Payroll funding fees average collection period	60 days
Amortization period	12 years
Maximum [Member] | Software [Member]
Accounting Policies [Line Items]
Estimated useful lives	5 years
Trade Receivables [Member]
Accounting Policies [Line Items]
Accounts receivable, net of allowance for doubtful accounts	$ 221.6	$ 176.6
Purchased Receivables [Member]
Accounting Policies [Line Items]
Accounts receivable, net of allowance for doubtful accounts	$ 187.0
Germany [Member] | Total Revenue [Member] | Geographic Concentration Risk [Member]
Accounting Policies [Line Items]
Percentage of total revenue less than one percent	1.00%	1.00%	1.00%
Subsequent Event [Member]
Accounting Policies [Line Items]
Quarterly dividend per share increase | $ / shares				$ 0.04
Quarterly dividend percentage increase				10.00%
Quarterly dividend per share | $ / shares				$ 0.46

XML

Description of Business, Basis of Presentation, and Significant Accounting Policies (Estimated Useful Lives of Depreciable Assets) (Details)	12 Months Ended
	May 31, 2016
Minimum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Minimum [Member] | Data Processing Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Minimum [Member] | Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Maximum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	35 years
Maximum [Member] | Data Processing Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	4 years
Maximum [Member] | Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	7 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years

XML

Basic and Diluted Earnings Per Share (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014	Jul. 31, 2016
Approved repurchase amount			$ 350.0
Common stock repurchased and retired	$ 107.9	$ 182.4	$ 249.7
Common Stock [Member]
Common shares repurchased and retired	2.2	3.9	6.2
Common stock repurchased and retired			$ 0.1
Subsequent Event [Member]
Approved repurchase amount				$ 350.0

XML

Basic and Diluted Earnings Per Share (Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended																12 Months Ended
	May 31, 2016		Feb. 29, 2016		Nov. 30, 2015		Aug. 31, 2015		May 31, 2015		Feb. 28, 2015		Nov. 30, 2014		Aug. 31, 2014		May 31, 2016		May 31, 2015		May 31, 2014
Basic and Diluted Earnings Per Share [Abstract]
Net income	$ 178.1		$ 180.4		$ 189.2		$ 209.1		$ 161.2		$ 169.4		$ 173.0		$ 171.3		$ 756.8		$ 674.9		$ 627.5
Weighted-average common shares outstanding	360.3		360.5		360.7		361.1		362.3		363.2		363.0		363.1		360.7		362.9		364.5
Basic earnings per share	$ 0.49	[1]	$ 0.50	[1]	$ 0.52	[1]	$ 0.58	[1]	$ 0.44	[1]	$ 0.47	[1]	$ 0.48	[1]	$ 0.47	[1]	$ 2.10	[1]	$ 1.86	[1]	$ 1.72
Dilutive effect of common share equivalents																	1.8		1.7		1.6
Weighted-average common shares outstanding, assuming dilution	360.7		362.2		362.3		362.8		364.5		365.0		364.6		364.7		362.5		364.6		366.1
Diluted earnings per share	$ 0.49	[1]	$ 0.50	[1]	$ 0.52	[1]	$ 0.58	[1]	$ 0.44	[1]	$ 0.46	[1]	$ 0.47	[1]	$ 0.47	[1]	$ 2.09	[1]	$ 1.85	[1]	$ 1.71
Weighted-average anti-dilutive common share equivalents																	0.5		0.3		0.7

[1] Each quarter is a discrete period and the sum of the four quarters' basic and diluted earnings per share amounts may not equal the full year amount.

XML

Business Combination (Details) - Advance Partners [Member] $ in Millions	12 Months Ended
	May 31, 2016 USD ($)
Business Acquisition [Line Items]
Effective acquisition date	Dec. 22, 2015
Base purchase price	$ 190.5
Settlement of debt	118.4
Cash acquired	12.8
Accounts receivable balances acquired, net	164.8
Goodwill acquired	$ 95.6

XML

Investment Income, Net (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May 31, 2016	May 31, 2015	May 31, 2014
Investment Income, Net [Abstract]
Interest income on corporate funds									$ 8.4	$ 7.8	$ 6.9
Interest expense									(1.1)	(0.7)	(1.1)
Net loss from equity-method investments									(2.8)	(0.7)	(0.4)
Investment income, net	$ (0.2)	$ 1.7	$ 1.6	$ 1.4	$ 2.0	$ 1.6	$ 1.4	$ 1.4	$ 4.5	$ 6.4	$ 5.4

XML

Stock-Based Compensation Plans (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant	44.1
Shares available for future grants	22.2
Stock-based compensation expense	$ 34.6	$ 31.4	$ 26.3
Income tax benefits related to stock-based compensation	12.9	11.7	10.1
Total unrecognized compensation cost related to all unvested stock-based awards	$ 60.8
Weighted-average period in years of all unvested stock-based awards	2 years 10 months 24 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	0.8
Contractual life	10 years
Total intrinsic value of stock options exercised	$ 14.5	17.6	18.9
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted
Total intrinsic value of stock options exercised	$ 1.0
Service period	2 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period	1 year
Director [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Director [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Management [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Total Award [Member] | Officer [Member] | Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	63.00%
Tranche One [Member] | Officer [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Tranche One [Member] | Officer [Member] | Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	23.50%
Tranche One [Member] | Officer [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.30%
Tranche One [Member] | Management [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	20.00%
Tranche Two [Member] | Officer [Member] | Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	39.50%
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0.0	$ 0.0	$ 0.0
Discount to the market price	5.00%
Maximum [Member] | Tranche One [Member] | Officer [Member] | Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%
Maximum [Member] | Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount to the market price	15.00%

XML

Stock-Based Compensation Plans (Weighted-Average Assumptions) (Details) - $ / shares	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			1.50%
Dividend yield			3.90%
Volatility factor			0.20%
Expected option life in years			4 years 6 months
Weighted-average grant-date fair value of stock options granted (per share)			$ 3.85
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.90%	2.10%	2.00%
Dividend yield	3.60%	3.70%	4.10%
Volatility factor	0.18%	0.21%	0.22%
Expected option life in years	6 years 1 month 6 days	6 years	6 years 4 months 24 days
Weighted-average grant-date fair value of stock options granted (per share)	$ 5.25	$ 5.68	$ 4.90

XML

Stock-Based Compensation Plans (Stock Option Activity) (Details) - Stock Options [Member] $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	May 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Beginning balance, Shares subject to options | shares	4.7
Granted, Shares subject to options | shares	0.8
Exercised, Shares subject to options | shares	(0.9)
Forfeited, Shares subject to options | shares	(0.1)
Expired, Shares subject to options | shares
Outstanding, Ending balance, Shares subject to options | shares	4.5
Exercisable, Shares subject to options | shares	2.6
Outstanding, Beginning balance, Weighted-average exercise price per share | $ / shares	$ 35.21
Granted, Weighted-average exercise price per share | $ / shares	47.42
Exercised, Weighted-average exercise price per share | $ / shares	34.77
Forfeited, Weighted-average exercise price per share | $ / shares	38.46
Expired, Weighted-average exercise price per share | $ / shares	35.89
Outstanding, Ending balance, Weighted-average exercise price per share | $ / shares	37.42
Exercisable, Weighted-average exercise price per share | $ / shares	$ 33.84
Outstanding, Weighted-average remaining contractual term (years)	6 years 3 months 18 days
Exercisable, Weighted-average remaining contractual term (years)	4 years 10 months 24 days
Outstanding, Aggregate intrinsic value | $	$ 75.9	[1]
Exercisable, Aggregate intrinsic value | $	$ 53.1	[1]

[1] Market price of the underlying stock as of May 31, 2016 less the exercise price.

XML

Stock-Based Compensation Plans (Other Information Pertaining to Stock Option Grants) (Details) - Stock Options [Member] - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of stock options exercised	$ 14.5	$ 17.6	$ 18.9
Total grant-date fair value of stock options vested	$ 4.0	$ 3.6	$ 3.0

XML

Stock-Based Compensation Plans (Performance Stock Option Activity) (Details) - Performance Awards [Member] $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	May 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Beginning balance, Shares subject to options | shares	2.7
Granted, Shares subject to options | shares
Exercised, Shares subject to options | shares	(0.1)
Forfeited, Shares subject to options | shares	(0.1)
Expired, Shares subject to options | shares
Outstanding, Ending balance, Shares subject to options | shares	2.5
Exercisable, Shares subject to options | shares	0.4
Outstanding, Beginning balance, Weighted-average exercise price per share | $ / shares	$ 31.31
Granted, Weighted-average exercise price per share | $ / shares
Exercised, Weighted-average exercise price per share | $ / shares	31.11
Forfeited, Weighted-average exercise price per share | $ / shares	29.85
Expired, Weighted-average exercise price per share | $ / shares
Outstanding, Ending balance, Weighted-average exercise price per share | $ / shares	31.36
Exercisable, Weighted-average exercise price per share | $ / shares	$ 31.22
Outstanding, Weighted-average remaining contractual term (years)	5 years 4 months 24 days
Exercisable, Weighted-average remaining contractual term (years)	5 years 2 months 12 days
Outstanding, Aggregate intrinsic value | $	$ 57.9	[1]
Exercisable, Aggregate intrinsic value | $	$ 9.6	[1]

[1] Market price of the underlying stock as of May 31, 2016 less the exercise price.

XML

Stock-Based Compensation Plans (RSU Activity) (Details) - Restricted Stock Units [Member] - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		May 31, 2016	May 31, 2015	May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested, Beginning balance, Awards		1.8
Granted, Awards		0.7
Vested, Awards		(0.5)
Forfeited, Awards		(0.2)
Nonvested, Ending balance, Awards		1.8	1.8
Nonvested, Beginning balance, Weighted-average grant-date fair value per share		$ 33.57
Granted, Weighted-average grant-date fair value per share		42.60	$ 36.64	$ 36.37
Vested, Weighted-average grant-date fair value per share		31.34
Forfeited, Weighted-average grant-date fair value per share		35.97
Nonvested, Ending balance, Weighted-average grant-date fair value per share		$ 37.58	$ 33.57
Nonvested, Weighted-average remaining vesting period (years)		3 years
Nonvested, Aggregate intrinsic value	[1]	$ 96.5

[1] Intrinsic value for RSUs is the market price of the underlying stock as of May 31, 2016.

XML

Stock-Based Compensation Plans (Other Information Pertaining to RSUs) (Details) - Restricted Stock Units [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of restricted awards granted	$ 42.60	$ 36.64	$ 36.37
Total intrinsic value of RSUs vested	$ 25.9	$ 21.7	$ 18.3
Total grant-date fair value of RSUs vested	$ 17.3	$ 14.8	$ 12.1

XML

Stock-Based Compensation Plans (Restricted Stock Activity) (Details) - Restricted Stock [Member] - $ / shares shares in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested, Beginning balance, Awards	0.2
Granted, Awards
Vested, Awards	(0.1)
Forfeited, Awards
Nonvested, Ending balance, Awards	0.1	0.2
Nonvested, Beginning balance, Weighted-average grant-date fair value per share	$ 38.99
Granted, Weighted-average grant-date fair value per share	47.46	$ 41.70	$ 38.53
Vested, Weighted-average grant-date fair value per share	37.70
Forfeited, Weighted-average grant-date fair value per share	40.54
Nonvested, Ending balance, Weighted-average grant-date fair value per share	$ 43.99	$ 38.99

XML

Stock-Based Compensation Plans (Other Information Pertaining to Restricted Stock) (Details) - Restricted Stock [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of restricted awards granted	$ 47.46	$ 41.70	$ 38.53
Total grant-date fair value of restricted stock vested	$ 3.0	$ 3.5	$ 3.3

XML

Stock-Based Compensation Plans (Performance Share Activity) (Details) - Performance Awards [Member] shares in Millions	12 Months Ended
	May 31, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested, Beginning balance, Awards | shares	0.6
Granted, Awards | shares	0.1	[1]
Vested, Awards | shares	(0.2)
Forfeited, Awards | shares
Nonvested, Ending balance, Awards | shares	0.5
Nonvested, Beginning balance, Weighted-average grant-date fair value per share | $ / shares	$ 34.24
Granted, Weighted-average grant-date fair value per share | $ / shares	42.48	[1]
Vested, Weighted-average grant-date fair value per share | $ / shares	29.10
Forfeited, Weighted-average grant-date fair value per share | $ / shares	37.09
Nonvested, Ending balance, Weighted-average grant-date fair value per share | $ / shares	$ 38.89

[1] Performance shares granted assuming achievement of performance goals at target. Actual amount of shares to be earned may differ from this amount.

XML

Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions	12 Months Ended
	May 31, 2016 USD ($) security	May 31, 2015 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Net unrealized gain on available-for-sale securities	$ 47.6	$ 13.6
Number of available-for-sale securities in an unrealized loss position | security	63	280
Gross unrealized losses on available-for-sale securities	$ 0.7	$ 7.5
Variable Rate Demand Notes [Member] | Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities contractual maturities	20 years
Variable Rate Demand Notes [Member] | Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities contractual maturities	30 years

XML

Funds Held for Clients and Corporate Investments (Funds Held for Clients and Corporate Investments) (Details) - USD ($) $ in Millions		May 31, 2016	May 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Funds held for clients money market securities and other cash equivalents, Amortized cost		$ 502.4	$ 1,430.0
Funds held for clients money market securities and other cash equivalents, Gross unrealized gains
Funds held for clients money market securities and other cash equivalents, Gross unrealized losses
Funds held for clients money market securities and other cash equivalents, Fair value		502.4	1,430.0
Available-for-sale securities, Amortized cost		4,094.3	3,582.0
Available-for-sale securities, Gross unrealized gains		48.3	21.1
Available-for-sale securities, Gross unrealized losses		(0.7)	(7.5)
Available-for-sale securities, Fair value		4,141.9	3,595.6
Other, Amortized cost		14.2	12.7
Other, Gross unrealized gains		0.8	1.5
Other, Gross unrealized losses		(0.1)
Other, Fair value		14.9	14.2
Total funds held for clients and corporate investments, Amortized cost		4,610.9	5,024.7
Total funds held for clients and corporate investments, Gross unrealized gains		49.1	22.6
Total funds held for clients and corporate investments, Gross unrealized losses		(0.8)	(7.5)
Total funds held for clients and corporate investments, Fair value		4,659.2	5,039.8
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized cost		128.4
Available-for-sale securities, Gross unrealized gains		2.9
Available-for-sale securities, Gross unrealized losses		(0.1)
Available-for-sale securities, Fair value		131.2
General Obligation Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized cost		1,594.1	1,694.0
Available-for-sale securities, Gross unrealized gains		27.6	14.0
Available-for-sale securities, Gross unrealized losses		(0.1)	(4.3)
Available-for-sale securities, Fair value		1,621.6	1,703.7
Pre-Refunded Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized cost	[1]	60.2	101.7
Available-for-sale securities, Gross unrealized gains	[1]	1.4	1.0
Available-for-sale securities, Gross unrealized losses	[1]
Available-for-sale securities, Fair value	[1]	61.6	102.7
Revenue Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized cost		916.2	960.7
Available-for-sale securities, Gross unrealized gains		15.8	6.1
Available-for-sale securities, Gross unrealized losses		(0.2)	(3.2)
Available-for-sale securities, Fair value		931.8	963.6
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized cost		160.8
Available-for-sale securities, Gross unrealized gains		0.6
Available-for-sale securities, Gross unrealized losses		(0.3)
Available-for-sale securities, Fair value		161.1
Variable Rate Demand Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized cost		1,234.6	825.6
Available-for-sale securities, Gross unrealized gains
Available-for-sale securities, Gross unrealized losses
Available-for-sale securities, Fair value		$ 1,234.6	$ 825.6

[1] Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

XML

Funds Held for Clients and Corporate Investments (Classification of Investments on Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	May 31, 2016	May 31, 2015
Funds Held for Clients and Corporate Investments [Abstract]
Funds held for clients	$ 3,997.5	$ 4,273.4
Corporate investments	220.6	366.6
Long-term corporate investments	441.1	399.8
Total funds held for clients and corporate investments, Fair value	$ 4,659.2	$ 5,039.8

XML

Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions	May 31, 2016	May 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses	$ (0.5)	$ (7.0)
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses	(0.2)	(0.5)
Total, Gross unrealized losses	(0.7)	(7.5)
Securities in an unrealized loss position for less than twelve months, Fair value	141.1	896.7
Securities in an unrealized loss position for more than twelve months, Fair value	14.5	26.3
Total, Fair value	155.6	923.0
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses	(0.1)
Total, Gross unrealized losses	(0.1)
Securities in an unrealized loss position for less than twelve months, Fair value	14.7
Total, Fair value	14.7
General Obligation Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses	(0.1)	(3.8)
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses		(0.5)
Total, Gross unrealized losses	(0.1)	(4.3)
Securities in an unrealized loss position for less than twelve months, Fair value	48.9	535.1
Securities in an unrealized loss position for more than twelve months, Fair value	2.8	26.3
Total, Fair value	51.7	561.4
Pre-Refunded Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in an unrealized loss position for less than twelve months, Fair value	5.7
Total, Fair value	5.7
Revenue Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses		(3.2)
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses	(0.2)
Total, Gross unrealized losses	(0.2)	(3.2)
Securities in an unrealized loss position for less than twelve months, Fair value	20.7	361.6
Securities in an unrealized loss position for more than twelve months, Fair value	11.7
Total, Fair value	32.4	$ 361.6
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses	(0.3)
Total, Gross unrealized losses	(0.3)
Securities in an unrealized loss position for less than twelve months, Fair value	51.1
Total, Fair value	$ 51.1

XML

Funds Held for Clients and Corporate Investments (Realized Gains and Losses from Sale of Available-for-sale Securities) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Feb. 29, 2016	[1]	May 31, 2015	[1]	Nov. 30, 2014	[1]	Aug. 31, 2014	[1]	May 31, 2016		May 31, 2015		May 31, 2014
Funds Held for Clients and Corporate Investments [Abstract]
Gross realized gains									$ 0.1		$ 0.3		$ 0.6
Gross realized losses
Net realized gains	$ 0.1		$ 0.1		$ 0.1		$ 0.1		$ 0.1	[1]	$ 0.3	[1]	$ 0.6

[1] Total net realized gains on the combined funds held for clients and corporate investment portfolios.

XML

Funds Held for Clients and Corporate Investments (Amortized Cost and Fair Value of Available-for-sale Securities by Contractual Maturity) (Details) - USD ($) $ in Millions	May 31, 2016	May 31, 2015
Funds Held for Clients and Corporate Investments [Abstract]
Due in one year or less, Amortized cost	$ 359.6
Due after one year through three years, Amortized cost	742.7
Due after three years through five years, Amortized cost	918.5
Due after five years, Amortized cost	2,073.5
Available-for-sale securities, Amortized cost	4,094.3	$ 3,582.0
Due in one year or less, Fair value	360.7
Due after one year through three years, Fair value	749.4
Due after three years through five years, Fair value	935.7
Due after five years, Fair value	2,096.1
Available-for-sale securities, Fair value	$ 4,141.9	$ 3,595.6

XML

Fair Value Measurements (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		$ 103.1
Available-for-sale securities	$ 4,141.9	3,595.6
Other	14.9	14.2
Other long-term liabilities	14.9	14.2
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		15.0
Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	131.2
General Obligation Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		55.1
Available-for-sale securities	1,621.6	1,703.7
Pre-Refunded Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		20.5
Available-for-sale securities	61.6	102.7
Revenue Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		12.3
Available-for-sale securities	931.8	963.6
U.S. Government Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	161.1
Variable Rate Demand Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,234.6	825.6
Money Market Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0.2
Quoted Prices in Active Markets (Level 1) [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0.2
Other	14.9	14.2
Other long-term liabilities	14.9	14.2
Quoted Prices in Active Markets (Level 1) [Member] | Money Market Securities [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0.2
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		102.9
Available-for-sale securities	4,141.9	3,595.6
Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		15.0
Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	131.2
Significant Other Observable Inputs (Level 2) [Member] | General Obligation Municipal Bonds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		55.1
Available-for-sale securities	1,621.6	1,703.7
Significant Other Observable Inputs (Level 2) [Member] | Pre-Refunded Municipal Bonds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		20.5
Available-for-sale securities	61.6	102.7
Significant Other Observable Inputs (Level 2) [Member] | Revenue Municipal Bonds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		12.3
Available-for-sale securities	931.8	963.6
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Agency Securities [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	161.1
Significant Other Observable Inputs (Level 2) [Member] | Variable Rate Demand Notes [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,234.6	825.6
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Available-for-sale securities
Other
Other long-term liabilities
Significant Unobservable Inputs (Level 3) [Member] | Commercial Paper [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Significant Unobservable Inputs (Level 3) [Member] | Corporate Bonds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities
Significant Unobservable Inputs (Level 3) [Member] | General Obligation Municipal Bonds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Available-for-sale securities
Significant Unobservable Inputs (Level 3) [Member] | Pre-Refunded Municipal Bonds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Available-for-sale securities
Significant Unobservable Inputs (Level 3) [Member] | Revenue Municipal Bonds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Available-for-sale securities
Significant Unobservable Inputs (Level 3) [Member] | U.S. Government Agency Securities [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities
Significant Unobservable Inputs (Level 3) [Member] | Variable Rate Demand Notes [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities
Significant Unobservable Inputs (Level 3) [Member] | Money Market Securities [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Maximum [Member] | Significant Other Observable Inputs (Level 2) [Member] | Available-For-Sale Securities [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities maturity	90 days

XML

Property and Equipment, Net of Accumulated Depreciation (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 1,012.2	$ 973.4
Less: Accumulated depreciation	659.2	619.5
Property and equipment, net of accumulated depreciation	353.0	353.9
Depreciation expense	99.2	92.1	$ 89.1
Land and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	8.3	8.3
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	103.0	102.1
Data Processing Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	196.1	190.9
Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	447.5	391.8
Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	125.0	145.6
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	108.2	106.2
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 24.1	$ 28.5

XML

Goodwill and Intangible Assets, Net of Accumulated Amortization (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 657.1	$ 561.5
Acquired intangible assets with weighted-average amortization periods	9 years 6 months
Amortization expense	$ 15.9	$ 14.5	$ 15.9
Client Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets with weighted-average amortization periods	9 years 8 months 12 days
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets with weighted-average amortization periods	5 years
Advance Partners [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired	$ 95.6

XML

Goodwill and Intangible Assets, Net of Accumulated Amortization (Components of Intangible Assets, at Cost) (Details) - USD ($) $ in Millions	May 31, 2016	May 31, 2015
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, gross	$ 294.6	$ 247.8
Less: Accumulated amortization	225.1	215.4
Intangible assets, net of accumulated amortization	69.5	32.4
Client Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, gross	289.2	244.6
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, gross	$ 5.4	$ 3.2

XML

Goodwill and Intangible Assets, Net of Accumulated Amortization (Estimated Amortization Expense) (Details) $ in Millions	May 31, 2016 USD ($)
Goodwill and Intangible Assets, Net of Accumulated Amortization [Abstract]
Year ending May 31, 2017	$ 17.7
Year ending May 31, 2018	14.1
Year ending May 31, 2019	11.1
Year ending May 31, 2020	8.5
Year ending May 31, 2021	$ 6.5

XML

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015
Income Tax Contingency [Line Items]
Reserve for uncertain tax positions	$ 54.2	$ 29.1
Impact of uncertain tax positions, if recognized, on effective income tax rate	$ 54.2	$ 29.1
Federal [Member] | IRS [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Fiscal year currently under audit	2012
Fiscal years subject to potential audit	2015
Federal [Member] | IRS [Member] | Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Fiscal year currently under audit	2014
Fiscal years subject to potential audit	2016

XML

Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	May 31, 2016	May 31, 2015
Income Taxes [Abstract]
Compensation and employee benefit liabilities	$ 21.4	$ 20.9
Other current liabilities	7.9	6.9
Tax credit carry forward	40.0	40.1
Depreciation	8.8	11.9
Stock-based compensation	22.0	21.6
Tax benefit of uncertain tax positions	18.6	15.7
Other	7.1	9.2
Gross deferred tax assets	125.8	126.3
Capitalized software	56.3	53.6
Depreciation	2.5	3.8
Goodwill and intangible assets	58.5	52.0
Revenue not subject to current taxes	13.3	13.1
Unrealized gains on available-for-sale securities	17.3	5.3
Other		0.3
Gross deferred tax liabilities	147.9	128.1
Net deferred tax liability	$ (22.1)	$ (1.8)

XML

Income Taxes (Components of Provision for Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May 31, 2016	May 31, 2015	May 31, 2014
Income Taxes [Abstract]
Federal									$ 336.4	$ 341.4	$ 314.5
State									50.8	47.8	51.0
Total current									387.2	389.2	365.5
Federal									5.5	(5.1)	(3.5)
State									1.6	1.0	(1.4)
Total deferred									7.1	(4.1)	(4.9)
Income taxes	$ 98.0	$ 101.3	$ 106.6	$ 88.4	$ 92.4	$ 96.5	$ 98.6	$ 97.6	$ 394.3	$ 385.1	$ 360.6

XML

Income Taxes (Reconciliation of U.S. Federal Statutory Tax Rate) (Details)	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Income Taxes [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	3.00%	3.00%	3.30%
Section 199 - Qualified production activities	(2.40%)
Tax-exempt municipal bond interest	(1.40%)	(1.50%)	(1.50%)
Other items	0.10%	(0.20%)	(0.30%)
Effective income tax rate	34.30%	36.30%	36.50%

XML

Income Taxes (Reconciliation of Gross Unrecognized Tax Benefits, Not Including Interest or Other Potential Offsetting Effects) (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Income Taxes [Abstract]
Balance as of beginning of fiscal year	$ 39.9	$ 40.0	$ 26.7
Additions for tax positions of the current year	7.3	6.7	11.2
Additions for tax positions of prior years	20.7	0.8	4.2
Reductions for tax positions of prior years	(0.1)	(0.4)	(1.8)
Settlements with tax authorities	(2.2)	(1.2)
Expiration of the statute of limitations	(0.9)	(6.0)	(0.3)
Balance as of end of fiscal year	$ 64.7	$ 39.9	$ 40.0

XML

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Accumulated Other Comprehensive Income [Abstract]
Beginning balance	$ 7.5	$ 21.5	$ 22.0
Unrealized holding gains/(losses)	34.2	(21.5)	0.3
Income tax (expense)/benefit related to unrealized holding gains/(losses)	(12.4)	7.7	(0.4)
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income	(0.1)	(0.3)	(0.6)
Income tax expense on reclassification adjustment for the net gain on sale of available-for-sale securities		0.1	0.2
Total other comprehensive income/(loss), net of tax	21.7	(14.0)	(0.5)
Ending balance	29.2	7.5	21.5
Total tax expense/(benefit) included in other comprehensive income/(loss)	$ 12.4	$ (7.8)	$ 0.2

XML

Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Supplemental Cash Flow Information [Abstract]
Income taxes paid	$ 369.9	$ 372.8	$ 317.8
Lease incentives received	$ 4.3	$ 8.5	$ 6.7

XML

Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended			22 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014	Nov. 30, 2013
401 (K) Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Maximum percentage of salary deferral	50.00%
Years of service to be eligible for matching contribution	1 year
Minimum number of hours worked for eligibility	41 days 16 hours
Percentage of employer matching contributions of eligible employee pay	50.00%			50.00%
Percentage of employee pay eligible for employer matching contributions	8.00%			6.00%
Company contributions to the plan	$ 21.4	$ 19.6	$ 16.4
Percentage participant directed	100.00%
Deferred Compensation Plans [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of annual base salary and bonus that eligible employees may defer	50.00%
Percentage of Board cash compensation that eligible outside directors may defer	100.00%
Amounts accrued under deferred compensation plans	$ 14.9	$ 14.2

XML

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	12 Months Ended
	Jun. 30, 2016	Jul. 31, 2016	May 31, 2016	May 31, 2015	May 31, 2014
Other Commitments [Line Items]
Rent expense			$ 39.8	$ 39.4	$ 39.1
Minimum future payment obligations under purchase orders and legally binding contractual arrangements			109.6
Commitments to purchase capital assets			6.8
Line of Credit [Member]
Other Commitments [Line Items]
Amounts outstanding			0.0
Revolving Credit Facility [Member]
Other Commitments [Line Items]
Amounts outstanding			$ 0.0
Initiation date			Aug. 05, 2015
Expiration term			5 years
Expiration date			Aug. 05, 2020
Maximum borrowing capacity			$ 1,000.0
Number of days borrowed			5 days	2 days
Standby Letters of Credit [Member]
Other Commitments [Line Items]
Maximum borrowing capacity			$ 43.0	$ 43.0
Amounts outstanding			$ 0.0
Minimum [Member] | Standby Letters of Credit [Member]
Other Commitments [Line Items]
Expiration date			Apr. 01, 2017
Maximum [Member] | Standby Letters of Credit [Member]
Other Commitments [Line Items]
Expiration date			Jul. 01, 2017
Terminated Agreement [Member] | Revolving Credit Facility [Member]
Other Commitments [Line Items]
Expiration date			Jun. 21, 2018
Maximum borrowing capacity			$ 750.0
Subsequent Event [Member] | Revolving Credit Facility [Member]
Other Commitments [Line Items]
Borrowings	$ 100.0
Number of days borrowed	1 day
PNC Bank, National Association [Member] | Line of Credit [Member]
Other Commitments [Line Items]
Expiration date			Feb. 27, 2017
PNC Bank, National Association [Member] | Revolving Credit Facility [Member]
Other Commitments [Line Items]
Amounts outstanding			$ 0.0
Expiration term			3 years
Expiration date			Mar. 17, 2019
Maximum borrowing capacity			$ 150.0
PNC Bank, National Association [Member] | Subsequent Event [Member] | Revolving Credit Facility [Member]
Other Commitments [Line Items]
Borrowings		$ 56.0

XML

Commitments and Contingencies (Amount Available) (Details) - Line of Credit [Member] $ in Millions	12 Months Ended
	May 31, 2016 USD ($)
JP Morgan Chase Bank, N.A. [Member]
Line of Credit Facility [Line Items]
Amount available	$ 350
Expiration date	Feb. 27, 2017
Bank of America, N.A. [Member]
Line of Credit Facility [Line Items]
Amount available	$ 250
Expiration date	Feb. 28, 2017
PNC Bank, National Association [Member]
Line of Credit Facility [Line Items]
Amount available	$ 150
Expiration date	Feb. 27, 2017
Wells Fargo Bank, National Association [Member]
Line of Credit Facility [Line Items]
Amount available	$ 150
Expiration date	Feb. 27, 2017

XML

Commitments and Contingencies (Amount Borrowed) (Details) - Revolving Credit Facility [Member] - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015
Line of Credit Facility [Line Items]
Number of days borrowed	5 days	2 days
Maximum amount borrowed	$ 450.0	$ 150.0
Average amount borrowed	$ 305.0	$ 125.0
Weighted-average interest rate	3.39%	3.25%

XML

Commitments and Contingencies (Future Minimum Operating Lease Payments) (Details) $ in Millions	May 31, 2016 USD ($)
Commitments and Contingencies [Abstract]
Year ending May 31, 2017	$ 35.7
Year ending May 31, 2018	28.5
Year ending May 31, 2019	20.0
Year ending May 31, 2020	12.9
Year ending May 31, 2021	7.4
Thereafter	$ 2.2

XML

Commitments and Contingencies (Minimum Future Payment Obligations) (Details) $ in Millions	May 31, 2016 USD ($)
Commitments and Contingencies [Abstract]
Year ending May 31, 2017	$ 73.5
Year ending May 31, 2018	20.5
Year ending May 31, 2019	7.6
Year ending May 31, 2020	4.4
Year ending May 31, 2021	3.0
Thereafter	$ 0.6

XML

Related Parties (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
EMC Corporation [Member]
Related Party Transaction [Line Items]
Purchases from related parties	$ 4.9	$ 6.9	$ 4.7
Staples, Inc. [Member]
Related Party Transaction [Line Items]
Purchases from related parties	$ 2.3	$ 1.7	$ 1.3

XML

Quarterly Financial Data (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended																12 Months Ended
	May 31, 2016		Feb. 29, 2016		Nov. 30, 2015		Aug. 31, 2015		May 31, 2015		Feb. 28, 2015		Nov. 30, 2014		Aug. 31, 2014		May 31, 2016		May 31, 2015		May 31, 2014
Quarterly Financial Data [Abstract]
Service revenue	$ 741.6		$ 740.7		$ 711.3		$ 712.2		$ 681.4		$ 693.6		$ 665.9		$ 656.6		$ 2,905.8		$ 2,697.5		$ 2,478.2
Interest on funds held for clients	12.3		11.9		11.1		10.8		10.8		10.7		10.4		10.2		46.1		42.1		40.7
Total revenue	753.9		752.6		722.4		723.0		692.2		704.3		676.3		666.8		2,951.9		2,739.6		2,518.9
Operating income	276.3		280.0		294.2		296.1		251.6		264.3		270.2		267.5		1,146.6		1,053.6		982.7
Investment income/(loss), net	(0.2)		1.7		1.6		1.4		2.0		1.6		1.4		1.4		4.5		6.4		5.4
Income before income taxes	276.1		281.7		295.8		297.5		253.6		265.9		271.6		268.9		1,151.1		1,060.0		988.1
Income taxes	98.0		101.3		106.6		88.4		92.4		96.5		98.6		97.6		394.3		385.1		360.6
Net income	$ 178.1		$ 180.4		$ 189.2		$ 209.1		$ 161.2		$ 169.4		$ 173.0		$ 171.3		$ 756.8		$ 674.9		$ 627.5
Basic earnings per share	$ 0.49	[1]	$ 0.50	[1]	$ 0.52	[1]	$ 0.58	[1]	$ 0.44	[1]	$ 0.47	[1]	$ 0.48	[1]	$ 0.47	[1]	$ 2.10	[1]	$ 1.86	[1]	$ 1.72
Diluted earnings per share	$ 0.49	[1]	$ 0.50	[1]	$ 0.52	[1]	$ 0.58	[1]	$ 0.44	[1]	$ 0.46	[1]	$ 0.47	[1]	$ 0.47	[1]	$ 2.09	[1]	$ 1.85	[1]	$ 1.71
Weighted-average common shares outstanding	360.3		360.5		360.7		361.1		362.3		363.2		363.0		363.1		360.7		362.9		364.5
Weighted-average common shares outstanding, assuming dilution	360.7		362.2		362.3		362.8		364.5		365.0		364.6		364.7		362.5		364.6		366.1
Cash dividends per common share	$ 0.42		$ 0.42		$ 0.42		$ 0.42		$ 0.38		$ 0.38		$ 0.38		$ 0.38		$ 1.68		$ 1.52		$ 1.40
Total net realized gains			$ 0.1	[2]					$ 0.1	[2]			$ 0.1	[2]	$ 0.1	[2]	$ 0.1	[2]	$ 0.3	[2]	$ 0.6

[1] Each quarter is a discrete period and the sum of the four quarters' basic and diluted earnings per share amounts may not equal the full year amount.

[2] Total net realized gains on the combined funds held for clients and corporate investment portfolios.

XML

Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2016	May 31, 2015	May 31, 2014
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance as of beginning of fiscal year		$ 1.4	$ 1.5	$ 1.0
Additions charged to expenses		2.5	1.6	2.5
Additions to/(Deductions from) other accounts	[1]	2.0	0.1
Costs and deductions	[2]	1.7	1.8	2.0
Balance as of end of fiscal year		4.2	1.4	1.5
Reserve for Client Fund Losses [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance as of beginning of fiscal year		1.8	1.9	2.4
Additions charged to expenses		2.4	2.0	2.2
Additions to/(Deductions from) other accounts	[1]		(0.2)
Costs and deductions	[2]	2.2	1.9	2.7
Balance as of end of fiscal year		$ 2.0	$ 1.8	$ 1.9

[1] Amounts related to business acquisitions.

[2] Uncollectible amounts written off, net of recoveries.