10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_____________________________

FORM 10-K

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

EXCHANGE ACT OF 1934

For the fiscal year ended May 31, 2015

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 þ    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 þ

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 þ    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 þ    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.    þ

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    þ	Accelerated filer    ¨	Non-accelerated filer    o	Smaller reporting company    o
		(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 þ

As of November 30, 2014, 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 $15,395,911,785 based on the closing price reported for such date on the NASDAQ Global Select Market.

As of June 30, 2015, 361,206,331 shares 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 14, 2015, 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, 2015

	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	13
Item 7A	Quantitative and Qualitative Disclosures About Market Risk	27
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

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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,” “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 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:

• general market 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 products and services 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 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.

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Item 1. Business

Incorporated in Delaware in 1979, we are a leading provider of payroll, human resource, insurance, and benefits outsourcing solutions for small- to medium-sized businesses. As of May 31, 2015, we serviced approximately 590,000 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 human capital management (“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 Flex^SM is our 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, performance management, 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 Android^TM 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.

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Small-Business Clients

For our small-business clients, which we define as typically less than 50 employees, Paychex aides 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. 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 defined as typically more than 50 employees and have 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 tied together by 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, and we are subject to cash penalties imposed by tax or regulatory agencies for late filings and late or under payment of taxes.

• 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.

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• 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, Inc. The integration of the sales and service models of the ASO and PEO under Paychex HR Services has reduced redundancies and created more flexible options for business owners to find the solution that best meets their needs. 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, 2015, Paychex HR Services was utilized by 31,000 clients with approximately 858,000 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 financial advisors. As of May 31, 2015, retirement services covered approximately 70,000 plans and the asset value of participants' funds externally managed totaled approximately $23.5 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 U.S. health care reform legislation. 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.

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• Online HR administration services:    We offer online 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. They 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 are in their infancy, but offer additional value-added benefits for small-business owners. These services include a cloud-based accounting service, payment processing services, payment distribution services, an 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. Within retirement services we have a dedicated, wholesale sales force focused solely on enhancing our relationships with financial advisors. 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 association, 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 Solutions^TM 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 2016. We also enhanced our relationships with CPAs by partnering 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.

Advantage Payroll Services Inc. (“Advantage”), a wholly owned subsidiary of Paychex, Inc., 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. The marketing and selling by the Associates is conducted under their own logos.

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Paychex also builds on its reputation as an expert in the payroll and human resources 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.

A section of both the Paychex website, www.paychex.com, and our insurance services website, www.paychexinsurance.com, is designated to the topic of health care reform to provide answers, information, and solutions that employers need to prepare for and take action relating to the Patient Protection and Affordable Care Act of 2010 (“PPACA”) and the Health Care and Education Reconciliation Act of 2010, together with the PPACA, the (“Act”). Paychex is positioned to assist our clients and their employees as they navigate the complexity of this legislation.

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 10 million addressable businesses in the geographic markets that we currently serve within the U.S. Of those businesses, greater than 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 17 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, 2015 (“fiscal 2015”), client retention reached record levels, rising to over 82% of our beginning of the year client base. No single client has a material impact on total service revenue or results of operations.

The market for payroll processing and human resource 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, 2015, we employed approximately 13,000 people. None of our employees were covered by collective bargaining agreements.

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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.

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 investments 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 2015 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 Act was enacted in March 2010 and entails sweeping health care reforms with staggered effective dates from 2010 through 2018. Many provisions of the Act require the issuance of additional guidance from the U.S. Departments of Labor and Health & Human Services, the Internal Revenue Service (the “IRS”), and the States.

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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 Act. 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 on the next page regarding changes in health insurance and workers' compensation insurance rates and underlying claim trends for 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.

Our business and reputation may be affected by security breaches and other disruptions to our information technology infrastructure, which could compromise Company and personal customer information:    We rely upon information technology networks and systems to process, transmit, and store electronic information, and to support a variety of business processes. If we experience a problem with the functioning of key systems or a security breach of our systems, the resulting disruptions could have a material adverse effect on our business.

We also collect, use, and retain large amounts of personal information about our clients and their employees that is critical to the accurate and timely provision of services to our clients. This information includes bank account numbers, credit card numbers, tax return information, social security numbers, health care information, retirement account information, payroll information, and Paychex system passwords. In addition, we also collect and maintain personal information on our employees in the ordinary course of our business. As many of our services are web-based and mobile-application-based, the amount of data we store for our users on our servers has been increasing. Vulnerabilities, threats, and more sophisticated and targeted computer crime pose a risk to the security of our systems and networks, and the confidentiality, availability, and integrity of our data. We have security systems and information technology infrastructure in place designed to detect and protect against unauthorized access to such information. However, there is no guarantee that our systems and processes are adequate to protect against all security breaches. 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.

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.

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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.

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 rarely borrowed against available credit arrangements to meet 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. 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.

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.

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Item 2. Properties

We owned and leased the following properties as of May 31, 2015:

	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	189,000
Other U.S. locations	2,032,000
International locations	28,000
Total leased facilities	2,249,000

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.

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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, 2015, there were 13,351 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 6,948 participants in the Paychex, Inc. Employee Stock Purchase Plan and 5,043 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 2015 and the fiscal year ended May 31, 2014 (“fiscal 2014”) are as follows:

	Fiscal 2015			Fiscal 2014
	Sales prices		Cash dividends declared  per share	Sales prices		Cash dividends declared  per share
	High	Low		High	Low
First quarter	$42.66	$40.10	$0.38	$40.84	$35.75	$0.35
Second quarter	$48.20	$41.59	$0.38	$44.01	$36.80	$0.35
Third quarter	$50.19	$44.52	$0.38	$45.95	$39.86	$0.35
Fourth quarter	$51.72	$48.00	$0.38	$43.56	$39.80	$0.35

The closing price of our common stock as of May 29, 2015, as reported on the NASDAQ Global Select Market, was $49.41 per share.

In May 2014, the Board approved a program to repurchase up to $350 million of its common stock with authorization expiring on May 31, 2017. Shares of stock repurchased during the three months ended May 31, 2015 were purchased pursuant to the program and were retired.

The following table provides information relating to our repurchase of common stock during the three months ended May 31, 2015:

Period	Total number of shares purchased	Average price paid per share		Approximate dollar value of shares that may yet be purchased under the program
March 1, 2015 - March 31, 2015	—	$	—	$	279,566,285
April 1, 2015 - April 30, 2015	1,718,724	$	49.18	$	195,038,017
May 1, 2015 - May 31, 2015	560,458	$	48.95	$	167,604,108
Total for the period	2,279,182	$	49.12	$	167,604,108

The following graph shows a five-year comparison of the total cumulative returns of investing $100 on May 31, 2010, 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 on the following page).

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May 31,	2010	2011	2012	2013	2014	2015
Paychex	$100.00	$118.03	$114.27	$147.67	$168.69	$209.61
S&P 500	$100.00	$125.95	$125.43	$159.64	$192.28	$214.98
Peer Group	$100.00	$135.03	$127.75	$169.40	$210.42	$271.24

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 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

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Item 6. Selected Financial Data

In millions, except per share amounts Year ended May 31,	2015			2014 (1)			2013 (2)			2012			2011
Service revenue	$	2,697.5		$	2,478.2		$	2,285.2		$	2,186.2		$	2,036.2
Interest on funds held for clients	42.1			40.7			41.0			43.6			48.1
Total revenue	$	2,739.6		$	2,518.9		$	2,326.2		$	2,229.8		$	2,084.3
Operating income	$	1,053.6		$	982.7		$	904.8		$	853.9		$	786.4
Net income	$	674.9		$	627.5		$	569.0		$	548.0		$	515.3
Diluted earnings per share	$	1.85		$	1.71		$	1.56		$	1.51		$	1.42
Cash dividends per common share	$	1.52		$	1.40		$	1.31		$	1.27		$	1.24
Purchases of property and equipment	$	102.8		$	84.1		$	98.7		$	89.6		$	100.5
Cash and total corporate investments	$	936.4		$	936.8		$	874.6		$	790.0		$	671.3
Total assets	$	6,482.5		$	6,370.1		$	6,163.7		$	6,479.6		$	5,393.8
Total debt	$	—		$	—		$	—		$	—		$	—
Stockholders’ equity	$	1,785.5		$	1,777.0		$	1,773.7		$	1,604.5		$	1,496.2
Return on stockholders’ equity	36		%	35		%	34		%	34		%	35		%

⁽¹⁾  With the introduction of a new health care offering within the PEO, 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.

⁽²⁾  In the fourth quarter of fiscal 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.

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, 2015 (“fiscal 2015”), May 31, 2014 (“fiscal 2014”), and May 31, 2013 (“fiscal 2013”), and our financial condition as of May 31, 2015. 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 payroll, human resource, insurance, and benefits outsourcing solutions for small- to medium-sized businesses. We offer a comprehensive portfolio of human capital management (“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

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

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We support small-business companies through our core payroll, utilizing our robust Paychex Flex^SM 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 tied together by 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;

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

• other human resource services and products.

Our mission is to be the leading provider of payroll, human resource, 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 drive growth in clients, revenue, and profits. 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 2015 reflected sustained growth in our business. Payroll service revenue continued to experience steady growth of 4% for fiscal 2015 as compared with fiscal 2014, driven by growth in revenue per check and clients. We achieved a milestone of $1 billion of HRS revenue for fiscal 2015, as strong demand for our comprehensive human resource outsourcing solutions drove double-digit growth. Our sales execution was strong as we achieved significant growth in new annualized revenue. For the third year in a row, we achieved record levels of client retention, ending fiscal 2015in excess of82% of the beginning of the year client base.

Our financial results continue to be impacted by the interest rate environment as interest rates available on high-quality financial instruments remain low, but steady. The Federal Funds rate has been at a range of zero to 0.25% since December 2008. Our combined funds held for clients and corporate investment portfolios earned an average rate of return of 1.0% for fiscal years 2015, 2014, and 2013.

Highlights of our financial results for fiscal 2015, compared to fiscal 2014, are as follows:

• Total service revenue increased 9% to $2.7 billion.

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

◦ HRS revenue increased 18% to $1.0 billion.

• Interest on funds held for clients increased 3% to $42.1 million.

• Total revenue increased 9% to $2.7 billion.

• Operating income increased 7% to $1.1 billion.

• Net income and diluted earnings per share each increased 8% to $674.9 million and $1.85 per share, respectively.

• Dividends of $551.8 million were paid to stockholders, representing 82% of net income.

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Business Outlook

Our client base totaled approximately 590,000 clients as of May 31, 2015, compared to approximately 580,000 clients as of May 31, 2014, and approximately 570,000 clients as of May 31, 2013. Our client base increased approximately 2% for fiscal 2015 and fiscal 2014, up from growth of approximately 1% for fiscal 2013.

For fiscal 2015, payroll services client retention was at a record level in excess of82% of our beginning of the year client base. Our client satisfaction results remained high, which we believe is a result of our focus on providing innovative technology solutions and outstanding personal service to our clients to maximize client retention.

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 online 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 May 31, 2015	Growth rates for fiscal year
		2015		2014		2013
Paychex HR Services client worksite employees	858,000	12	%	14	%	9	%
Paychex HR Services clients	31,000	11	%	13	%	10	%
Health and benefits services applicants	142,000	6	%	3	%	8	%
Retirement services plans	70,000	6	%	5	%	4	%

We continue to position ourselves to capitalize on the opportunities arising from the shift to SaaS solutions as we increase our investment in product development relating to our SaaS capabilities and mobile applications. In fiscal 2015, we broadened our portfolio of value-added services, offering the following new or upgraded payroll and human resource services:

• We introduced Paychex Flex, a solution that includes our leading-edge, cloud-based platform and mobility applications, with a multi-tiered service offering, which streamlines workforce management through innovative technology and flexible choice of service. This provides a unique blend of both service and software that we believe differentiates us from our competitors. The comprehensive, cloud-based Paychex Flex platform offers powerful capabilities in a simple user experience that is adaptive to the needs of users across the HCM spectrum – recruiters and recruits, HR and payroll stakeholders, benefits administrators, employees, contractors, financial advisors, and accounting partners. All Paychex services, including payroll, time and attendance, HR, benefits, training, and performance management, are accessible on a single cloud-based platform with Paychex Single Sign-On. The mobile apps within Paychex Flex give employers access to the fullest set of employee data available on-the-go, in addition to plan-level views of retirement, health, and benefit accounts. Likewise, employees receive visibility into a wide set of personal and benefits data and functionality, including the industry’s broadest set of retirement self-service features.

• We also expanded our mobile applications by introducing mobile applications for our Paychex Accounting Online^® services, time and attendance, and our expense management solution. The Paychex Accounting Online mobile application allows users to access their Paychex Accounting Online account from their iPad^®, iPhone^®, and iPod Touch^® in order to keep track of their business finances anywhere and anytime. Paychex Time provides a mobile time punch app that offers the quickest mobile punch possible. The mobile interface for expense management provides clients and their employees with anytime, anywhere accessibility to view, review, and analyze expense reports, upload receipt images, and check on the status of an expense report.

• We acquired nettime solutions, LLC, a leading cloud-based time and attendance solutions provider. This small- business acquisition pairs Paychex’s exceptional customer service with the SaaS time and attendance technology of a market leader.

• We released the newest version of our applicant tracking system, myStaffingPro^®, which has expanded mobility and new features. These new features are designed to enhance the candidate experience by reducing data entry, improving completion rates, and providing the ability to create candidate differentiators. The improved candidate experience helps our clients increase their applicant pools and they can also utilize enhanced tools to screen applicants.

• Our full-service Paychex Employer Shared Responsibility (“ESR”) services are experiencing strong market acceptance. 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.

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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, 2015 remained strong with cash and total corporate investments of $936.4 million and no debt. Our investment strategy focuses 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 that are secured by a United States (“U.S.”) government escrow, and essential services revenue bonds. During fiscal 2015, our primary short-term investment vehicles were high quality variable rate demand notes (“VRDNs”) and bank demand deposit accounts.

A substantial portion of our portfolio is invested in high credit quality securities with AAA and AA ratings 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, 2015 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 was $895.2 million for fiscal 2015. Historically, we have funded our operations, capital purchases, business acquisitions, share repurchases, and dividend payments from our operating activities. Our positive cash flows in fiscal 2015 allowed us to support our business growth and to pay substantial dividends to our stockholders. During fiscal 2015, dividends paid to stockholders were 82% of net income. It is anticipated that cash and total corporate investments as of May 31, 2015, 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.

For further analysis of our results of operations for fiscal years 2015, 2014, and 2013, and our financial position as of May 31, 2015, 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, 2016 (“fiscal 2016”) is based upon current market, economic, and interest rate conditions continuing with no significant changes. Our expected fiscal 2016 payroll revenue growth rate is based upon anticipated client base growth and increases in revenue per check. Our anticipated HRS revenue growth for fiscal 2016 reflects the impact of the minimum premium plan offering within our PEO being in place for a full year in fiscal 2015.

Our fiscal 2016 guidance is as follows:

	Low			High
Payroll service revenue	4	%	—	5	%
HRS revenue	10	%	—	13	%
Total service revenue	7	%	—	8	%
Net income	8	%	—	9	%

Operating income, net of certain items, as a percent of total service revenue, is expected to be approximately 38% for fiscal 2016. The effective income tax rate for fiscal 2016 is expected to be consistent with that experienced in fiscal 2015.

Interest on funds held for clients for fiscal 2016 is expected to be relatively flat. The average rate of return on our combined funds held for clients and corporate investment portfolios is expected to be approximately 1.0% for fiscal 2016. As of May 31, 2015, the long-term investment portfolio had an average yield-to-maturity of 1.6% and an average duration of 3.2 years.

Purchases of property and equipment for fiscal 2016 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 2016 depreciation expense is projected to be in the range of $95 million to $105 million, and we project amortization of intangible assets for fiscal 2016 to be in the range of $10 million to $15 million.

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Results of Operations

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

In millions, except per share amounts	2015			Change		2014			Change		2013
Revenue:
Payroll service revenue	$	1,656.8		4	%	$	1,599.3		4	%	$	1,539.2
HRS revenue	1,040.7			18	%	878.9			18	%	746.0
Total service revenue	2,697.5			9	%	2,478.2			8	%	2,285.2
Interest on funds held for clients	42.1			3	%	40.7			(1	)%	41.0
Total revenue	2,739.6			9	%	2,518.9			8	%	2,326.2
Combined operating and SG&A expenses	1,686.0			10	%	1,536.2			8	%	1,421.4
Operating income	1,053.6			7	%	982.7			9	%	904.8
Investment income, net	6.4			17	%	5.4			(18	)%	6.6
Income before income taxes	1,060.0			7	%	988.1			8	%	911.4
Income taxes	385.1			7	%	360.6			5	%	342.4
Effective income tax rate	36.3		%			36.5		%			37.6		%
Net income	674.9			8	%	$	627.5		10	%	$	569.0
Diluted earnings per share	$	1.85		8	%	$	1.71		10	%	$	1.56

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, 2015, we had no exposure to high-risk or illiquid investments and had insignificant exposure to European investments. Details regarding our combined funds held for clients and corporate investment portfolios are as follows:

	Year ended May 31,
$ in millions	2015			2014			2013
Average investment balances:
Funds held for clients	$	4,080.0		$	3,968.7		$	3,811.9
Corporate investments	1,011.5			973.8			834.7
Total	$	5,091.5		$	4,942.5		$	4,646.6
Average interest rates earned (exclusive of net realized gains):
Funds held for clients	1.0		%	1.0		%	1.1		%
Corporate investments	0.7		%	0.7		%	0.8		%
Combined funds held for clients and corporate investments	1.0		%	1.0		%	1.0		%
Total net realized gains	$	0.3		$	0.6		$	0.9

$ in millions As of May 31,	2015			2014			2013
Net unrealized gains on available-for-sale securities(1)	$	13.6		$	34.5		$	34.7
Federal Funds rate(2)	0.25		%	0.25		%	0.25		%
Total fair value of available-for-sale securities	$	3,595.6		$	3,391.4		$	3,691.4
Weighted-average duration of available-for-sale securities in years(3)	3.2			3.0			3.1
Weighted-average yield-to-maturity of available-for-sale securities(3)	1.6		%	1.6		%	1.8		%

⁽¹⁾  The net unrealized gain on our investment portfolios was approximately $20.9 million as of July 16, 2015.

⁽²⁾  The Federal Funds rate was a range of zero to 0.25% as of May 31, 2015, 2014, and 2013.

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

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Payroll service revenue:  Payroll service revenue was $1.7 billion for fiscal 2015 and $1.6 billion for fiscal 2014, reflecting growth of 4% compared to each of the respective prior fiscal year periods. Both fiscal 2015 and fiscal 2014 benefited from increases in revenue per check and clients. In addition, fiscal 2014 revenue benefited from an increase in checks per payroll. Growth in checks per payroll was flat for fiscal 2015. Revenue per check was positively impacted by price increases and increased product penetration, partially offset by discounting during the fiscal year.

For fiscal 2015 and fiscal 2014, our total payroll client base growth was approximately 2%. Client retention reached record levels for both years and was in excess of82% of the beginning of the year client base for fiscal 2015 and was approximately82% of the beginning of the year client base for fiscal 2014.

Human Resource Services revenue:  HRS revenue was $1.0 billion for fiscal 2015 and $878.9 million for fiscal 2014, reflecting growth of 18% compared to each of the respective prior fiscal year periods. This growth was positively impacted by the minimum premium plan health insurance offering for our PEO clients and their employees, which was introduced in the second half of fiscal 2014. This product offering contributed six percentage points of the fiscal 2015 growth in HRS revenue compared to three percentage points for fiscal 2014.

For both fiscal 2015 and fiscal 2014, the growth in HRS revenue was attributable to client base growth, as reflected in the table below. The most significant of these contributors are as follows:

• Paychex HR Services revenue, our largest HRS revenue stream at slightly less than one-half of HRS revenue for fiscal 2015, was positively impacted by an 11% growth in clients and a 12% growth in client worksite employees. For fiscal 2014, Paychex HR Services revenue benefited from a 13% increase in clients and a 14% increase in client worksite employees. During both fiscal 2015 and fiscal 2014, the PEO experienced strong demand contributing to the increase in the growth rate for Paychex HR Services revenue.

• Retirement services revenue is our second largest HRS revenue stream. Retirement services revenue for fiscal 2015 benefited from pricing, along with a 6% growth in the number of plans served and 7% growth in the average asset value of retirement services participants' funds. Retirement services revenue for fiscal 2014 reflected a 5% increase in the number of plans served, price increases, and a 13% increase in the asset value of retirement services participant's funds. The asset fee revenue earned on the value of participants' funds for fiscal 2014 was partially offset by the impact from a shift in the mix of assets within these funds to investments that earn lower fees from external managers.

• Insurance services revenue growth for both fiscal 2015 and fiscal 2014 reflected increases in premiums and clients for workers' compensation insurance services and in the number of health and benefits applicants. In fiscal 2015, insurance services revenue benefited from the introduction of our full service product aimed at assisting clients with health care reform requirements, which has gained market acceptance.

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

HRS product key statistics are as follows:

$ in billions As of May 31,	2015		Change		2014		Change		2013
Paychex HR Services client worksite employees	858,000		12	%	766,000		14	%	672,000
Paychex HR Services clients	31,000		11	%	28,000		13	%	25,000
Health and benefits services applicants	142,000		6	%	134,000		3	%	131,000
Retirement services plans	70,000		6	%	66,000		5	%	62,000
Asset value of retirement services participants’ funds	$	23.5	7	%	$	21.9	13	%	$	19.3

Total service revenue:  Total service revenue increased 9% for fiscal 2015 and 8% for fiscal 2014, attributable to the factors previously discussed.

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Interest on funds held for clients:  Interest on funds held for clients increased 3% for fiscal 2015 after decreasing 1% for fiscal 2014. For fiscal 2015, the increase was primarily due to an increase in average investment balances, while average interest rates earned were flat. For fiscal 2014, the decline was the result of lower average interest rates earned, partially offset by an increase in average investment balances. The lower average interest rates earned in fiscal 2014 were the result of lower yields on high quality financial instruments.

Average investment balances for funds held for clients increased 3% for fiscal 2015 and 4% for fiscal 2014. The increase in average investment balances for fiscal 2015 was mainly driven by increases in client base and wage inflation. The increase for fiscal 2014 was largely due to the expiration of certain payroll tax cuts on December 31, 2012, which resulted in higher employee social security withholdings, along with increases in checks per payroll and 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.

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

In millions	2015		Change		2014		Change		2013
Compensation-related expenses	$	1,096.8	9	%	$	1,003.9	5	%	$	955.8
Depreciation and amortization	106.6		2	%	105.0		7	%	98.2
Other expenses	482.6		13	%	427.3		16	%	367.4
Total expenses	$	1,686.0	10	%	$	1,536.2	8	%	$	1,421.4

Total expenses increased 10% for fiscal 2015 and 8% for fiscal 2014. Both fiscal 2015 and fiscal 2014 were impacted by costs relating to the new minimum premium plan health insurance offering within our PEO, which contributed three percentage points of the increase in total expenses for fiscal 2015 and two percentage points for fiscal 2014.

The increases in total expenses were driven largely by growth in compensation-related expenses. 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. For fiscal 2014, compensation-related expenses increased due to higher wages and performance-based compensation costs. The increase in wages was largely related to investments in product development and supporting technology, as well as sales force investment initiatives that began in fiscal 2013. As of May 31, 2015, we had approximately 13,000 employees, compared with 12,700 employees as of May 31, 2014.

Depreciation expense is primarily related to buildings, furniture and fixtures, data processing equipment, and software. Increases in depreciation expense were due to capital expenditures as we invested in technology and continued to grow our business. The higher growth rate for fiscal 2014 was related to additional internally developed software related to our leading-edge, cloud-based platform that was placed in service during the year. Amortization of intangible assets is primarily related to client list acquisitions, which are amortized using either straight-line or accelerated methods.

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 costs relating to the new minimum premium plan health care offering in the PEO. In addition, continued investment in product development and supporting technology impacted other expense growth for both fiscal 2015 and fiscal 2014.

Operating income:  Operating income increased 7% for fiscal 2015 and 9% for fiscal 2014. 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	2015			Change		2014			Change		2013
Operating income	$	1,053.6		7	%	$	982.7		9	%	$	904.8
Excluding: Interest on funds held for clients	(42.1		)	3	%	(40.7		)	(1	)%	(41.0		)
Operating income, net of certain items (1)	$	1,011.5		7	%	$	942.0		9	%	$	863.8

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

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Operating income, net of certain items, as a percentage of service revenue was approximately 38% for each of the fiscal years 2015, 2014, and 2013. Operating income, net of certain items, for fiscal 2015 and fiscal 2014 was impacted by the growth in the minimum premium plan within the PEO. This product offering is a lower-margin product.

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.

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, increased 17% for fiscal 2015 as the result of an increase in average investment balances, while interest rates earned remained relatively flat. Investment income decreased 18% for fiscal 2014 as a result of lower average interest rates earned on investments, partially offset by an increase in average investment balances. Average investment balances increased 4% for fiscal 2015 and 17% for fiscal 2014. The increases were the result of investment of cash generated from operations. The lower rate of growth in average investment balances for fiscal 2015 is the result of cash outflows for stock repurchases in fiscal 2015 and the later half of fiscal 2014.

Income taxes:  Our effective income tax rate was 36.3% for fiscal 2015 compared to 36.5% for fiscal 2014 and 37.6% for fiscal 2013. The higher effective tax rate for fiscal 2013 was the result of the settlement of a state income tax matter. Refer to Note I 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 8% to $674.9 million for fiscal 2015 and 10% to $627.5 million for fiscal 2014. Diluted earnings per share increased 8% to $1.85 per share for fiscal 2015 and 10% to $1.71 per share for fiscal 2014. These fluctuations were attributable to the factors previously discussed. The growth rates for fiscal 2014 were impacted by the settlement of a state income tax matter, which reduced diluted earnings per share by approximately $0.04 per share for fiscal 2013.

Liquidity and Capital Resources

Our financial position as of May 31, 2015 remained strong with cash and total corporate investments of $936.4 million and no debt. We believe that our investments as of May 31, 2015 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, 2015, 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, 2015, 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 28, 2016
Bank of America, N.A.	$250 million	February 28, 2016
PNC Bank, National Association	$150 million	February 28, 2016
Wells Fargo Bank, National Association	$150 million	February 28, 2016

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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 2015 or as of May 31, 2015.

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

Credit facility: In June 2013, we entered into a committed, unsecured, five-year syndicated credit facility, expiring on June 21, 2018. Under the credit facility, Paychex of New York LLP (the “Borrower”) may, subject to certain restrictions, borrow up to $750 million to meet short-term funding requirements. In July 2014, supplemental agreements were executed increasing the maximum borrowing capacity under the facility from $500 million to $750 million. The obligations under this facility have been guaranteed by us and certain of our 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 June 2018, any borrowings outstanding will mature and be payable on such date.

There were no amounts outstanding under this credit facility as of May 31, 2015. During fiscal 2015, we borrowed against this facility, for one day each, as follows:

$ in millions Fiscal quarter	Amount borrowed		Interest rate
First quarter	$	100.0	3.25	%
Second quarter	$	150.0	3.25	%
Third quarter	$	—	—
Fourth quarter	$	—	—

Certain lenders under this credit facility, and their respective affiliates, have performed, and may in the future perform for us and our 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.

Letters of credit:  As of May 31, 2015, 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 2015 and April 2016, and are collateralized by securities held in our investment portfolios. No amounts were outstanding on these letters of credit during fiscal 2015 or as of May 31, 2015. Subsequent to May 31, 2015, the letter of credit expiring in July 2015 was renewed through July 2016.

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, 2015. The table below summarizes our estimated annual payment obligations under these commitments as of May 31, 2015:

	Payments due by period
In millions	Total		Less than 1  year		1-3 years		4-5 years		More than 5  years
Operating leases(1)	$	127.7	$	37.5	$	54.3	$	27.4	$	8.5
Purchase obligations(2)	104.8		71.2		31.2		2.2		0.2
Total	$	232.5	$	108.7	$	85.5	$	29.6	$	8.7

⁽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 $9.5 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.

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The liability for uncertain tax positions, including interest and net of federal benefits, was approximately $29.1 million as of May 31, 2015. Refer to Note I 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 $62.4 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 2015, 2014, and 2013 was $15.1 million, $14.4 million, and $12.6 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, 2015.

Operating Cash Flow Activities

	Year ended May 31,
In millions	2015		2014		2013
Net income	$	674.9	$	627.5	$	569.0
Non-cash adjustments to net income	211.4		198.6		183.3
Cash provided by/(used in) changes in operating assets and liabilities	8.9		54.8		(77.0		)
Net cash provided by operating activities	$	895.2	$	880.9	$	675.3

The increase in our operating cash flows for fiscal 2015 compared to fiscal 2014 is primarily the result of higher net income, adjusted for non-cash items, partially offset by the impact of fluctuations in our operating assets and liabilities. The increase in our operating cash flows for fiscal 2014 compared to fiscal 2013 was primarily the result of higher net income, adjusted for non-cash items, along with the positive impact from fluctuations in operating assets and liabilities. Non-cash adjustments to net income increased for both fiscal 2015 and fiscal 2014, compared to the respective prior year periods, 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 periods were primarily related to the timing of collections from clients and payments for compensation, PEO payroll, income tax, and other liabilities. Income taxes contributed significantly to the fluctuations as a result of a higher prepaid income tax position as of May 31, 2013 that arose from the federal benefit on the settlement of a state tax matter during fiscal 2013.

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Investing Cash Flow Activities

	Year ended May 31,
In millions	2015			2014			2013
Net change in funds held for clients and corporate investment activities	$	(151.8	)	$	(211.4	)	$	306.8
Purchases of property and equipment	(102.8		)	(84.1		)	(98.7		)
Acquisition of businesses, net of cash acquired	(27.1		)	(9.3		)	(21.3		)
Purchases of other assets	(3.3		)	(11.3		)	(5.1		)
Net cash (used in)/provided by investing activities	$	(285.0	)	$	(316.1	)	$	181.7

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 E 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 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. For fiscal 2014 compared to fiscal 2013, there was a significant timing impact. There was a large cash outflow on Friday, May 31, 2013 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 2013. See further discussion of this timing in the financing cash flows discussion of net change in client fund obligations. Our net cash inflow from funds held for clients and corporate investment activities for fiscal 2013 was partially offset by higher purchases than sales of VRDN securities during the year.

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 2015, 2014, and 2013, we purchased approximately $6.9 million, $4.7 million, and $6.5 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 years 2015, 2014, and 2013, we paid, net of cash acquired, $27.1 million, $9.3 million, and $21.3 million, respectively, for immaterial business acquisitions.

Financing Cash Flow Activities

	Year ended May 31,
In millions, except per share amounts	2015			2014			2013
Net change in client fund obligations	$	93.0		$	127.4		$	(454.6	)
Dividends paid	(551.8		)	(510.6		)	(476.7		)
Repurchases of common shares	(182.4		)	(249.7		)	—
Equity activity related to stock-based awards	48.5			113.3			72.8
Net cash used in financing activities	$	(592.7	)	$	(519.6	)	$	(858.5	)
Cash dividends per common share	$	1.52		$	1.40		$	1.31

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.

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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. May 31, 2015 fell on a Sunday, May 31, 2014 fell on a Saturday, and May 31, 2013 fell on a Friday. 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.

Timing did have an impact for fiscal 2013, resulting in a net cash outflow position. May 31, 2012 was a Thursday, a large cash collection day for direct deposit funds, so we had higher client funds on hand at that date. As May 31, 2013 was a Friday and a cash outflow day for direct deposit, client funds on hand were lower. As a result, there was a net cash outflow over the period in fiscal 2013.

Dividends paid:  In July 2014, the Board increased our quarterly dividend to stockholders by 9% to $0.38 per share from $0.35 per share. In July 2013, the Board increased our quarterly dividend to stockholders by 6% to $0.35 per share from $0.33 per share. The dividends paid as a percentage of net income totaled 82%, 81%, and 84% for fiscal years 2015, 2014, and 2013, 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. During fiscal 2015, we repurchased 3.9 million shares for a total of $182.4 million. In fiscal 2014, we repurchased 6.2 million shares for a total of $249.7 million under a previously authorized program to purchase 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 2015 compared to fiscal 2014 was largely driven by a decrease in proceeds from the exercise of stock options. The increase in activity for stock-based awards for fiscal 2014 compared to fiscal 2013 was driven by an increase in proceeds from the exercise of stock options. Common shares acquired through the exercise of stock options were 1.6 million shares, 3.4 million shares, and 2.4 million shares for fiscal years 2015, 2014, and 2013, respectively. Refer to Note D 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. 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.

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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. In fiscal 2014, with the addition of a new health care offering within the PEO, direct costs related to certain benefit plans where the Company retains risk were 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 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 variety 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 a reporting unit. We have the option to perform a qualitative assessment to determine if it is more-likely-than-not that the fair value of a reporting unit has declined below its carrying value. This assessment considers various financial, macroeconomic, industry, and reporting unit specific qualitative factors. Our business is largely homogeneous and, as a result, goodwill is associated with one reporting unit. We perform our annual impairment testing in our fiscal fourth quarter. Based on the results of our reviews, no impairment loss was recognized in the results of operations for fiscal years 2015, 2014, or 2013. 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 D 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 of 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 I 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. 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 2015, our primary short-term investment vehicles were bank demand deposit accounts and VRDNs. 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 2015, the average interest rate earned on our combined funds held for clients and corporate investment portfolios was 1.0%, comparable the average interest rate earned for fiscal 2014 and fiscal 2013. 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, 2015 had an average duration of 3.2 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, 2015 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, 2015
In millions	Amortized  cost		Fair  value
Maturity date:
Due in one year or less	$	345.8	$	347.8
Due after one year through three years	726.3		734.3
Due after three years through five years	800.9		802.0
Due after five years	1,709.0		1,711.5
Total	$	3,582.0	$	3,595.6

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 remained at a range of zero to 0.25% throughout fiscal years 2015, 2014, and 2013.

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 $5.1 billion for fiscal 2015. 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 $13.6 million as of May 31, 2015, compared with an unrealized gain of $34.5 million as of May 31, 2014. Refer to Note F 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 2015, the net unrealized gain on our investment portfolios ranged from $9.5 million to $55.9 million. During fiscal 2014, the net unrealized gain/(loss) on our investment portfolios ranged from an unrealized loss of $12.8 million to an unrealized gain of $42.7 million. The net unrealized gain on our investment portfolios was approximately $20.9 million as of July 16, 2015.

As of May 31, 2015 and 2014, we had $3.6 billion and $3.4 billion, respectively, invested in available-for-sale securities at fair value. The weighted-average yield-to-maturity was 1.6% as of May 31, 2015 and 2014, 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, 2015, 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, 2015 were not other-than-temporarily impaired. While $923.0 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 $7.5 million was due to changes in interest rates and was not due to increased credit risk or other valuation concerns. A substantial portion of these securities in an unrealized loss position as of May 31, 2015 and 2014 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.

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
Reports of Independent Registered Public Accounting Firms	31
Consolidated Statements of Income and Comprehensive Income for the Years Ended May 31, 2015, 2014, and 2013	33
Consolidated Balance Sheets as of May 31, 2015 and 2014	34
Consolidated Statements of Stockholders’ Equity for the Years Ended May 31, 2015, 2014, and 2013	35
Consolidated Statements of Cash Flows for the Years Ended May 31, 2015, 2014, and 2013	36
Notes to Consolidated Financial Statements	37
Schedule II — Valuation and Qualifying Accounts for the Years Ended May 31, 2015, 2014, and 2013	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, 2015. 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, 2015.

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, 2015, 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 at May 31, 2015 and May 31, 2014, and the results of their operations and their cash flows for each of the two years in the period ended May 31, 2015 in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule listed in the accompanying index appearing under Item 8 for the year ended May 31, 2015 presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of May 31, 2015, 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 accompanyingReport 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 21, 2015

31

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors

and Stockholders of Paychex, Inc.

We have audited the accompanying consolidated statements of income and comprehensive income, stockholders’ equity, and cash flows of Paychex, Inc. for the year ended May 31, 2013. Our audit also included the financial statement schedule listed in the Index at Item 15(a) for the year ended May 31, 2013. These financial statements and schedule are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements and schedule based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audit provides a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated results of the operations and cash flows of Paychex, Inc. for the year ended May 31, 2013, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, the related financial statement schedule for the year ended May 31, 2013, when considered in relation to the basic financial statements taken as a whole, presents fairly in all material respects the information set forth therein.

/s/ Ernst & Young LLP

Rochester, New York

July 22, 2013

32

PAYCHEX, INC.

CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

In millions, except per share amounts

Year ended May 31,	2015			2014			2013
Revenue:
Service revenue	$	2,697.5		$	2,478.2		$	2,285.2
Interest on funds held for clients	42.1			40.7			41.0
Total revenue	2,739.6			2,518.9			2,326.2
Expenses:
Operating expenses	808.0			732.5			671.3
Selling, general and administrative expenses	878.0			803.7			750.1
Total expenses	1,686.0			1,536.2			1,421.4
Operating income	1,053.6			982.7			904.8
Investment income, net	6.4			5.4			6.6
Income before income taxes	1,060.0			988.1			911.4
Income taxes	385.1			360.6			342.4
Net income	$	674.9		$	627.5		$	569.0
Other comprehensive loss, net of tax:
Unrealized losses on securities, net of tax	(14.0		)	(0.5		)	(15.7		)
Total other comprehensive loss, net of tax	(14.0		)	(0.5		)	(15.7		)
Comprehensive income	$	660.9		$	627.0		$	553.3
Basic earnings per share	$	1.86		$	1.72		$	1.56
Diluted earnings per share	$	1.85		$	1.71		$	1.56
Weighted-average common shares outstanding	362.9			364.5			363.8
Weighted-average common shares outstanding, assuming dilution	364.6			366.1			364.7
Cash dividends per common share	$	1.52		$	1.40		$	1.31

See Notes to Consolidated Financial Statements.

33

PAYCHEX, INC.

CONSOLIDATED BALANCE SHEETS

In millions, except per share amount

As of May 31,	2015		2014
Assets
Cash and cash equivalents	$	170.0	$	152.5
Corporate investments	366.6		398.7
Interest receivable	37.9		36.3
Accounts receivable, net of allowance for doubtful accounts	176.6		149.4
Deferred income taxes	15.0		12.0
Prepaid income taxes	12.9		17.2
Prepaid expenses and other current assets	50.8		37.8
Current assets before funds held for clients	829.8		803.9
Funds held for clients	4,273.4		4,198.6
Total current assets	5,103.2		5,002.5
Long-term corporate investments	399.8		385.6
Property and equipment, net of accumulated depreciation	353.9		342.2
Intangible assets, net of accumulated amortization	32.4		40.6
Goodwill	561.5		540.3
Deferred income taxes	—		37.1
Other long-term assets	31.7		21.8
Total assets	$	6,482.5	$	6,370.1
Liabilities
Accounts payable	$	51.7	$	48.8
Accrued compensation and related items	210.4		171.7
Deferred income taxes	—		6.6
Other current liabilities	50.8		44.7
Current liabilities before client fund obligations	312.9		271.8
Client fund obligations	4,260.1		4,167.1
Total current liabilities	4,573.0		4,438.9
Accrued income taxes	44.8		41.9
Deferred income taxes	16.8		55.7
Other long-term liabilities	62.4		56.6
Total liabilities	4,697.0		4,593.1
Commitments and contingencies — Note M
Stockholders’ equity
Common stock, $0.01 par value; Authorized: 600.0 shares; Issued and outstanding: 361.2 shares as of May 31, 2015 and 363.0 shares as of May 31, 2014, respectively.	3.6		3.6
Additional paid-in capital	880.1		794.4
Retained earnings	894.3		957.5
Accumulated other comprehensive income	7.5		21.5
Total stockholders’ equity	1,785.5		1,777.0
Total liabilities and stockholders’ equity	$	6,482.5	$	6,370.1

See Notes to Consolidated Financial Statements.

34

PAYCHEX, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

In millions

	Common stock					Additional paid-in capital			Retained earnings			Accumulated other comprehensive income
	Shares		Amount												Total
Balance as of May 31, 2012	362.6		$	3.6		$	561.1		$	1,002.1		$	37.7		$	1,604.5
Net income									569.0						569.0
Unrealized losses on securities, net of tax												(15.7		)	(15.7		)
Cash dividends declared									(476.7		)				(476.7		)
Stock-based compensation						22.9									22.9
Stock-based award transactions	2.8		0.1			75.5			(5.9		)				69.7
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

See Notes to Consolidated Financial Statements.

35

PAYCHEX, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

In millions

Year ended May 31,	2015			2014			2013
Operating activities
Net income	$	674.9		$	627.5		$	569.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization on property and equipment and intangible assets	106.6			105.0			98.2
Amortization of premiums and discounts on available-for-sale securities	76.2			70.3			56.2
Stock-based compensation costs	31.4			26.3			22.8
(Benefit)/provision for deferred income taxes	(4.1		)	(4.9		)	5.3
Provision for allowance for doubtful accounts	1.6			2.5			1.7
Net realized gains on sales of available-for-sale securities	(0.3		)	(0.6		)	(0.9		)
Changes in operating assets and liabilities:
Interest receivable	(1.6		)	(3.9		)	(1.8		)
Accounts receivable	(28.2		)	(18.2		)	8.3
Prepaid expenses and other current assets	(8.5		)	22.5			(45.6		)
Accounts payable and other current liabilities	51.1			45.1			(16.6		)
Net change in other assets and liabilities	(3.9		)	9.3			(21.3		)
Net cash provided by operating activities	895.2			880.9			675.3
Investing activities
Purchases of available-for-sale securities	(34,020.4		)	(29,850.5		)	(28,332.8		)
Proceeds from sales and maturities of available-for-sale securities	33,719.5			30,080.6			27,620.2
Net change in funds held for clients’ money market securities and other cash equivalents	149.1			(441.5		)	1,019.4
Purchases of property and equipment	(102.8		)	(84.1		)	(98.7		)
Acquisition of businesses, net of cash acquired	(27.1		)	(9.3		)	(21.3		)
Purchases of other assets	(3.3		)	(11.3		)	(5.1		)
Net cash (used in)/provided by investing activities	(285.0		)	(316.1		)	181.7
Financing activities
Net change in client fund obligations	93.0			127.4			(454.6		)
Dividends paid	(551.8		)	(510.6		)	(476.7		)
Repurchases of common shares	(182.4		)	(249.7		)	—
Equity activity related to stock-based awards	48.5			113.3			72.8
Net cash used in financing activities	(592.7		)	(519.6		)	(858.5		)
Increase/(decrease) in cash and cash equivalents	17.5			45.2			(1.5		)
Cash and cash equivalents, beginning of fiscal year	152.5			107.3			108.8
Cash and cash equivalents, end of fiscal year	$	170.0		$	152.5		$	107.3

See Notes to Consolidated Financial Statements.

36

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 payroll, human resource, insurance, and benefits outsourcing solutions 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, 2015 (“fiscal 2015”), 2014 (“fiscal 2014”), and 2013 (“fiscal 2013”). Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company as of May 31, 2015 and May 31, 2014. In addition, the Company has an equity method investment 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 human capital management (“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, online 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.

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. The Company has evaluated subsequent events for potential recognition and/or disclosure through the date of issuance of these financial statements.

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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 $1.4 million as of May 31, 2015 and $1.5 million as of May 31, 2014. 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 their respective portfolios are included in interest on funds held for clients and investment income, net.

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 restricted to 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 $561.5 million of goodwill as of May 31, 2015. 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. Impairment is determined by comparing the estimated fair value of a reporting unit to its carrying amount, including goodwill. The Company has the option to perform a qualitative assessment to determine if it is more-likely-than-not that the fair value of a reporting unit has declined below its carrying value. This assessment considers various financial, macroeconomic, industry, and reporting unit specific qualitative factors. The Company performs its annual impairment testing in its fiscal fourth quarter. Based on the results of the Company’s reviews, no impairment loss was recognized in the results of operations for fiscal years 2015, 2014, or 2013. Subsequent to the latest review, there have been no events or circumstances that indicate any potential impairment of the Company’s goodwill balance.

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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. 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 costs 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. In fiscal 2014, with the addition of a new health care offering within the PEO, we began classifying direct costs related to certain benefit plans where the Company retains risk 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 $4.2 billion, $3.4 billion, and $3.0 billion for fiscal years 2015, 2014, and 2013, 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 $1.0 million under both its fiscal 2015 and fiscal 2014 workers' compensation policies. As of May 31, 2015 and May 31, 2014, the Company had recorded current liabilities of $11.3 million and $8.5 million, respectively, and long-term liabilities of $15.3 million and $16.0 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 2015 and 2014 minimum premium health insurance plan policies. Amounts accrued related to the health insurance reserves are $8.1 million and $4.6 million as of May 31, 2015 and May 31, 2014, respectively. These amounts are included in current liabilities on the Consolidated Balance Sheet.

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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 D 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 $29.1 million as of May 31, 2015 and $29.8 million as of May 31, 2014. Refer to Note I for further discussion of the Company’s reserve for uncertain tax positions.

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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.

Recently adopted accounting pronouncements:  In November 2014, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) No. 2014-17, “Business Combinations (Topic 805) - Pushdown Accounting (a consensus of the FASB Emerging Issues Task Force).” This guidance provides the option for an acquired entity to apply pushdown accounting in its separately issued financial statements when a change-in-control event occurs. This guidance was effective for change-in-control events after November 18, 2014. Adoption of this guidance did not have any effect on the Company's consolidated financial statements.

In June 2014, the Company adopted FASB ASU 2013-11, “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the FASB Emerging Issues Task Force).” This ASU provides explicit guidance regarding the presentation in the statement of financial position of an unrecognized tax benefit when net operating losses or tax credit carryforwards exist. It was effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. Adoption of this guidance did not have an effect on the Company's consolidated financial statements.

In January 2014, the FASB issued ASU 2014-01, “Investments – Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force).” This ASU permits a company to make an accounting policy election to account for investments in qualified affordable housing projects under a new proportional amortization method. If such an election is not made, the ASU requires use of the equity or cost method for investments. The ASU is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014, with early adoption permitted. The Company currently accounts for its investments in qualified affordable housing projects using the equity method for investments and the adoption of this guidance did not have any effect on the its consolidated financial statements.

Recently issued accounting pronouncements:  In May 2015, the FASB issued ASU No. 2015-09, “Financial Services-Insurance (Topic 944): Disclosures about Short-Duration Contracts.” This guidance requires insurance entities to disclose for annual reporting periods incurred and paid claims development information by accident year, after reinsurance, for the number of years for which claims typically remain open. Disclosures should also include quantitative information about claim frequency and a qualitative description of methodologies used for determining claim frequency information. This guidance is effective for annual reporting periods, including interim periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early and retrospective application is permitted. The Company is currently evaluating this guidance, but does not anticipate it will have a material impact to its consolidated financial statements.

In May 2015, the FASB issued ASU No. 2015-07, “Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) (a consensus of the FASB Emerging Issues Task Force).” This guidance removes the requirement to categorize within the fair value hierarchy investments for which fair value is measured using the net asset value per share practical expedient and removes certain related disclosure requirements. This guidance is effective for annual reporting periods, including interim periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted. The Company does not anticipate this guidance will have a material impact to its consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-05, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement.” This guidance clarifies the accounting treatment for fees paid in cloud computing arrangements, including the determination of whether a cloud computing arrangement includes a software license.  This guidance is effective for annual reporting periods, including interim periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted. The Company is currently evaluating this guidance, but does not anticipate it will have a material impact to its consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, “Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs.” This Guidance requires debt issuance costs to be presented in the balance sheet as a reduction of the related debt liability rather than an asset. This guidance is effective for annual reporting periods, including interim periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted for financial statements not previously issued. The Company does not anticipate this guidance will have a material impact to its consolidated financial statements.

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In February 2015, the FASB issued ASU No. 2015-02 “Consolidation (Topic 810): Amendments to the Consolidation Analysis.” This guidance focuses on a reporting company’s consolidation evaluation to determine whether they should consolidate certain legal entities. This guidance is effective for annual periods beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted, including adoption in an interim period. The Company is currently evaluating this guidance, but does not anticipate it will have a material impact to its consolidated financial statements.

In January 2015, the FASB issued ASU No. 2015-01 “Income Statement - Extraordinary and Unusual Items (Subtopic 225-20)-Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items.” This guidance eliminates from GAAP the concept of extraordinary items and is effective for annual reporting periods, including interim reporting periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted. The Company does not anticipate it will have a material impact to its consolidated financial statements.

In June 2014, the FASB issued ASU No. 2014-12, “Compensation—Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (a consensus of the FASB Emerging Issues Task Force).” This guidance requires a performance target that affects vesting and that could be achieved after the requisite service period to be treated as a performance condition. The current accounting standard for stock-based compensation as it applies to awards with performance conditions should be applied. This guidance is effective for fiscal years, including interim reporting periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. The Company is currently evaluating this guidance, but does not anticipate it will have a material impact to its consolidated financial statements.

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, as recently amended, and will be required to be applied retrospectively. Early application of the guidance is permitted for annual reporting periods beginning after December 31, 2016. This guidance is applicable to the Company's fiscal year beginning June 1, 2017. The Company is currently evaluating this guidance and any potential impact to 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	2015		2014		2013
Basic earnings per share:
Net income	$	674.9	$	627.5	$	569.0
Weighted-average common shares outstanding	362.9		364.5		363.8
Basic earnings per share	$	1.86	$	1.72	$	1.56
Diluted earnings per share:
Net income	$	674.9	$	627.5	$	569.0
Weighted-average common shares outstanding	362.9		364.5		363.8
Dilutive effect of common share equivalents	1.7		1.6		0.9
Weighted-average common shares outstanding, assuming dilution	364.6		366.1		364.7
Diluted earnings per share	$	1.85	$	1.71	$	1.56
Weighted-average anti-dilutive common share equivalents	0.3		0.7		6.5

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

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In May 2014, the Company announced that its Board of Directors (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 2015, the Company repurchased 3.9 million shares for $182.4 million under this program. During fiscal 2014, the Company repurchased 6.2 million shares for $249.7 million under a previous Board-approved program to repurchase up to $350.0 million of its common stock which expired on May 31, 2014. All shares repurchased were retired.

Note C — Investment Income, Net

Investment income, net, consisted of the following items:

	Year ended May 31,
In millions	2015			2014			2013
Interest income on corporate funds	$	7.8		$	6.9		$	6.7
Interest expense	(0.7		)	(1.1		)	(0.1		)
Net loss from equity-method investments	(0.7		)	(0.4		)	—
Investment income, net	$	6.4		$	5.4		$	6.6

Note D — Stock-Based Compensation Plans

The Paychex, Inc. 2002 Stock Incentive Plan, as amended and restated, effective on October 13, 2010 (the “2002 Plan”) upon its approval by the Company’s stockholders, authorizes grants of up to 39.1 million shares of the Company’s common stock. As of May 31, 2015, there were 18.6 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 $31.4 million, $26.3 million, and $22.8 million for fiscal years 2015, 2014, and 2013, respectively. Related income tax benefits recognized were $11.7 million, $10.1 million, and $8.5 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, 2015, the total unrecognized compensation cost related to all unvested stock-based awards was $58.1 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 2015. The weighted-average assumptions used for valuation under the Black-Scholes model are as follows:

	Year ended May 31,
		2014			2013			2015			2014			2013
	Performance stock options							Stock options
Risk-free interest rate		1.5		%	0.7		%	2.1		%	2.0		%	1.0		%
Dividend yield		3.9		%	4.1		%	3.7		%	4.1		%	4.3		%
Volatility factor		.20			.22			.21			.22			.23
Expected option life in years		4.5			4.8			6.0			6.4			6.4
Weighted-average grant-date fair value of stock options granted (per share)		$	3.85		$	3.55		$	5.68		$	4.90		$	3.77

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.

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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, 2015:

In millions, except per share amounts	Shares subject to options		Weighted-average exercise price per share		Weighted-average remaining contractual term (years)	Aggregate  intrinsic value(1)
Outstanding as of May 31, 2014	5.4		$	34.00
Granted	0.8		$	41.70
Exercised	(1.5	)	$	33.84
Forfeited	—		$	30.15
Expired	—		$	38.12
Outstanding as of May 31, 2015	4.7		$	35.21	6.0	$	66.3
Exercisable as of May 31, 2015	2.7		$	33.42	4.4	$	43.0

⁽¹⁾ Market price of the underlying stock as of May 31, 2015 less the exercise price.

Other information pertaining to stock option grants is as follows:

	Year ended May 31,
In millions, except per share amounts	2015		2014		2013
Total intrinsic value of stock options exercised	$	17.6	$	18.9	$	7.8
Total grant-date fair value of stock options vested	$	3.6	$	3.0	$	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. In July 2014, 23.5% of the awards vested based on achievement against performance targets for fiscal 2014. The remaining awards will vest in full if performance targets for the fiscal year ending May 31, 2016 are achieved.

The following table summarizes performance stock option activity for the year ended May 31, 2015:

In millions, except per share amounts	Shares subject to options		Weighted-average exercise price per share		Weighted-average remaining contractual term (years)	Aggregate  intrinsic value(1)
Outstanding as of May 31, 2014	2.8		$	31.25
Granted	—		$	—
Exercised	(0.1	)	$	30.17
Forfeited	—		$	—
Expired	—		$	—
Outstanding as of May 31, 2015	2.7		$	31.31	6.4	$	48.2
Exercisable as of May 31, 2015	0.5		$	31.20	6.3	$	8.6

⁽¹⁾  Market price of the underlying stock as of May 31, 2015 less the exercise price.

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For fiscal 2015, the total intrinsic value of the performance stock options exercised was $2.7 million and the total grant-date fair value of performance stock options vested was $2.6 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, 2015:

In millions, except per share amounts	RSUs		Weighted-average grant-date fair value per share		Weighted-average remaining vesting period (years)	Aggregate  intrinsic value(1)
Nonvested as of May 31, 2014	1.7		$	30.52
Granted	0.7		$	36.64
Vested	(0.5	)	$	28.11
Forfeited	(0.1	)	$	32.60
Nonvested as of May 31, 2015	1.8		$	33.57	3.0	$	88.8

⁽¹⁾  Intrinsic value for RSUs is the market price of the underlying stock as of May 31, 2015.

Other information pertaining to RSUs is as follows:

	Year ended May 31,
In millions, except per share amounts	2015		2014		2013
Weighted-average grant-date fair value of RSUs granted	$	36.64	$	36.37	$	28.59
Total intrinsic value of RSUs vested	$	21.7	$	18.3	$	15.5
Total grant-date fair value of RSUs vested	$	14.8	$	12.1	$	13.4

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, 2015:

In millions, except per share amounts	Restricted shares		Weighted-average grant-date fair value per share
Nonvested as of May 31, 2014	0.2		$	33.55
Granted	0.1		$	41.70
Vested	(0.1	)	$	31.79
Forfeited	—		$	—
Nonvested as of May 31, 2015	0.2		$	38.99

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Other information pertaining to restricted stock follows:

	Year ended May 31,
In millions, except per share amounts	2015		2014		2013
Weighted-average grant-date fair value of restricted stock granted	$	41.70	$	38.53	$	31.76
Total grant-date fair value of restricted stock vested	$	3.5	$	3.3	$	2.1

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, 2015:

In millions, except per share amounts	Performance shares		Weighted-average grant-date fair value per share
Nonvested as of May 31, 2014	0.5		$	31.61
Granted (1)	0.2		$	37.61
Vested	(0.1	)	$	28.87
Forfeited	—		$	—
Nonvested as of May 31, 2015	0.6		$	34.24

⁽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:  The Company offers an Employee Stock Purchase Plan to all employees under which the Company’s common stock can be purchased through a payroll deduction with no discount to the market price and no look-back provision. All transactions occur directly through the Company’s transfer agent and no brokerage fees are charged to employees, except for when stock is sold. The plan has been deemed non-compensatory and therefore, no stock-based compensation costs have been recognized for fiscal years 2015, 2014, or 2013 related to this plan.

Note E — Funds Held for Clients and Corporate Investments

Funds held for clients and corporate investments are as follows:

	May 31, 2015
In millions	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair 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

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	May 31, 2014
In millions	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Type of issue:
Funds held for clients money market securities and other cash equivalents	$	1,579.2	$	—	$	—		$	1,579.2
Available-for-sale securities:
General obligation municipal bonds	1,605.4		25.0		(1.9		)	1,628.5
Pre-refunded municipal bonds(1)	140.4		2.4		—			142.8
Revenue municipal bonds	858.8		10.1		(1.1		)	867.8
Variable rate demand notes	752.3		—		—			752.3
Total available-for-sale securities	3,356.9		37.5		(3.0		)	3,391.4
Other	10.6		1.7		—			12.3
Total funds held for clients and corporate investments	$	4,946.7	$	39.2	$	(3.0	)	$	4,982.9

⁽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, 2015 and May 31, 2014 are 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	2015		2014
Funds held for clients	$	4,273.4	$	4,198.6
Corporate investments	366.6		398.7
Long-term corporate investments	399.8		385.6
Total funds held for clients and corporate investments	$	5,039.8	$	4,982.9

The Company’s available-for-sale securities reflected a net unrealized gain of $13.6 million as of May 31, 2015 compared with a net unrealized gain of $34.5 million as of May 31, 2014. Included in the net unrealized gain total as of May 31, 2015 and May 31, 2014, there were 280 and 98 available-for-sale securities, respectively, in an unrealized loss position. The securities in an unrealized loss position were as follows:

	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
In millions	Gross unrealized losses			Fair value		Gross unrealized losses			Fair Value		Gross unrealized losses			Fair 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

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	May 31, 2014
	Securities in an unrealized loss position for less than twelve months					Securities in an unrealized loss position for more than twelve months					Total
In millions	Gross unrealized losses			Fair value		Gross unrealized losses			Fair Value		Gross unrealized losses			Fair Value
Type of issue:
General obligation municipal bonds	$	(0.1	)	$	69.6	$	(1.8	)	$	164.0	$	(1.9	)	$	233.6
Pre-refunded municipal bonds	—			1.7		—			—		—			1.7
Revenue municipal bonds	—			47.5		(1.1		)	112.4		(1.1		)	159.9
Total	$	(0.1	)	$	118.8	$	(2.9	)	$	276.4	$	(3.0	)	$	395.2

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, 2015 that had unrealized losses of $7.5 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 substantial portion of the securities in an unrealized loss position as of May 31, 2015 and May 31, 2014 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	2015		2014		2013
Gross realized gains	$	0.3	$	0.6	$	0.9
Gross realized losses	—		—		—
Net realized gains	$	0.3	$	0.6	$	0.9

The amortized cost and fair value of available-for-sale securities that had stated maturities as of May 31, 2015 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, 2015
In millions	Amortized cost		Fair value
Maturity date:
Due in one year or less	$	345.8	$	347.8
Due after one year through three years	726.3		734.3
Due after three years through five years	800.9		802.0
Due after five years	1,709.0		1,711.5
Total	$	3,582.0	$	3,595.6

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 F — 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.

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• 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:

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

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

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

◦ 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, including money market securities, 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, 2015
In millions	Carrying value (Fair value)		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (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	$	—	$	—

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	May 31, 2014
In millions	Carrying value (Fair value)		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Assets:
Cash equivalents:
Commercial paper	$	6.0	$	—	$	6.0	$	—
General obligation municipal bonds	10.9		—		10.9		—
Pre-refunded municipal bonds	31.2		—		31.2		—
Revenue municipal bonds	17.7		—		17.7		—
Total cash equivalents	$	65.8	$	—	$	65.8	$	—
Available-for-sale securities:
General obligation municipal bonds	$	1,628.5	$	—	$	1,628.5	$	—
Pre-refunded municipal bonds	142.8		—		142.8		—
Revenue municipal bonds	867.8		—		867.8		—
Variable rate demand notes	752.3		—		752.3		—
Total available-for-sale securities	$	3,391.4	$	—	$	3,391.4	$	—
Other	$	12.3	$	12.3	$	—	$	—
Liabilities:
Other long-term liabilities	$	12.3	$	12.3	$	—	$	—

In determining the fair value of its assets and liabilities, the Company predominately uses the market approach. Commercial paper is included in Level 2 because it may not trade on a daily basis. Available-for-sale securities and short-term municipal securities 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 investments, 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 reviews the values generated by the independent pricing service for reasonableness by comparing the valuations received from the independent pricing service to valuations from at least one other observable source for a sample of securities. The Company has not adjusted the prices obtained from the independent pricing service.

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.

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Note G — Property and Equipment, Net of Accumulated Depreciation

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

	May 31,
In millions	2015		2014
Land and improvements	$	8.3	$	8.1
Buildings and improvements	102.1		101.1
Data processing equipment	190.9		180.8
Software	391.8		344.8
Furniture, fixtures, and equipment	145.6		145.0
Leasehold improvements	106.2		101.7
Construction in progress	28.5		25.3
Total property and equipment, gross	973.4		906.8
Less: Accumulated depreciation	619.5		564.6
Property and equipment, net of accumulated depreciation	$	353.9	$	342.2

Depreciation expense was $92.1 million, $89.1 million, and $79.2 million for fiscal years 2015, 2014, and 2013, respectively.

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

The Company had goodwill balances on its Consolidated Balance Sheets of $561.5 million as of May 31, 2015, and $540.3 million as of May 31, 2014. The increase in goodwill since May 31, 2014 was the result of an immaterial business acquisition.

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

	May 31,
In millions	2015		2014
Client lists	$	244.6	$	240.9
Other intangible assets	3.2		2.6
Total intangible assets, gross	247.8		243.5
Less: Accumulated amortization	215.4		202.9
Intangible assets, net of accumulated amortization	$	32.4	$	40.6

During fiscal 2015, the Company acquired intangible assets with weighted-average amortization periods as follows: customer lists — 8.0 years; other intangible assets — 3.0 years; and total — 7.6 years. Amortization expense relating to intangible assets was $14.5 million, $15.9 million, and $19.0 million for fiscal years 2015, 2014, and 2013, respectively.

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

In millions Year ending May 31,	Estimated amortization  expense
2016	$	11.3
2017	8.2
2018	5.5
2019	3.6
2020	2.0

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Note I — Income Taxes

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

	May 31,
In millions	2015			2014
Deferred tax assets:
Compensation and employee benefit liabilities	$	20.9		$	18.7
Other current liabilities	6.9			6.9
Tax credit carry forward	40.1			38.3
Depreciation	11.9			8.3
Stock-based compensation	21.6			21.1
Other	24.9			28.7
Gross deferred tax assets	126.3			122.0
Deferred tax liabilities:
Capitalized software	53.6			50.1
Depreciation	3.8			12.2
Goodwill and Intangible assets	52.0			46.7
Revenue not subject to current taxes	13.1			12.6
Unrealized gains on available-for-sale securities	5.3			13.2
Other	0.3			0.4
Gross deferred tax liabilities	128.1			135.2
Net deferred tax liability	$	(1.8	)	$	(13.2	)

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	2015			2014			2013
Current:
Federal	$	341.4		$	314.5		$	274.2
State	47.8			51.0			62.9
Total current	389.2			365.5			337.1
Deferred:
Federal	(5.1		)	(3.5		)	5.5
State	1.0			(1.4		)	(0.2		)
Total deferred	(4.1		)	(4.9		)	5.3
Income taxes	$	385.1		$	360.6		$	342.4

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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,
	2015		2014		2013
Federal statutory tax rate	35.0	%	35.0	%	35.0	%
Increase/(decrease) resulting from:
State income taxes, net of federal tax benefit	3.0	%	3.3	%	3.0	%
Tax settlement	—	%	—	%	1.5	%
Tax-exempt municipal bond interest	(1.5	)%	(1.5	)%	(1.7	)%
Other items	(0.2	)%	(0.3	)%	(0.2	)%
Effective income tax rate	36.3	%	36.5	%	37.6	%

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, 2015 and May 31, 2014, the total reserve for uncertain tax positions, including interest and net of federal benefits, was $29.1 million and $29.8 million, respectively. As of May 31, 2015 and May 31, 2014, $29.1 million and $28.6 million, respectively, of the total reserves for uncertain tax positions, including interest and net of federal benefits, 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	2015			2014			2013
Balance as of beginning of fiscal year	$	40.0		$	26.7		$	41.7
Additions for tax positions of the current year	6.7			11.2			28.5
Additions for tax positions of prior years	0.8			4.2			12.2
Reductions for tax positions of prior years	(0.4		)	(1.8		)	(0.5		)
Settlements with tax authorities	(1.2		)	—			(55.0		)
Expiration of the statute of limitations	(6.0		)	(0.3		)	(0.2		)
Balance as of end of fiscal year	$	39.9		$	40.0		$	26.7

In May 2013, the Company executed a closing agreement that resolved tax matters related to the audits by New York State for the fiscal year ended May 31, 2004 (“fiscal 2004”) through the fiscal year ended May 31, 2011 (“fiscal 2011”). As a result, the reserve for uncertain tax positions was increased by $21.2 million in May 2013. The resolution and execution of the closing agreement in May 2013 on the open tax matters for fiscal 2004 through fiscal 2011 impacted the Company's effective income tax rate for fiscal 2013, as noted in the reconciliation of the U.S. federal statutory rate to the Company's effective income tax rate.

The reserve as of May 31, 2015 substantially relates to uncertain tax positions for state income tax matters. The Company believes the reserve for uncertain tax positions, including interest and net of federal benefits, of $29.1 million as of May 31, 2015 adequately covers open tax years and uncertain tax positions up to and including fiscal 2015 for major taxing jurisdictions. As of May 31, 2015, the entire $29.1 million of unrecognized tax benefits, if recognized, would impact the Company’s effective income tax rate. As of May 31, 2014, $24.6 million of the $29.8 million unrecognized tax benefits, if recognized, would have impacted 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 2013 is currently under audit by the IRS and fiscal years 2012, 2014, and 2015 are subject to potential audit. With limited exception, state income tax audits by taxing authorities are closed through the fiscal year ended May 31, 2010, 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 2015, 2014, and 2013 was immaterial to the Company’s results of operations.

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Note J — 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	2015			2014			2013
Beginning balance	$	21.5		$	22.0		$	37.7
Other comprehensive loss:
Unrealized holding (losses)/gains	(21.5		)	0.3			(24.1		)
Income tax benefit/(expense) related to unrealized holding gains/(losses)	7.7			(0.4		)	9.0
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income	(0.3		)	(0.6		)	(0.9		)
Income tax expense on reclassification adjustment for the net gain on sale of available-for-sale securities	0.1			0.2			0.3
Total other comprehensive loss, net of tax	(14.0		)	(0.5		)	(15.7		)
Ending balance	$	7.5		$	21.5		$	22.0
Total tax (benefit)/expense included in other comprehensive loss	$	(7.8	)	$	0.2		$	(9.3	)

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 K — Supplemental Cash Flow Information

Income taxes paid were $372.8 million, $317.8 million, and $371.0 million for fiscal years 2015, 2014, and 2013, respectively.

Lease incentives received in the form of tenant allowances and free rent were $8.5 million, $6.7 million, and $6.4 million for fiscal years 2015, 2014, and 2013, respectively.

Note L — 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 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 2015, 2014, and 2013 were $19.6 million, $16.4 million, and $13.1 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 $14.2 million and $12.3 million as of May 31, 2015 and May 31, 2014, respectively, and are reflected in other long-term liabilities on the accompanying Consolidated Balance Sheets.

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Note M — Commitments and Contingencies

Lines of credit:  As of May 31, 2015, 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 28, 2016
Bank of America, N.A.	$250 million	February 28, 2016
PNC Bank, National Association	$150 million	February 28, 2016
Wells Fargo Bank, National Association	$150 million	February 28, 2016

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 2015 or as of May 31, 2015.

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 facility: In June 2013, the Company entered into a committed, unsecured, five-year syndicated credit facility, expiring on June 21, 2018. Under the credit facility, Paychex of New York LLP (the “Borrower”) may, subject to certain restrictions, borrow up to $750 million to meet short-term funding requirements. In July 2014, a supplemental agreements were executed increasing the maximum borrowing capacity under the facility from $500 million to $750 million. 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 June 2018, any borrowings outstanding will mature and be payable on such date.

There were no amounts outstanding under this credit facility as of May 31, 2015. During fiscal 2015, the Company borrowed against this facility, for one day each, as follows:

$ in millions Fiscal quarter	Amount borrowed		Interest rate
First quarter	$	100.0	3.25	%
Second quarter	$	150.0	3.25	%
Third quarter	$	—	—
Fourth quarter	$	—	—

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.

Letters of credit:  The Company had irrevocable standby letters of credit outstanding totaling $43.0 million both as of May 31, 2015 and May 31, 2014, required to secure commitments for certain insurance policies. The letters of credit expire at various dates between July 2015 and April 2016, and are collateralized by securities held in the Company’s investment portfolios. No amounts were outstanding on these letters of credit during fiscal 2015 or as of May 31, 2015. Subsequent to May 31, 2015, the letter of credit expiring in July 2015 was renewed through July 2016.

55

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 2015, 2014, and 2013 was $39.4 million, $39.1 million, and $39.9 million, respectively. As of May 31, 2015, future minimum lease payments under various non-cancelable operating leases with terms of more than one year are as follows:

In millions Year ending May 31,	Minimum lease  payments
2016	$	37.5
2017	31.2
2018	23.1
2019	16.1
2020	11.3
Thereafter	8.5

Other commitments:    As of May 31, 2015, the Company had outstanding commitments under purchase orders and legally binding contractual arrangements with minimum future payment obligations of approximately $104.8 million, including $9.5 million of commitments to purchase capital assets. These minimum future payment obligations relate to the following fiscal years:

In millions Year ending May 31,	Minimum payment  obligation
2016	$	71.2
2017	26.8
2018	4.4
2019	1.9
2020	0.3
Thereafter	0.2

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 N — Related Parties

During fiscal years 2015, 2014, and 2013, the Company purchased approximately $6.9 million, $4.7 million, and $6.5 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 2015, 2014, and 2013, the Company purchased approximately $1.7 million, $1.3 million, and $1.6 million, respectively, of office supplies from Staples, Inc. The Vice Chairman of Staples, Inc. is a member of the Company’s Board.

56

Note O — Quarterly Financial Data (Unaudited)

In millions, except per share amounts

	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

	Three Months Ended
Fiscal 2014	August 31		November 30		February 28		May 31		Full Year
Service revenue (3)	$	603.1	$	606.4	$	639.9	$	628.8	$	2,478.2
Interest on funds held for clients	10.0		10.0		10.5		10.2		40.7
Total revenue (3)	$	613.1	$	616.4	$	650.4	$	639.0	$	2,518.9
Operating income	$	255.1	$	248.6	$	250.7	$	228.3	$	982.7
Investment income, net	1.2		1.3		1.5		1.4		5.4
Income before income taxes	256.3		249.9		252.2		229.7		988.1
Income taxes	93.5		91.2		92.1		83.8		360.6
Net income	$	162.8	$	158.7	$	160.1	$	145.9	$	627.5
Basic earnings per share(1)	$	0.45	$	0.43	$	0.44	$	0.40	$	1.72
Diluted earnings per share(1)	$	0.44	$	0.43	$	0.44	$	0.40	$	1.71
Weighted-average common shares outstanding	365.3		364.9		364.2		363.5		364.5
Weighted-average common shares outstanding, assuming dilution	366.7		366.4		365.8		365.3		366.1
Cash dividends per common share	$	0.35	$	0.35	$	0.35	$	0.35	$	1.40
Total net realized gains(2)	$	0.2	$	—	$	0.3	$	0.1	$	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.

⁽³⁾  With the introduction of the new health insurance offering within the PEO during fiscal 2014, the Company began classifying PEO direct costs related to certain benefit plans where the Company retains risk as operating expenses rather than as a reduction in service revenue. As a result, the amounts reported for service revenue and total revenue for the first through third quarters of fiscal 2014 differ from that reported in the Company's Quarterly Reports on Form 10-Q (“Form 10-Q”). There was no impact to operating income from this change. The correction for the PEO direct cost adjustment was not material to any prior interim period in fiscal 2014. Service revenue, as reported in the Company's Form 10-Qs was $597.9 million, $600.5 million, and $626.0 million for the first, second, and third fiscal quarters of fiscal 2014, respectively. Total revenue, as reported in the Company's Form 10-Qs was $607.9 million, $610.5 million, and $636.5 million for the first, second, and third fiscal quarters of fiscal 2014, respectively.

57

Schedule II — Valuation and Qualifying Accounts

PAYCHEX, INC.

CONSOLIDATED FINANCIAL STATEMENT SCHEDULE

FOR THE YEAR ENDED MAY 31,

(In millions)

Description	Balance as  of beginning of fiscal year		Additions charged to expenses		Additions to/(Deductions from) other accounts(1)			Costs and   deductions(2)		Balance as of end of fiscal year
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
2013
Allowance for doubtful accounts	$	1.2	$	1.7	$	—		$	1.9	$	1.0
Reserve for client fund losses	$	2.1	$	2.7	$	—		$	2.4	$	2.4

⁽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 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, 2015, the end of the period covered by this report, the Company’s disclosure controls and procedures were effective.

Changes in Internal Controls 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, 2015. Based on such evaluation, there have been no changes in the Company’s internal controls over financial reporting that occurred during the Company’s most recently completed fiscal quarter ended May 31, 2015, 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, 2015, 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	55	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	58	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	54	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	49	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	57	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	45	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	52	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	50	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 2015 Annual Meeting of Stockholders, anticipated to be held on or about October 14, 2015, in the sections “PROPOSAL 1 — ELECTION OF DIRECTORS FOR A ONE-YEAR TERM,” “CORPORATE GOVERNANCE,” “SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE,” 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 2015 Annual Meeting of Stockholders, anticipated to be held on or about October 14, 2015, in the sections “COMPENSATION DISCUSSION AND ANALYSIS,” “NAMED EXECUTIVE OFFICER COMPENSATION,” and “DIRECTOR COMPENSATION FOR THE FISCAL YEAR ENDED MAY 31, 2015,” 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 below and in the Company’s Definitive Proxy Statement for its 2015 Annual Meeting of Stockholders, anticipated to be held on or about October 14, 2015, under the section “BENEFICIAL OWNERSHIP OF PAYCHEX COMMON STOCK,” and under “Equity Compensation Plan Information” within “PROPOSAL 3 - TO APPROVE AND AMEND THE PAYCHEX, INC. 2002 STOCK INCENTIVE PLAN, INCLUDING AN INCREASE IN THE SHARES AVAILABLE UNDER THE PLAN,” 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 2015 Annual Meeting of Stockholders, anticipated to be held on or about October 14, 2015, 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 2015 Annual Meeting of Stockholders, anticipated to be held on or about October 14, 2015, under the section “PROPOSAL 5 — 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. 2002 Stock Incentive Plan (as amended and restated effective October 13, 2010), incorporated herein by reference from Exhibit 4.1 to the Company’s Registration Statement on Form S-8, No. 333-170871.
#	(10.2)	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.
#	(10.3)	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.
#	(10.4)	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.
#	(10.5)	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.
#	(10.6)	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.
#	(10.7)	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.
#	(10.8)	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.
#	(10.9)	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.
#	(10.10)	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.
#	(10.11)	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.
#	(10.12)	Paychex, Inc. 2002 Stock Incentive Plan (as amended and restated effective October 13, 2010) Form of Restricted Stock Unit (Special Retention) Award Agreement, incorporated herein by reference from Exhibit 10.22 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. 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.
#	(10.15)	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.
#	(10.16)	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.
#	(10.17)	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.
#	(10.18)	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.
	(10.19)	Stock Purchase Plan Engagement Agreement between Paychex, Inc. and JP Morgan Securities LLC, dated as of March 26, 2013, incorporated herein by reference from Exhibit 10.1 to the Company’s Form 8-K filed with the Commission on March 29, 2013.
*	(21.1)	Subsidiaries of the Registrant.
*	(23.1)	Consent of Independent Registered Public Accounting Firm, PricewaterhouseCoopers LLP.
*	(23.2)	Consent of Independent Registered Public Accounting Firm, Ernst & Young 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 21, 2015.

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 21, 2015.

/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-21

EXHIBIT 21.1

SUBSIDIARIES OF THE REGISTRANT

SUBSIDIARIES OF PAYCHEX, INC. AS OF MAY 31, 2015

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 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, that would not constitute a significant subsidiary, per Regulation S-X, Article 1, as of May 31, 2015, 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 and 333-170871 of Paychex, Inc. of our reportdated July 21, 2015 relating to the financial statements, financial statement scheduleand the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.

/s/ PricewaterhouseCoopers LLP

Rochester, New York

July 21, 2015

EX-23.2

EXHIBIT 23.2    

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statement (Form S-8 No. 333-84055) pertaining to the Paychex, Inc. 401(k) Incentive Retirement Plan, and

(2) Registration Statement (Form S-8 No. 333-170871) pertaining to the Paychex, Inc. 2002 Stock Incentive Plan, as amended and restated effective October 13, 2010;

of our report dated July 22, 2013, with respect to the consolidated financial statements and schedule of Paychex, Inc. for the year ended May 31, 2013 included in this Annual Report (Form 10-K) of Paychex, Inc. for the year ended May 31, 2015.

/s/ Ernst & Young LLP

Rochester, New York

July 21, 2015

EX-24

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, 2015, 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:	July 8, 2015	/s/ B. Thomas Golisano
		B. Thomas Golisano
Dated:	July 8, 2015	/s/ Joseph G. Doody
		Joseph G. Doody
Dated:	July 8, 2015	/s/ David J. S. Flaschen
		David J. S. Flaschen
Dated:	July 8, 2015	/s/ Phillip Horsley
		Phillip Horsley
Dated:	July 8, 2015	/s/ Grant M. Inman
		Grant M. Inman
Dated:	July 8, 2015	/s/ Pamela A. Joseph
		Pamela A. Joseph
Dated:	July 8, 2015	/s/ Joseph M. Tucci
		Joseph M. Tucci
Dated:	July 8, 2015	/s/ Joseph M. Velli
		Joseph M. 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 21, 2015/s/ Martin Mucci          

President and Chief 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 21, 2015/s/ Efrain Rivera                

Senior Vice President, Chief Financial 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, 2015 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 21, 2015

_/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, 2015 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 21, 2015

/s/ Efrain Rivera                

Efrain Rivera

Senior Vice President, Chief Financial Officer, and Treasurer

XML

Stock-Based Compensation Plans (Details) - $ / shares	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Performance Stock Options [Member]
Weighted-average assumptions used for valuation under the Black-Scholes model
Risk-free interest rate		1.50%	0.70%
Dividend yield		3.90%	4.10%
Volatility factor		20.00%	22.00%
Expected option life in years		4 years 6 months	4 years 9 months 18 days
Weighted-average grant-date fair value of stock options granted (per share)		$ 3.85	$ 3.55
Employee Stock Option [Member]
Weighted-average assumptions used for valuation under the Black-Scholes model
Risk-free interest rate	2.10%	2.00%	1.00%
Dividend yield	3.70%	4.10%	4.30%
Volatility factor	21.00%	22.00%	23.00%
Expected option life in years	6 years	6 years 4 months 24 days	6 years 4 months 24 days
Weighted-average grant-date fair value of stock options granted (per share)	$ 5.68	$ 4.90	$ 3.77

XML

Goodwill and Intangible Assets, Net of Accumulated Amortization (Details) - USD ($) $ in Millions	May. 31, 2015	May. 31, 2014
Components of intangible assets, at cost
Client lists	$ 244.6	$ 240.9
Other intangible assets	3.2	2.6
Total intangible assets, gross	247.8	243.5
Less: Accumulated amortization	215.4	202.9
Intangible assets, net of accumulated amortization	32.4	$ 40.6
Estimated future amortization expense relating to intangible assets
Fiscal year ending May 31, 2016	11.3
Fiscal year ending May 31, 2017	8.2
Fiscal year ending May 31, 2018	5.5
Fiscal year ending May 31, 2019	3.6
Fiscal year ending May 31, 2020	$ 2.0

XML

Stock-Based Compensation Plans (Details Textuals) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Stock Based Compensation Plans (Textual) [Abstract]
Number of shares authorized for issuance under stock plan	39.1
Shares available for future grants	18.6
Stock-based compensation expense	$ 31.4	$ 26.3	$ 22.8
Income tax benefits related to stock-based compensation	11.7	$ 10.1	$ 8.5
Total unrecognized compensation costs related to all unvested stock-based awards	$ 58.1
Weighted-average period in years of all unvested stock-based awards	2 years 10 months 25 days
Contractual life of stock option grants	10 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, Ending balance, Shares	4.7	5.4
Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, Ending balance, Shares	2.7	2.8
Director [Member] | Employee Stock Option [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
Officer [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Officer [Member] | Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Achievement of performance targets for fiscal 2014	23.50%
Officer [Member] | Unearned Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period for unearned performance shares	2 years
Vesting period	1 year
Officer [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.00%
Management [Member] | Restricted Stock Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	20.00%
Vesting period	5 years

XML

Quarterly Financial Data (Unaudited) - Additional Disclosures (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May. 31, 2015	May. 31, 2014	May. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Service revenue	$ 681.4	$ 693.6	$ 665.9	$ 656.6	$ 628.8	$ 639.9	$ 606.4	$ 603.1	$ 2,697.5	$ 2,478.2	$ 2,285.2
Total revenue	$ 692.2	704.3	676.3	666.8	$ 639.0	$ 650.4	$ 616.4	$ 613.1	$ 2,739.6	$ 2,518.9	$ 2,326.2
Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Service revenue		626.0	600.5	597.9
Total revenue		$ 636.5	$ 610.5	$ 607.9

XML

Goodwill and Intangible Assets, Net of Accumulated Amortization (Details Textual) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Goodwill and Intangible Assets, Net of Accumulated Amortization (Textual)
Goodwill	$ 561.5	$ 540.3
Amortization expense relating to intangible assets	$ 14.5	$ 15.9	$ 19.0
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, Weighted average amortization period	7 years 7 months 6 days
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, Weighted average amortization period	8 years
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, Weighted average amortization period	3 years

XML

Stock-Based Compensation Plans (Details 7) - Restricted Stock [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Nonvested/unearned shares, other information
Granted, Weighted-average grant-date fair value per share	$ 41.70	$ 38.53	$ 31.76
Total grant-date fair value of restricted stock vested	$ 3.5	$ 3.3	$ 2.1

XML

Commitments and Contingencies (Tables)

12 Months Ended

May. 31, 2015

Line of Credit Facility [Line Items]

Summary of future minimum lease payments under various non-cancelable operating leases

As of May 31, 2015, future minimum lease payments under various non-cancelable operating leases with terms of more than one year are as follows:

In millions Year ending May 31,	Minimum lease  payments
2016	$	37.5
2017	31.2
2018	23.1
2019	16.1
2020	11.3
Thereafter	8.5

Summary of minimum future payment obligations

These minimum future payment obligations relate to the following fiscal years:

In millions Year ending May 31,	Minimum payment  obligation
2016	$	71.2
2017	26.8
2018	4.4
2019	1.9
2020	0.3
Thereafter	0.2

Line of Credit [Member]

Line of Credit Facility [Line Items]

Lines of credit facility unused borrowing capacity or amount borrowed and interest rate

As of May 31, 2015, 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 28, 2016
Bank of America, N.A.	$250 million	February 28, 2016
PNC Bank, National Association	$150 million	February 28, 2016
Wells Fargo Bank, National Association	$150 million	February 28, 2016

Revolving Credit Facility [Member]

Line of Credit Facility [Line Items]

Lines of credit facility unused borrowing capacity or amount borrowed and interest rate

There were no amounts outstanding under this credit facility as of May 31, 2015. During fiscal 2015, the Company borrowed against this facility, for one day each, as follows:

$ in millions Fiscal quarter	Amount borrowed		Interest rate
First quarter	$	100.0	3.25	%
Second quarter	$	150.0	3.25	%
Third quarter	$	—	—
Fourth quarter	$	—	—

XML

Income Taxes (Details 1) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May. 31, 2015	May. 31, 2014	May. 31, 2013
Current:
Federal									$ 341.4	$ 314.5	$ 274.2
State									47.8	51.0	62.9
Total current									389.2	365.5	337.1
Deferred:
Federal									(5.1)	(3.5)	5.5
State									1.0	(1.4)	(0.2)
Total deferred									(4.1)	(4.9)	5.3
Income taxes	$ 92.4	$ 96.5	$ 98.6	$ 97.6	$ 83.8	$ 92.1	$ 91.2	$ 93.5	$ 385.1	$ 360.6	$ 342.4

XML

Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of beginning of fiscal year	$ 1.5	$ 1.0	$ 1.2
Additions charged to expenses	1.6	2.5	1.7
Additions to/(deductions from) other accounts	0.1	0.0	0.0
Costs and deductions	1.8	2.0	1.9
Balance as of end of fiscal year	1.4	1.5	1.0
Reserve For Client Fund Losses [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of beginning of fiscal year	1.9	2.4	2.1
Additions charged to expenses	2.0	2.2	2.7
Additions to/(deductions from) other accounts	(0.2)	0.0	0.0
Costs and deductions	1.9	2.7	2.4
Balance as of end of fiscal year	$ 1.8	$ 1.9	$ 2.4

XML

Investment Income, Net (Tables)

12 Months Ended

May. 31, 2015

Investment Income, Net [Abstract]

Schedule of Investment Income, Net

Investment income, net, consisted of the following items:

	Year ended May 31,
In millions	2015			2014			2013
Interest income on corporate funds	$	7.8		$	6.9		$	6.7
Interest expense	(0.7		)	(1.1		)	(0.1		)
Net loss from equity-method investments	(0.7		)	(0.4		)	—
Investment income, net	$	6.4		$	5.4		$	6.6

XML

Funds Held for Clients and Corporate Investments (Details 1) - USD ($) $ in Millions	May. 31, 2015	May. 31, 2014
Classification of investments on the Consolidated Balance Sheets
Funds held for clients	$ 4,273.4	$ 4,198.6
Corporate investments	366.6	398.7
Long-term corporate investments	399.8	385.6
Total funds held for clients and corporate investments, Fair value	5,039.8	4,982.9
Securities in an unrealized loss position
Less than twelve months, Gross unrealized losses	(7.0)	(0.1)
Less than twelve months, Fair value	896.7	118.8
Twelve months or longer, Gross unrealized losses	(0.5)	(2.9)
Twelve months or longer, Fair value	26.3	276.4
Total, Gross unrealized losses	(7.5)	(3.0)
Total, Fair value	923.0	395.2
General obligation municipal bonds [Member]
Securities in an unrealized loss position
Less than twelve months, Gross unrealized losses	(3.8)	(0.1)
Less than twelve months, Fair value	535.1	69.6
Twelve months or longer, Gross unrealized losses	(0.5)	(1.8)
Twelve months or longer, Fair value	26.3	164.0
Total, Gross unrealized losses	(4.3)	(1.9)
Total, Fair value	561.4	233.6
Pre-refunded municipal bonds [Member]
Securities in an unrealized loss position
Less than twelve months, Gross unrealized losses		0.0
Less than twelve months, Fair value		1.7
Twelve months or longer, Gross unrealized losses		0.0
Twelve months or longer, Fair value		0.0
Total, Gross unrealized losses		0.0
Total, Fair value		1.7
Revenue municipal bonds [Member]
Securities in an unrealized loss position
Less than twelve months, Gross unrealized losses	(3.2)	0.0
Less than twelve months, Fair value	361.6	47.5
Twelve months or longer, Gross unrealized losses	0.0	(1.1)
Twelve months or longer, Fair value	0.0	112.4
Total, Gross unrealized losses	(3.2)	(1.1)
Total, Fair value	$ 361.6	$ 159.9

XML

Stock-Based Compensation Plans (Details 3) - Performance Stock Options [Member] - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	May. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of stock options exercised	$ 2.7
Total grant-date fair value of stock options vested	$ 2.6
Performance stock option activity [Roll Forward]
Options outstanding, Beginning balance, Shares	2.8
Options outstanding, Beginning balance, Weighted-average exercise price per share	$ 31.25
Options granted	0.0
Options granted, Weighted-average exercise price per share	$ 0.00
Options exercised	(0.1)
Options exercised, Weighted-average exercise price per share	$ 30.17
Options forfeited	0.0
Options forfeited, Weighted-average exercise price per share	$ 0.00
Options expired	0.0
Options expired, Weighted-average exercise price per share	$ 0.00
Options outstanding, Ending balance, Shares	2.7
Options outstanding, Ending balance, Weighted-average exercise price per share	$ 31.31
Options outstanding, Ending balance, Weighted-average remaining contractual term	6 years 4 months 24 days
Options outstanding, Ending balance, Aggregate intrinsic value	$ 48.2
Options exercisable, Ending balance, Shares	0.5
Options exercisable, Ending balance, Weighted-average exercise price per share	$ 31.20
Options exercisable, Ending balance, Weighted-average remaining contractual term	6 years 3 months 18 days
Options exercisable, Ending balance, Aggregate intrinsic value	$ 8.6

XML

Basic and Diluted Earnings Per Share Basic and Diluted Earnings Per Share (Details Textual) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	Oct. 31, 2012
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 182.4	$ 249.7
Share Repurchase Program 1 [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Shares		6.2
Share Repurchase Program, Authorized Amount			$ 350.0
Stock Repurchased and Retired During Period, Value		$ 249.7
Share Repurchase Program 2 [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Shares	3.9
Share Repurchase Program, Authorized Amount		$ 350.0
Stock Repurchased and Retired During Period, Value	$ 182.4

XML

Fair Value Measurements (Details) - USD ($) $ in Millions		May. 31, 2015	May. 31, 2014
Available-for-sale securities:
Available-for-sale securities		$ 3,595.6	$ 3,391.4
Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		103.1	65.8
Available-for-sale securities:
Available-for-sale securities		3,595.6	3,391.4
Other		14.2	12.3
Liabilities:
Other long-term liabilities		14.2	12.3
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		15.0	6.0
General obligation municipal bonds [Member]
Available-for-sale securities:
Available-for-sale securities		1,703.7	1,628.5
General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		55.1	10.9
Available-for-sale securities:
Available-for-sale securities		1,703.7	1,628.5
Pre-refunded municipal bonds [Member]
Available-for-sale securities:
Available-for-sale securities	[1]	102.7	142.8
Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		20.5	31.2
Available-for-sale securities:
Available-for-sale securities		102.7	142.8
Revenue municipal bonds [Member]
Available-for-sale securities:
Available-for-sale securities		963.6	867.8
Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		12.3	17.7
Available-for-sale securities:
Available-for-sale securities		963.6	867.8
Money market securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.2
Variable Rate Demand Obligation [Member]
Available-for-sale securities:
Available-for-sale securities		825.6	752.3
Variable Rate Demand Obligation [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale securities:
Available-for-sale securities		825.6	752.3
Quoted prices in active markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.2	0.0
Available-for-sale securities:
Available-for-sale securities		0.0	0.0
Other		14.2	12.3
Liabilities:
Other long-term liabilities		14.2	12.3
Quoted prices in active markets (Level 1) [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.0	0.0
Quoted prices in active markets (Level 1) [Member] | General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.0	0.0
Available-for-sale securities:
Available-for-sale securities		0.0	0.0
Quoted prices in active markets (Level 1) [Member] | Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.0	0.0
Available-for-sale securities:
Available-for-sale securities		0.0	0.0
Quoted prices in active markets (Level 1) [Member] | Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.0	0.0
Available-for-sale securities:
Available-for-sale securities		0.0	0.0
Quoted prices in active markets (Level 1) [Member] | Money market securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.2
Quoted prices in active markets (Level 1) [Member] | Variable Rate Demand Obligation [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale securities:
Available-for-sale securities		0.0	0.0
Significant other observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		102.9	65.8
Available-for-sale securities:
Available-for-sale securities		3,595.6	3,391.4
Other		0.0	0.0
Liabilities:
Other long-term liabilities		0.0	0.0
Significant other observable Inputs (Level 2) [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		15.0	6.0
Significant other observable Inputs (Level 2) [Member] | General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		55.1	10.9
Available-for-sale securities:
Available-for-sale securities		1,703.7	1,628.5
Significant other observable Inputs (Level 2) [Member] | Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		20.5	31.2
Available-for-sale securities:
Available-for-sale securities		102.7	142.8
Significant other observable Inputs (Level 2) [Member] | Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		12.3	17.7
Available-for-sale securities:
Available-for-sale securities		963.6	867.8
Significant other observable Inputs (Level 2) [Member] | Money market securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.0
Significant other observable Inputs (Level 2) [Member] | Variable Rate Demand Obligation [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale securities:
Available-for-sale securities		825.6	752.3
Significant unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.0	0.0
Available-for-sale securities:
Available-for-sale securities		0.0	0.0
Other		0.0	0.0
Liabilities:
Other long-term liabilities		0.0	0.0
Significant unobservable Inputs (Level 3) [Member] | Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.0	0.0
Significant unobservable Inputs (Level 3) [Member] | General obligation municipal bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.0	0.0
Available-for-sale securities:
Available-for-sale securities		0.0	0.0
Significant unobservable Inputs (Level 3) [Member] | Pre-refunded municipal bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.0	0.0
Available-for-sale securities:
Available-for-sale securities		0.0	0.0
Significant unobservable Inputs (Level 3) [Member] | Revenue municipal bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.0	0.0
Available-for-sale securities:
Available-for-sale securities		0.0	0.0
Significant unobservable Inputs (Level 3) [Member] | Money market securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents		0.0
Significant unobservable Inputs (Level 3) [Member] | Variable Rate Demand Obligation [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale securities:
Available-for-sale securities		$ 0.0	$ 0.0

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

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Commitments and Contingencies (Details Textual) - USD ($)	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Commitments and Contingencies (Textual) [Abstract]
Rent expense	$ 39,400,000	$ 39,100,000	$ 39,900,000
Minimum future payment obligations under purchase orders and contractual arrangements	104,800,000
Commitments to purchase capital assets	9,500,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Amount outstanding	0
Standby Letters of Credit [Member]
Line of Credit Facility [Line Items]
Amount available	$ 43,000,000	43,000,000
Expiration date range of letters of credit	July 2015 and April 2016
Irrevocable stand by letters of credit amount outstanding	$ 0
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Amount outstanding	$ 0
Line of credit facility, initial term	5 years
Expiration date	Jun. 21, 2018
Maximum borrowing capacity	$ 750,000,000	$ 500,000,000

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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 21.5	$ 22.0	$ 37.7
Unrealized holding (losses)/gains	(21.5)	0.3	(24.1)
Income tax benefit/(expense)related to unrealized holding gains/(losses)	7.7	(0.4)	9.0
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income	(0.3)	(0.6)	(0.9)
Income tax expense on reclassification adjustment for the net gain on sale of available-for-sale securities	0.1	0.2	0.3
Total other comprehensive loss, net of tax	(14.0)	(0.5)	(15.7)
Ending balance	7.5	21.5	22.0
Total tax (benefit)/expense included in other comprehensive loss	$ (7.8)	$ 0.2	$ (9.3)

XML

Stock-Based Compensation Plans (Details 8) - Unearned Performance Shares [Member] - $ / shares shares in Millions	12 Months Ended
	May. 31, 2015
Unearned Performance Shares Activity [Roll Forward]
Nonvested/unearned shares, Beginning balance	0.5
Nonvested/unearned shares, Beginning balance, Weighted-average grant-date fair value per share	$ 31.61
Granted	0.2
Granted, Weighted-average grant-date fair value per share	$ 37.61
Vested	(0.1)
Vested, Weighted-average grant-date fair value per share	$ 28.87
Forfeited	0.0
Forfeited, Weighted-average grant-date fair value per share	$ 0.00
Nonvested/unearned shares, Ending balance	0.6
Nonvested/unearned shares, Ending balance, Weighted-average grant-date fair value per share	$ 34.24

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Investment Income, Net (Notes)

12 Months Ended

May. 31, 2015

Investment Income, Net [Abstract]

Investment Income, Net

Investment Income, Net

Investment income, net, consisted of the following items:

	Year ended May 31,
In millions	2015			2014			2013
Interest income on corporate funds	$	7.8		$	6.9		$	6.7
Interest expense	(0.7		)	(1.1		)	(0.1		)
Net loss from equity-method investments	(0.7		)	(0.4		)	—
Investment income, net	$	6.4		$	5.4		$	6.6

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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Supplemental Cash Flow Information [Abstract]
Income taxes paid	$ 372.8	$ 317.8	$ 371.0
Lease incentives received	$ 8.5	$ 6.7	$ 6.4

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Stock-Based Compensation Plans (Details 4) - Restricted Stock Unit [Member] - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
RSU Activity [Roll Forward]
Nonvested/unearned shares, Beginning balance	1.7
Nonvested/unearned shares, Beginning balance, Weighted-average grant-date fair value per share	$ 30.52
Granted	0.7
Granted, Weighted-average grant-date fair value per share	$ 36.64	$ 36.37	$ 28.59
Vested	(0.5)
Vested, Weighted-average grant-date fair value per share	$ 28.11
Forfeited	(0.1)
Forfeited, Weighted-average grant-date fair value per share	$ 32.60
Nonvested/unearned shares, Ending balance	1.8	1.7
Nonvested/unearned shares, Ending balance, Weighted-average grant-date fair value per share	$ 33.57	$ 30.52
Weighted-average remaining vesting period (years)	3 years
Aggregate intrinsic value, Ending balance	$ 88.8

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Property and Equipment, Net of Accumulated Depreciation (Tables)

12 Months Ended

May. 31, 2015

Property, Plant and Equipment [Abstract]

Components of property and equipment, at cost

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

	May 31,
In millions	2015		2014
Land and improvements	$	8.3	$	8.1
Buildings and improvements	102.1		101.1
Data processing equipment	190.9		180.8
Software	391.8		344.8
Furniture, fixtures, and equipment	145.6		145.0
Leasehold improvements	106.2		101.7
Construction in progress	28.5		25.3
Total property and equipment, gross	973.4		906.8
Less: Accumulated depreciation	619.5		564.6
Property and equipment, net of accumulated depreciation	$	353.9	$	342.2

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Fair Value Measurements (Tables)

12 Months Ended

May. 31, 2015

Fair Value Disclosures [Abstract]

Financial assets and liabilities measured 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, 2015
In millions	Carrying value (Fair value)		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (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	$	—	$	—

	May 31, 2014
In millions	Carrying value (Fair value)		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Assets:
Cash equivalents:
Commercial paper	$	6.0	$	—	$	6.0	$	—
General obligation municipal bonds	10.9		—		10.9		—
Pre-refunded municipal bonds	31.2		—		31.2		—
Revenue municipal bonds	17.7		—		17.7		—
Total cash equivalents	$	65.8	$	—	$	65.8	$	—
Available-for-sale securities:
General obligation municipal bonds	$	1,628.5	$	—	$	1,628.5	$	—
Pre-refunded municipal bonds	142.8		—		142.8		—
Revenue municipal bonds	867.8		—		867.8		—
Variable rate demand notes	752.3		—		752.3		—
Total available-for-sale securities	$	3,391.4	$	—	$	3,391.4	$	—
Other	$	12.3	$	12.3	$	—	$	—
Liabilities:
Other long-term liabilities	$	12.3	$	12.3	$	—	$	—

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Income Taxes (Details) - USD ($) $ in Millions	May. 31, 2015	May. 31, 2014
Deferred tax assets:
Compensation and employee benefit liabilities	$ 20.9	$ 18.7
Other current liabilities	6.9	6.9
Tax credit carry forward	40.1	38.3
Depreciation	11.9	8.3
Stock-based compensation	21.6	21.1
Other	24.9	28.7
Gross deferred tax assets	126.3	122.0
Deferred tax liabilities:
Capitalized software	53.6	50.1
Depreciation	3.8	12.2
Goodwill and Intangible assets	52.0	46.7
Revenue not subject to current taxes	13.1	12.6
Unrealized gains on available-for-sale securities	5.3	13.2
Other	0.3	0.4
Gross deferred tax liabilities	128.1	135.2
Net deferred tax liability	$ (1.8)	$ (13.2)

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Stock-Based Compensation Plans (Details 5) - Restricted Stock Unit [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
RSUs, other information
Weighted-average grant-date fair value for RSUs granted	$ 36.64	$ 36.37	$ 28.59
Total intrinsic value of RSUs vested	$ 21.7	$ 18.3	$ 15.5
Total grant-date fair value of RSUs vested	$ 14.8	$ 12.1	$ 13.4

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Goodwill and Intangible Assets, Net of Accumulated Amortization (Tables)

12 Months Ended

May. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Components of intangible assets, at cost

The components of intangible assets, at cost, consisted of the following:

	May 31,
In millions	2015		2014
Client lists	$	244.6	$	240.9
Other intangible assets	3.2		2.6
Total intangible assets, gross	247.8		243.5
Less: Accumulated amortization	215.4		202.9
Intangible assets, net of accumulated amortization	$	32.4	$	40.6

Estimated future amortization expense relating to intangible assets

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

In millions Year ending May 31,	Estimated amortization  expense
2016	$	11.3
2017	8.2
2018	5.5
2019	3.6
2020	2.0

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Income Taxes (Tables)

12 Months Ended

May. 31, 2015

Income Tax Disclosure [Abstract]

Components of deferred tax assets and liabilities

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

	May 31,
In millions	2015			2014
Deferred tax assets:
Compensation and employee benefit liabilities	$	20.9		$	18.7
Other current liabilities	6.9			6.9
Tax credit carry forward	40.1			38.3
Depreciation	11.9			8.3
Stock-based compensation	21.6			21.1
Other	24.9			28.7
Gross deferred tax assets	126.3			122.0
Deferred tax liabilities:
Capitalized software	53.6			50.1
Depreciation	3.8			12.2
Goodwill and Intangible assets	52.0			46.7
Revenue not subject to current taxes	13.1			12.6
Unrealized gains on available-for-sale securities	5.3			13.2
Other	0.3			0.4
Gross deferred tax liabilities	128.1			135.2
Net deferred tax liability	$	(1.8	)	$	(13.2	)

Components of provision for income taxes

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

	Year ended May 31,
In millions	2015			2014			2013
Current:
Federal	$	341.4		$	314.5		$	274.2
State	47.8			51.0			62.9
Total current	389.2			365.5			337.1
Deferred:
Federal	(5.1		)	(3.5		)	5.5
State	1.0			(1.4		)	(0.2		)
Total deferred	(4.1		)	(4.9		)	5.3
Income taxes	$	385.1		$	360.6		$	342.4

Reconciliation of U.S. federal statutory tax rate

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,
	2015		2014		2013
Federal statutory tax rate	35.0	%	35.0	%	35.0	%
Increase/(decrease) resulting from:
State income taxes, net of federal tax benefit	3.0	%	3.3	%	3.0	%
Tax settlement	—	%	—	%	1.5	%
Tax-exempt municipal bond interest	(1.5	)%	(1.5	)%	(1.7	)%
Other items	(0.2	)%	(0.3	)%	(0.2	)%
Effective income tax rate	36.3	%	36.5	%	37.6	%

Reconciliation of gross unrecognized tax benefits, not including interest or other potential offsetting effects

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	2015			2014			2013
Balance as of beginning of fiscal year	$	40.0		$	26.7		$	41.7
Additions for tax positions of the current year	6.7			11.2			28.5
Additions for tax positions of prior years	0.8			4.2			12.2
Reductions for tax positions of prior years	(0.4		)	(1.8		)	(0.5		)
Settlements with tax authorities	(1.2		)	—			(55.0		)
Expiration of the statute of limitations	(6.0		)	(0.3		)	(0.2		)
Balance as of end of fiscal year	$	39.9		$	40.0		$	26.7

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Basic and Diluted Earnings Per Share

12 Months Ended

May. 31, 2015

Earnings Per Share [Abstract]

Basic and Diluted Earnings Per Share

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	2015		2014		2013
Basic earnings per share:
Net income	$	674.9	$	627.5	$	569.0
Weighted-average common shares outstanding	362.9		364.5		363.8
Basic earnings per share	$	1.86	$	1.72	$	1.56
Diluted earnings per share:
Net income	$	674.9	$	627.5	$	569.0
Weighted-average common shares outstanding	362.9		364.5		363.8
Dilutive effect of common share equivalents	1.7		1.6		0.9
Weighted-average common shares outstanding, assuming dilution	364.6		366.1		364.7
Diluted earnings per share	$	1.85	$	1.71	$	1.56
Weighted-average anti-dilutive common share equivalents	0.3		0.7		6.5

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 Company announced that its Board of Directors (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 2015, the Company repurchased 3.9 million shares for $182.4 million under this program. During fiscal 2014, the Company repurchased 6.2 million shares for $249.7 million under a previous Board-approved program to repurchase up to $350.0 million of its common stock which expired on May 31, 2014. All shares repurchased were retired.

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Accumulated Other Comprehensive Income (Tables)

12 Months Ended

May. 31, 2015

Equity [Abstract]

Changes in accumulated other comprehensive income

The changes in accumulated other comprehensive income are as follows:

	Year ended May 31,
In millions	2015			2014			2013
Beginning balance	$	21.5		$	22.0		$	37.7
Other comprehensive loss:
Unrealized holding (losses)/gains	(21.5		)	0.3			(24.1		)
Income tax benefit/(expense) related to unrealized holding gains/(losses)	7.7			(0.4		)	9.0
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income	(0.3		)	(0.6		)	(0.9		)
Income tax expense on reclassification adjustment for the net gain on sale of available-for-sale securities	0.1			0.2			0.3
Total other comprehensive loss, net of tax	(14.0		)	(0.5		)	(15.7		)
Ending balance	$	7.5		$	21.5		$	22.0
Total tax (benefit)/expense included in other comprehensive loss	$	(7.8	)	$	0.2		$	(9.3	)

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Stock-Based Compensation Plans (Details 1) - May. 31, 2015 - Employee Stock Option [Member] - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Total
Stock Option activity [Roll Forward]
Options outstanding, Beginning balance, Shares	5.4
Options outstanding, Beginning balance, Weighted-average exercise price per share	$ 34.00
Options granted	0.8
Options granted, Weighted-average exercise price per share	$ 41.70
Options exercised	(1.5)
Options exercised, Weighted-average exercise price per share	$ 33.84
Options forfeited	0.0
Options forfeited, Weighted-average exercise price per share	$ 30.15
Options expired	0.0
Options expired, Weighted-average exercise price per share	$ 38.12
Options outstanding, Ending balance, Shares	4.7
Options outstanding, Ending balance, Weighted-average exercise price per share	$ 35.21
Options outstanding, Ending balance, Weighted-average remaining contractual term	6 years
Options outstanding, Ending balance, Aggregate intrinsic value	$ 66.3
Options exercisable, Ending balance, Shares	2.7
Options exercisable, Ending balance, Weighted-average exercise price per share	$ 33.42
Options exercisable, Ending balance, Weighted-average remaining contractual term	4 years 4 months 24 days
Options exercisable, Ending balance, Aggregate intrinsic value	$ 43.0

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Property and Equipment, Net of Accumulated Depreciation (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Components of property and equipment, at cost
Land and improvements	$ 8.3	$ 8.1
Buildings and improvements	102.1	101.1
Data processing equipment	190.9	180.8
Software	391.8	344.8
Furniture, fixtures, and equipment	145.6	145.0
Leasehold improvements	106.2	101.7
Construction in progress	28.5	25.3
Total property and equipment, gross	973.4	906.8
Less: Accumulated depreciation	619.5	564.6
Property and equipment, net of accumulated depreciation	353.9	342.2
Property and Equipment, Net of Accumulated Depreciation (Textual)
Depreciation expense	$ 92.1	$ 89.1	$ 79.2

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Consolidated Statements of Income and Comprehensive Income - Scenario, Unspecified [Domain] - USD ($) shares in Millions, $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Revenue:
Service revenue	$ 2,697.5	$ 2,478.2	$ 2,285.2
Interest on funds held for clients	42.1	40.7	41.0
Total revenue	2,739.6	2,518.9	2,326.2
Expenses:
Operating expenses	808.0	732.5	671.3
Selling, general and administrative expenses	878.0	803.7	750.1
Total expenses	1,686.0	1,536.2	1,421.4
Operating income	1,053.6	982.7	904.8
Investment income, net	6.4	5.4	6.6
Income before income taxes	1,060.0	988.1	911.4
Income taxes	385.1	360.6	342.4
Net income	674.9	627.5	569.0
Other comprehensive loss, net of tax:
Unrealized losses on securities, net of tax	(14.0)	(0.5)	(15.7)
Total other comprehensive loss, net of tax	(14.0)	(0.5)	(15.7)
Comprehensive income	$ 660.9	$ 627.0	$ 553.3
Basic earnings per share	$ 1.86	$ 1.72	$ 1.56
Diluted earnings per share	$ 1.85	$ 1.71	$ 1.56
Weighted-average common shares outstanding	362.9	364.5	363.8
Weighted-average common shares outstanding, assuming dilution	364.6	366.1	364.7
Cash dividends per common share	$ 1.52	$ 1.40	$ 1.31

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Stock-Based Compensation Plans (Details 6) - Restricted Stock [Member] - $ / shares shares in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Restricted Stock Award activity [Roll Forward]
Nonvested/unearned shares, Beginning balance	0.2
Nonvested/unearned shares, Beginning balance, Weighted-average grant-date fair value per share	$ 33.55
Granted	0.1
Granted, Weighted-average grant-date fair value per share	$ 41.70	$ 38.53	$ 31.76
Vested	(0.1)
Vested, Weighted-average grant-date fair value per share	$ 31.79
Forfeited	0.0
Forfeited, Weighted-average grant-date fair value per share	$ 0.00
Nonvested/unearned shares, Ending balance	0.2	0.2
Nonvested/unearned shares, Ending balance, Weighted-average grant-date fair value per share	$ 38.99	$ 33.55

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Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
OPERATING ACTIVITIES
Net income	$ 674.9	$ 627.5	$ 569.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization on property and equipment and intangible assets	106.6	105.0	98.2
Amortization of premiums and discounts on available-for-sale securities	76.2	70.3	56.2
Stock-based compensation costs	31.4	26.3	22.8
(Benefit)/provision for deferred income taxes	(4.1)	(4.9)	5.3
Provision for allowance for doubtful accounts	1.6	2.5	1.7
Net realized gains on sales of available-for-sale securities	(0.3)	(0.6)	(0.9)
Changes in operating assets and liabilities:
Interest receivable	(1.6)	(3.9)	(1.8)
Accounts receivable	(28.2)	(18.2)	8.3
Prepaid expenses and other current assets	(8.5)	22.5	(45.6)
Accounts payable and other current liabilities	51.1	45.1	(16.6)
Net change in other assets and liabilities	(3.9)	9.3	(21.3)
Net cash provided by operating activities	895.2	880.9	675.3
INVESTING ACTIVITIES
Purchases of available-for-sale securities	(34,020.4)	(29,850.5)	(28,332.8)
Proceeds from sales and maturities of available-for-sale securities	33,719.5	30,080.6	27,620.2
Net change in funds held for clients’ money market securities and other cash equivalents	149.1	(441.5)	1,019.4
Purchases of property and equipment	(102.8)	(84.1)	(98.7)
Acquisition of businesses, net of cash acquired	(27.1)	(9.3)	(21.3)
Purchases of other assets	(3.3)	(11.3)	(5.1)
Net cash (used in)/provided by investing activities	(285.0)	(316.1)	181.7
FINANCING ACTIVITIES
Net change in client fund obligations	93.0	127.4	(454.6)
Dividends paid	(551.8)	(510.6)	(476.7)
Repurchases of common shares	(182.4)	(249.7)	0.0
Equity activity related to stock-based awards	48.5	113.3	72.8
Net cash used in financing activities	(592.7)	(519.6)	(858.5)
Increase/(decrease) in cash and cash equivalents	17.5	45.2	(1.5)
Cash and cash equivalents, beginning of fiscal year	152.5	107.3	108.8
Cash and cash equivalents, end of fiscal year	$ 170.0	$ 152.5	$ 107.3

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Income Taxes (Details 3) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Reconciliation of gross unrecognized tax benefits
Balance as of beginning of fiscal year	$ 40.0	$ 26.7	$ 41.7
Additions for tax positions of the current year	6.7	11.2	28.5
Additions for tax positions of prior years	0.8	4.2	12.2
Reductions for tax positions of prior years	(0.4)	(1.8)	(0.5)
Settlements with tax authorities	(1.2)	0.0	(55.0)
Expiration of the statute of limitations	(6.0)	(0.3)	(0.2)
Balance as of end of fiscal year	$ 39.9	$ 40.0	$ 26.7

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Description of Business, Basis of Presentation, and Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Accounting Policies [Abstract]
Disclosure on geographic areas, Description of revenue from external customers	revenue within Germany, which represented less than one percent of the Company's total revenue	revenue within Germany, which represented less than one percent of the Company's total revenue	revenue within Germany, which represented less than one percent of the Company's total revenue
Disclosure on geographic areas, Long-lived assets	Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company	Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company
Minimum period in which payroll taxes are typically remitted after receipt of collections from client	1 day
Maximum period in which payroll taxes are typically remitted after receipt of collections from client	30 days
Maximum Days in Which Payroll Taxes Will Be Remitted After Receipt Of Collections From Client	90 days
Allowance for doubtful accounts	$ 1.4	$ 1.5
Direct costs billed and incurred	4,200.0	3,400.0	$ 3,000.0
Maximum individual workers' compensation claims liability	1.0	1.0
Maximum Individual Claims Liability Health Insurance	0.3	0.3
Workers' compensation insurance costs in current liabilities	11.3	8.5
Workers' compensation insurance costs in long-term liabilities	15.3	16.0
PEO health insurance costs in current liabilities	8.1	4.6
Reserve for uncertain tax positions	29.1	29.8
Property, Plant and Equipment [Line Items]
Goodwill	$ 561.5	$ 540.3
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Minimum [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Minimum [Member] | Data Processing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Minimum [Member] | Furniture Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Minimum [Member] | Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years
Maximum [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	35 years
Maximum [Member] | Data Processing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	4 years
Maximum [Member] | Furniture Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Maximum [Member] | Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years

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Commitments and Contingencies (Details 1) $ in Millions	May. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Future Minimum Payments Due in Fiscal 2016	$ 37.5
Operating Leases, Future Minimum Payments, Due in Fiscal 2017	31.2
Operating Leases, Future Minimum Payments, Due in Fiscal 2018	23.1
Operating Leases, Future Minimum Payments, Due in Fiscal 2019	16.1
Operating Leases, Future Minimum Payments, Due in Fiscal 2020	11.3
Operating Leases, Future Minimum Payments, Due Thereafter	$ 8.5

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Valuation and Qualifying Accounts

12 Months Ended

May. 31, 2015

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure

Valuation and Qualifying Accounts

PAYCHEX, INC.

CONSOLIDATED FINANCIAL STATEMENT SCHEDULE

FOR THE YEAR ENDED MAY 31,

(In millions)

Description	Balance as  of beginning of fiscal year		Additions charged to expenses		Additions to/(Deductions from) other accounts(1)			Costs and   deductions(2)		Balance as of end of fiscal year
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
2013
Allowance for doubtful accounts	$	1.2	$	1.7	$	—		$	1.9	$	1.0
Reserve for client fund losses	$	2.1	$	2.7	$	—		$	2.4	$	2.4

⁽¹⁾  Amounts related to business acquisitions.

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

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Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May. 31, 2015	May. 31, 2014	May. 31, 2013
Basic earnings per share:
Net income	$ 161.2	$ 169.4	$ 173.0	$ 171.3	$ 145.9	$ 160.1	$ 158.7	$ 162.8	$ 674.9	$ 627.5	$ 569.0
Weighted-average common shares outstanding	362.3	363.2	363.0	363.1	363.5	364.2	364.9	365.3	362.9	364.5	363.8
Basic earnings per share	$ 0.44	$ 0.47	$ 0.48	$ 0.47	$ 0.40	$ 0.44	$ 0.43	$ 0.45	$ 1.86	$ 1.72	$ 1.56
Diluted earnings per share:
Net income	$ 161.2	$ 169.4	$ 173.0	$ 171.3	$ 145.9	$ 160.1	$ 158.7	$ 162.8	$ 674.9	$ 627.5	$ 569.0
Weighted-average common shares outstanding	362.3	363.2	363.0	363.1	363.5	364.2	364.9	365.3	362.9	364.5	363.8
Dilutive effect of common share equivalents									1.7	1.6	0.9
Weighted-average common shares outstanding, assuming dilution	364.5	365.0	364.6	364.7	365.3	365.8	366.4	366.7	364.6	366.1	364.7
Diluted earnings per share	$ 0.44	$ 0.46	$ 0.47	$ 0.47	$ 0.40	$ 0.44	$ 0.43	$ 0.44	$ 1.85	$ 1.71	$ 1.56
Weighted-average anti-dilutive common share equivalents									0.3	0.7	6.5

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Basic and Diluted Earnings Per Share (Tables)

12 Months Ended

May. 31, 2015

Earnings Per Share [Abstract]

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	2015		2014		2013
Basic earnings per share:
Net income	$	674.9	$	627.5	$	569.0
Weighted-average common shares outstanding	362.9		364.5		363.8
Basic earnings per share	$	1.86	$	1.72	$	1.56
Diluted earnings per share:
Net income	$	674.9	$	627.5	$	569.0
Weighted-average common shares outstanding	362.9		364.5		363.8
Dilutive effect of common share equivalents	1.7		1.6		0.9
Weighted-average common shares outstanding, assuming dilution	364.6		366.1		364.7
Diluted earnings per share	$	1.85	$	1.71	$	1.56
Weighted-average anti-dilutive common share equivalents	0.3		0.7		6.5

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Related Parties (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
EMC Corporation [Member]
Related Party Transaction [Line Items]
Purchases from related parties	$ 6.9	$ 4.7	$ 6.5
Staples, Inc. [Member]
Related Party Transaction [Line Items]
Purchases from related parties	$ 1.7	$ 1.3	$ 1.6

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

12 Months Ended

May. 31, 2015

Accounting Policies [Abstract]

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

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 payroll, human resource, insurance, and benefits outsourcing solutions 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, 2015 (“fiscal 2015”), 2014 (“fiscal 2014”), and 2013 (“fiscal 2013”). Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company as of May 31, 2015 and May 31, 2014. In addition, the Company has an equity method investment 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 human capital management (“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, online 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.

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. The Company has evaluated subsequent events for potential recognition and/or disclosure through the date of issuance of these financial statements.

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 $1.4 million as of May 31, 2015 and $1.5 million as of May 31, 2014. 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 their respective portfolios are included in interest on funds held for clients and investment income, net.

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 restricted to 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 $561.5 million of goodwill as of May 31, 2015. 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. Impairment is determined by comparing the estimated fair value of a reporting unit to its carrying amount, including goodwill. The Company has the option to perform a qualitative assessment to determine if it is more-likely-than-not that the fair value of a reporting unit has declined below its carrying value. This assessment considers various financial, macroeconomic, industry, and reporting unit specific qualitative factors. The Company performs its annual impairment testing in its fiscal fourth quarter. Based on the results of the Company’s reviews, no impairment loss was recognized in the results of operations for fiscal years 2015, 2014, or 2013. 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. 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 costs 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. In fiscal 2014, with the addition of a new health care offering within the PEO, we began classifying direct costs related to certain benefit plans where the Company retains risk 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 $4.2 billion, $3.4 billion, and $3.0 billion for fiscal years 2015, 2014, and 2013, 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 $1.0 million under both its fiscal 2015 and fiscal 2014 workers' compensation policies. As of May 31, 2015 and May 31, 2014, the Company had recorded current liabilities of $11.3 million and $8.5 million, respectively, and long-term liabilities of $15.3 million and $16.0 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 2015 and 2014 minimum premium health insurance plan policies. Amounts accrued related to the health insurance reserves are $8.1 million and $4.6 million as of May 31, 2015 and May 31, 2014, respectively. These amounts are included in current liabilities on the Consolidated Balance Sheet.

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 D 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 $29.1 million as of May 31, 2015 and $29.8 million as of May 31, 2014. Refer to Note I 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.

Recently adopted accounting pronouncements:  In November 2014, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) No. 2014-17, “Business Combinations (Topic 805) - Pushdown Accounting (a consensus of the FASB Emerging Issues Task Force).” This guidance provides the option for an acquired entity to apply pushdown accounting in its separately issued financial statements when a change-in-control event occurs. This guidance was effective for change-in-control events after November 18, 2014. Adoption of this guidance did not have any effect on the Company's consolidated financial statements.

In June 2014, the Company adopted FASB ASU 2013-11, “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the FASB Emerging Issues Task Force).” This ASU provides explicit guidance regarding the presentation in the statement of financial position of an unrecognized tax benefit when net operating losses or tax credit carryforwards exist. It was effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. Adoption of this guidance did not have an effect on the Company's consolidated financial statements.

In January 2014, the FASB issued ASU 2014-01, “Investments – Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force).” This ASU permits a company to make an accounting policy election to account for investments in qualified affordable housing projects under a new proportional amortization method. If such an election is not made, the ASU requires use of the equity or cost method for investments. The ASU is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014, with early adoption permitted. The Company currently accounts for its investments in qualified affordable housing projects using the equity method for investments and the adoption of this guidance did not have any effect on the its consolidated financial statements.

Recently issued accounting pronouncements:  In May 2015, the FASB issued ASU No. 2015-09, “Financial Services-Insurance (Topic 944): Disclosures about Short-Duration Contracts.” This guidance requires insurance entities to disclose for annual reporting periods incurred and paid claims development information by accident year, after reinsurance, for the number of years for which claims typically remain open. Disclosures should also include quantitative information about claim frequency and a qualitative description of methodologies used for determining claim frequency information. This guidance is effective for annual reporting periods, including interim periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early and retrospective application is permitted. The Company is currently evaluating this guidance, but does not anticipate it will have a material impact to its consolidated financial statements.

In May 2015, the FASB issued ASU No. 2015-07, “Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) (a consensus of the FASB Emerging Issues Task Force).” This guidance removes the requirement to categorize within the fair value hierarchy investments for which fair value is measured using the net asset value per share practical expedient and removes certain related disclosure requirements. This guidance is effective for annual reporting periods, including interim periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted. The Company does not anticipate this guidance will have a material impact to its consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-05, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement.” This guidance clarifies the accounting treatment for fees paid in cloud computing arrangements, including the determination of whether a cloud computing arrangement includes a software license.  This guidance is effective for annual reporting periods, including interim periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted. The Company is currently evaluating this guidance, but does not anticipate it will have a material impact to its consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, “Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs.” This Guidance requires debt issuance costs to be presented in the balance sheet as a reduction of the related debt liability rather than an asset. This guidance is effective for annual reporting periods, including interim periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted for financial statements not previously issued. The Company does not anticipate this guidance will have a material impact to its consolidated financial statements.

In February 2015, the FASB issued ASU No. 2015-02 “Consolidation (Topic 810): Amendments to the Consolidation Analysis.” This guidance focuses on a reporting company’s consolidation evaluation to determine whether they should consolidate certain legal entities. This guidance is effective for annual periods beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted, including adoption in an interim period. The Company is currently evaluating this guidance, but does not anticipate it will have a material impact to its consolidated financial statements.

In January 2015, the FASB issued ASU No. 2015-01 “Income Statement - Extraordinary and Unusual Items (Subtopic 225-20)-Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items.” This guidance eliminates from GAAP the concept of extraordinary items and is effective for annual reporting periods, including interim reporting periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted. The Company does not anticipate it will have a material impact to its consolidated financial statements.

In June 2014, the FASB issued ASU No. 2014-12, “Compensation—Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (a consensus of the FASB Emerging Issues Task Force).” This guidance requires a performance target that affects vesting and that could be achieved after the requisite service period to be treated as a performance condition. The current accounting standard for stock-based compensation as it applies to awards with performance conditions should be applied. This guidance is effective for fiscal years, including interim reporting periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. The Company is currently evaluating this guidance, but does not anticipate it will have a material impact to its consolidated financial statements.

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, as recently amended, and will be required to be applied retrospectively. Early application of the guidance is permitted for annual reporting periods beginning after December 31, 2016. This guidance is applicable to the Company's fiscal year beginning June 1, 2017. The Company is currently evaluating this guidance and any potential impact to 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.

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Consolidated Balance Sheets - USD ($) $ in Millions	May. 31, 2015	May. 31, 2014
ASSETS
Cash and cash equivalents	$ 170.0	$ 152.5
Corporate investments	366.6	398.7
Interest receivable	37.9	36.3
Accounts receivable, net of allowance for doubtful accounts	176.6	149.4
Deferred income taxes	15.0	12.0
Prepaid income taxes	12.9	17.2
Prepaid expenses and other current assets	50.8	37.8
Current assets before funds held for clients	829.8	803.9
Funds held for clients	4,273.4	4,198.6
Total current assets	5,103.2	5,002.5
Long-term corporate investments	399.8	385.6
Property and equipment, net of accumulated depreciation	353.9	342.2
Intangible assets, net of accumulated amortization	32.4	40.6
Goodwill	561.5	540.3
Deferred income taxes	0.0	37.1
Other long-term assets	31.7	21.8
Total assets	6,482.5	6,370.1
LIABILITIES
Accounts payable	51.7	48.8
Accrued compensation and related items	210.4	171.7
Deferred income taxes	0.0	6.6
Other current liabilities	50.8	44.7
Current liabilities before client fund obligations	312.9	271.8
Client fund obligations	4,260.1	4,167.1
Total current liabilities	4,573.0	4,438.9
Accrued income taxes	44.8	41.9
Deferred income taxes	16.8	55.7
Other long-term liabilities	62.4	56.6
Total liabilities	$ 4,697.0	$ 4,593.1
Commitments and contingencies - Note M
STOCKHOLDERS' EQUITY
Common stock, $0.01 par value; Authorized: 600.0 shares; Issued and outstanding: 361.2 shares as of May 31, 2015 and 363.0 shares as of May 31, 2014, respectively.	$ 3.6	$ 3.6
Additional paid-in capital	880.1	794.4
Retained earnings	894.3	957.5
Accumulated other comprehensive income	7.5	21.5
Total stockholders' equity	1,785.5	1,777.0
Total liabilities and stockholders' equity	$ 6,482.5	$ 6,370.1

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Supplemental Cash Flow Information

12 Months Ended

May. 31, 2015

Supplemental Cash Flow Information [Abstract]

Supplemental Cash Flow Information

Supplemental Cash Flow Information

Income taxes paid were $372.8 million, $317.8 million, and $371.0 million for fiscal years 2015, 2014, and 2013, respectively.

Lease incentives received in the form of tenant allowances and free rent were $8.5 million, $6.7 million, and $6.4 million for fiscal years 2015, 2014, and 2013, respectively.

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Document and Entity Information - USD ($)	12 Months Ended
	May. 31, 2015	Jun. 30, 2015	Nov. 30, 2014
Entity Information [Line Items]
Entity Registrant Name	PAYCHEX INC
Entity Central Index Key	0000723531
Document Type	10-K
Document Period End Date	May 31, 2015
Amendment Flag	false
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--05-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 15,395,911,785
Entity Common Stock, Shares Outstanding		361,206,331

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Employee Benefit Plans

12 Months Ended

May. 31, 2015

Employee Benefit Plans [Abstract]

Employee Benefit Plans

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 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 2015, 2014, and 2013 were $19.6 million, $16.4 million, and $13.1 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 $14.2 million and $12.3 million as of May 31, 2015 and May 31, 2014, respectively, and are reflected in other long-term liabilities on the accompanying Consolidated Balance Sheets.

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Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	May. 31, 2015	May. 31, 2014
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	600.0	600.0
Common stock, shares issued	361.2	363.0
Common stock, shares outstanding	361.2	363.0

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Fair Value Measurements

12 Months Ended

May. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

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:

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

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

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

◦ 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, including money market securities, 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, 2015
In millions	Carrying value (Fair value)		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (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	$	—	$	—

	May 31, 2014
In millions	Carrying value (Fair value)		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Assets:
Cash equivalents:
Commercial paper	$	6.0	$	—	$	6.0	$	—
General obligation municipal bonds	10.9		—		10.9		—
Pre-refunded municipal bonds	31.2		—		31.2		—
Revenue municipal bonds	17.7		—		17.7		—
Total cash equivalents	$	65.8	$	—	$	65.8	$	—
Available-for-sale securities:
General obligation municipal bonds	$	1,628.5	$	—	$	1,628.5	$	—
Pre-refunded municipal bonds	142.8		—		142.8		—
Revenue municipal bonds	867.8		—		867.8		—
Variable rate demand notes	752.3		—		752.3		—
Total available-for-sale securities	$	3,391.4	$	—	$	3,391.4	$	—
Other	$	12.3	$	12.3	$	—	$	—
Liabilities:
Other long-term liabilities	$	12.3	$	12.3	$	—	$	—

In determining the fair value of its assets and liabilities, the Company predominately uses the market approach. Commercial paper is included in Level 2 because it may not trade on a daily basis. Available-for-sale securities and short-term municipal securities 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 investments, 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 reviews the values generated by the independent pricing service for reasonableness by comparing the valuations received from the independent pricing service to valuations from at least one other observable source for a sample of securities. The Company has not adjusted the prices obtained from the independent pricing service.

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.

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Funds Held for Clients and Corporate Investments

12 Months Ended

May. 31, 2015

Funds Held for Clients and Corporate Investments [Abstract]

Funds Held For Clients and Corporate Investments

Funds Held for Clients and Corporate Investments

Funds held for clients and corporate investments are as follows:

	May 31, 2015
In millions	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair 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

	May 31, 2014
In millions	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Type of issue:
Funds held for clients money market securities and other cash equivalents	$	1,579.2	$	—	$	—		$	1,579.2
Available-for-sale securities:
General obligation municipal bonds	1,605.4		25.0		(1.9		)	1,628.5
Pre-refunded municipal bonds(1)	140.4		2.4		—			142.8
Revenue municipal bonds	858.8		10.1		(1.1		)	867.8
Variable rate demand notes	752.3		—		—			752.3
Total available-for-sale securities	3,356.9		37.5		(3.0		)	3,391.4
Other	10.6		1.7		—			12.3
Total funds held for clients and corporate investments	$	4,946.7	$	39.2	$	(3.0	)	$	4,982.9

⁽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, 2015 and May 31, 2014 are 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	2015		2014
Funds held for clients	$	4,273.4	$	4,198.6
Corporate investments	366.6		398.7
Long-term corporate investments	399.8		385.6
Total funds held for clients and corporate investments	$	5,039.8	$	4,982.9

The Company’s available-for-sale securities reflected a net unrealized gain of $13.6 million as of May 31, 2015 compared with a net unrealized gain of $34.5 million as of May 31, 2014. Included in the net unrealized gain total as of May 31, 2015 and May 31, 2014, there were 280 and 98 available-for-sale securities, respectively, in an unrealized loss position. The securities in an unrealized loss position were as follows:

	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
In millions	Gross unrealized losses			Fair value		Gross unrealized losses			Fair Value		Gross unrealized losses			Fair 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

	May 31, 2014
	Securities in an unrealized loss position for less than twelve months					Securities in an unrealized loss position for more than twelve months					Total
In millions	Gross unrealized losses			Fair value		Gross unrealized losses			Fair Value		Gross unrealized losses			Fair Value
Type of issue:
General obligation municipal bonds	$	(0.1	)	$	69.6	$	(1.8	)	$	164.0	$	(1.9	)	$	233.6
Pre-refunded municipal bonds	—			1.7		—			—		—			1.7
Revenue municipal bonds	—			47.5		(1.1		)	112.4		(1.1		)	159.9
Total	$	(0.1	)	$	118.8	$	(2.9	)	$	276.4	$	(3.0	)	$	395.2

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, 2015 that had unrealized losses of $7.5 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 substantial portion of the securities in an unrealized loss position as of May 31, 2015 and May 31, 2014 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	2015		2014		2013
Gross realized gains	$	0.3	$	0.6	$	0.9
Gross realized losses	—		—		—
Net realized gains	$	0.3	$	0.6	$	0.9

The amortized cost and fair value of available-for-sale securities that had stated maturities as of May 31, 2015 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, 2015
In millions	Amortized cost		Fair value
Maturity date:
Due in one year or less	$	345.8	$	347.8
Due after one year through three years	726.3		734.3
Due after three years through five years	800.9		802.0
Due after five years	1,709.0		1,711.5
Total	$	3,582.0	$	3,595.6

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.

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

12 Months Ended

May. 31, 2015

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 payroll, human resource, insurance, and benefits outsourcing solutions 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, 2015 (“fiscal 2015”), 2014 (“fiscal 2014”), and 2013 (“fiscal 2013”). Long-lived assets in Germany are insignificant in relation to total long-lived assets of the Company as of May 31, 2015 and May 31, 2014. In addition, the Company has an equity method investment 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 human capital management (“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, online 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.

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. The Company has evaluated subsequent events for potential recognition and/or disclosure through the date of issuance of these financial statements.

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 $1.4 million as of May 31, 2015 and $1.5 million as of May 31, 2014. 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 their respective portfolios are included in interest on funds held for clients and investment income, net.

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 restricted to 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 $561.5 million of goodwill as of May 31, 2015. 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. Impairment is determined by comparing the estimated fair value of a reporting unit to its carrying amount, including goodwill. The Company has the option to perform a qualitative assessment to determine if it is more-likely-than-not that the fair value of a reporting unit has declined below its carrying value. This assessment considers various financial, macroeconomic, industry, and reporting unit specific qualitative factors. The Company performs its annual impairment testing in its fiscal fourth quarter. Based on the results of the Company’s reviews, no impairment loss was recognized in the results of operations for fiscal years 2015, 2014, or 2013. 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. 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 costs 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. In fiscal 2014, with the addition of a new health care offering within the PEO, we began classifying direct costs related to certain benefit plans where the Company retains risk 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 $4.2 billion, $3.4 billion, and $3.0 billion for fiscal years 2015, 2014, and 2013, 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 $1.0 million under both its fiscal 2015 and fiscal 2014 workers' compensation policies. As of May 31, 2015 and May 31, 2014, the Company had recorded current liabilities of $11.3 million and $8.5 million, respectively, and long-term liabilities of $15.3 million and $16.0 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 2015 and 2014 minimum premium health insurance plan policies. Amounts accrued related to the health insurance reserves are $8.1 million and $4.6 million as of May 31, 2015 and May 31, 2014, respectively. These amounts are included in current liabilities on the Consolidated Balance Sheet.

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 D 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 $29.1 million as of May 31, 2015 and $29.8 million as of May 31, 2014. Refer to Note I 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.

Recently adopted and recently issued accounting pronouncements

Recently adopted accounting pronouncements:  In November 2014, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) No. 2014-17, “Business Combinations (Topic 805) - Pushdown Accounting (a consensus of the FASB Emerging Issues Task Force).” This guidance provides the option for an acquired entity to apply pushdown accounting in its separately issued financial statements when a change-in-control event occurs. This guidance was effective for change-in-control events after November 18, 2014. Adoption of this guidance did not have any effect on the Company's consolidated financial statements.

In June 2014, the Company adopted FASB ASU 2013-11, “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the FASB Emerging Issues Task Force).” This ASU provides explicit guidance regarding the presentation in the statement of financial position of an unrecognized tax benefit when net operating losses or tax credit carryforwards exist. It was effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. Adoption of this guidance did not have an effect on the Company's consolidated financial statements.

In January 2014, the FASB issued ASU 2014-01, “Investments – Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force).” This ASU permits a company to make an accounting policy election to account for investments in qualified affordable housing projects under a new proportional amortization method. If such an election is not made, the ASU requires use of the equity or cost method for investments. The ASU is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014, with early adoption permitted. The Company currently accounts for its investments in qualified affordable housing projects using the equity method for investments and the adoption of this guidance did not have any effect on the its consolidated financial statements.

Recently issued accounting pronouncements:  In May 2015, the FASB issued ASU No. 2015-09, “Financial Services-Insurance (Topic 944): Disclosures about Short-Duration Contracts.” This guidance requires insurance entities to disclose for annual reporting periods incurred and paid claims development information by accident year, after reinsurance, for the number of years for which claims typically remain open. Disclosures should also include quantitative information about claim frequency and a qualitative description of methodologies used for determining claim frequency information. This guidance is effective for annual reporting periods, including interim periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early and retrospective application is permitted. The Company is currently evaluating this guidance, but does not anticipate it will have a material impact to its consolidated financial statements.

In May 2015, the FASB issued ASU No. 2015-07, “Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) (a consensus of the FASB Emerging Issues Task Force).” This guidance removes the requirement to categorize within the fair value hierarchy investments for which fair value is measured using the net asset value per share practical expedient and removes certain related disclosure requirements. This guidance is effective for annual reporting periods, including interim periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted. The Company does not anticipate this guidance will have a material impact to its consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-05, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement.” This guidance clarifies the accounting treatment for fees paid in cloud computing arrangements, including the determination of whether a cloud computing arrangement includes a software license.  This guidance is effective for annual reporting periods, including interim periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted. The Company is currently evaluating this guidance, but does not anticipate it will have a material impact to its consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, “Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs.” This Guidance requires debt issuance costs to be presented in the balance sheet as a reduction of the related debt liability rather than an asset. This guidance is effective for annual reporting periods, including interim periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted for financial statements not previously issued. The Company does not anticipate this guidance will have a material impact to its consolidated financial statements.

In February 2015, the FASB issued ASU No. 2015-02 “Consolidation (Topic 810): Amendments to the Consolidation Analysis.” This guidance focuses on a reporting company’s consolidation evaluation to determine whether they should consolidate certain legal entities. This guidance is effective for annual periods beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted, including adoption in an interim period. The Company is currently evaluating this guidance, but does not anticipate it will have a material impact to its consolidated financial statements.

In January 2015, the FASB issued ASU No. 2015-01 “Income Statement - Extraordinary and Unusual Items (Subtopic 225-20)-Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items.” This guidance eliminates from GAAP the concept of extraordinary items and is effective for annual reporting periods, including interim reporting periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. Early adoption is permitted. The Company does not anticipate it will have a material impact to its consolidated financial statements.

In June 2014, the FASB issued ASU No. 2014-12, “Compensation—Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (a consensus of the FASB Emerging Issues Task Force).” This guidance requires a performance target that affects vesting and that could be achieved after the requisite service period to be treated as a performance condition. The current accounting standard for stock-based compensation as it applies to awards with performance conditions should be applied. This guidance is effective for fiscal years, including interim reporting periods, beginning after December 15, 2015, and is applicable to the Company's fiscal year beginning June 1, 2016. The Company is currently evaluating this guidance, but does not anticipate it will have a material impact to its consolidated financial statements.

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, as recently amended, and will be required to be applied retrospectively. Early application of the guidance is permitted for annual reporting periods beginning after December 31, 2016. This guidance is applicable to the Company's fiscal year beginning June 1, 2017. The Company is currently evaluating this guidance and any potential impact to 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.

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Commitments and Contingencies

12 Months Ended

May. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Lines of credit:  As of May 31, 2015, 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 28, 2016
Bank of America, N.A.	$250 million	February 28, 2016
PNC Bank, National Association	$150 million	February 28, 2016
Wells Fargo Bank, National Association	$150 million	February 28, 2016

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 2015 or as of May 31, 2015.

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 facility: In June 2013, the Company entered into a committed, unsecured, five-year syndicated credit facility, expiring on June 21, 2018. Under the credit facility, Paychex of New York LLP (the “Borrower”) may, subject to certain restrictions, borrow up to $750 million to meet short-term funding requirements. In July 2014, a supplemental agreements were executed increasing the maximum borrowing capacity under the facility from $500 million to $750 million. 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 June 2018, any borrowings outstanding will mature and be payable on such date.

There were no amounts outstanding under this credit facility as of May 31, 2015. During fiscal 2015, the Company borrowed against this facility, for one day each, as follows:

$ in millions Fiscal quarter	Amount borrowed		Interest rate
First quarter	$	100.0	3.25	%
Second quarter	$	150.0	3.25	%
Third quarter	$	—	—
Fourth quarter	$	—	—

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.

Letters of credit:  The Company had irrevocable standby letters of credit outstanding totaling $43.0 million both as of May 31, 2015 and May 31, 2014, required to secure commitments for certain insurance policies. The letters of credit expire at various dates between July 2015 and April 2016, and are collateralized by securities held in the Company’s investment portfolios. No amounts were outstanding on these letters of credit during fiscal 2015 or as of May 31, 2015. Subsequent to May 31, 2015, the letter of credit expiring in July 2015 was renewed through July 2016.

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 2015, 2014, and 2013 was $39.4 million, $39.1 million, and $39.9 million, respectively. As of May 31, 2015, future minimum lease payments under various non-cancelable operating leases with terms of more than one year are as follows:

In millions Year ending May 31,	Minimum lease  payments
2016	$	37.5
2017	31.2
2018	23.1
2019	16.1
2020	11.3
Thereafter	8.5

Other commitments:    As of May 31, 2015, the Company had outstanding commitments under purchase orders and legally binding contractual arrangements with minimum future payment obligations of approximately $104.8 million, including $9.5 million of commitments to purchase capital assets. These minimum future payment obligations relate to the following fiscal years:

In millions Year ending May 31,	Minimum payment  obligation
2016	$	71.2
2017	26.8
2018	4.4
2019	1.9
2020	0.3
Thereafter	0.2

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.

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Income Taxes

12 Months Ended

May. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

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

	May 31,
In millions	2015			2014
Deferred tax assets:
Compensation and employee benefit liabilities	$	20.9		$	18.7
Other current liabilities	6.9			6.9
Tax credit carry forward	40.1			38.3
Depreciation	11.9			8.3
Stock-based compensation	21.6			21.1
Other	24.9			28.7
Gross deferred tax assets	126.3			122.0
Deferred tax liabilities:
Capitalized software	53.6			50.1
Depreciation	3.8			12.2
Goodwill and Intangible assets	52.0			46.7
Revenue not subject to current taxes	13.1			12.6
Unrealized gains on available-for-sale securities	5.3			13.2
Other	0.3			0.4
Gross deferred tax liabilities	128.1			135.2
Net deferred tax liability	$	(1.8	)	$	(13.2	)

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	2015			2014			2013
Current:
Federal	$	341.4		$	314.5		$	274.2
State	47.8			51.0			62.9
Total current	389.2			365.5			337.1
Deferred:
Federal	(5.1		)	(3.5		)	5.5
State	1.0			(1.4		)	(0.2		)
Total deferred	(4.1		)	(4.9		)	5.3
Income taxes	$	385.1		$	360.6		$	342.4

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,
	2015		2014		2013
Federal statutory tax rate	35.0	%	35.0	%	35.0	%
Increase/(decrease) resulting from:
State income taxes, net of federal tax benefit	3.0	%	3.3	%	3.0	%
Tax settlement	—	%	—	%	1.5	%
Tax-exempt municipal bond interest	(1.5	)%	(1.5	)%	(1.7	)%
Other items	(0.2	)%	(0.3	)%	(0.2	)%
Effective income tax rate	36.3	%	36.5	%	37.6	%

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, 2015 and May 31, 2014, the total reserve for uncertain tax positions, including interest and net of federal benefits, was $29.1 million and $29.8 million, respectively. As of May 31, 2015 and May 31, 2014, $29.1 million and $28.6 million, respectively, of the total reserves for uncertain tax positions, including interest and net of federal benefits, 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	2015			2014			2013
Balance as of beginning of fiscal year	$	40.0		$	26.7		$	41.7
Additions for tax positions of the current year	6.7			11.2			28.5
Additions for tax positions of prior years	0.8			4.2			12.2
Reductions for tax positions of prior years	(0.4		)	(1.8		)	(0.5		)
Settlements with tax authorities	(1.2		)	—			(55.0		)
Expiration of the statute of limitations	(6.0		)	(0.3		)	(0.2		)
Balance as of end of fiscal year	$	39.9		$	40.0		$	26.7

In May 2013, the Company executed a closing agreement that resolved tax matters related to the audits by New York State for the fiscal year ended May 31, 2004 (“fiscal 2004”) through the fiscal year ended May 31, 2011 (“fiscal 2011”). As a result, the reserve for uncertain tax positions was increased by $21.2 million in May 2013. The resolution and execution of the closing agreement in May 2013 on the open tax matters for fiscal 2004 through fiscal 2011 impacted the Company's effective income tax rate for fiscal 2013, as noted in the reconciliation of the U.S. federal statutory rate to the Company's effective income tax rate.

The reserve as of May 31, 2015 substantially relates to uncertain tax positions for state income tax matters. The Company believes the reserve for uncertain tax positions, including interest and net of federal benefits, of $29.1 million as of May 31, 2015 adequately covers open tax years and uncertain tax positions up to and including fiscal 2015 for major taxing jurisdictions. As of May 31, 2015, the entire $29.1 million of unrecognized tax benefits, if recognized, would impact the Company’s effective income tax rate. As of May 31, 2014, $24.6 million of the $29.8 million unrecognized tax benefits, if recognized, would have impacted 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 2013 is currently under audit by the IRS and fiscal years 2012, 2014, and 2015 are subject to potential audit. With limited exception, state income tax audits by taxing authorities are closed through the fiscal year ended May 31, 2010, 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 2015, 2014, and 2013 was immaterial to the Company’s results of operations.

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Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2013	May. 31, 2015	May. 31, 2014
Income Taxes (Details Textual) [Abstract]
Total reserve for uncertain tax positions		$ 29.1	$ 29.8
Total reserve for uncertain tax positions included in long-term liabilities		29.1	28.6
Reserve for uncertain tax positions, increase in May 2013	$ 21.2
Impact of uncertain tax positions, if recognized, on company's effective income tax rate		$ 29.1	$ 24.6

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Property and Equipment, Net of Accumulated Depreciation

12 Months Ended

May. 31, 2015

Property, Plant and Equipment [Abstract]

Property and Equipment, Net of Accumulated Depreciation

Property and Equipment, Net of Accumulated Depreciation

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

	May 31,
In millions	2015		2014
Land and improvements	$	8.3	$	8.1
Buildings and improvements	102.1		101.1
Data processing equipment	190.9		180.8
Software	391.8		344.8
Furniture, fixtures, and equipment	145.6		145.0
Leasehold improvements	106.2		101.7
Construction in progress	28.5		25.3
Total property and equipment, gross	973.4		906.8
Less: Accumulated depreciation	619.5		564.6
Property and equipment, net of accumulated depreciation	$	353.9	$	342.2

Depreciation expense was $92.1 million, $89.1 million, and $79.2 million for fiscal years 2015, 2014, and 2013, respectively.

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Goodwill and Intangible Assets, Net of Accumulated Amortization

12 Months Ended

May. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, Net of Accumulated Amortization

Goodwill and Intangible Assets, Net of Accumulated Amortization

The Company had goodwill balances on its Consolidated Balance Sheets of $561.5 million as of May 31, 2015, and $540.3 million as of May 31, 2014. The increase in goodwill since May 31, 2014 was the result of an immaterial business acquisition.

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

	May 31,
In millions	2015		2014
Client lists	$	244.6	$	240.9
Other intangible assets	3.2		2.6
Total intangible assets, gross	247.8		243.5
Less: Accumulated amortization	215.4		202.9
Intangible assets, net of accumulated amortization	$	32.4	$	40.6

During fiscal 2015, the Company acquired intangible assets with weighted-average amortization periods as follows: customer lists — 8.0 years; other intangible assets — 3.0 years; and total — 7.6 years. Amortization expense relating to intangible assets was $14.5 million, $15.9 million, and $19.0 million for fiscal years 2015, 2014, and 2013, respectively.

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

In millions Year ending May 31,	Estimated amortization  expense
2016	$	11.3
2017	8.2
2018	5.5
2019	3.6
2020	2.0

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Accumulated Other Comprehensive Income

12 Months Ended

May. 31, 2015

Equity [Abstract]

Accumulated Other Comprehensive Income

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	2015			2014			2013
Beginning balance	$	21.5		$	22.0		$	37.7
Other comprehensive loss:
Unrealized holding (losses)/gains	(21.5		)	0.3			(24.1		)
Income tax benefit/(expense) related to unrealized holding gains/(losses)	7.7			(0.4		)	9.0
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income	(0.3		)	(0.6		)	(0.9		)
Income tax expense on reclassification adjustment for the net gain on sale of available-for-sale securities	0.1			0.2			0.3
Total other comprehensive loss, net of tax	(14.0		)	(0.5		)	(15.7		)
Ending balance	$	7.5		$	21.5		$	22.0
Total tax (benefit)/expense included in other comprehensive loss	$	(7.8	)	$	0.2		$	(9.3	)

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.

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Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2015
Line of Credit [Member] | JP Morgan Chase Bank, N.A. [Member]
Lines of credit
Amount available	$ 350.0				$ 350.0
Expiration date					Feb. 28, 2016
Line of Credit [Member] | Bank of America, N.A. [Member]
Lines of credit
Amount available	250.0				$ 250.0
Expiration date					Feb. 28, 2016
Line of Credit [Member] | PNC Bank, National Association [Member]
Lines of credit
Amount available	150.0				$ 150.0
Expiration date					Feb. 28, 2016
Line of Credit [Member] | Wells Fargo Bank, National Association [Member]
Lines of credit
Amount available	150.0				$ 150.0
Expiration date					Feb. 28, 2016
Revolving Credit Facility [Member]
Lines of credit
Expiration date					Jun. 21, 2018
Maximum Amount Outstanding During Period	$ 0.0	$ 0.0	$ 150.0	$ 100.0
Interest Rate on amount borrowed	0.00%	0.00%	3.25%	3.25%

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Commitments and Contingencies (Details 2) $ in Millions	May. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Future minimum payment obligations under purchase orders and contractual arrangements, Due in Fiscal 2016	$ 71.2
Future minimum payment obligations under purchase orders and contractual arrangements, Due in Fiscal 2017	26.8
Future minimum payment obligations under purchase orders and contractual arrangements, Due in Fiscal 2018	4.4
Future minimum payment obligations under purchase orders and contractual arrangements, Due in Fiscal 2019	1.9
Future minimum payment obligations under purchase orders and contractual arrangements, Due in Fiscal 2020	0.3
Future minimum payment obligations under purchase orders and contractual arrangements, Due Thereafter	$ 0.2

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Employee Benefit Plans (Details) - USD ($) $ in Millions	7 Months Ended	12 Months Ended			21 Months Ended
	May. 31, 2014	May. 31, 2015	May. 31, 2014	May. 31, 2013	Nov. 14, 2013
Employee Benefit Plans [Abstract]
Years of service to be eligible for Company match contribution		1 year
Maximum percentage of salary deferral under 401(k) plan		50.00%
Company contributions to the plan		$ 19.6	$ 16.4	$ 13.1
Amounts accrued under deferred compensation plans	$ 12.3	$ 14.2	$ 12.3
Percentage of eligible pay that is matched by the employer		50.00%
Percentage of employee pay eligible for employer matching contribution	8.00%	8.00%			6.00%
Percentage of annual base salary that eligible employees can defer under Deferred Compensation Plan		50.00%
Percentage of board cash compensation that may be deferred under Deferred Compensation Plan		100.00%

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Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

May. 31, 2015

Quarterly Financial Data (Unaudited) [Abstract]

Quarterly Financial Data (Unaudited)

	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

	Three Months Ended
Fiscal 2014	August 31		November 30		February 28		May 31		Full Year
Service revenue (3)	$	603.1	$	606.4	$	639.9	$	628.8	$	2,478.2
Interest on funds held for clients	10.0		10.0		10.5		10.2		40.7
Total revenue (3)	$	613.1	$	616.4	$	650.4	$	639.0	$	2,518.9
Operating income	$	255.1	$	248.6	$	250.7	$	228.3	$	982.7
Investment income, net	1.2		1.3		1.5		1.4		5.4
Income before income taxes	256.3		249.9		252.2		229.7		988.1
Income taxes	93.5		91.2		92.1		83.8		360.6
Net income	$	162.8	$	158.7	$	160.1	$	145.9	$	627.5
Basic earnings per share(1)	$	0.45	$	0.43	$	0.44	$	0.40	$	1.72
Diluted earnings per share(1)	$	0.44	$	0.43	$	0.44	$	0.40	$	1.71
Weighted-average common shares outstanding	365.3		364.9		364.2		363.5		364.5
Weighted-average common shares outstanding, assuming dilution	366.7		366.4		365.8		365.3		366.1
Cash dividends per common share	$	0.35	$	0.35	$	0.35	$	0.35	$	1.40
Total net realized gains(2)	$	0.2	$	—	$	0.3	$	0.1	$	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.

⁽³⁾  With the introduction of the new health insurance offering within the PEO during fiscal 2014, the Company began classifying PEO direct costs related to certain benefit plans where the Company retains risk as operating expenses rather than as a reduction in service revenue. As a result, the amounts reported for service revenue and total revenue for the first through third quarters of fiscal 2014 differ from that reported in the Company's Quarterly Reports on Form 10-Q (“Form 10-Q”). There was no impact to operating income from this change. The correction for the PEO direct cost adjustment was not material to any prior interim period in fiscal 2014. Service revenue, as reported in the Company's Form 10-Qs was $597.9 million, $600.5 million, and $626.0 million for the first, second, and third fiscal quarters of fiscal 2014, respectively. Total revenue, as reported in the Company's Form 10-Qs was $607.9 million, $610.5 million, and $636.5 million for the first, second, and third fiscal quarters of fiscal 2014, respectively.

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Funds Held for Clients and Corporate Investments (Details 2) $ in Millions	3 Months Ended								12 Months Ended
	May. 31, 2015 USD ($) Security	Feb. 28, 2015 USD ($)	Nov. 30, 2014 USD ($)	Aug. 31, 2014 USD ($)	May. 31, 2014 USD ($) Security	Feb. 28, 2014 USD ($)	Nov. 30, 2013 USD ($)	Aug. 31, 2013 USD ($)	May. 31, 2015 USD ($) Security	May. 31, 2014 USD ($) Security	May. 31, 2013 USD ($)
Funds Held for Clients and Corporate Investments [Abstract]
Gross realized gains									$ 0.3	$ 0.6	$ 0.9
Gross realized losses									0.0	0.0	0.0
Net realized gains	$ 0.1	$ 0.0	$ 0.1	$ 0.1	$ 0.1	$ 0.3	$ 0.0	$ 0.2	0.3	0.6	$ 0.9
Maturity Date:
Due in one year or less, Amortized cost	345.8								345.8
Due in one year or less, Fair value	347.8								347.8
Due after one year through three years, Amortized cost	726.3								726.3
Due after one year through three years, Fair value	734.3								734.3
Due after three years through five years, Amortized cost	800.9								800.9
Due after three years through five years, Fair value	802.0								802.0
Due after five years, Amortized cost	1,709.0								1,709.0
Due after five years, Fair value	1,711.5								1,711.5
Total, Amortized cost	3,582.0								3,582.0
Fair value	3,595.6				3,391.4				3,595.6	3,391.4
Funds Held for Clients and Corporate Investments (Textual)
Net unrealized gain on available-for-sale securities	$ 13.6				$ 34.5				$ 13.6	$ 34.5
Number of available-for-sale securities in an unrealized loss position | Security	280				98				280	98
Minimum maturity period for VRDNs primarily categorized as due after five years (in years)									20 years
Maximum maturity period for VRDNs primarily categorized as due after five years (in years)									30 years
Total, Gross unrealized losses	$ (7.5)				$ (3.0)				$ (7.5)	$ (3.0)

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Quarterly Financial Data (Unaudited)

12 Months Ended

May. 31, 2015

Quarterly Financial Data (Unaudited) [Abstract]

Quarterly Financial Data (Unaudited)

Quarterly Financial Data (Unaudited)

In millions, except per share amounts

	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

	Three Months Ended
Fiscal 2014	August 31		November 30		February 28		May 31		Full Year
Service revenue (3)	$	603.1	$	606.4	$	639.9	$	628.8	$	2,478.2
Interest on funds held for clients	10.0		10.0		10.5		10.2		40.7
Total revenue (3)	$	613.1	$	616.4	$	650.4	$	639.0	$	2,518.9
Operating income	$	255.1	$	248.6	$	250.7	$	228.3	$	982.7
Investment income, net	1.2		1.3		1.5		1.4		5.4
Income before income taxes	256.3		249.9		252.2		229.7		988.1
Income taxes	93.5		91.2		92.1		83.8		360.6
Net income	$	162.8	$	158.7	$	160.1	$	145.9	$	627.5
Basic earnings per share(1)	$	0.45	$	0.43	$	0.44	$	0.40	$	1.72
Diluted earnings per share(1)	$	0.44	$	0.43	$	0.44	$	0.40	$	1.71
Weighted-average common shares outstanding	365.3		364.9		364.2		363.5		364.5
Weighted-average common shares outstanding, assuming dilution	366.7		366.4		365.8		365.3		366.1
Cash dividends per common share	$	0.35	$	0.35	$	0.35	$	0.35	$	1.40
Total net realized gains(2)	$	0.2	$	—	$	0.3	$	0.1	$	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.

⁽³⁾  With the introduction of the new health insurance offering within the PEO during fiscal 2014, the Company began classifying PEO direct costs related to certain benefit plans where the Company retains risk as operating expenses rather than as a reduction in service revenue. As a result, the amounts reported for service revenue and total revenue for the first through third quarters of fiscal 2014 differ from that reported in the Company's Quarterly Reports on Form 10-Q (“Form 10-Q”). There was no impact to operating income from this change. The correction for the PEO direct cost adjustment was not material to any prior interim period in fiscal 2014. Service revenue, as reported in the Company's Form 10-Qs was $597.9 million, $600.5 million, and $626.0 million for the first, second, and third fiscal quarters of fiscal 2014, respectively. Total revenue, as reported in the Company's Form 10-Qs was $607.9 million, $610.5 million, and $636.5 million for the first, second, and third fiscal quarters of fiscal 2014, respectively.

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Stock-Based Compensation Plans (Tables)

12 Months Ended

May. 31, 2015

Stock-Based Compensation Plans [Abstract]

Weighted-average assumptions used for valuation under the Black-Scholes model

The weighted-average assumptions used for valuation under the Black-Scholes model are as follows:

	Year ended May 31,
		2014			2013			2015			2014			2013
	Performance stock options							Stock options
Risk-free interest rate		1.5		%	0.7		%	2.1		%	2.0		%	1.0		%
Dividend yield		3.9		%	4.1		%	3.7		%	4.1		%	4.3		%
Volatility factor		.20			.22			.21			.22			.23
Expected option life in years		4.5			4.8			6.0			6.4			6.4
Weighted-average grant-date fair value of stock options granted (per share)		$	3.85		$	3.55		$	5.68		$	4.90		$	3.77

Stock options activity

The following table summarizes stock option activity for the year ended May 31, 2015:

In millions, except per share amounts	Shares subject to options		Weighted-average exercise price per share		Weighted-average remaining contractual term (years)	Aggregate  intrinsic value(1)
Outstanding as of May 31, 2014	5.4		$	34.00
Granted	0.8		$	41.70
Exercised	(1.5	)	$	33.84
Forfeited	—		$	30.15
Expired	—		$	38.12
Outstanding as of May 31, 2015	4.7		$	35.21	6.0	$	66.3
Exercisable as of May 31, 2015	2.7		$	33.42	4.4	$	43.0

⁽¹⁾ Market price of the underlying stock as of May 31, 2015 less the exercise price.

Stock option plan other information

Other information pertaining to stock option grants is as follows:

	Year ended May 31,
In millions, except per share amounts	2015		2014		2013
Total intrinsic value of stock options exercised	$	17.6	$	18.9	$	7.8
Total grant-date fair value of stock options vested	$	3.6	$	3.0	$	3.0

Performance stock options activity

The following table summarizes performance stock option activity for the year ended May 31, 2015:

In millions, except per share amounts	Shares subject to options		Weighted-average exercise price per share		Weighted-average remaining contractual term (years)	Aggregate  intrinsic value(1)
Outstanding as of May 31, 2014	2.8		$	31.25
Granted	—		$	—
Exercised	(0.1	)	$	30.17
Forfeited	—		$	—
Expired	—		$	—
Outstanding as of May 31, 2015	2.7		$	31.31	6.4	$	48.2
Exercisable as of May 31, 2015	0.5		$	31.20	6.3	$	8.6

⁽¹⁾  Market price of the underlying stock as of May 31, 2015 less the exercise price.

RSU Activity

The following table summarizes RSU activity for the year ended May 31, 2015:

In millions, except per share amounts	RSUs		Weighted-average grant-date fair value per share		Weighted-average remaining vesting period (years)	Aggregate  intrinsic value(1)
Nonvested as of May 31, 2014	1.7		$	30.52
Granted	0.7		$	36.64
Vested	(0.5	)	$	28.11
Forfeited	(0.1	)	$	32.60
Nonvested as of May 31, 2015	1.8		$	33.57	3.0	$	88.8

⁽¹⁾  Intrinsic value for RSUs is the market price of the underlying stock as of May 31, 2015.

Other information pertaining to RSUs

Other information pertaining to RSUs is as follows:

	Year ended May 31,
In millions, except per share amounts	2015		2014		2013
Weighted-average grant-date fair value of RSUs granted	$	36.64	$	36.37	$	28.59
Total intrinsic value of RSUs vested	$	21.7	$	18.3	$	15.5
Total grant-date fair value of RSUs vested	$	14.8	$	12.1	$	13.4

Restricted stock award activity

The following table summarizes restricted stock activity for the year ended May 31, 2015:

In millions, except per share amounts	Restricted shares		Weighted-average grant-date fair value per share
Nonvested as of May 31, 2014	0.2		$	33.55
Granted	0.1		$	41.70
Vested	(0.1	)	$	31.79
Forfeited	—		$	—
Nonvested as of May 31, 2015	0.2		$	38.99

Other information pertaining to restricted stock awards

Other information pertaining to restricted stock follows:

	Year ended May 31,
In millions, except per share amounts	2015		2014		2013
Weighted-average grant-date fair value of restricted stock granted	$	41.70	$	38.53	$	31.76
Total grant-date fair value of restricted stock vested	$	3.5	$	3.3	$	2.1

Performance shares activity

The following table summarizes performance share activity for the year ended May 31, 2015:

In millions, except per share amounts	Performance shares		Weighted-average grant-date fair value per share
Nonvested as of May 31, 2014	0.5		$	31.61
Granted (1)	0.2		$	37.61
Vested	(0.1	)	$	28.87
Forfeited	—		$	—
Nonvested as of May 31, 2015	0.6		$	34.24

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

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Funds Held for Clients and Corporate Investments (Details) - USD ($) $ in Millions		May. 31, 2015	May. 31, 2014
Type of issue:
Funds held for clients money market securities and other cash equivalents, Amortized cost		$ 1,430.0	$ 1,579.2
Funds held for clients money market securities and other cash equivalents, Gross unrealized gains		0.0	0.0
Funds held for clients money market securities and other cash equivalents, Gross unrealized losses		0.0	0.0
Funds held for clients money market securities and other cash equivalents, Fair value		1,430.0	1,579.2
Available-for-sale securities:
Amortized cost		3,582.0	3,356.9
Gross unrealized gains		21.1	37.5
Gross unrealized losses		(7.5)	(3.0)
Fair value		3,595.6	3,391.4
Other, Amortized cost		12.7	10.6
Other, Gross unrealized gains		1.5	1.7
Other, Gross unrealized losses		0.0	0.0
Other, Fair value		14.2	12.3
Total funds held for clients and corporate investments, Amortized cost		5,024.7	4,946.7
Total funds held for clients and corporate investments, Gross unrealized gains		22.6	39.2
Total funds held for clients and corporate investments, Gross unrealized losses		(7.5)	(3.0)
Total funds held for clients and corporate investments, Fair value		5,039.8	4,982.9
General obligation municipal bonds [Member]
Available-for-sale securities:
Amortized cost		1,694.0	1,605.4
Gross unrealized gains		14.0	25.0
Gross unrealized losses		(4.3)	(1.9)
Fair value		1,703.7	1,628.5
Pre-refunded municipal bonds [Member]
Available-for-sale securities:
Amortized cost	[1]	101.7	140.4
Gross unrealized gains	[1]	1.0	2.4
Gross unrealized losses	[1]	0.0	0.0
Fair value	[1]	102.7	142.8
Revenue municipal bonds [Member]
Available-for-sale securities:
Amortized cost		960.7	858.8
Gross unrealized gains		6.1	10.1
Gross unrealized losses		(3.2)	(1.1)
Fair value		963.6	867.8
Variable rate demand notes [Member]
Available-for-sale securities:
Amortized cost		825.6	752.3
Gross unrealized gains		0.0	0.0
Gross unrealized losses		0.0	0.0
Fair value		$ 825.6	$ 752.3

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

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Stock-Based Compensation Plans (Details 2) - Employee Stock Option [Member] - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Stock options, other information
Total intrinsic value of stock options exercised	$ 17.6	$ 18.9	$ 7.8
Total grant-date fair value of stock options vested	$ 3.6	$ 3.0	$ 3.0

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Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Beginning balance, shares at May. 31, 2012		362.6
Beginning balance at May. 31, 2012	$ 1,604.5	$ 3.6	$ 561.1	$ 1,002.1	$ 37.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	569.0			569.0
Unrealized losses on securities, net of tax	(15.7)				(15.7)
Cash dividends declared	(476.7)			(476.7)
Stock-based compensation	22.9		22.9
Stock-based award transactions, Shares		2.8
Stock-based award transactions, Value	69.7	$ 0.1	75.5	(5.9)
Ending balance, Shares at May. 31, 2013		365.4
Ending balance at May. 31, 2013	1,773.7	$ 3.7	659.5	1,088.5	22.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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, Shares		(6.2)
Repurchase of common shares, Value	(249.7)	$ (0.1)	(11.2)	(238.4)
Stock-based compensation	26.4		26.4
Stock-based award transactions, Shares		3.8
Stock-based award transactions, Value	$ 110.2		119.7	(9.5)
Ending balance, Shares at May. 31, 2014	363.0	363.0
Ending balance at May. 31, 2014	$ 1,777.0	$ 3.6	794.4	957.5	21.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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, Shares		(3.9)
Repurchase of common shares, Value	(182.4)		(7.2)	(175.2)
Stock-based compensation	31.5		31.5
Stock-based award transactions, Shares		2.1
Stock-based award transactions, Value	$ 50.3		61.4	(11.1)
Ending balance, Shares at May. 31, 2015	361.2	361.2
Ending balance at May. 31, 2015	$ 1,785.5	$ 3.6	$ 880.1	$ 894.3	$ 7.5

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Stock-Based Compensation Plans

12 Months Ended

May. 31, 2015

Stock-Based Compensation Plans [Abstract]

Stock-Based Compensation Plans

Stock-Based Compensation Plans

The Paychex, Inc. 2002 Stock Incentive Plan, as amended and restated, effective on October 13, 2010 (the “2002 Plan”) upon its approval by the Company’s stockholders, authorizes grants of up to 39.1 million shares of the Company’s common stock. As of May 31, 2015, there were 18.6 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 $31.4 million, $26.3 million, and $22.8 million for fiscal years 2015, 2014, and 2013, respectively. Related income tax benefits recognized were $11.7 million, $10.1 million, and $8.5 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, 2015, the total unrecognized compensation cost related to all unvested stock-based awards was $58.1 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 2015. The weighted-average assumptions used for valuation under the Black-Scholes model are as follows:

	Year ended May 31,
		2014			2013			2015			2014			2013
	Performance stock options							Stock options
Risk-free interest rate		1.5		%	0.7		%	2.1		%	2.0		%	1.0		%
Dividend yield		3.9		%	4.1		%	3.7		%	4.1		%	4.3		%
Volatility factor		.20			.22			.21			.22			.23
Expected option life in years		4.5			4.8			6.0			6.4			6.4
Weighted-average grant-date fair value of stock options granted (per share)		$	3.85		$	3.55		$	5.68		$	4.90		$	3.77

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, 2015:

In millions, except per share amounts	Shares subject to options		Weighted-average exercise price per share		Weighted-average remaining contractual term (years)	Aggregate  intrinsic value(1)
Outstanding as of May 31, 2014	5.4		$	34.00
Granted	0.8		$	41.70
Exercised	(1.5	)	$	33.84
Forfeited	—		$	30.15
Expired	—		$	38.12
Outstanding as of May 31, 2015	4.7		$	35.21	6.0	$	66.3
Exercisable as of May 31, 2015	2.7		$	33.42	4.4	$	43.0

⁽¹⁾ Market price of the underlying stock as of May 31, 2015 less the exercise price.

Other information pertaining to stock option grants is as follows:

	Year ended May 31,
In millions, except per share amounts	2015		2014		2013
Total intrinsic value of stock options exercised	$	17.6	$	18.9	$	7.8
Total grant-date fair value of stock options vested	$	3.6	$	3.0	$	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. In July 2014, 23.5% of the awards vested based on achievement against performance targets for fiscal 2014. The remaining awards will vest in full if performance targets for the fiscal year ending May 31, 2016 are achieved.

The following table summarizes performance stock option activity for the year ended May 31, 2015:

In millions, except per share amounts	Shares subject to options		Weighted-average exercise price per share		Weighted-average remaining contractual term (years)	Aggregate  intrinsic value(1)
Outstanding as of May 31, 2014	2.8		$	31.25
Granted	—		$	—
Exercised	(0.1	)	$	30.17
Forfeited	—		$	—
Expired	—		$	—
Outstanding as of May 31, 2015	2.7		$	31.31	6.4	$	48.2
Exercisable as of May 31, 2015	0.5		$	31.20	6.3	$	8.6

⁽¹⁾  Market price of the underlying stock as of May 31, 2015 less the exercise price.

For fiscal 2015, the total intrinsic value of the performance stock options exercised was $2.7 million and the total grant-date fair value of performance stock options vested was $2.6 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, 2015:

In millions, except per share amounts	RSUs		Weighted-average grant-date fair value per share		Weighted-average remaining vesting period (years)	Aggregate  intrinsic value(1)
Nonvested as of May 31, 2014	1.7		$	30.52
Granted	0.7		$	36.64
Vested	(0.5	)	$	28.11
Forfeited	(0.1	)	$	32.60
Nonvested as of May 31, 2015	1.8		$	33.57	3.0	$	88.8

⁽¹⁾  Intrinsic value for RSUs is the market price of the underlying stock as of May 31, 2015.

Other information pertaining to RSUs is as follows:

	Year ended May 31,
In millions, except per share amounts	2015		2014		2013
Weighted-average grant-date fair value of RSUs granted	$	36.64	$	36.37	$	28.59
Total intrinsic value of RSUs vested	$	21.7	$	18.3	$	15.5
Total grant-date fair value of RSUs vested	$	14.8	$	12.1	$	13.4

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, 2015:

In millions, except per share amounts	Restricted shares		Weighted-average grant-date fair value per share
Nonvested as of May 31, 2014	0.2		$	33.55
Granted	0.1		$	41.70
Vested	(0.1	)	$	31.79
Forfeited	—		$	—
Nonvested as of May 31, 2015	0.2		$	38.99

Other information pertaining to restricted stock follows:

	Year ended May 31,
In millions, except per share amounts	2015		2014		2013
Weighted-average grant-date fair value of restricted stock granted	$	41.70	$	38.53	$	31.76
Total grant-date fair value of restricted stock vested	$	3.5	$	3.3	$	2.1

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, 2015:

In millions, except per share amounts	Performance shares		Weighted-average grant-date fair value per share
Nonvested as of May 31, 2014	0.5		$	31.61
Granted (1)	0.2		$	37.61
Vested	(0.1	)	$	28.87
Forfeited	—		$	—
Nonvested as of May 31, 2015	0.6		$	34.24

⁽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:  The Company offers an Employee Stock Purchase Plan to all employees under which the Company’s common stock can be purchased through a payroll deduction with no discount to the market price and no look-back provision. All transactions occur directly through the Company’s transfer agent and no brokerage fees are charged to employees, except for when stock is sold. The plan has been deemed non-compensatory and therefore, no stock-based compensation costs have been recognized for fiscal years 2015, 2014, or 2013 related to this plan.

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Income Taxes (Details 2)	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
Increase/(decrease) resulting from:
State income taxes, net of federal tax benefit	3.00%	3.30%	3.00%
Tax settlement	0.00%	0.00%	1.50%
Tax-exempt municipal bond interest	(1.50%)	(1.50%)	(1.70%)
Other items	(0.20%)	(0.30%)	(0.20%)
Effective income tax rate	36.30%	36.50%	37.60%

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Quarterly Financial Data (Unaudited) (Details) - Scenario, Unspecified [Domain] - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May. 31, 2015	May. 31, 2014	May. 31, 2013
Service revenue	$ 681.4	$ 693.6	$ 665.9	$ 656.6	$ 628.8	$ 639.9	$ 606.4	$ 603.1	$ 2,697.5	$ 2,478.2	$ 2,285.2
Interest on funds held for clients	10.8	10.7	10.4	10.2	10.2	10.5	10.0	10.0	42.1	40.7	41.0
Total revenue	692.2	704.3	676.3	666.8	639.0	650.4	616.4	613.1	2,739.6	2,518.9	2,326.2
Operating income	251.6	264.3	270.2	267.5	228.3	250.7	248.6	255.1	1,053.6	982.7	904.8
Investment income, net	2.0	1.6	1.4	1.4	1.4	1.5	1.3	1.2	6.4	5.4	6.6
Income before income taxes	253.6	265.9	271.6	268.9	229.7	252.2	249.9	256.3	1,060.0	988.1	911.4
Income taxes	92.4	96.5	98.6	97.6	83.8	92.1	91.2	93.5	385.1	360.6	342.4
Net income	$ 161.2	$ 169.4	$ 173.0	$ 171.3	$ 145.9	$ 160.1	$ 158.7	$ 162.8	$ 674.9	$ 627.5	$ 569.0
Basic earnings per share	$ 0.44	$ 0.47	$ 0.48	$ 0.47	$ 0.40	$ 0.44	$ 0.43	$ 0.45	$ 1.86	$ 1.72	$ 1.56
Diluted earnings per share	$ 0.44	$ 0.46	$ 0.47	$ 0.47	$ 0.40	$ 0.44	$ 0.43	$ 0.44	$ 1.85	$ 1.71	$ 1.56
Weighted-average common shares outstanding	362.3	363.2	363.0	363.1	363.5	364.2	364.9	365.3	362.9	364.5	363.8
Weighted-average common shares outstanding, assuming dilution	364.5	365.0	364.6	364.7	365.3	365.8	366.4	366.7	364.6	366.1	364.7
Cash dividends per common share	$ 0.38	$ 0.38	$ 0.38	$ 0.38	$ 0.35	$ 0.35	$ 0.35	$ 0.35	$ 1.52	$ 1.40	$ 1.31
Total net realized gains	$ 0.1	$ 0.0	$ 0.1	$ 0.1	$ 0.1	$ 0.3	$ 0.0	$ 0.2	$ 0.3	$ 0.6	$ 0.9

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Funds Held for Clients and Corporate Investments (Tables)

12 Months Ended

May. 31, 2015

Funds Held for Clients and Corporate Investments [Abstract]

Funds held for clients and corporate investments

Funds held for clients and corporate investments are as follows:

	May 31, 2015
In millions	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair 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

	May 31, 2014
In millions	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Type of issue:
Funds held for clients money market securities and other cash equivalents	$	1,579.2	$	—	$	—		$	1,579.2
Available-for-sale securities:
General obligation municipal bonds	1,605.4		25.0		(1.9		)	1,628.5
Pre-refunded municipal bonds(1)	140.4		2.4		—			142.8
Revenue municipal bonds	858.8		10.1		(1.1		)	867.8
Variable rate demand notes	752.3		—		—			752.3
Total available-for-sale securities	3,356.9		37.5		(3.0		)	3,391.4
Other	10.6		1.7		—			12.3
Total funds held for clients and corporate investments	$	4,946.7	$	39.2	$	(3.0	)	$	4,982.9

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

Classification of investments on the Consolidated Balance Sheets

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

	May 31,
In millions	2015		2014
Funds held for clients	$	4,273.4	$	4,198.6
Corporate investments	366.6		398.7
Long-term corporate investments	399.8		385.6
Total funds held for clients and corporate investments	$	5,039.8	$	4,982.9

Securities in an unrealized loss position

The securities in an unrealized loss position were as follows:

	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
In millions	Gross unrealized losses			Fair value		Gross unrealized losses			Fair Value		Gross unrealized losses			Fair 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

	May 31, 2014
	Securities in an unrealized loss position for less than twelve months					Securities in an unrealized loss position for more than twelve months					Total
In millions	Gross unrealized losses			Fair value		Gross unrealized losses			Fair Value		Gross unrealized losses			Fair Value
Type of issue:
General obligation municipal bonds	$	(0.1	)	$	69.6	$	(1.8	)	$	164.0	$	(1.9	)	$	233.6
Pre-refunded municipal bonds	—			1.7		—			—		—			1.7
Revenue municipal bonds	—			47.5		(1.1		)	112.4		(1.1		)	159.9
Total	$	(0.1	)	$	118.8	$	(2.9	)	$	276.4	$	(3.0	)	$	395.2

Realized gain (loss) on investments

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

	Year ended May 31,
In millions	2015		2014		2013
Gross realized gains	$	0.3	$	0.6	$	0.9
Gross realized losses	—		—		—
Net realized gains	$	0.3	$	0.6	$	0.9

Amortized cost and fair value of available-for-sale securities by contractual maturity

The amortized cost and fair value of available-for-sale securities that had stated maturities as of May 31, 2015 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, 2015
In millions	Amortized cost		Fair value
Maturity date:
Due in one year or less	$	345.8	$	347.8
Due after one year through three years	726.3		734.3
Due after three years through five years	800.9		802.0
Due after five years	1,709.0		1,711.5
Total	$	3,582.0	$	3,595.6

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Investment Income, Net (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May. 31, 2015	May. 31, 2014	May. 31, 2013
Investment Income, Net [Abstract]
Interest income on corporate funds									$ 7.8	$ 6.9	$ 6.7
Interest expense									(0.7)	(1.1)	(0.1)
Net loss from equity-method Investments									(0.7)	(0.4)	0.0
Investment income, net	$ 2.0	$ 1.6	$ 1.4	$ 1.4	$ 1.4	$ 1.5	$ 1.3	$ 1.2	$ 6.4	$ 5.4	$ 6.6

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Related Parties

12 Months Ended

May. 31, 2015

Related Party Transactions [Abstract]

Related Parties

Related Parties

During fiscal years 2015, 2014, and 2013, the Company purchased approximately $6.9 million, $4.7 million, and $6.5 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 2015, 2014, and 2013, the Company purchased approximately $1.7 million, $1.3 million, and $1.6 million, respectively, of office supplies from Staples, Inc. The Vice Chairman of Staples, Inc. is a member of the Company’s Board.