Exhibit 99.1

ADMINISTAFF ANNOUNCES RESULTS FOR

FOURTH QUARTER AND FULL YEAR

· 2008 EBITDA Exceeds $87 Million on Net Income of $46 Million

· 2008 Working Capital Increases to $98 Million

· 2008 Dividends and Share Repurchases Exceed $50 Million

HOUSTON – Feb. 9, 2009 – Administaff, Inc. (NYSE: ASF), a leading provider of human resources services for small and medium-sized businesses, today announced results for the fourth quarter and year ended December 31, 2008.  The company reported fourth quarter net income of $9.7 million and diluted earnings per share of $0.39, down from $13.3 million and $0.50 in the 2007 quarter.  For the full year, the company reported net income and diluted net earnings per share of $45.8 million and $1.79, compared to $47.5 million and $1.74 in 2007.  Lower interest rates negatively impacted investment income, the discounting of workers’ compensation reserves, and the effective income tax rate by $0.06 per share in the fourth quarter and $0.19 per share for the full year 2008 when compared to the respective periods in 2007.

“We are very pleased with Administaff’s financial performance in 2008 against the backdrop of a deteriorating economic climate,” said Paul J. Sarvadi, Administaff chairman and chief executive officer.  “While the growth of our sales staff is encouraging, we have taken a conservative approach to our 2009 operating plan given the recent weakness in the labor market and the near-term outlook for the economy.”

Fourth Quarter Results

Revenues for the fourth quarter of 2008 increased 5.9% over the 2007 period to $426.0 million, due to a 2.9% increase in the average number of worksite employees paid per month and a 3.0% increase in revenues per worksite employee per month.

(more)

Administaff, Inc.

Page 2

Gross profit increased 3.8% over the fourth quarter of 2007 to $87.6 million, due to the growth in the average number of worksite employees paid and an increase in the average gross profit per worksite employee per month from $244 in the 2007 period to $246 in the 2008 period.

Operating expenses for the quarter increased 10.3% to $73.1 million, largely attributable to salaries and wages associated with sales staffing levels and increased marketing efforts.

Operating income for the fourth quarter of 2008 decreased 19.8% to $14.5 million, with an average operating income per worksite employee per month of $41 compared to $52 in the 2007 period.

EBITDA for the fourth quarter was $19.6 million.  Cash outlays included share repurchases of $18.5 million, capital expenditures of $4.1 million and dividends of $3.3 million.

Full Year Results

Revenues in 2008 increased 9.8% to $1.7 billion, due to a 6.0% increase in the average number of worksite employees paid and a 3.6% increase in revenues per worksite employee per month.

Gross profit increased 12.4% to $343.7 million.  The average gross profit per worksite employee increased 6.1% to $245 per month compared to $231 in the 2007 period.

Operating expenses increased 14.4% over the 2007 period to $278.8 million.  On a per worksite employee per month basis, operating expenses increased 8.2% to $199 compared to $184 in the 2007 period.

“In 2008 we generated strong cash flow, with EBITDA plus stock-based compensation totaling $98 million,” said Douglas S. Sharp, senior vice-president of finance, chief financial officer and treasurer.  “Our strong cash flow model combined with a debt-free balance sheet provides a solid foundation from which to manage through these tough economic times.”

The resulting operating income for the year ended December 31, 2008, increased 4.4% to $65.0 million compared to $62.2 million in the 2007 period, with an average monthly operating income per worksite employee of $46 in 2008 compared to $47 in 2007.

During 2008, the company generated $87.7 million of EBITDA and returned $50.5 million to shareholders, including share repurchases of $38.1 million, and dividends of $12.4 million. Working capital at December 31, 2008, was $98.4 million.

Administaff will be hosting a conference call today at 10 a.m. EST to discuss these results, give guidance for the first quarter and full year 2009 and answer questions from investment analysts.  To listen in, call 800-688-0796 and use passcode 38462563.  The call will also be webcast at http://www.administaff.com.  To access the webcast, click on the Investor Relations section of the Web site and select “Live Webcast.”  The conference call script and company guidance will be available at the same Web site later today.  A replay of the conference call will be available at 888-286-8010, passcode 27419331, for two weeks after the call.  The webcast will be archived for one year.

(more)

Administaff, Inc.

Page 3

Administaff is the nation’s leading professional employer organization (PEO), serving as a full-service human resources department that provides small and medium-sized businesses with administrative relief, big-company benefits, reduced liabilities and a systematic way to improve productivity.  The company operates 51 sales offices in 24 major markets. For additional information, visit Administaff’s Web site at http://www.administaff.com.

The statements contained herein that are not historical facts are forward-looking statements within the meaning of the federal securities laws (Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934).  You can identify such forward-looking statements by the words “expects,” “intends,” “plans,” “projects,” “believes,” “estimates,” “likely,” “possibly,” “probably,” “goal,” “objective,” “target,” “assume,” “outlook,” “guidance,” “predicts,” “appears,” “indicator” and similar expressions. Forward-looking statements involve a number of risks and uncertainties.  In the normal course of business, Administaff, Inc., in an effort to help keep our stockholders and the public informed about our operations, may from time to time issue such forward-looking statements, either orally or in writing.  Generally, these statements relate to business plans or strategies, projected or anticipated benefits or other consequences of such plans or strategies, or projections involving anticipated revenues, earnings, unit growth, profit per worksite employee, pricing, operating expenses or other aspects of operating results.  We base the forward-looking statements on our current expectations, estimates and projections.  These statements are not guarantees of future performance and involve risks and uncertainties that we cannot predict. In addition, we have based many of these forward-looking statements on assumptions about future events that may prove to be inaccurate.  Therefore, the actual results of the future events described in such forward-looking statements could differ materially from those stated in such forward-looking statements.  Among the factors that could cause actual results to differ materially are: (i) changes in general economic conditions; (ii) regulatory and tax developments and possible adverse application of various federal, state and local regulations; (iii) changes in our direct costs and operating expenses including, but not limited to, increases in health insurance costs and workers’ compensation rates and underlying claims trends, financial solvency of workers’ compensation carriers and other insurers, state unemployment tax rates, liabilities for employee and client actions or payroll-related claims, changes in the costs of expanding into new markets, and failure to manage growth of our operations; (iv) the effectiveness of our sales and marketing efforts; (v) changes in the competitive environment in the PEO industry, including the entrance of new competitors and our ability to renew or replace client companies; and (vi) our liability for worksite employee payroll and benefits costs.  These factors are discussed in further detail in Administaff’s filings with the U.S. Securities and Exchange Commission.  Any of these factors, or a combination of such factors, could materially affect the results of our operations and whether forward-looking statements we make ultimately prove to be accurate.

(more)

Administaff, Inc.

Page 4

Administaff, Inc.

Summary Financial Information

(in thousands, except per share amounts and statistical data)

	December 31,			December 31,
	2008			2007
Assets
Cash and cash equivalents	$	252,190		$	135,793
Restricted cash		36,466			35,318
Marketable securities		225			74,880
Accounts receivable		125,093			134,834
Prepaid expenses and other current assets		35,646			28,668
Income taxes receivable		—			3,918
Total current assets		449,620			413,411
Property and equipment, net		89,339			77,941
Deposits		68,020			63,720
Other assets		9,861			5,579
Total assets	$	616,840		$	560,651
Liabilities and Stockholders’ Equity
Accounts payable	$	3,007		$	5,236
Payroll taxes and other payroll deductions payable		123,666			113,929
Accrued worksite employee payroll expense		129,954			110,406
Accrued health insurance costs		14,715			19,297
Accrued workers’ compensation costs		38,028			37,150
Other accrued liabilities		35,187			28,518
Current portion of capital lease obligations		537			629
Income tax payable		4,157			—
Deferred income taxes		1,956			1,066
Total current liabilities		351,207			316,231
Capital lease obligations		—			537
Accrued workers’ compensation costs		46,589			39,116
Deferred income taxes		10,565			6,092
Total noncurrent liabilities		57,154			45,745
Stockholders’ equity:
Common stock		309			309
Additional paid-in capital		139,415			138,640
Treasury stock, cost		(147,952	)		(123,600	)
Accumulated other comprehensive income, net of tax		—			5
Retained earnings		216,707			183,321
Total stockholders’ equity		208,479			198,675
Total liabilities and stockholders’ equity	$	616,840		$	560,651

(more)

Administaff, Inc.

Page 5

Administaff, Inc.

Summary Financial Information (continued)

(in thousands, except per share amounts and statistical data)

	Three months ended December 31,									Year ended December 31,
	2008			2007			Change			2008			2007			Change
Operating results:
Revenues (gross billings of $2.803 billion, $2.655 billion, $10.372 billion and $9.437 billion, less worksite employee payroll cost of $2.377 billion, $2.253 billion, $8.648 billion and $7.867 billion, respectively)	$	425,985		$	402,081			5.9	%	$	1,724,434		$	1,569,977			9.8	%
Direct costs:
Payroll taxes, benefits and workers’ compensation costs		338,413			317,735			6.5	%		1,380,695			1,264,055			9.2	%
Gross profit		87,572			84,346			3.8	%		343,739			305,922			12.4	%
Operating expenses:
Salaries, wages and payroll taxes		39,759			34,753			14.4	%		153,538			131,648			16.6	%
Stock-based compensation		2,340			1,885			24.1	%		9,970			7,513			32.7	%
General and administrative expenses		17,044			16,655			2.3	%		69,348			62,453			11.0	%
Commissions		3,086			3,068			0.6	%		12,665			11,795			7.4	%
Advertising		6,668			5,009			33.1	%		17,666			14,143			24.9	%
Depreciation and amortization		4,174			4,905			(14.9	)%		15,570			16,156			(3.6	)%
Total operating expenses		73,071			66,275			10.3	%		278,757			243,708			14.4	%
Operating income		14,501			18,071			(19.8	)%		64,982			62,214			4.4	%
Other income (expense):
Interest income		947			2,777			(65.9	)%		7,057			11,718			(39.8	)%
Interest expense		(12	)		(24	)		(50.0	)%		(66	)		(111	)		(40.5	)%
Other, net		24			(395	)		106.1	%		44			(382	)		111.5	%
		959			2,358			(59.3	)%		7,035			11,225			(37.3	)%
Income before income tax expense		15,460			20,429			(24.3	)%		72,017			73,439			(1.9	)%
Income tax expense		5,752			7,129			(19.3	)%		26,237			25,947			1.1	%
Net income	$	9,708		$	13,300			(27.0	)%	$	45,780		$	47,492			(3.6	)%
Diluted net income per share of common stock	$	0.39		$	0.50			(22.0	)%	$	1.79		$	1.74			2.9	%
Diluted weighted average common shares outstanding		24,935			26,509						25,577			27,264

(more)

Administaff, Inc.

Page 6

Administaff, Inc.

Summary Financial Information (continued)

(in thousands, except per share amounts and statistical data)

	Three months ended							Year ended
	December 31,							December 31,
	2008		2007		Change			2008		2007		Change
Statistical data:
Average number of worksite employees paid per month		118,748		115,451		2.9	%		116,957		110,291		6.0	%
Revenues per worksite employee per month (1)	$	1,196	$	1,161		3.0	%	$	1,229	$	1,186		3.6	%
Gross profit per worksite employee per month		246		244		0.8	%		245		231		6.1	%
Operating expenses per worksite employee per month		205		191		7.3	%		199		184		8.2	%
Operating income per worksite employee per month		41		52		(21.2	)%		46		47		(2.1	)%
Net income per worksite employee per month		27		38		(28.9	)%		33		36		(8.3	)%

(1) Gross billings of $7,867, $7,667, $7,391 and $7,130 per worksite employee per month, less payroll cost of $6,671, $6,506, $6,162 and $5,944 per worksite employee per month, respectively.

(more)

Administaff, Inc.

Page 7

Administaff, Inc.

Summary Financial Information (continued)

(in thousands, except per share amounts and statistical data)

(Unaudited)

GAAP to Non-GAAP Reconciliation Tables

	Three months ended							Year ended
	December 31,							December 31,
	2008		2007		Change			2008		2007		Change
Payroll cost (GAAP)	$	2,376,606	$	2,253,438		5.5	%	$	8,647,774	$	7,866,792		9.9	%
Less: Bonus payroll cost		331,909		346,143		(4.1	)%		809,474		845,149		(4.2	)%
Non-bonus payroll cost	$	2,044,697	$	1,907,295		7.2	%	$	7,838,300	$	7,021,643		11.6	%
Payroll cost per worksite employee (GAAP)	$	6,672	$	6,506		2.6	%	$	6,162	$	5,944		3.7	%
Less: Bonus payroll cost per worksite employee		932		999		(6.7	)%		577		639		(9.7	)%
Non-bonus payroll cost per worksite employee	$	5,740	$	5,507		4.2	%	$	5,585	$	5,305		5.3	%

Non-bonus payroll cost represents payroll cost excluding the impact of bonus payrolls paid to the company’s worksite employees.  Bonus payroll cost varies from period to period, but has no direct impact to the company’s ultimate workers’ compensation costs under the current program.  As a result, Administaff management refers to non-bonus payroll cost in analyzing, reporting and forecasting the company’s workers’ compensation costs.

	Three months ended December 31,				Year ended December 31,
	2008		2007		2008		2007
Net income (GAAP)	$	9,708	$	13,300	$	45,780	$	47,492
Interest expense		12		24		66		111
Income tax expense		5,752		7,129		26,237		25,947
Depreciation and  amortization		4,174		4,905		15,570		16,156
EBITDA	$	19,646	$	25,358	$	87,653	$	89,706
Stock-based compensation	$	2,340	$	1,885	$	9,970	$	7,513
	$	21,986	$	27,243	$	97,623	$	97,219

EBITDA represents net income computed in accordance with generally accepted accounting principles (“GAAP”), plus interest expense, income tax expense, depreciation and amortization expense.  Administaff management believes EBITDA is often a useful measure of the company’s operating performance, as it allows for additional analysis of the company’s operating results separate from the impact of taxes and capital and financing transactions on earnings.

(more)

Administaff, Inc.

Page 9

Non-bonus payroll and EBITDA are not financial measures prepared in accordance with GAAP and may be different from similar measures used by other companies. Non-bonus payroll and EBITDA should not be considered as a substitute for, or superior to, measures of financial performance prepared in accordance with GAAP. Administaff includes non-bonus payroll and EBITDA in this press release because the company believes they are useful to investors in allowing for greater transparency related to the costs incurred under the company’s workers’ compensation program and the company’s operating performance during the periods presented. Investors are encouraged to review the reconciliation of the non-GAAP financial measures used in this press release to their most directly comparable GAAP financial measures as provided in the tables above.

###