Contributions by Program & Source

Contributions to the Social Security and Medicare Trust Funds,
by program and source, 1999-2008 (in millions of dollars)
Program and source		1999	2000	2001	2002	2003	2004	2005	2006	2007	2008

Social Security Trust Funds

Old-Age and Survivors Insurance ^a		$407,023	$432,976	$453,354	$468,107	$468,574	$486,726	$520,706	$550,414	$578,069	$590,121
	Employer	188,461	200,431	210,659	215,897	217,675	223,311	241,018	253,705	265,753	272,060
	Employee	187,160	198,736	207,999	215,039	216,222	222,118	239,163	251,813	263,856	269,956
	Self-employed	20,503	22,216	22,793	24,262	22,179	26,703	26,682	29,269	31,269	32,540
	Taxation of benefits	10,899	11,594	11,903	12,909	12,497	14,593	13,843	15,628	17,192	15,566

Disability Insurance ^a		63,828	71,812	75,743	78,202	78,386	81,287	87,150	92,038	96,636	98,879
	Employer	29,936	33,971	35,759	36,655	36,962	37,922	40,929	43,081	45,127	46,199
	Employee	29,730	33,701	35,312	36,503	36,716	37,720	40,614	42,760	44,804	45,841
	Self-employed	3,500	3,420	3,861	4,114	3,764	4,534	4,534	4,967	5,312	5,526
	Taxation of benefits	661	721	811	930	944	1,111	1,073	1,230	1,393	1,313

Medicare Trust Funds

Hospital Insurance ^a		140,305	154,520	160,896	162,650	159,164	166,977	182,565	194,238	205,289	213,364
	Employer	61,826	67,526	71,181	71,334	69,885	72,760	80,159	84,417	89,093	91,981
	Employee	61,826	67,526	71,181	71,334	69,885	72,760	80,159	84,417	89,093	91,981
	Self-employed	8,655	9,299	9,631	10,040	9,472	10,964	11,065	12,439	13,669	14,732
	Voluntarily enrolled^b	1,447	1,382	1,370	1,626	1,604	1,915	2,416	2,645	2,841	2,938
	Taxation of benefits	6,552	8,787	7,533	8,316	8,318	8,577	8,765	10,319	10,593	11,733

Supplementary Medical Insurance^{a, c}		18,967	20,555	22,764	25,066	27,402	31,435	37,535	42,853	46,773	50,232
	Aged	16,604	17,892	19,905	21,610	23,546	26,737	31,722	36,346	39,676	42,335
	Disabled	2,362	2,664	2,859	3,456	3,856	4,699	5,813	6,507	7,096	7,897

^a Totals do not necessarily equal the sum of rounded components. Employment taxes depend on tax rates, and, for the Old-Age and Survivors Insurance and Disability Insurance Trust Funds, wage bases (taxable maximums). (Beginning in 1994, no wage base applies to Medicare's Hospital Insurance program.) Employer and employee contributions differ by estimated amounts of employee tax overpayments and by employee tax on tips.
^b Beginning in July 1973, aged ineligibles may voluntarily enroll for Hospital Insurance.
^c Includes premiums paid on behalf of eligibles by State governments under "buy-in" arrangements.


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