Contributions by Program & Source

Contributions to the Social Security and Medicare Trust Funds,
by program and source, 1998-2007 (in millions of dollars)
Program and source		1998	1999	2000	2001	2002	2003	2004	2005	2006	2007

Social Security Trust Funds

Old-Age and Survivors Insurance ^a		$380,112	$407,023	$432,976	$453,354	$468,107	$468,574	$486,726	$520,706	$550,414	$578,069
	Employer	176,564	188,461	200,431	210,659	215,897	217,675	223,311	241,018	253,705	265,753
	Employee	174,786	187,160	198,736	207,999	215,039	216,222	222,118	239,163	251,813	263,856
	Self-employed	19,614	20,503	22,216	22,793	24,262	22,179	26,703	26,682	29,269	31,269
	Taxation of benefits	9,149	10,899	11,594	11,903	12,909	12,497	14,593	13,843	15,628	17,192

Disability Insurance ^a		59,486	63,828	71,812	75,743	78,202	78,386	81,287	87,150	92,038	96,636
	Employer	28,064	29,936	33,971	35,759	36,655	36,962	37,922	40,929	43,081	45,127
	Employee	27,772	29,730	33,701	35,312	36,503	36,716	37,720	40,614	42,760	44,804
	Self-employed	3,091	3,500	3,420	3,861	4,114	3,764	4,534	4,534	4,967	5,312
	Taxation of benefits	558	661	721	811	930	944	1,111	1,073	1,230	1,393

Medicare Trust Funds

Hospital Insurance ^a		130,699	140,305	154,520	160,896	162,650	159,164	166,977	182,565	194,238	205,289
	Employer	57,849	61,826	67,526	71,181	71,334	69,885	72,760	80,159	84,417	89,093
	Employee	57,849	61,826	67,526	71,181	71,334	69,885	72,760	80,159	84,417	89,093
	Self-employed	8,619	8,655	9,299	9,631	10,040	9,472	10,964	11,065	12,439	13,669
	Voluntarily enrolled^b	1,316	1,447	1,382	1,370	1,626	1,604	1,915	2,416	2,645	2,841
	Taxation of benefits	5,067	6,552	8,787	7,533	8,316	8,318	8,577	8,765	10,319	10,593

Supplementary Medical Insurance^{a, c}		20,933	18,967	20,555	22,764	25,066	27,402	31,435	37,535	42,853	46,773
	Aged	18,594	16,604	17,892	19,905	21,610	23,546	26,737	31,722	36,346	39,676
	Disabled	2,338	2,362	2,664	2,859	3,456	3,856	4,699	5,813	6,507	7,096

^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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