Contributions by Program & Source

Contributions to the Social Security and Medicare Trust Funds,
by program and source, 2002-2011 (in millions of dollars)
Program and source		2002	2003	2004	2005	2006	2007	2008	2009	2010	2011

Social Security Trust Funds

Old-Age and Survivors Insurance ^a		$468,108	$468,574	$486,726	$520,706	$550,415	$578,069	$590,122	$590,322	$569,018	$592,314
	Employer	215,897	217,675	223,311	241,018	253,705	265,753	272,060	269,586	257,245	271,395
	Employee	215,039	216,222	222,118	239,163	251,813	263,856	269,956	267,440	257,893	184,227
	Self-employed	24,262	22,179	26,703	26,682	29,269	31,269	32,540	33,366	29,635	26,728
	General Fund Reimbursement	1	^b	^b	^b	^b	^b	^b	^b	2,155	87,753
	Taxation of benefits	12,909	12,497	14,593	13,843	15,628	17,192	15,566	19,930	22,090	22,211

Disability Insurance ^a		78,202	78,386	81,287	87,150	92,038	96,636	98,879	98,820	94,728	98,389
	Employer	36,655	36,962	37,922	40,929	43,081	45,127	46,199	45,783	43,684	46,086
	Employee	36,503	36,716	37,720	40,614	42,760	44,804	45,841	45,418	43,794	31,259
	Self-employed	4,114	3,764	4,534	4,534	4,967	5,312	5,526	5,664	5,034	4,537
	General Fund Reimbursement	^b	^b	^b	^b	^b	^b	^b	^b	366	14,927
	Taxation of benefits	930	944	1,111	1,073	1,230	1,393	1,313	1,955	1,852	1,581

Medicare Trust Funds

Hospital Insurance ^a		162,650	159,164	166,977	182,565	194,238	205,289	213,364	206,173	199,102	214,003
	Employer	71,334	69,885	72,760	80,159	84,417	89,093	91,981	88,242	84,397	91,381
	Employee	71,334	69,885	72,760	80,159	84,417	89,093	91,981	88,242	84,397	91,381
	Self-employed	10,040	9,472	10,964	11,065	12,439	13,669	14,732	14,405	13,238	12,830
	Voluntarily enrolled^c	1,626	1,604	1,915	2,416	2,645	2,841	2,938	2,908	3,310	3,267
	Taxation of benefits	8,316	8,318	8,577	8,765	10,319	10,593	11,733	12,376	13,760	15,143

Supplementary Medical Insurance^{a, d}		25,066	27,402	31,435	37,535	42,853	46,773	50,232	56,040	51,986	57,514
	Aged	21,610	23,546	26,737	31,722	36,346	39,676	42,335	47,433	43,168	47,646
	Disabled	3,456	3,856	4,699	5,813	6,507	7,096	7,897	8,606	8,818	9,868

^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 Between -$500,000 and $500,000.
^c Beginning in July 1973, aged ineligibles may voluntarily enroll for Hospital Insurance.
^d Includes premiums paid on behalf of eligibles by State governments under "buy-in" arrangements.


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