Contributions to the Social Security and Medicare Trust Funds, by program and source, 2014-2023
(in millions of dollars)

Contributions to the Social Security and Medicare Trust Funds,
by program and source, 2014-2023 (in millions of dollars)
Program and source 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Social Security Trust Funds
Old-Age and Survivors Insurance a $674,584 $710,334 $710,497 $742,399 $750,371 $839,992 $895,014 $875,387 $992,996 $1,103,842
Employer 305,279 322,395 322,652 336,293 340,901 384,005 408,227 398,575 452,446 503,960
Employee 302,850 319,939 319,940 333,542 338,475 381,121 404,962 395,425 448,042 498,593
Self-employed 38,104 37,169 36,195 36,670 36,489 39,966 42,791 44,235 45,436 51,524
General Fund Reimbursement 395 278 87 17 18 11 3 1 b b
Taxation of benefits 27,957 30,554 31,623 35,877 34,488 34,890 39,032 37,151 47,071 49,764
Disability Insurance a 111,488 116,508 158,600 169,063 169,719 140,961 146,997 142,826 162,231 179,972
Employer 51,840 54,747 75,347 79,498 80,576 65,906 69,299 67,677 76,842 85,582
Employee 51,427 54,330 74,887 78,854 79,992 65,222 68,747 67,143 76,096 84,671
Self-employed 6,470 6,312 7,157 8,734 8,617 8,249 7,247 7,547 7,740 8,770
General Fund Reimbursement 71 47 15 3 3 2 b b b b
Taxation of benefits 1,680 1,071 1,194 1,973 530 1,583 1,704 459 1,553 950
Medicare Trust Funds
Hospital Insurance a 248,762 264,489 279,821 289,164 296,082 312,799 319,017 337,164 390,139 406,808
Employer 104,720 112,027 118,309 121,488 125,025 132,889 141,590 140,885 165,418 170,751
Employee 104,720 112,027 118,309 121,488 125,025 132,889 141,590 140,885 165,418 170,751
Self-employed 18,006 17,020 16,899 18,520 18,232 19,359 20,108 20,773 21,979 25,653
Voluntarily enrolledc 3,251 3,206 3,282 3,463 3,608 3,880 4,034 4,181 4,550 4,685
Taxation of benefits 18,066 20,208 23,022 24,206 24,192 23,781 11,695 30,441 32,775 34,968
Supplementary Medical Insurancea, d 65,644 69,446 72,055 81,522 93,312 99,413 111,200 166,626 130,941 131,166
Aged 55,164 58,593 60,618 69,009 80,041 86,101 97,120 145,994 115,756 117,685
Disabled 10,479 10,852 11,438 12,513 13,271 13,312 14,081 20,632 15,186 13,481
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.