Social Security is funded through a “pay-as-you-go” system where current workers pay taxes that are immediately used to fund benefits for current retirees, survivors, and the disabled. For the 2026 tax year, the system relies on three primary revenue streams:

1. Dedicated Payroll Taxes (FICA and SECA)

The vast majority of Social Security’s funding comes from payroll taxes under the Federal Insurance Contributions Act (FICA) for employees or the Self-Employment Contributions Act (SECA) for those who work for themselves.

  • The Rate: Employers and employees each pay 6.2% (a total of 12.4%) into the Social Security pot.
  • The 2026 Wage Base: This tax only applies to earnings up to a certain limit, which the Social Security Administration has set at $184,500 for 2026. Any income earned above this “taxable maximum” is not subject to Social Security taxes.
  • Self-Employed: Individuals who are self-employed pay the full 12.4% themselves, though they are permitted to deduct the “employer” half on their federal income tax return.

2. Taxation of Benefits

A second source of revenue comes from the beneficiaries themselves. If you are a high-income retiree, up to 85% of your Social Security benefits may be subject to federal income tax. The IRS funnels this specific tax revenue back into the Social Security Trust Funds to help pay for current and future benefits.

3. Interest on Trust Fund Reserves

For decades, Social Security collected more in tax revenue than it paid out in benefits, resulting in a surplus. This surplus is held in two legally distinct trust funds: the Old-Age and Survivors Insurance (OASI) fund and the Disability Insurance (DI) fund.

  • By law, these funds must be invested in special-issue U.S. Treasury bonds.
  • These bonds earn interest, which serves as the third source of income for the program.

4. The 2026 Funding Reality

In 2026, the program is in a transitional phase. Because the “Baby Boomer” generation is retiring in large numbers, the tax revenue from current workers is no longer sufficient to cover the total cost of benefits. To bridge this gap, the Social Security Administration is “redeeming” the Treasury bonds held in the trust funds.

  • Current projections from the 2025 Trustees Report suggest the combined trust funds will be able to pay 100% of scheduled benefits until roughly 2034 or 2035.
  • After the reserves are depleted, the program will rely solely on incoming tax revenue, which is estimated to be enough to pay approximately 77% to 83% of scheduled benefits unless Congress acts to change the funding structure.

Source: Social Security Administration (SSA), “How is Social Security Financed?” (2026 Update); and AARP, “Social Security Trust Fund FAQ.”