FICA is calculated as a percentage of your gross pay, taken out before you see your paycheck

FICA (Federal Insurance Contributions Act) taxes are calculated by multiplying your gross income by a set percentage. For 2024, the rate is 15.3% total: 12.4% for Social Security and 2.9% for Medicare. Your employer withholds half (7.65%) from your paycheck, and you pay the other half through payroll deduction — though if you're self-employed, you pay the full 15.3% yourself.

The calculation happens on your gross pay, meaning the full amount you earn before any other deductions. If you earn $1,000 in a week, FICA is calculated on that $1,000, not on what remains after health insurance or 401(k) contributions come out. The Social Security portion stops once you hit an annual earnings cap — in 2024 that cap is $168,600 — but Medicare continues on all income with no limit.

Your employer is required to calculate and withhold FICA each pay period. The amount appears on your pay stub as "FICA" or sometimes broken out as "Social Security" and "Medicare." If your employer makes a mistake in the calculation, you can ask payroll to correct it, and you can verify the amounts against your W-2 at year-end.

Key Takeaways

  • FICA is 15.3% of your gross pay: 12.4% for Social Security and 2.9% for Medicare, split between you and your employer.
  • Your employer withholds your half (7.65%) directly from your paycheck before you receive it.
  • The Social Security portion stops once you earn $168,600 in a year, but Medicare continues on all income.
  • Self-employed people pay the full 15.3% themselves, though they can deduct half of it as a business expense on their tax return.
  • FICA is calculated on your gross income, not on what's left after other deductions like health insurance or retirement contributions.

Why the Social Security portion has an earnings cap

Social Security is designed as an insurance program where benefits are tied to what you paid in. The earnings cap exists because Social Security benefits max out — even if you earn $500,000 a year, your benefit at retirement won't be proportionally higher. The program stops collecting tax on income above the cap because that income wouldn't increase your eventual benefit.

The cap changes each year based on wage growth. In 2023 it was $160,200; in 2024 it's $168,600. If you change jobs mid-year and both employers withhold Social Security tax on your full earnings, you'll have overpaid. You can claim the overpayment as a credit on your tax return, and the IRS will refund it.

Medicare has no earnings cap. You pay 2.9% on every dollar you earn, no matter how much. High earners also pay an additional 0.9% Medicare tax on income above $200,000 (single) or $250,000 (married filing jointly), which is withheld separately and shows up on your pay stub as "Additional Medicare Tax."

How FICA changes if you have multiple jobs

Each employer calculates FICA independently on the wages they pay you. If you earn $100,000 at Job A and $80,000 at Job B, Job A withholds Social Security tax on the full $100,000, and Job B withholds on the full $80,000 — even though your combined income exceeds the annual cap.

This means you may overpay Social Security tax in a year when you have multiple jobs. When you file your tax return, you report all wages and the IRS calculates what you should have paid. If you overpaid, you get a refund; if you underpaid, you owe the difference. The overpayment credit appears on your Form 1040 as "excess Social Security tax withheld."

To avoid overpaying, you can ask one employer to withhold extra federal income tax, which reduces your refund but doesn't solve the FICA overpayment problem directly. The only real solution is to wait until tax time and claim the credit.

FICA for self-employed people and contractors

If you're self-employed, you pay FICA through self-employment tax, which is calculated on your net business income (revenue minus business expenses). The rate is 15.3%, the same as the combined employee and employer portions, because you're both the worker and the employer.

Self-employment tax is calculated on Schedule SE, a form you file with your tax return. You report your net profit from self-employment, multiply it by 92.35% (to account for the employer-side deduction), and then apply the 15.3% rate. The result goes on your Form 1040 as self-employment tax.

The Social Security portion of self-employment tax also has the annual earnings cap. Once your net self-employment income reaches $168,600 in 2024, you stop paying the 12.4% Social Security portion but continue paying the 2.9% Medicare portion on all remaining income. You can deduct half of your self-employment tax as a business expense, which lowers your taxable income.

What happens to FICA money after it's withheld

Your employer sends the FICA taxes withheld from your paycheck, plus their matching contribution, to the U.S. Treasury. The Social Security portion funds current Social Security benefits for retirees, disabled workers, and survivors. The Medicare portion funds Medicare Part A (hospital insurance). These are not savings accounts in your name — the money goes into a general fund that pays current beneficiaries.

Your FICA contributions are tracked by the Social Security Administration under your Social Security number. When you reach retirement age, your benefit is calculated based on your earnings history and the amount you paid in over your working years. The more you earned and paid in, the higher your benefit, up to the maximum.

You can view your earnings record and estimated benefits on the Social Security Administration website using your personal account. This record shows how much FICA tax was credited to your account each year, so you can verify it's accurate.

FICA withholding on different types of income

FICA applies to wages, salaries, and tips — basically any compensation for work. It does not apply to investment income, interest, dividends, capital gains, or rental income. It also does not apply to certain fringe benefits like employer-provided health insurance or contributions to a traditional 401(k).

Some income is exempt from FICA entirely. Students employed by their school, certain religious workers, and some government employees may not pay FICA. If you're not sure whether your income is subject to FICA, ask your employer or payroll department — they're required to know and withhold correctly.

Bonuses, commissions, and overtime are all subject to FICA at the same rate as regular wages. If you receive a large bonus, your employer withholds FICA on it just like any other paycheck. There's no special treatment for lump-sum payments.

Verifying FICA calculations on your pay stub

Your pay stub should show FICA withheld as a line item, usually broken out as "Social Security" and "Medicare" or labeled simply as "FICA." To verify the amount is correct, multiply your gross pay by 7.65% — that's your employee portion. The result should match what appears on your stub.

If you see a discrepancy, check whether you've already hit the Social Security earnings cap for the year. If you have, Social Security tax should stop but Medicare should continue. If the numbers still don't match, contact your payroll department and ask them to review the calculation.

Keep your pay stubs throughout the year. When you receive your W-2 in January, verify that the total FICA withheld matches the sum of all your pay stubs. The W-2 is your official record for tax filing, and it should be accurate.

Frequently Asked Questions

What's the difference between FICA and income tax withholding?

FICA and federal income tax are two separate withholdings. FICA is always 7.65% (employee portion) and funds Social Security and Medicare. Income tax withholding varies based on your W-4 form and your tax bracket. Both come out of your paycheck, but they fund different programs and are calculated differently.

Can I opt out of paying FICA?

No. FICA is mandatory for all employees and self-employed people with earned income above a certain threshold. Some religious groups have exemptions, and certain government employees may not participate, but these are rare exceptions. If you work and earn wages, FICA is withheld.

Why do I pay FICA if I might not collect Social Security?

FICA funds not just retirement benefits but also disability insurance and survivor benefits. If you become disabled before retirement age, you may receive Social Security Disability Insurance. If you die, your family may receive survivor benefits. These are part of what your FICA contributions fund, regardless of whether you live to collect retirement benefits.

Does FICA get refunded if I don't use Social Security or Medicare?

No. FICA is a tax, not a savings account. You don't get a refund of FICA taxes if you don't use the benefits. However, if you're not a U.S. citizen and you leave the country, you may be able to request a refund of your contributions under certain circumstances — this is rare and requires specific documentation.

How do I know if I've paid enough FICA to may have access to for benefits?

Social Security requires 40 credits to may have access to for retirement benefits. You earn one credit for each $1,730 of earnings in 2024 (the amount changes yearly), up to four credits per year. You can check your earnings record and estimated credits on the Social Security Administration website using your personal account.