FICA is the payroll tax that funds Social Security and Medicare

FICA stands for the Federal Insurance Contributions Act. It is a payroll tax taken from your paycheck to fund two federal programs: Social Security and Medicare. You see FICA taxes listed on your pay stub as two separate line items — one for Social Security and one for Medicare — even though they come from the same law.

If you work as an employee, your employer withholds FICA taxes from your paycheck automatically. If you are self-employed, you pay FICA taxes yourself when you file your tax return, though the calculation works differently. Either way, the money goes directly to the U.S. Treasury to pay current benefits and build the trust funds that back these programs.

FICA is different from income tax. Income tax is withheld based on your W-4 form and goes to general federal revenue. FICA taxes are fixed percentages that do not change based on your filing status or deductions — they are the same whether you earn $30,000 or $300,000, up to a certain income limit.

Key Takeaways

  • FICA taxes fund Social Security retirement, disability, and survivor benefits, plus Medicare hospital insurance.
  • Employees pay 6.2% for Social Security and 1.45% for Medicare; employers match these amounts.
  • Self-employed people pay both the employee and employer share, totaling 15.3% on net earnings from self-employment.
  • Social Security tax stops once you reach the annual wage cap, but Medicare tax continues on all income.
  • FICA withholding appears on your pay stub and is separate from federal income tax withholding.

How much FICA tax comes out of your paycheck

As an employee, you pay 6.2% of your gross wages for Social Security and 1.45% for Medicare. Your employer pays an equal amount on your behalf — 6.2% for Social Security and 1.45% for Medicare. This employer match does not show up in your take-home pay, but it is part of your total compensation and is reported to the IRS.

The Social Security portion stops once your wages hit an annual cap. In 2024, that cap is $168,600, meaning no Social Security tax is withheld on earnings above that amount. Medicare tax, however, has no cap — you pay 1.45% on all wages no matter how much you earn. High-income earners also pay an additional 0.9% Medicare tax on wages over $200,000 (single filers) or $250,000 (married filing jointly).

Your pay stub will show these withholdings separately. Look for lines labeled "Social Security" or "OASDI" (Old-Age, Survivors, and Disability Insurance) and "Medicare" or "HI" (Hospital Insurance). The amounts withheld are non-negotiable — you cannot choose to pay less or opt out.

What FICA taxes pay for

The 6.2% Social Security tax funds three types of benefits: retirement benefits for workers age 62 and older, disability benefits for workers who cannot work due to a medical condition, and survivor benefits for the spouses and children of workers who die. These are not savings accounts in your name — the tax you pay today funds benefits for current retirees and disabled workers.

The 1.45% Medicare tax funds Part A hospital insurance, which covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health services. It does not fund Medicare Part B (doctor visits and outpatient care) or Part D (prescription drugs), which are funded through general tax revenue and beneficiary premiums.

When you reach retirement age or become disabled, you become may be able to access to draw from these programs based on your work history and the amount you contributed. The amount you receive is not a direct return of what you paid — it is calculated using a formula that accounts for your earnings record and when you claim benefits.

FICA taxes if you are self-employed

If you are self-employed, you pay both the employee and employer share of FICA taxes. This is called self-employment tax, and it totals 15.3% — 12.4% for Social Security and 2.9% for Medicare. You calculate it on your net earnings from self-employment (your business income minus business expenses) using Schedule SE, which you file with your Form 1040.

You can deduct half of your self-employment tax as a business expense on your tax return, which reduces your taxable income. This deduction roughly mirrors the fact that an employee does not pay income tax on the employer's matching contribution. Even with this deduction, self-employed people pay significantly more FICA tax than employees because they cover both sides.

Self-employment tax is due when you file your tax return, usually April 15. If you expect to owe $1,000 or more in self-employment tax for the year, you may need to make quarterly estimated tax payments to avoid penalties. The Social Security portion still stops at the annual wage cap, but Medicare tax continues on all net self-employment income.

How FICA withholding appears on your pay stub

Your pay stub breaks down FICA taxes into two line items. One shows the Social Security tax withheld (usually labeled "Social Security" or "OASDI"), and another shows the Medicare tax withheld (usually labeled "Medicare" or "HI"). Both are listed under deductions and reduce your take-home pay.

You will also see the employer's matching contribution listed separately, often in a section labeled "employer taxes" or "employer contributions." This amount does not come out of your paycheck — it is paid by your employer directly to the IRS — but it is part of your total earnings record and counts toward your future Social Security and Medicare benefits.

If you have multiple jobs, each employer withholds FICA taxes independently. This can result in overpaying Social Security tax if your combined wages exceed the annual cap. You can claim a credit for the overpayment when you file your tax return, but you cannot avoid the withholding at the time of payment.

The difference between FICA and income tax withholding

FICA taxes and federal income tax withholding are two separate deductions from your paycheck, and they fund different programs. FICA is a fixed percentage (6.2% for Social Security, 1.45% for Medicare) that does not change based on your personal situation. Income tax withholding is based on the W-4 form you complete with your employer and varies based on your filing status, number of dependents, and other factors.

Income tax goes to general federal revenue and is used for all federal spending — defense, infrastructure, interest on the national debt, and so on. FICA taxes go specifically to Social Security and Medicare trust funds. You can adjust your income tax withholding by submitting a new W-4 to your employer, but you cannot adjust FICA withholding — it is automatic and mandatory.

When you file your tax return, you report both FICA and income tax withholding. If you overpaid income tax during the year, you may receive a refund. FICA taxes do not work the same way — any overpayment (such as from multiple jobs) is credited to your Social Security account, not refunded as cash.

Why FICA taxes have an income cap for Social Security

The Social Security portion of FICA taxes stops once your annual wages reach a certain level. This cap exists because Social Security benefits are designed to replace a portion of your pre-retirement income, not to provide unlimited benefits. The cap is adjusted each year based on wage growth in the economy.

High earners pay the same maximum Social Security tax as middle-income workers, but they do not receive proportionally higher benefits. This structure makes Social Security more progressive — it provides a larger income replacement rate for lower-wage workers. Medicare tax, by contrast, has no cap and continues on all income, which is why high earners pay more Medicare tax overall.

The wage cap means that if you earn $200,000 in a year, you pay Social Security tax only on the first $168,600 (the 2024 cap). The remaining $31,400 is not subject to Social Security tax, though it is still subject to Medicare tax and income tax withholding.

Frequently Asked Questions

Can I opt out of paying FICA taxes?

No. FICA taxes are mandatory for all employees and self-employed people. The only exceptions are certain religious groups that have received IRS approval to be exempt, and some government employees hired before specific dates who are covered under different retirement systems. Most workers have no option to avoid FICA withholding.

What happens to FICA taxes if I change jobs?

Each employer withholds FICA taxes independently based on your wages at that job. If you work multiple jobs in the same year and your combined wages exceed the Social Security cap, you will overpay Social Security tax. You can claim a credit for the overpayment on your tax return, but the withholding happens automatically at each job.

Do I get back the FICA taxes I paid?

You do not receive a refund of FICA taxes. Instead, the money funds current Social Security and Medicare benefits, and your contributions build your own benefit record. When you retire or become disabled, you draw benefits based on your earnings history, not the exact amount you paid in.

Why do I pay FICA tax on income I do not receive?

If your employer withholds more FICA tax than you owe (for example, from multiple jobs), you do not receive a cash refund. Instead, the overpayment is credited to your Social Security earnings record. You can claim the overpayment as a credit on your tax return, which reduces your income tax liability.

Does FICA tax explore to all types of income?

FICA taxes explore to wages and self-employment income. They do not explore to investment income, interest, dividends, capital gains, or rental income (unless you are in the rental business). Certain types of compensation, such as employer-provided health insurance premiums, are also exempt from FICA taxes.