FICA is two separate payroll taxes that fund Social Security and Medicare

FICA stands for the Federal Insurance Contributions Act. It is not income tax — it is two distinct payroll taxes that come out of your paycheck. One funds Social Security; the other funds Medicare. Together they are called FICA, but they work differently, have different rates, and have different caps on how much you pay.

When you see your pay stub, FICA appears as two line items: Social Security tax and Medicare tax. Your employer withholds both from your gross pay before you receive your check. If you are self-employed, you pay both yourself when you file taxes. The money does not go into a general federal fund — it goes into trust accounts that pay current beneficiaries and cover program costs.

FICA is mandatory for almost all workers. Unlike income tax, which varies based on your filing status and deductions, FICA is a flat percentage applied to your wages with one important exception: Social Security tax stops once you hit an annual earnings cap, while Medicare tax does not.

Key Takeaways

  • FICA consists of two taxes: Social Security (6.2% of wages) and Medicare (1.45% of wages), each with a separate purpose and funding mechanism.
  • Your employer withholds FICA from your paycheck and sends it to the U.S. Treasury; self-employed people pay both the employee and employer portions themselves.
  • Social Security tax stops once you earn above a certain threshold each year, but Medicare tax continues on all wages with no cap.
  • FICA is separate from federal income tax and is calculated the same way regardless of your tax bracket, filing status, or deductions.
  • High earners pay an additional 0.9% Medicare tax on wages above a threshold that depends on your filing status.

Social Security tax: 6.2% up to an annual earnings cap

The Social Security portion of FICA is 6.2% of your wages. Your employer withholds this amount and matches it — meaning your employer also pays 6.2% on your behalf. If you are self-employed, you pay both portions yourself, for a total of 12.4%.

Social Security tax only applies to wages up to a certain threshold. In 2024, that threshold is $168,600. Once you earn above that amount in a single year, no more Social Security tax is withheld from your remaining paychecks that year. This cap changes annually based on wage growth. The money collected funds Social Security benefits for retirees, disabled workers, and survivors of deceased workers.

Because of this cap, high earners pay a smaller percentage of their total income in Social Security tax than lower-wage workers do. A person earning $50,000 pays 6.2% on all $50,000. A person earning $500,000 pays 6.2% only on the first $168,600, then nothing on the remaining $331,400.

Medicare tax: 1.45% with no earnings cap, plus an extra 0.9% for high earners

The Medicare portion of FICA is 1.45% of your wages, with no annual cap. You pay it on every dollar you earn, no matter how much you make. Your employer withholds 1.45% and matches it. If you are self-employed, you pay both portions for a total of 2.9%.

There is an additional Medicare tax of 0.9% that applies only to high earners. This extra tax kicks in when your wages exceed $200,000 (if you file as single), $250,000 (if you file as married filing jointly), or $125,000 (if you file as married filing separately). Unlike the base Medicare tax, the additional 0.9% is not matched by employers — you pay it entirely yourself. Your employer still withholds it from your paycheck, but it does not reduce your employer's tax burden.

The Medicare tax funds Medicare Part A (hospital insurance) and contributes to the overall Medicare trust fund. Because there is no earnings cap, high earners pay Medicare tax on a much larger portion of their income than they pay Social Security tax.

How FICA differs from federal income tax

FICA and federal income tax are often confused because both appear on your pay stub and both are withheld by your employer. But they are completely separate systems with different rules, rates, and purposes.

Federal income tax is progressive — the rate depends on your tax bracket, which is determined by your total income and filing status. FICA is flat — the rate is the same for everyone, regardless of income level or filing status. A person earning $30,000 and a person earning $300,000 both pay 6.2% Social Security tax on their may be able to access wages (though the high earner hits the cap sooner).

Federal income tax funds general government operations: defense, infrastructure, federal agencies, and other programs. FICA funds only Social Security and Medicare. Federal income tax can be reduced through deductions and credits. FICA cannot — it is calculated on gross wages before deductions.

When you file your tax return, you report federal income tax withheld separately from FICA taxes withheld. If too much was withheld, you get a refund; if too little, you owe. FICA withholding is not adjusted based on your tax return — it is final when it is withheld.

Self-employed workers pay both the employee and employer portions

If you are self-employed, you pay FICA yourself rather than having an employer withhold it. You pay both the employee portion and the employer portion, which means your total FICA rate is double what a wage earner pays: 12.4% for Social Security (up to the annual cap) and 2.9% for Medicare (with no cap).

Self-employed people calculate FICA using Schedule SE (Self-Employment Tax), which is filed with their tax return. The calculation is based on your net self-employment income — your business income minus business expenses. You can deduct half of your self-employment tax as a business expense on your tax return, which reduces your taxable income slightly, but you still pay the full amount.

Self-employed FICA is due when you file your tax return, typically by April 15. Many self-employed people make quarterly estimated tax payments that include FICA, so they do not owe a large lump sum in April.

FICA withholding on your pay stub and what it means

On a typical pay stub, you will see a line for "Social Security" and a line for "Medicare" under the FICA section. The Social Security line shows 6.2% of your gross pay (or zero if you have already hit the annual cap). The Medicare line shows 1.45% of your gross pay, plus an additional 0.9% if you are a high earner.

These amounts are withheld before you receive your paycheck. They reduce your take-home pay but do not reduce your taxable income for federal income tax purposes — you still owe federal income tax on your full gross wages. FICA is withheld on top of federal income tax, not instead of it.

If you work for more than one employer in the same year, each employer withholds Social Security tax independently. It is possible to overpay Social Security tax if your combined wages from all employers exceed the annual cap. When you file your tax return, you can claim a credit for the overpayment and receive a refund. Medicare tax does not have this issue because there is no cap.

Why FICA exists and how it funds benefits

FICA was created in 1935 as part of the Social Security Act. The idea was to create a dedicated funding mechanism for Social Security and later Medicare, separate from general tax revenue. Workers and employers contribute during working years, and those contributions fund benefits for current retirees and disabled workers.

Social Security is not a savings account — your FICA contributions do not sit in an account with your name on it. Instead, current workers' contributions pay current beneficiaries' benefits. When you retire, future workers' contributions will pay your benefits. This is called a pay-as-you-go system.

Medicare operates similarly. Your Medicare tax contributions fund benefits for current Medicare beneficiaries. The system is designed so that each generation of workers funds the generation ahead of them.

Frequently Asked Questions

What happens to my FICA taxes if I change jobs?

Your FICA contributions continue with each new employer. Each employer withholds FICA independently based on your wages at that job. If your combined wages from multiple employers exceed the Social Security cap, you may overpay Social Security tax — you can claim a credit on your tax return to recover the overpayment. Medicare tax has no cap, so no overpayment is possible.

Do I pay FICA on tips, bonuses, and other forms of compensation?

Yes. FICA applies to all wages and compensation, including tips, bonuses, commissions, and most fringe benefits. The only common exceptions are certain employer-provided benefits like health insurance premiums paid pre-tax. Your employer should include all taxable compensation when calculating FICA withholding.

Can I opt out of paying FICA?

No. FICA is mandatory for nearly all workers. The only exceptions are certain religious groups and some government employees hired before specific dates. If you are a typical employee or self-employed person, you cannot opt out of FICA contributions.

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

FICA funds not only retirement benefits but also disability benefits and survivor benefits for your family if you become disabled or die. Even if you do not collect retirement benefits, your contributions may support your family or fund your own disability benefits. Additionally, FICA is a legal requirement, not a voluntary investment.

Is FICA the same as payroll tax?

FICA is a type of payroll tax, but not all payroll taxes are FICA. Payroll tax is a broad term that includes FICA (Social Security and Medicare) plus federal income tax withholding and state and local taxes. FICA is the specific portion that funds Social Security and Medicare.