FICA is a payroll tax that funds Social Security and Medicare

FICA stands for the Federal Insurance Contributions Act. It is a payroll tax taken directly from your paycheck. The money goes into two separate trust funds: one for Social Security and one for Medicare. Your employer also pays a matching amount on your behalf, though you do not see that money — it comes from the employer's side of the ledger.

FICA is not optional and not income tax. It is a dedicated tax for two specific programs. If you work as an employee, your employer withholds FICA automatically. If you are self-employed, you pay both the employee and employer portions yourself, called self-employment tax.

The amount withheld depends on your gross pay — the total before any deductions. FICA is calculated on earnings up to a cap that changes each year. For 2024, that cap is $168,600, meaning you stop paying Social Security tax once you earn above that amount. Medicare tax has no cap and continues on all earnings.

Key Takeaways

  • FICA has two parts: 6.2% goes to Social Security and 2.9% goes to Medicare, taken from each paycheck.
  • Your employer pays an equal amount (6.2% Social Security, 2.9% Medicare) that does not appear on your stub but funds the same programs.
  • Self-employed people pay both the employee and employer portions, totaling 15.3% of net self-employment income.
  • Social Security tax stops once you reach the annual earnings cap, but Medicare tax continues on all income with no limit.
  • FICA withholding is separate from federal income tax and cannot be avoided if you have employment income.

How much FICA comes out of your paycheck

The employee portion of FICA is split into two rates. Social Security tax is 6.2% of your gross pay. Medicare tax is 2.9% of your gross pay. Together, that is 15.3% of your earnings — but only 15.3% of what you actually earn, not 15.3% of your gross pay. The math works like this: if you earn $1,000 in a pay period, FICA takes $62 for Social Security and $29 for Medicare, totaling $91.

The Social Security portion stops once your year-to-date earnings reach the cap. In 2024, that cap is $168,600. Once you cross that threshold, no more Social Security tax is withheld for the rest of that calendar year. Medicare tax, by contrast, continues on every dollar you earn with no upper limit.

There is also an additional Medicare tax of 0.9% that applies if your income exceeds certain thresholds. For single filers, that threshold is $200,000. For married couples filing jointly, it is $250,000. This additional tax is withheld on earnings above those amounts and is not matched by your employer.

Where the money actually goes

Social Security tax funds the Social Security program, which pays retirement benefits, survivor benefits (for spouses and children of deceased workers), and disability benefits. The money does not sit in an account with your name on it. Instead, current workers' taxes pay current retirees' benefits. When you retire, future workers' taxes will pay your benefit.

Medicare tax funds the Medicare program, which provides health insurance for people age 65 and older, some younger people with disabilities, and people with end-stage renal disease. Like Social Security, it operates on a pay-as-you-go basis. Your Medicare tax today funds today's Medicare beneficiaries.

Both trust funds are managed by the federal government. The Social Security Administration oversees Social Security, and the Centers for Medicare & Medicaid Services oversees Medicare. Neither program is optional, and neither allows you to opt out or redirect your contributions.

Why employers pay FICA too

Your employer withholds FICA from your paycheck, but they also pay an equal amount directly to the government. This employer match is 6.2% for Social Security and 2.9% for Medicare — the same rates as the employee portion. The employer contribution does not reduce your paycheck; it is a separate business expense.

This means the total FICA cost for an employer is 15.3% of payroll (plus the additional 0.9% Medicare tax on high earners). From the government's perspective, both the employee and employer portions fund the same trust funds. The split exists for accounting purposes, but the money all goes to the same place.

Self-employed people do not have an employer to match their contributions, so they pay both portions themselves. This is called self-employment tax and totals 15.3% of net self-employment income. Self-employed people can deduct half of their self-employment tax as a business expense when filing income taxes, which provides some offset.

FICA versus federal income tax

FICA and federal income tax are two separate withholdings. FICA is a fixed percentage that goes to Social Security and Medicare. Federal income tax is calculated based on your W-4 form and depends on your filing status, number of dependents, and other factors. You will see both listed separately on your pay stub.

FICA is mandatory and the same for everyone at the same income level. Federal income tax withholding varies based on your personal situation. You can adjust your federal income tax withholding by filing a new W-4 with your employer, but you cannot change your FICA withholding — it is set by law.

Some people confuse the two because they both come out of paychecks. The key difference: FICA funds two specific programs (Social Security and Medicare), while federal income tax funds general government operations. FICA has a cap on Social Security earnings; federal income tax does not.

What happens if you work multiple jobs

If you work more than one job, FICA is withheld from each paycheck separately. This means you could pay Social Security tax above the annual cap if your combined earnings from all jobs exceed the cap. For example, if you earn $100,000 at one job and $80,000 at another, you will pay Social Security tax on both, totaling $180,000 in taxable earnings even though the cap is $168,600.

When you file your tax return, you can claim a credit for excess Social Security tax paid. The IRS will refund the overpayment when you file, so you do not lose money permanently. However, you have to wait until tax time to get it back. Medicare tax has no cap, so there is no overpayment issue with multiple jobs.

To avoid overpaying Social Security tax, you can request that your employer withhold less from one job if you know your combined earnings will exceed the cap. This requires coordination between employers and is not automatic.

How FICA connects to your future benefits

FICA withholding creates a record of your earnings history. The Social Security Administration tracks how much you paid in Social Security tax over your working years. When you reach retirement age, your benefit amount is calculated based on your 35 highest-earning years. The more you paid in, the higher your benefit will be (up to a maximum).

For Medicare, FICA contributions establish your coverage. If you paid Medicare tax for at least 10 years (40 quarters), you are may have access to to Medicare Part A (hospital insurance) at age 65 with no premium. If you did not pay enough, you can still buy into Medicare, but you will pay higher premiums.

FICA is not a savings account. You do not build up a balance that you can withdraw or pass to heirs. It is a tax that funds current benefits for current beneficiaries. Your future benefit depends on the program's solvency and the rules in place when you retire, not on the amount you paid in.

Frequently Asked Questions

Can I get FICA tax back if I overpaid?

Yes, but only for Social Security tax overpayment from multiple jobs. When you file your tax return, the IRS calculates whether you paid more than the annual cap and issues a refund. Medicare tax overpayment is not refunded because there is no cap. Federal income tax overpayment is handled separately and depends on your W-4 and total tax liability.

What if I did not pay FICA because I was paid under the table?

Unreported income means no FICA record is created. This affects your Social Security and Medicare may be able to access later. You can file amended tax returns to report the income and pay back taxes plus penalties, which will add to your earnings record. The Social Security Administration can sometimes accept late reports if you have other documentation of the work.

Do I pay FICA on tips?

Yes. Tips are considered wages and are subject to FICA tax. Your employer should withhold FICA on tips you report. If you receive cash tips that you do not report, those earnings do not create a FICA record and do not count toward Social Security or Medicare.

Why does FICA stop at a certain income level for Social Security?

The cap exists because Social Security was designed as a social insurance program with a wage-replacement benefit structure, not a flat benefit. Higher earners receive higher benefits, but the benefit formula is progressive — it replaces a smaller percentage of high earners' income. The cap reflects a policy choice about how much income should be subject to the tax.

If I am self-employed, can I avoid FICA?

No. Self-employed people pay self-employment tax, which is FICA's equivalent. It is 15.3% of net self-employment income (after business expenses). You can deduct half of it as a business expense, which reduces your federal income tax, but you cannot avoid the tax itself if you have self-employment income above $400 per year.