FICA takes 15.3% of your wages in total, split between you and your employer

FICA is two separate payroll taxes: Social Security at 6.2% and Medicare at 2.9%. Your employer pays an equal 6.2% and 2.9%, so the total burden is 15.3% of your wages. You see only your half (8.85%) deducted from your paycheck, but the employer's half is a real cost to them and affects how much they can pay you.

The amount you pay depends on how much you earn. Social Security stops taking money once you hit a wage cap — in 2024 that cap is $168,600, meaning someone earning $200,000 pays Social Security tax only on the first $168,600. Medicare has no wage cap, so it takes 2.9% of every dollar you earn, no matter how high your income goes. If you earn over $200,000 as a single filer (or $250,000 married filing jointly), you pay an additional 0.9% Medicare tax on the excess.

FICA is separate from federal income tax. Income tax is withheld based on your W-4 form and depends on your tax bracket. FICA is automatic and the same percentage for everyone — it does not change based on how many dependents you claim or your filing status.

Key Takeaways

  • You pay 8.85% of your gross wages in FICA (6.2% Social Security plus 2.9% Medicare), and your employer pays an equal amount.
  • Social Security tax stops once you earn $168,600 in a calendar year, but Medicare tax continues on every dollar you earn.
  • If you earn over $200,000 (single) or $250,000 (married filing jointly), you pay an extra 0.9% Medicare tax on income above that threshold.
  • FICA is withheld the same way for all workers and does not change based on your tax bracket or number of dependents.
  • Self-employed people pay both the employee and employer portions (15.3% total), though they can deduct half of it on their tax return.

Why Social Security has a wage cap but Medicare does not

Social Security is designed as an insurance program where benefits are tied to what you paid in. The program has a maximum benefit amount, so once you earn above a certain level, paying more in does not increase your future benefit. That wage cap exists to keep the program's math in balance. In 2024, that cap is $168,600, meaning if you earn $200,000, you pay Social Security tax only on $168,600 of it.

Medicare is structured differently — it is meant to cover hospital and medical costs for people over 65, and those costs do not have a built-in cap. So Medicare tax applies to all your wages, no matter how much you earn. This is why high earners pay Social Security tax for only part of the year but Medicare tax for the entire year.

The wage cap changes every year based on average wage growth. The Social Security Administration announces the new cap in October for the following year, so it is worth checking if you are close to the threshold.

How FICA appears on your pay stub

Your pay stub shows FICA as two separate line items: Social Security (labeled "OASDI" or "Social Security") and Medicare. Each shows the percentage withheld and the dollar amount. If you earn over $200,000, you will also see a third line for the Additional Medicare Tax (the extra 0.9%).

The employer's portion does not appear on your pay stub — it is a cost the employer reports to the IRS separately. But it is real money that reduces what the employer has available to pay you in wages or benefits. Some employers show it on a separate document or annual summary so you can see the full FICA burden.

If you work for multiple employers in the same year, each one withholds Social Security tax independently. This can mean you pay more than the annual cap if your combined income exceeds the threshold. For example, if you earn $100,000 at one job and $100,000 at another, you pay Social Security tax on both, even though your total is $200,000. You can claim the overpayment on your tax return and get a refund.

FICA for self-employed workers

If you are self-employed, you pay both the employee and employer portions of FICA — 15.3% total on your net self-employment income. This is called self-employment tax, and it is calculated on Schedule SE of your tax return. The calculation is slightly different because you use net income (revenue minus business expenses) rather than gross wages.

Self-employed workers get one break: you can deduct half of your self-employment tax on your income tax return. This reduces your taxable income and lowers your federal income tax bill, though it does not reduce the FICA amount itself. If you earn $100,000 in self-employment income, you pay roughly $15,300 in self-employment tax, but you can deduct about $7,650 of it, which saves you money on income tax.

The Social Security wage cap still applies to self-employed income. Once your net self-employment income reaches $168,600 in 2024, you stop paying the 6.2% Social Security portion on additional income, but you continue paying 2.9% Medicare tax on everything.

What happens if you overpay FICA

If you work for multiple employers or change jobs during the year, you might pay more Social Security tax than the annual cap allows. The IRS does not automatically refund the overpayment — you have to claim it on your tax return. When you file, the IRS compares what you paid across all employers to the annual maximum and issues a refund for any excess.

This is one reason to file a tax return even if you do not owe income tax. If you overpaid Social Security tax, filing gets you that money back. The refund appears as a credit on your return and reduces any income tax you owe, or you receive it as a refund check.

Medicare tax overpayment is rarer but can happen if you earn over $200,000 and work for multiple employers. Each employer withholds the Additional Medicare Tax independently, so you might pay more than you owe. Again, you claim the overpayment on your return.

FICA versus income tax: why they are separate

FICA and federal income tax are two different systems that happen to be withheld from the same paycheck. FICA funds Social Security and Medicare — specific programs with specific rules. Income tax funds the general operations of the federal government. They use different rates, different caps, and different rules about who pays.

Income tax is progressive, meaning higher earners pay a higher percentage. FICA is flat — everyone pays the same percentage on wages up to the cap. This is why someone earning $50,000 and someone earning $500,000 both pay 6.2% Social Security tax on their wages (up to the cap), even though they pay very different income tax rates.

Your W-4 form controls how much income tax is withheld, but it does not affect FICA. FICA is automatic and the same for everyone. This separation matters because you might owe income tax but have no FICA liability (if you are self-employed and earn below the threshold), or vice versa.

State and local FICA considerations

FICA is a federal tax, so it is the same in every state. However, some states also have their own payroll taxes for disability insurance, paid family leave, or unemployment insurance. These are separate from FICA and appear as additional line items on your pay stub. California, New Jersey, New York, and Rhode Island have state disability insurance programs, for example.

A few states do not have income tax but still withhold FICA. If you live in Florida, Texas, or another state with no income tax, you still pay federal FICA the same way — it just means your total payroll withholding is lower because there is no state income tax on top of it.

Frequently Asked Questions

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

FICA is mandatory for all workers, regardless of whether you expect to use the benefits. Social Security and Medicare are insurance programs, and the tax funds them for current retirees and disabled workers. Even if you do not collect, your payments support the system for others. If you do collect, your benefit is based on what you paid in.

Can I opt out of FICA?

No. FICA is mandatory for all employees and self-employed workers. The only exceptions are certain religious groups and some government employees hired before specific dates, and those exceptions are rare and require formal approval from the IRS.

Does FICA count toward my income tax refund or owed amount?

No. FICA and income tax are calculated separately. You might owe income tax but have overpaid FICA, or vice versa. When you file your return, each is handled independently. Any FICA overpayment is refunded, and any income tax owed is due.

What if I work part-time or have irregular income?

FICA is withheld on every paycheck, regardless of whether you work full-time or part-time. If your income is irregular, you still pay FICA on what you earn. The Social Security wage cap still applies — once you hit $168,600 in a year, no more Social Security tax is withheld, even if you earn more later.

Do I pay FICA on tips, bonuses, or commissions?

Yes. FICA applies to all compensation — wages, tips, bonuses, commissions, and most other forms of payment from an employer. The only common exceptions are certain fringe benefits like health insurance premiums paid by the employer. Your employer should withhold FICA on all taxable wages.