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 pay by a set percentage. For 2024, you pay 6.2% for Social Security and 1.45% for Medicare, for a total of 7.65%. Your employer pays an equal amount on your behalf. If you are self-employed, you pay both the employee and employer portions, which comes to 15.3%.

The calculation happens on your gross pay — your full salary or wages before any deductions. FICA is taken out of every paycheck, whether you are paid weekly, biweekly, monthly, or on another schedule. The percentage stays the same throughout the year, but the dollar amount changes if your pay changes.

Social Security tax has a wage base limit, which means once you earn a certain amount in a year, you stop paying it. For 2024, that limit is $168,600. Medicare tax has no limit — you pay 1.45% on all your earnings, no matter how much you make. If you earn over $200,000 as a single filer (or $250,000 if married filing jointly), an additional 0.9% Medicare tax applies to the income above that threshold.

Key Takeaways

  • FICA is 7.65% of your gross pay: 6.2% for Social Security and 1.45% for Medicare.
  • Social Security tax stops once you reach $168,600 in earnings for the year (2024), but Medicare tax continues on all income.
  • Self-employed people pay 15.3% total because they cover both the employee and employer share.
  • FICA is calculated on your full pay before other deductions like income tax withholding or health insurance premiums.

How to calculate FICA on a single paycheck

Take your gross pay for that paycheck and multiply it by 0.0765. That is your total FICA tax for that period.

Example: If you earn $2,000 in a biweekly paycheck, your FICA is $2,000 × 0.0765 = $153. Your employer withholds $153 from your pay and sends it to the IRS along with an equal $153 contribution.

If you want to see the two parts separately, multiply your gross pay by 0.062 for Social Security and by 0.0145 for Medicare. In the example above, Social Security would be $2,000 × 0.062 = $124, and Medicare would be $2,000 × 0.0145 = $29. Together they equal $153.

How to calculate FICA for the full year

Add up all your paychecks for the year and multiply by 0.0765. This gives you the total FICA you will pay, assuming your pay stays the same and you do not hit the Social Security wage base limit.

If you earn $50,000 per year, your annual FICA is $50,000 × 0.0765 = $3,825. This comes out of your paychecks throughout the year, not all at once.

If you earn more than $168,600 in 2024, the calculation changes partway through the year. Once you cross that threshold, you stop paying the 6.2% Social Security tax on additional earnings. You continue paying 1.45% Medicare tax on everything. Your payroll department handles this automatically — they track your year-to-date earnings and stop withholding Social Security tax once you hit the limit.

What happens if you have multiple jobs

If you work more than one job, each employer calculates FICA on your pay from that job alone. This can mean you overpay Social Security tax if your combined earnings exceed $168,600.

Example: You earn $100,000 at Job A and $80,000 at Job B, for a total of $180,000. Job A withholds Social Security tax on all $100,000. Job B also withholds Social Security tax on all $80,000, even though your combined earnings are $180,000. You overpaid by $1,488 (6.2% × $24,000, the amount over the limit). You can claim this overpayment as a credit when you file your tax return.

Medicare tax has no wage base limit, so there is no overpayment issue there — you simply pay 1.45% on all earnings from all jobs.

How self-employed FICA works

If you are self-employed, you pay both the employee and employer portions of FICA, which totals 15.3%. You calculate this on your net self-employment income — your business income minus business expenses — not your gross revenue.

You pay self-employment tax when you file your tax return using Schedule SE (Form 1040). The calculation is: net self-employment income × 0.9235 × 0.153. The 0.9235 factor accounts for the fact that you can deduct half of your self-employment tax as a business expense.

Example: If your net self-employment income is $50,000, your self-employment tax is $50,000 × 0.9235 × 0.153 = $7,074. You pay this when you file your return, or in quarterly estimated tax payments throughout the year.

FICA withholding on different types of income

FICA applies to wages, salaries, and tips. It does not apply to investment income, interest, dividends, capital gains, or rental income. It also does not apply to certain types of compensation like health insurance premiums your employer pays on your behalf or contributions to a traditional 401(k).

Some income is exempt from FICA entirely. Student employees working at their school, certain religious workers, and some government employees do not pay FICA. If you fall into one of these categories, your employer will not withhold FICA from your pay.

Gig work and contract income are subject to self-employment tax (the self-employed version of FICA), even if you receive a 1099 form instead of a W-2. You still owe the tax and must pay it when you file your return.

Why FICA appears on your pay stub

Your pay stub shows FICA withholding as a line item because your employer is required to deduct it from your pay and send it to the IRS. You cannot opt out of FICA — it is mandatory for all covered workers. The amount withheld is based solely on your gross pay and the current tax rates; it does not change based on your tax filing status, dependents, or other deductions.

The FICA amount on your pay stub should match the calculation of your gross pay multiplied by 0.0765 (or 0.062 plus 0.0145 if shown separately). If it does not, ask your payroll department to explain the difference. Errors do happen, and catching them early makes them easier to fix.

Frequently Asked Questions

Why do I pay FICA if I also pay income tax?

FICA and income tax are two separate taxes that fund different programs. FICA funds Social Security and Medicare. Income tax funds general government operations. Both are withheld from your paycheck, and both are required.

Can I reduce my FICA taxes?

No. FICA is a flat percentage on gross pay with no deductions or credits. You cannot lower it by claiming dependents, adjusting your withholding, or using pre-tax deductions. The only way to reduce FICA is to earn less income.

What if my employer did not withhold FICA from my paycheck?

Contact your payroll department immediately. FICA withholding is required by law. If your employer is not withholding it, you may owe the full amount when you file your tax return, plus penalties. Your employer is also breaking the law and may face penalties themselves.

Do I get FICA taxes back when I file my return?

Not usually. FICA is not refundable. However, if you overpaid Social Security tax because you worked multiple jobs, you can claim the overpayment as a credit on your return. Medicare tax overpayment is handled differently — you claim it as a credit only if your employer failed to withhold correctly.

How much FICA will I pay in my lifetime?

This depends on your earnings over your working years. If you earn an average of $60,000 per year for 40 years, you will pay roughly $183,600 in FICA taxes (not accounting for wage increases or the Social Security wage base limit changes). Your employer pays an equal amount on your behalf.