The Basic FICA Calculation

FICA taxes are calculated by multiplying your gross pay by a fixed percentage for Social Security and Medicare. Your employer takes these amounts directly from each paycheck before you receive it. The calculation is straightforward: Social Security is 6.2 percent of your wages, and Medicare is 1.45 percent of your wages. If you earn $1,000 in a paycheck, Social Security takes $62 and Medicare takes $14.50.

Your employer also pays an equal amount on your behalf — another 6.2 percent for Social Security and 1.45 percent for Medicare. This employer portion does not come out of your paycheck, but it counts toward your Social Security record. The total FICA burden is therefore 15.3 percent when you combine what you pay and what your employer pays, though you only see your half on your pay stub.

Key Takeaways

  • Social Security tax is 6.2 percent of your gross wages, up to a wage limit that changes each year.
  • Medicare tax is 1.45 percent of all your gross wages with no upper limit.
  • An additional 0.9 percent Medicare tax applies to wages above $200,000 for single filers and $250,000 for married couples filing jointly.
  • Your employer pays an equal amount of FICA tax on your behalf, though this does not appear on your paycheck.
  • FICA is calculated on gross pay before any deductions for health insurance, retirement contributions, or taxes.

The Social Security Wage Limit

Social Security tax only applies to earnings up to a certain amount each year. This limit is called the wage base, and it increases annually to account for inflation. In 2024, the wage base is $168,600, meaning you pay 6.2 percent Social Security tax on the first $168,600 you earn in that year, but nothing on earnings above that amount.

Once you reach the wage base limit, your employer stops withholding Social Security tax from your remaining paychecks for that year. If you change jobs mid-year, each employer calculates Social Security tax independently based on what you earn at their company. You may end up paying more Social Security tax than necessary if you worked for multiple employers, but you can claim the overpayment as a credit on your tax return.

Medicare tax has no wage limit. You pay 1.45 percent on every dollar you earn, no matter how much you make in a year.

The Additional Medicare Tax

If your income exceeds certain thresholds, you pay an additional 0.9 percent Medicare tax on the amount over the limit. For single filers, this threshold is $200,000. For married couples filing jointly, it is $250,000. For married people filing separately, it is $125,000.

This additional tax applies to wages, tips, and self-employment income. Unlike regular Medicare tax, your employer does not pay a matching portion of the additional Medicare tax — you pay the full 0.9 percent yourself. Your employer is responsible for withholding it from your paycheck once your wages cross the threshold in that calendar year.

How FICA Appears on Your Pay Stub

Your pay stub shows FICA taxes broken into two line items: one for Social Security and one for Medicare. You will see them labeled as "FICA-SS" or "Social Security Tax" and "FICA-Med" or "Medicare Tax." The amount withheld depends on your gross pay for that period, not on your filing status or other deductions.

If you earn above the Medicare threshold, you may also see a third line for "Additional Medicare Tax" or "Medicare Surtax." This line only appears once your year-to-date wages cross the threshold for your filing status. Some employers calculate this automatically; others require you to provide a form to may support the correct amount is withheld.

FICA for Self-Employed Workers

If you are self-employed, you pay both the employee and employer portions of FICA, for a total of 15.3 percent. This is called self-employment tax. You calculate it on your net business income — your revenue minus business expenses — using Schedule SE when you file your tax return.

Self-employed workers do not have an employer withholding taxes from a paycheck, so you may need to make quarterly estimated tax payments to cover your FICA and income tax liability. You can deduct half of your self-employment tax as an adjustment to income on your tax return, which reduces your overall tax burden slightly.

What Happens to FICA Money

Social Security tax funds the Social Security program, which provides retirement, disability, and survivor benefits. The amount you pay in Social Security tax over your working years determines how much you receive in benefits later. Medicare tax funds the Medicare program, which provides health insurance for people age 65 and older and some younger people with disabilities.

FICA taxes are not held in an individual account with your name on it. Instead, the money goes into a general trust fund that pays current beneficiaries. Your future benefits are based on your earnings record and the tax you paid, not on a specific amount set aside for you.

Frequently Asked Questions

Why do I pay FICA if I will not receive Social Security for decades?

FICA taxes fund current retirees and disabled workers today. Your contributions build your own earnings record, which determines your future benefits. Even if you never collect, your payments support the system for current beneficiaries and establish your may be able to access if your circumstances change.

Can I opt out of paying FICA taxes?

No. FICA is mandatory for nearly all workers in the United States. A small number of religious groups and some government employees hired before specific dates may have exemptions, but these are rare and require formal documentation. Most workers cannot avoid FICA withholding.

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

Contact your employer when ready. They are legally required to withhold and pay FICA taxes. If they did not, you may still owe the tax when you file your return, and your employer may face penalties. Your state labor department can investigate if your employer refuses to correct the error.

Does FICA explore to tips and bonuses?

Yes. FICA is calculated on all wages, including tips you report to your employer and bonuses. Tips you do not report are not subject to FICA withholding, but you should report all tips to your employer so your earnings record is accurate for Social Security purposes.

How do I know if I have paid enough FICA to receive Social Security?

You need 40 credits to receive Social Security retirement benefits. You earn up to four credits per year based on your earnings, so it typically takes 10 years of work. You can view your earnings record and estimated benefits on your Social Security account at ssa.gov.