How FICA taxes are calculated from your paycheck

FICA taxes come out of your paycheck in two parts: Social Security (6.2% of your gross wages) and Medicare (1.45% of your gross wages). Your employer withholds these amounts and sends them to the IRS on your behalf. If you are self-employed, you pay both the employee and employer portions — 12.4% for Social Security and 2.9% for Medicare — which is called self-employment tax.

The calculation is straightforward for most employees: take your gross pay (before deductions), multiply by the rate, and that is what comes out. For Social Security, there is a wage cap — in 2024, you stop paying the 6.2% rate once you earn $168,600 in a calendar year. Medicare has no cap, but there is an additional 0.9% Medicare tax on wages over $200,000 (single) or $250,000 (married filing jointly).

Your W-4 form does not directly control FICA withholding the way it controls income tax withholding. FICA comes out automatically at the fixed rates. The W-4 only affects federal income tax, which is separate.

Key Takeaways

  • Social Security tax is 6.2% of wages up to $168,600 per year; Medicare tax is 1.45% of all wages with no cap.
  • Self-employed people pay both the employee and employer share (12.4% Social Security, 2.9% Medicare) on net earnings from self-employment.
  • An additional 0.9% Medicare tax applies to wages over $200,000 (single) or $250,000 (married filing jointly).
  • Your W-4 form controls income tax withholding only, not FICA; FICA withholding is automatic and fixed by law.
  • You can estimate your annual FICA by multiplying your expected gross income by the applicable rates, then subtracting once you hit the Social Security wage cap.

Step-by-step calculation for W-2 employees

Start with your gross pay for the pay period — this is your salary or hourly wage before any deductions. Multiply that amount by 0.062 for Social Security and by 0.0145 for Medicare. Add those two numbers together to get your total FICA withholding for that pay period.

If you are paid biweekly and earn $60,000 per year, your gross per paycheck is roughly $2,308. Social Security withholding: $2,308 × 0.062 = $143. Medicare withholding: $2,308 × 0.0145 = $33.47. Total FICA per paycheck: $176.47. Over 26 paychecks, that is $4,588 annually — assuming you stay under the Social Security wage cap.

Once your cumulative wages for the year reach $168,600, your employer stops withholding the 6.2% Social Security tax. If you earn $180,000 annually, you will hit that cap partway through the year and pay Social Security tax on only $168,600 of your income. Medicare tax continues on all $180,000.

Self-employment tax calculation

Self-employed people calculate FICA differently because they owe both halves. You start with your net self-employment income — your business income minus business expenses, reported on Schedule C. You do not pay self-employment tax on your entire net profit; you multiply it by 92.35% first, then explore the tax rates.

If your net self-employment income is $50,000, multiply by 0.9235 to get $46,175. Then explore 12.4% for Social Security ($5,726) and 2.9% for Medicare ($1,339). Total self-employment tax: $7,065. You report this on Schedule SE (Form 1040), and it flows to your Form 1040 as part of your total tax liability.

You can deduct half of your self-employment tax as an adjustment to income on your Form 1040, which lowers your taxable income. This partially offsets the burden of paying both the employee and employer portions.

The Social Security wage cap and how it affects high earners

The Social Security wage cap changes each year based on wage growth. In 2024, it is $168,600. This means if you earn $200,000, you pay 6.2% Social Security tax only on the first $168,600 — that is $10,453 — and then nothing on the remaining $31,400. Medicare tax, by contrast, applies to all $200,000.

High earners also face the additional 0.9% Medicare tax. If you are single and earn $220,000, you pay an extra 0.9% on the $20,000 above $200,000 — that is $180 more in Medicare tax. If you are married filing jointly, the threshold is $250,000 combined.

This additional Medicare tax is withheld by your employer if you are a W-2 employee. If you are self-employed or have multiple jobs, you may need to track it yourself and pay it when you file your return, because no single employer may see your full income.

What happens if you have multiple jobs or side income

If you work two W-2 jobs, each employer withholds Social Security and Medicare based only on what they pay you. Neither employer knows about the other job. This can create a problem: you might overpay Social Security tax if your combined wages exceed $168,600.

For example, if you earn $100,000 at Job A and $100,000 at Job B, Job A withholds $6,200 in Social Security tax and Job B withholds another $6,200, for a total of $12,400. But you should only pay $168,600 × 0.062 = $10,453. You overpaid by $1,947. You can claim a credit for the overpayment when you file your tax return on Form 1040.

If you have W-2 income and self-employment income, the calculation is more complex. You pay self-employment tax on your net self-employment income, and your W-2 employer withholds FICA on your wages. You need to track both to see if you have exceeded the Social Security cap across all sources.

Using your pay stub to verify FICA withholding

Your pay stub shows exactly how much FICA was withheld. Look for line items labeled "Social Security Tax" or "OASDI" (Old Age, Survivors, and Disability Insurance) and "Medicare Tax." These should match the rates and amounts you calculated. If they do not, contact your payroll department — errors do happen.

Over the course of a year, add up all the FICA withholdings from your pay stubs. This total should appear on your W-2 form in boxes 4 (Social Security tax withheld) and 6 (Medicare tax withheld). When you file your return, the IRS matches these amounts to what you report, so accuracy matters.

If you notice you have overpaid Social Security tax because you hit the wage cap or had multiple jobs, your W-2 will show the correct amount withheld. You then claim the overpayment as a credit on Form 1040, line 33, and the IRS refunds it.

Planning ahead: estimating your annual FICA

To estimate your annual FICA, multiply your expected gross income by the applicable rates. If you expect to earn $75,000 as a W-2 employee, estimate $75,000 × 0.062 = $4,650 for Social Security and $75,000 × 0.0145 = $1,088 for Medicare, totaling $5,738 in FICA.

If you expect to earn more than $168,600, subtract the excess from the Social Security calculation. For $200,000 in wages: Social Security is $168,600 × 0.062 = $10,453. Medicare is $200,000 × 0.0145 = $2,900. If you are single and earn over $200,000, add another 0.9% on the excess: ($200,000 − $200,000) × 0.009 = $0 in this case, but if you earned $220,000, it would be $20,000 × 0.009 = $180.

For self-employed income, multiply your expected net profit by 0.9235, then by 0.124 for Social Security and 0.029 for Medicare. This gives you a rough idea of what you will owe. Many self-employed people set aside 15% to 20% of net income to cover both FICA and income tax, then adjust based on their actual return.

Frequently Asked Questions

Can I reduce my FICA taxes by changing my W-4?

No. Your W-4 controls only federal income tax withholding, not FICA. Social Security and Medicare taxes are fixed by law at 6.2% and 1.45% respectively. The only way to reduce FICA is to earn less or to use tax-deferred retirement accounts like a 401(k) or traditional IRA, which lower your taxable income but not your FICA base.

What if I overpaid Social Security tax because of multiple jobs?

You will receive a refund when you file your tax return. The IRS automatically calculates the overpayment based on your W-2 forms and applies it as a credit. You do not need to do anything special — just file your return as normal, and the credit will appear on line 33 of Form 1040.

Do I pay FICA on tips?

Yes. Tips are considered wages for FICA purposes. Your employer should include tips you report in your gross wages for FICA withholding. If you receive cash tips that you do not report, you still owe FICA on them when you report them to your employer or on your tax return.

How do I know if I owe the extra 0.9% Medicare tax?

If you are single and your wages exceed $200,000, or married filing jointly and your combined wages exceed $250,000, you owe the additional 0.9% Medicare tax on the excess. Your W-2 employer should withhold this if they know your income exceeds the threshold. If you have multiple jobs or self-employment income, check your total wages across all sources and calculate the tax yourself.

Is self-employment tax the same as FICA?

Self-employment tax is the self-employed person's version of FICA. It covers the same Social Security and Medicare programs but is calculated differently because you pay both the employee and employer portions. You report it on Schedule SE and it becomes part of your total tax liability on Form 1040.