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Payroll Tax Calculator

Calculate FICA payroll taxes (Social Security and Medicare) withheld from an employee's paycheck.

Result

Total FICA Tax
$6,120.00
Social Security (6.2%)
$4,960.00
Medicare (1.45%)
$1,160.00
Additional Medicare (0.9%)
$0.00

Your employer pays a matching amount separately (except the Additional Medicare surtax).

Social Security: $5KMedicare: $1KAdditional Medicare: $0Total$6K
  • Social Security - $5K
  • Medicare - $1K
  • Additional Medicare - $0

About the Payroll Tax Calculator

Every paycheck, a chunk disappears before it ever reaches your bank account - that's payroll tax, officially known as FICA (Federal Insurance Contributions Act). It funds Social Security and Medicare, and it's separate from the federal and state income tax withheld from the same paycheck. Our Payroll Tax Calculator breaks down exactly how much of your wages go to each program.

How It Works

FICA has two parts. Social Security tax is 6.2% of wages up to an annual wage base ($176,100 for 2025) - earn more than that and the Social Security portion stops for the rest of the year. Medicare tax is 1.45% of all wages with no cap, plus an Additional Medicare surtax of 0.9% on wages above $200,000 (single) or $250,000 (married). The calculator applies all three pieces to your entered annual wages.

Social Security = min(wages, $176,100) × 6.2% Medicare = wages × 1.45% Additional Medicare = max(wages − threshold, 0) × 0.9%

Formula & Methodology

FICA is intentionally split into two differently-behaved taxes. Social Security tax exists to fund a benefit with a maximum payout, so it's capped at the wage base - once your year-to-date wages cross that line, Social Security withholding simply stops for the rest of the year. Medicare has no such cap because it funds a healthcare program without an equivalent per-person benefit ceiling, so it applies to every dollar of wages, plus an extra 0.9% surtax on income above the high-earner threshold that was added by the Affordable Care Act specifically to help fund Medicare expansion.

Step-by-Step: Calculating It By Hand

  1. 1Take your gross wages for the year (or the period you're calculating).
  2. 2Apply 6.2% Social Security tax to wages up to the annual wage base cap, and stop applying it above that cap.
  3. 3Apply 1.45% Medicare tax to all wages with no cap.
  4. 4If wages exceed the Additional Medicare threshold for your filing status, apply an extra 0.9% to only the amount above that threshold.
  5. 5Sum the three components for total FICA (employee side).

Examples

Typical salary

$80,000 in wages → $4,960 Social Security + $1,160 Medicare = $6,120 total FICA, with no Additional Medicare surtax.

High earner

$250,000 in wages (single) → Social Security caps at $10,918, Medicare is $3,625, plus $450 Additional Medicare surtax on the $50,000 over the threshold.

Advantages

  • Shows the Social Security wage base cap most people don't know exists
  • Separately breaks out the Additional Medicare surtax for high earners
  • Helps reconcile the FICA line items on your actual pay stub
  • Useful for both employees and employers estimating payroll costs

Common Mistakes

  • Not realizing Social Security tax stops once you hit the annual wage base
  • Forgetting employers pay a matching 6.2%/1.45% share on top (except the surtax)
  • Confusing FICA with federal income tax - they're calculated completely separately
  • Missing that self-employed people pay both halves themselves via SE tax

Edge Cases to Watch For

  • If you switch employers mid-year, each employer withholds Social Security tax independently up to the cap - you may end up over-withheld and can claim the excess back as a credit when filing.
  • The Additional Medicare surtax threshold is based on total household income for married filers, not per-employer, so employers can't always withhold it correctly on their own.
  • Self-employed workers pay both the employee and employer share of FICA (as self-employment tax) since there's no separate employer to split it with.
  • The Social Security wage base is adjusted for inflation most years, so the cap used in a manual calculation should always be checked against the current year's published figure.

Common Use Cases

  • Verifying FICA withholding on a pay stub is correct
  • Estimating total payroll cost as an employer
  • Understanding why a raise stops increasing your Social Security withholding at high income
  • Comparing W-2 payroll tax against self-employment tax
Written & fact-checked by the Calculateus TeamLast updated August 5, 2026How we verify our formulas

Frequently asked questions

Why is there an Additional Medicare tax?

High earners pay an extra 0.9% Medicare tax on wages above $200,000 (single) or $250,000 (married filing jointly) - this portion is not matched by your employer.

Does Social Security tax apply to all my wages?

No - Social Security tax only applies up to an annual wage base cap that adjusts yearly. Wages above the cap are still subject to Medicare tax, just not Social Security.

Related calculators

Income Tax EstimatorEstimate your US federal income tax using 2025 marginal tax brackets.Self-Employment Tax CalculatorEstimate self-employment tax (Social Security + Medicare) on your net earnings.Sales Tax CalculatorCalculate sales tax and total price for a purchase.VAT CalculatorAdd or remove VAT from a price.

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Conclusion

FICA is a flat, largely unavoidable tax that funds Social Security and Medicare, and understanding the wage base cap and Additional Medicare surtax explains a lot about why paychecks look the way they do at different income levels. If you're self-employed instead of a W-2 employee, our 1099 Tax Calculator applies the equivalent self-employment tax to your situation.

References