Payroll Tax Calculator — 2025 FICA Employee vs Employer
Break down 2025 FICA payroll tax by employee and employer side: Social Security 6.2% to the wage base, Medicare 1.45%, plus the 0.9% surtax. Free tool.
About Payroll Tax Calculator
A payroll tax calculator is a tool that breaks down the federal FICA payroll taxes on wages for the 2025 tax year into the employee share and the matching employer share. FICA has two components. Social Security is 6.2% from each side on wages up to the 2025 wage base of $176,100, so earnings above that are not subject to it. Medicare is 1.45% from each side on all wages with no cap, plus a 0.9% Additional Medicare Tax paid by the employee alone on earnings over a filing-status threshold. This calculator shows each side and the combined cost. It is a 2025 estimate, not tax advice.
Use cases
- See what you and your employer each pay. A paystub shows your FICA deduction but hides the matching amount your employer pays on your behalf. This tool lays out both sides — Social Security 6.2% each and Medicare 1.45% each — so you can see the full cost of employing you. That combined figure is useful when comparing a salaried role with contract work, where you would owe both sides yourself.
- Apply the Social Security wage base correctly mid-year. Social Security tax stops once your year-to-date wages reach $176,100 in 2025. Entering your YTD wages lets the calculator apply the cap accurately, so a high earner mid-year sees Social Security tax taper off on the portion above the base, while Medicare, which has no cap, keeps applying to every dollar earned.
- Estimate an employer’s payroll cost per employee. Small-business owners and freelancers hiring help need to budget the employer share of FICA on top of gross pay. Feeding in an employee’s wage shows the 6.2% Social Security and 1.45% Medicare the employer owes, giving a clearer true cost of a hire before adding unemployment tax, benefits, and other overhead the tool does not cover.
- Understand the self-employed equivalent. Self-employed people do not split FICA with an employer; they pay both halves as self-employment tax — 12.4% Social Security up to the wage base and 2.9% Medicare. Comparing the two-sided employee breakdown here with that single self-employed total makes the difference concrete when weighing a W-2 job against 1099 work.
- Sanity-check a paystub or W-2. FICA on a paystub should equal 6.2% and 1.45% of that period’s wages, and the 0.9% Additional Medicare should appear only after year-to-date wages pass $200,000. Entering the same figures here lets you confirm the numbers line up, so a payroll error — a missed wage-base cap, a wrong rate, or the surtax applied too early — is easy to spot before it compounds across the year.
How it works
- Enter the gross wages. Type the wage amount you want to analyse for 2025; the rates apply to this figure.
- Add year-to-date wages. Provide wages already earned this year so the tool knows how much of the $176,100 Social Security base remains.
- Select the filing status. This sets the threshold for the employee-only 0.9% Additional Medicare Tax on high earnings.
- Review the employee side. See the employee’s 6.2% Social Security (subject to the cap), 1.45% Medicare, and any 0.9% surtax.
- Review the employer side and totals. See the employer’s matching 6.2% and 1.45% (no 0.9% match), plus the combined payroll-tax total.
Examples
Input: $5,000 wage, $0 YTD, single
Output: Employee $382.50, Employer $382.50
6.2% + 1.45% = 7.65% each side; well under both the wage base and the surtax threshold.
Input: $10,000 wage, $175,000 YTD, single
Output: Social Security taxed on only $1,100
YTD $175,000 leaves $1,100 of the $176,100 base; the rest of the wage is Medicare-only.
Input: $20,000 wage, $250,000 YTD, single
Output: No Social Security; 0.9% surtax applies
Past the wage base, so no Social Security; wages over $200,000 trigger the employee-only 0.9% Medicare surtax.
Frequently asked questions
What taxes count as payroll (FICA) tax?
FICA is the combination of Social Security tax (6.2% each from employee and employer) and Medicare tax (1.45% each), plus the employee-only 0.9% Additional Medicare Tax on high earnings. It does not include federal or state income tax withholding.
What is the 2025 Social Security wage base?
It is $176,100. Social Security tax of 6.2% applies only to wages up to that amount each year; earnings above it are not subject to Social Security tax, though Medicare tax continues with no cap.
Does the employer pay the 0.9% Additional Medicare Tax too?
No. The 0.9% surtax is paid by the employee only and is never matched by the employer. The employer matches the 6.2% Social Security and 1.45% Medicare, but not the additional 0.9%.
Why do you ask for year-to-date wages?
Because the Social Security cap and the 0.9% surtax threshold are annual. Knowing wages already earned this year lets the tool apply the $176,100 cap and the $200,000 withholding point correctly for a mid-year paycheck.
Does this include income tax or take-home pay?
No. It calculates FICA payroll tax only, not federal or state income tax. For net pay after all taxes and deductions, use a dedicated paycheck calculator.
How is it different for the self-employed?
The self-employed pay both the employee and employer halves themselves through self-employment tax — 12.4% Social Security up to the wage base and 2.9% Medicare — rather than splitting it with an employer.
Is my wage information stored?
No. All calculations run in your browser, and nothing you enter is uploaded or saved.
Pro tips
- Use Medicare or Social Security wages from your paystub, which can differ from taxable income because pre-tax retirement contributions still count for FICA.
- Keep year-to-date wages current so the Social Security cap applies at the right point in the year.
- Remember the employer’s 6.2% + 1.45% is a real cost of hiring, useful when pricing contract work.
- For total take-home, pair this with the Paycheck Calculator, which adds income tax withholding.
- Treat the numbers as a 2025 estimate and confirm specifics with a payroll professional or the IRS.
Reviewed by Ahsan Mahmood · Last updated 2026-07-08 · Part of ZTools.
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