Yes — Social Security and Medicare deductions do count as federal taxes. They are levied by the federal government under the Federal Insurance Contributions Act, known as FICA, and every employer in the country is required to withhold them. But they are legally and mechanically separate from the federal income tax that also comes out of your paycheck. Same paycheck, same federal government, two different taxes with different rules.
That distinction is the reason your pay stub lists them on separate lines, and it’s the reason the amount withheld for Social Security and Medicare never changes when you update your W-4.
What FICA Is and What You Pay
FICA has two components. The Social Security portion funds retirement, disability, and survivor benefits. The Medicare portion funds hospital insurance for people 65 and older, along with certain younger people with disabilities or end-stage renal disease.1Social Security Administration. Medicare Information
You pay 6.2% of your wages for Social Security and 1.45% for Medicare, a combined 7.65%. Your employer pays a matching 7.65% on top of that, which doesn’t appear on your stub.2Internal Revenue Service. Topic no. 751, Social Security and Medicare withholding rates
Social Security tax stops once your annual wages hit the wage base cap. For 2026, that cap is $184,500.3Social Security Administration. Contribution and Benefit Base Medicare has no cap; every dollar you earn is subject to the 1.45%. High earners pay an extra 0.9% Medicare surtax on wages above $200,000 for single filers or $250,000 for married couples filing jointly, and the employer does not match this piece.4Internal Revenue Service. Questions and answers for the Additional Medicare Tax
How FICA Is Different From Federal Income Tax
Both are federal, both come out of the same paycheck, and both go to the IRS. That is where the overlap ends.
Where the Money Goes
FICA revenue flows into two dedicated trust funds, one for Social Security and one for Medicare. By law, Congress cannot redirect those funds to pay for defense, highways, or any other general spending. Federal income tax goes into the Treasury’s General Fund and pays for everything else the federal government does.
How the Tax Is Calculated
FICA is a flat percentage. You pay 6.2% and 1.45% from the first dollar you earn, with no personal exemptions or deductions to shrink the base. Federal income tax uses a progressive bracket system: each slice of your taxable income is taxed at a higher marginal rate as you climb. For 2026, those brackets range from 10% on the first $12,400 of taxable income for a single filer up to 37% on income above $640,600.5Internal Revenue Service. IRS releases tax inflation adjustments for tax year 2026, including amendments from the One, Big, Beautiful Bill Taxable income is your gross wages after deductions, so two people earning the same salary can owe very different amounts of income tax and identical amounts of FICA.
What You Can Control
Federal income tax withholding is adjustable. Form W-4 lets you account for filing status, dependents, a second job, or expected deductions, and your employer recalculates your withholding accordingly.6Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate FICA withholding has no equivalent form. Your employer applies the flat percentages every pay period regardless of your family size, deductions, or filing status. There is no lever to pull.
What Happens on Your Return
Federal income tax withheld throughout the year is a prepayment against your actual tax liability, reconciled on your 1040. If you had too much withheld, you get a refund; too little, you owe.
FICA works differently. It isn’t reconciled on your return the way income tax is, and as an employee you cannot deduct your share of FICA on your personal return. The 7.65% is gone. The one exception is a true overpayment — most commonly, when you worked two or more jobs and your combined Social Security wages exceeded $184,500. In that case each employer withheld independently, and the excess is credited or refunded when you file. If an employer withheld FICA in error, ask the employer to correct it first; if that fails, you can file Form 843 to claim the refund from the IRS directly.7Internal Revenue Service. Instructions for Form 843
What About the “Additional” Medicare-Sounding Taxes?
Two other items get confused with FICA and shouldn’t be.
The 0.9% Additional Medicare Tax mentioned above is genuinely part of Medicare and is withheld from paychecks once you cross $200,000 with a single employer. Your employer doesn’t know your spouse’s income or your filing status, so the actual amount you owe is settled on your annual return.4Internal Revenue Service. Questions and answers for the Additional Medicare Tax
The 3.8% Net Investment Income Tax often gets grouped with Medicare because of its name, but it is not a FICA tax and is not withheld from your paycheck. It applies to investment income — dividends, capital gains, rental income — when your modified adjusted gross income exceeds $200,000 for single filers or $250,000 for married couples filing jointly, and it is calculated on your annual return.8Internal Revenue Service. Net Investment Income Tax
If You’re Self-Employed
Self-employed workers pay the same taxes under a different name. Sole proprietors, independent contractors, and partners in unincorporated businesses pay under the Self-Employment Contributions Act (SECA), which covers both the employee and employer halves: 12.4% for Social Security and 2.9% for Medicare, a combined 15.3%, plus the 0.9% Additional Medicare Tax at the same thresholds.9Internal Revenue Service. Self-employment tax (Social Security and Medicare taxes)
Two adjustments soften that number. Only 92.35% of your net earnings are subject to the tax, and half of the self-employment tax you pay is deductible against your income tax on Schedule 1 of Form 1040.10Internal Revenue Service. Topic no. 554, Self-employment tax You only owe self-employment tax at all once your net earnings reach $400 for the year.11Internal Revenue Service. Instructions for Schedule SE (Form 1040) (2025)
The Short Version
When someone asks whether Social Security and Medicare “count” as federal tax, they usually mean one of two things. If the question is whether the deductions are federal taxes at all — yes, they are federal taxes collected by the IRS. If the question is whether they are the same as federal income tax — no. FICA is a flat, dedicated payroll tax with a cap on the Social Security side and no adjustments through the W-4. Federal income tax is a progressive tax on your taxable income, reconciled every year on your return. Both belong to the federal government; only one of them will change when your circumstances change.