Simple definition
A payroll tax equal to 6.2% of your wages that funds Social Security retirement, disability, and survivor benefits. Your employer pays a matching 6.2%, and self-employed people pay both halves. It applies only to wages up to an annual cap the government adjusts. Picture a required deposit into a national safety net.
Why it matters
This tax funds the benefits you may rely on in retirement or if you become disabled, so the money is building toward future support. Because it stops at an annual wage cap, higher earners pay it on only part of their income.
Real-life example
Suppose you earn $50,000 in wages this year. Social Security tax takes 6.2%, or about $3,100, from your pay across the year. Your employer contributes another $3,100 on your behalf. Only wages up to the annual cap are taxed this way.
Formula
Social Security tax = 6.2% of wages (your employer matches another 6.2%)
Common mistakes
- Confusing the Social Security portion with the separate Medicare portion of FICA.
- Assuming all your income is taxed — wages above the annual cap are not.
- Forgetting that self-employed people owe both the employee and employer shares.
- Expecting this tax back as a refund the way income-tax withholding can be.
Pro tips
- Check your pay stub to see the Social Security line separate from Medicare.
- If self-employed, budget for both halves of the tax, not just one.
- Track your earnings record on the SSA site, since it sets your future benefit.
- Know that the taxable wage cap changes, so higher earners should plan ahead.
Related Money Dictionary terms
- FICAThe payroll tax that funds Social Security and Medicare, split between you and your employer on your wages.
- Payroll TaxTaxes taken out of wages to fund programs like Social Security and Medicare, paid by both worker and employer.
- Medicare TaxA payroll tax on all wages that helps fund hospital and medical coverage for people on Medicare.
- Self-Employment TaxThe Social Security and Medicare tax that self-employed people pay to cover both the employee and employer shares.
- WithholdingMoney your employer takes out of each paycheck and sends to the government toward your expected tax bill.
Frequently asked questions
How much is Social Security tax?
For employees it is 6.2% of your wages, and your employer pays a matching 6.2%. Self-employed people pay both halves themselves. The tax applies only to wages up to an annual cap that the government adjusts over time, so earnings above that cap are not taxed for Social Security.
Is there a limit on wages taxed?
Yes. Social Security tax applies only to wages up to an annual cap that the government adjusts periodically. Once your earnings pass that cap in a year, no more Social Security tax comes out of the additional wages. Medicare tax, by contrast, applies to all of your wages with no cap.
Do self-employed people pay it?
Yes, through self-employment tax. Because there is no employer to split the cost, they pay both the 6.2% employee share and the 6.2% employer share on their net earnings, up to the same annual wage cap. Part of the total is deductible, which softens the overall burden a bit.
Knowing what Social Security Tax means is knowledge — the first half. A brick gets placed when you act on it: check your pay stub to see how much Social Security tax comes out each period.
Also builds: Social Security & Government Benefits
Sources & references
More in Taxes
Plain-English education — not personalized legal, tax, or investment advice.