Payroll taxes are the money your employer takes from your paycheck and sends to the federal government

When you see your paycheck, the gross amount (what you earned) is larger than the net amount (what you take home). The difference includes payroll taxes. Your employer withholds these taxes from your pay, then sends them to the Internal Revenue Service (IRS) and the Social Security Administration (SSA). You do not write a check yourself — the withholding happens automatically.

Payroll taxes fund three specific programs: Social Security, Medicare, and federal income tax. Each one comes out of your paycheck at a different rate. Your employer also pays a matching amount on your behalf, though you do not see that money on your stub.

Key Takeaways

  • Payroll taxes are withheld from your paycheck in three parts: Social Security (6.2%), Medicare (1.45%), and federal income tax (varies by your W-4 form).
  • Your employer matches the Social Security and Medicare portions, meaning the government receives double what comes out of your check.
  • Social Security and Medicare taxes have wage caps — you stop paying Social Security tax after earning a certain amount each year, but Medicare tax continues on all income.
  • The amount withheld for federal income tax depends on what you claimed on your W-4 form when you started the job.
  • You can see exactly what was withheld by looking at your pay stub or your W-2 form at the end of the year.

The three parts of payroll tax and what each one funds

Social Security tax is 6.2% of your gross pay. This money goes into a trust fund that pays retirement benefits, disability benefits, and survivor benefits. When you turn 62 or older, you can begin drawing from this fund based on how much you paid in and how long you worked. If you become disabled before retirement age, you may receive disability payments. If you die, your family members may receive survivor benefits.

Medicare tax is 1.45% of your gross pay. This funds the Medicare program, which provides health insurance to people 65 and older and to some younger people with disabilities or end-stage renal disease. Unlike Social Security, there is no wage cap on Medicare tax — you pay it on every dollar you earn, no matter how much you make in a year.

Federal income tax withholding is the third piece. This amount varies from person to person based on what you reported on your W-4 form when you started your job. The W-4 asks about your filing status, number of dependents, and other income. The more you claim, the less is withheld. The less you claim, the more is withheld. This money goes to the IRS and is credited toward your annual federal income tax bill.

Wage caps and why they matter

Social Security tax has an annual wage cap, which means you stop paying it once you reach a certain income level in a calendar year. For 2024, that cap is $168,600 — if you earn more than that, you do not pay Social Security tax on the amount above it. Medicare tax has no cap, so you pay 1.45% on all your income regardless of how much you earn.

This matters most if you change jobs mid-year or have multiple jobs. If you worked at one job and paid Social Security tax on $100,000, then switched to a second job and earned another $80,000, you would pay Social Security tax on the full $80,000 at the second job because you have not hit the cap yet that year. When you file your tax return, you can claim a credit for any overpayment.

How your employer's matching contribution works

For every dollar of Social Security and Medicare tax that comes out of your paycheck, your employer pays an equal amount. So if you pay 6.2% in Social Security tax, your employer also pays 6.2% — but you do not see this on your pay stub because it does not come from your wages. The employer sends both amounts to the government.

This employer match is one reason why self-employed people pay more in payroll taxes than employees. A self-employed person must pay both the employee and employer portions, which totals 15.3% for Social Security and Medicare combined (12.4% + 2.9%). Employees only see their half withheld.

Reading your pay stub to see what was withheld

Your pay stub shows the gross amount you earned, then lists each deduction. Look for lines labeled "Social Security," "Medicare," "Fed Tax," or similar. The amounts should match the percentages described above, unless you have reached the Social Security wage cap for the year.

If the federal income tax withholding seems wrong — too high or too low — you can update your W-4 form with your employer. You do not need to wait until the end of the year. Changing your W-4 takes effect on your next paycheck.

The difference between payroll taxes and income tax

Payroll taxes and federal income tax are not the same thing, though they both come out of your paycheck. Payroll taxes (Social Security and Medicare) are fixed percentages that fund specific programs. Federal income tax withholding is an estimate based on your W-4 and is meant to cover your annual income tax bill.

At the end of the year, your employer sends you a W-2 form showing all the payroll taxes and federal income tax withheld. You use this form to file your tax return. If too much was withheld, you get a refund. If too little was withheld, you owe money.

What happens to payroll taxes after they are collected

Your employer sends payroll taxes to the IRS and SSA on a regular schedule — usually monthly or quarterly, depending on the size of the business. The Social Security Administration deposits Social Security tax into the Social Security Trust Fund. The Centers for Medicare and Medicaid Services (CMS) uses Medicare tax to pay for Medicare claims. The IRS credits federal income tax withholding toward your annual tax bill.

These taxes are not held in an individual account with your name on it. Social Security and Medicare operate as pay-as-you-go systems, meaning current workers' taxes pay for current beneficiaries' benefits. When you retire or become may be able to access, future workers' taxes will help pay your benefits.

Frequently Asked Questions

Why does my paycheck show Social Security tax but I have not retired yet?

Social Security tax is withheld from every paycheck throughout your working life. The money goes into the Social Security Trust Fund, which pays current retirees, disabled workers, and survivors. When you retire, your benefits will come from taxes paid by workers at that time. You are building a record of earnings that determines how much you will receive later.

Can I opt out of paying payroll taxes?

No. Payroll taxes are mandatory for all employees and employers in the United States. The only exceptions are certain religious groups and some government employees with their own pension systems, and these require specific approval from the IRS.

What if I think too much federal income tax is being withheld?

You can adjust your W-4 form with your employer to reduce the withholding. Fill out a new W-4, indicate fewer dependents or claim adjustments, and give it to your payroll department. The change takes effect on your next paycheck. You can also adjust it if you think too little is being withheld.

Do I get back the payroll taxes I paid if I did not work the full year?

Social Security and Medicare taxes are not refundable — once withheld, they go into the trust funds. However, if you overpaid federal income tax, you will receive a refund when you file your tax return. Self-employed people can deduct the employer portion of self-employment tax when calculating their income tax.

What is the difference between my W-2 and my pay stub?

Your pay stub shows what was withheld from each individual paycheck. Your W-2 form, sent at the end of the year, shows the total of all your paychecks and all taxes withheld for the entire year. You use the W-2 to file your tax return.