Payroll tax is money your employer takes from your paycheck and sends to the federal government

Payroll tax is not one tax — it is three separate taxes that your employer withholds from your wages before you receive your paycheck. The three are Social Security tax, Medicare tax, and federal income tax withholding. Your employer also pays a matching amount on your behalf, though you do not see that money. These taxes fund Social Security retirement and disability benefits, Medicare health insurance for people 65 and older, and the general operations of the federal government.

The money comes out of your gross pay — the full amount you earned before any deductions. If you earn $2,000 in a pay period, your employer calculates the withholding, subtracts it, and deposits the remainder into your account. The withheld amount goes to the U.S. Treasury, not to a separate account in your name.

Key Takeaways

  • Payroll tax consists of three separate withholdings: Social Security (6.2 percent of wages), Medicare (1.45 percent of wages), and federal income tax (varies by your W-4 form).
  • Your employer withholds these amounts from each paycheck and sends them to the federal government on your behalf.
  • Social Security tax stops once you reach the annual wage cap, which changes each year; Medicare tax does not have a cap.
  • The amount withheld for federal income tax depends on what you reported on your W-4 form when you started your job.
  • You can see the exact amounts withheld on your pay stub, which lists each tax separately.

How much payroll tax comes out of your paycheck

Social Security tax is 6.2 percent of your wages, up to an annual wage cap. In 2024, the cap is $168,600, meaning once you earn that much in a calendar year, no more Social Security tax is withheld from your remaining paychecks. Medicare tax is 1.45 percent of all your wages with no cap — it continues no matter how much you earn. Together, Social Security and Medicare are often called FICA taxes (Federal Insurance Contributions Act).

Federal income tax withholding is separate and varies 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. Your employer uses this information to calculate how much federal income tax to withhold. If you withhold too little, you may owe money when you file your tax return. If you withhold too much, you receive a refund.

Your pay stub shows all three withholdings separately. Look for lines labeled "Social Security," "Medicare," and "Federal Income Tax Withholding" or "FIT." The amounts should match the percentages and your gross pay for that period.

Why your employer withholds payroll tax

Federal law requires employers to withhold payroll tax and send it to the government. This is not optional — employers who fail to withhold or remit these taxes face penalties and criminal charges. The withholding system spreads tax collection throughout the year rather than requiring workers to pay a large lump sum when they file their annual return.

The Social Security and Medicare portions fund specific programs. When you pay 6.2 percent into Social Security, you are building a record of earnings that determines your retirement benefit amount later. The same applies to Medicare — your 1.45 percent contribution counts toward your may be able to access for Medicare at age 65. Federal income tax withholding funds general government operations.

The difference between payroll tax and income tax

Payroll tax and income tax are not the same thing, though the terms are sometimes confused. Payroll tax refers specifically to Social Security and Medicare taxes (FICA), which are withheld from every paycheck. Income tax usually refers to federal income tax withholding, which is also withheld from your paycheck but calculated differently and funds different purposes.

When you file your annual tax return, you report your total income and calculate your total tax liability for the year. The government then compares what you already paid through withholding to what you actually owe. If you withheld too much, you get a refund. If you withheld too little, you owe the difference. Social Security and Medicare taxes do not work this way — there is no true-up at tax time. What you pay throughout the year is final.

What happens to payroll tax money

Social Security tax goes into the Social Security Trust Fund, which pays retirement benefits to people 62 and older, disability benefits to workers who cannot work, and survivor benefits to their families. Medicare tax goes into the Medicare Trust Fund, which pays for hospital insurance (Part A) and helps fund other Medicare coverage. Federal income tax withholding goes to the general Treasury and funds federal agencies, defense, infrastructure, and other government programs.

You do not have a personal account where your payroll taxes accumulate. Social Security and Medicare operate on a pay-as-you-go system — current workers' taxes pay current beneficiaries' benefits. When you retire or become disabled, your benefits come from the taxes of workers at that time, not from money you personally set aside.

How to adjust your payroll tax withholding

If you find that you are receiving a large refund or owing money each year, you can adjust your withholding by submitting a new W-4 form to your employer. You do not need your employer's permission — you can change your W-4 at any time. The new withholding takes effect on your next paycheck.

Use the IRS W-4 worksheet or the IRS withholding calculator (available at irs.gov) to determine the right amount. If you have multiple jobs, a spouse who works, or significant non-wage income, the calculator helps account for that. Adjusting your withholding does not change your total tax liability — it only changes how much is taken out each paycheck versus how much you settle up when you file your return.

Self-employed workers and payroll tax

If you are self-employed, you pay both the employee and employer portions of Social Security and Medicare tax, combined into what is called self-employment tax. This is 15.3 percent of your net business income (12.4 percent for Social Security up to the annual cap, 2.9 percent for Medicare with no cap). You calculate and pay this tax when you file your annual tax return, usually in quarterly estimated tax payments.

Self-employed workers do not have an employer to withhold these taxes, so the responsibility falls on you to set aside money and pay on time. You can deduct half of your self-employment tax as a business expense on your tax return, which reduces your overall tax burden slightly.

Frequently Asked Questions

Why does my pay stub show different withholding amounts each month?

If your pay varies — for example, if you earn commissions or overtime — your withholding amounts will vary too, since they are calculated as percentages of your gross pay. Federal income tax withholding may also change if you submitted a new W-4 form. Social Security and Medicare percentages stay the same, but the dollar amounts change with your earnings.

What is the wage cap for Social Security tax?

The wage cap changes each year based on inflation. In 2024, it is $168,600. Once you earn that amount in a calendar year, your employer stops withholding Social Security tax from your remaining paychecks. Medicare tax has no cap and continues on all wages. The IRS announces the new cap each October for the following year.

Can I stop payroll tax withholding?

No. Payroll tax withholding is required by federal law. You cannot opt out or claim an exemption. You can adjust how much federal income tax is withheld by changing your W-4, but Social Security and Medicare withholding continue at the set percentages for all workers.

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

Social Security and Medicare taxes are not refundable — you do not get that money back. However, if you withheld too much federal income tax, you receive a refund when you file your tax return. If you earned below the threshold for owing federal income tax, you may get back all the federal income tax withheld, though Social Security and Medicare taxes are still gone.

What if my employer did not withhold payroll tax?

Contact your employer immediately and ask for a corrected pay stub. If your employer is not withholding required taxes, report it to the IRS using Form 13909 (available at irs.gov) or call the IRS at 1-800-829-1040. You are still responsible for paying these taxes even if your employer fails to withhold them.