A payroll tax is money your employer withholds from your paycheck and sends to the government

When you see your pay stub, the gross amount (what you earned) is larger than the net amount (what you take home). The difference includes federal income tax, Social Security tax, and Medicare tax — these are payroll taxes. Your employer is required by law to deduct them from your paycheck and send them directly to the IRS and Social Security Administration on your behalf. You do not write a check; the money never reaches your bank account.

Payroll taxes fund specific government programs. Social Security tax (6.2% of your wages, up to a cap that changes yearly) and Medicare tax (1.45% of all wages) go into trust funds that pay benefits to retirees, disabled workers, and people on Medicare. Federal income tax withholding goes into the general Treasury and funds federal operations. Your employer also pays a matching amount for Social Security and Medicare — that is a separate cost to them, not deducted from your pay.

The amount withheld depends on what you told your employer on Form W-4 when you were hired. That form asks about your filing status, number of dependents, and other income. The more you claim, the less your employer withholds. If too little is withheld, you owe money when you file taxes. If too much is withheld, you get a refund.

Key Takeaways

  • Payroll taxes are Social Security tax, Medicare tax, and federal income tax withheld from your paycheck by your employer.
  • Social Security and Medicare taxes are capped or fixed percentages; federal income tax withholding varies based on what you claim on Form W-4.
  • Your employer sends the withheld money to the IRS and Social Security Administration, not to you.
  • If you change your life situation — marriage, a second job, dependents — you should update your W-4 to adjust withholding.
  • Payroll taxes are separate from state and local taxes, which vary by where you live and work.

The three types of payroll tax and what they fund

Social Security tax is 6.2% of your wages, up to a yearly cap. In 2024, you stop paying Social Security tax once you earn $168,600 (the cap changes each year). This tax funds retirement benefits, survivor benefits for your family if you die, and disability benefits. When you turn 62 or older, you can claim Social Security retirement benefits based on how much you paid in.

Medicare tax is 1.45% of all your wages, with no cap — you pay it on every dollar you earn. This tax funds the Medicare program, which provides health insurance to people 65 and older and some younger people with disabilities. There is also an additional Medicare tax of 0.9% on wages above $200,000 (single filers) or $250,000 (married filing jointly), though most workers do not reach that threshold.

Federal income tax withholding is the largest deduction for most workers. The amount depends on your W-4 form and changes based on tax law. Unlike Social Security and Medicare, there is no fixed percentage — the IRS publishes withholding tables that your employer uses to calculate how much to take out. This money funds federal government operations: defense, infrastructure, federal employee salaries, and all other federal programs.

How your W-4 form controls how much is withheld

Form W-4, Employee's Withholding Certificate, tells your employer how much federal income tax to withhold. You fill it out when you start a job, and you can change it anytime. The form asks for your filing status (single, married, head of household), number of dependents, and whether you have other income or jobs.

If you claim more dependents or other adjustments, your withholding goes down and your take-home pay goes up. If you claim fewer, your withholding goes up and your take-home pay goes down. The goal is to have the right amount withheld so that when you file your tax return in April, you owe nothing and get no large refund — though some people prefer to have extra withheld as a forced savings method.

You should update your W-4 if you get married, have a child, take a second job, or have a major change in income. The IRS provides a W-4 calculator on its website to help you figure out what to claim. Your employer's human resources or payroll department can tell you how to submit a new W-4.

The difference between payroll taxes and income taxes

Payroll taxes and income taxes are not the same thing, though the terms are sometimes used loosely. Payroll taxes are the specific deductions from your paycheck: Social Security, Medicare, and federal income tax withholding. Income tax is the tax on your total income for the year, which you calculate on your tax return (Form 1040) in April.

The federal income tax withholding taken from your paycheck is an estimate of the income tax you will owe. When you file your return, you report all your income, claim deductions and credits, and calculate your actual tax liability. If you had too much withheld, you get a refund. If you had too little, you owe. Self-employed people do not have payroll taxes withheld; instead, they pay estimated taxes quarterly and then settle up on their return.

State and local payroll taxes vary by where you work

In addition to federal payroll taxes, most states and some cities withhold state and local income tax from your paycheck. The rates and rules vary widely. Some states have no income tax at all (Texas, Florida, Nevada, and others), so residents pay only federal payroll taxes. Other states have rates ranging from about 1% to over 13%, depending on your income.

Your pay stub will show state and local withholding as separate line items. If you move to a new state or take a job in a different state, you may need to update your state W-4 form (most states have their own version). If you work in one state but live in another, you may owe tax to both — your employer withholds based on where you work, but you may have to file a return in your home state too.

What happens if the wrong amount is withheld

If your employer withholds too much federal income tax, you will get a refund when you file your tax return. The IRS does not pay interest on refunds, so money you could have used during the year sits with the government instead. If you consistently get large refunds, updating your W-4 to claim more can put more money in your paycheck each week.

If your employer withholds too little, you will owe money when you file. If you owe a large amount, you can set up a payment plan with the IRS, but you will also owe interest and possibly penalties. To avoid this, review your withholding if your life changes — a new job, marriage, a second income, or a major raise. The IRS W-4 calculator can help you figure out whether you need to adjust.

Self-employed people and contractors do not have payroll taxes withheld at all. They must pay estimated taxes four times a year (Form 1040-ES) to avoid owing a large amount in April and facing penalties.

Frequently Asked Questions

Is payroll tax the same as my income tax?

No. Payroll tax is the money withheld from your paycheck for Social Security, Medicare, and federal income tax. Income tax is the tax you actually owe on your total yearly income, which you calculate on your tax return. The federal income tax withheld from your paycheck is meant to cover your income tax, but the actual amount you owe may be higher or lower.

Why do I pay Social Security tax if I might not collect it?

Social Security tax funds current retirees and disabled workers, not just your own future benefits. You build a record of earnings that determines your benefit amount if you retire, become disabled, or die. Even if you do not collect, your payments support the system. If you are not a U.S. citizen or have other visa status, you may be exempt — check with your employer's payroll department.

Can I stop paying payroll taxes?

No. Payroll taxes are mandatory for all employees. You cannot opt out of Social Security or Medicare, and your employer is required to withhold them. The only way to reduce payroll taxes is to earn less or to claim legitimate deductions on your W-4 (such as dependents or other income). Deliberately claiming false deductions is tax fraud.

What if I have two jobs — do I pay payroll taxes on both?

Yes. You pay Social Security and Medicare tax on all wages from all jobs. However, Social Security tax has a yearly cap, so if your combined wages exceed the cap, you may overpay Social Security tax. You can claim a credit for the overpayment on your tax return. Your employer withholds federal income tax based on what you claim on your W-4 for that job, so you may want to adjust your W-4 at your second job to account for your total income.

Do contractors and freelancers pay payroll taxes?

No. Contractors and self-employed people do not have payroll taxes withheld. Instead, they pay self-employment tax (Social Security and Medicare combined into one payment) when they file their tax return or through quarterly estimated tax payments. Self-employment tax is about 15.3% of net earnings, which is higher than employee payroll taxes because the contractor pays both the employee and employer share.