Payroll taxes are the money your employer withholds from your paycheck for Social Security, Medicare, and federal income tax

When you receive a paycheck, the amount you take home is less than your gross pay because your employer removes money for taxes before you see it. These deductions fall into two categories: payroll taxes (Social Security and Medicare) and income tax withholding (federal, and sometimes state or local). Payroll taxes fund specific programs. Income tax withholding is an advance payment toward your annual tax bill. Both are required by law, and both appear as separate line items on your pay stub.

Understanding what each deduction funds and why it comes out helps you read your pay stub accurately and know what to expect when you file taxes. The amounts are set by federal law and do not change based on your personal situation — they are the same percentage for nearly every worker.

Key Takeaways

  • Social Security tax is 6.2 percent of your gross pay, and Medicare tax is 1.45 percent, for a combined 7.65 percent in payroll taxes that your employer also matches.
  • Federal income tax withholding is separate from payroll tax and varies based on your W-4 form, your income level, and your filing status.
  • Your pay stub shows gross pay, then lists each deduction separately so you can see exactly where your money goes.
  • Self-employed people pay both the employee and employer portion of payroll taxes, totaling 15.3 percent for Social Security and Medicare combined.
  • State and local income taxes are withheld in addition to federal taxes in most states, though a few states have no income tax.

Social Security and Medicare: The 7.65 Percent Payroll Tax

The largest mandatory payroll deduction for most workers is the combined Social Security and Medicare tax, which totals 7.65 percent of your gross pay. Social Security takes 6.2 percent and Medicare takes 1.45 percent. These percentages are fixed by federal law and apply to nearly all W-2 employees, regardless of income or filing status.

Your employer withholds this amount and also pays an equal 7.65 percent on your behalf — you do not see the employer portion on your check, but it goes to the same programs. This is why payroll tax is sometimes called a "matched" tax. The total cost to fund your Social Security and Medicare is 15.3 percent of your wages, split between you and your employer.

Social Security tax only applies to the first $168,600 of your annual income (this cap changes yearly). Once you earn above that amount in a calendar year, no more Social Security tax is withheld. Medicare tax, however, has no income cap — it applies to every dollar you earn. High earners also pay an additional 0.9 percent Medicare tax on income above $200,000 (single) or $250,000 (married filing jointly).

Federal Income Tax Withholding: What Varies by Person

Federal income tax withholding is separate from payroll tax and works differently. Instead of a fixed percentage, the amount withheld depends on information you provide on your W-4 form when you start a job. Your W-4 tells your employer how much federal tax to hold from each paycheck based on your expected annual income, filing status, number of dependents, and other adjustments.

The goal of withholding is to collect enough throughout the year so that when you file your tax return, you owe little or nothing — or receive a refund. If you withhold too much, you get money back. If you withhold too little, you owe when you file. The IRS publishes tax tables each year that employers use to calculate the correct withholding based on your W-4 answers.

You can adjust your withholding at any time by submitting a new W-4 to your employer. Many people change their W-4 after a major life event — marriage, divorce, a second job, or a child — or if they find they owe money or receive a large refund each year.

State and Local Income Taxes

In addition to federal withholding, most states require employers to withhold state income tax from your paycheck. The rate and rules vary widely by state. Some states have a flat tax rate; others use a progressive system with higher rates for higher incomes. Nine states have no income tax at all: Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, Wyoming, and New Hampshire (which taxes only investment income).

If you live in a state with income tax, you will see a separate state withholding line on your pay stub. Some cities and counties also impose local income taxes — this is common in Ohio, Pennsylvania, and parts of New York, among others. You may need to complete a state W-4 form in addition to your federal W-4, though many states now use the federal form or have simplified their own.

If you work in one state but live in another, the rules depend on where you work and where you live. Most states tax income earned within their borders, but some have reciprocal agreements. This situation is most common for people who live near state borders or work remotely for an out-of-state employer.

How Self-Employment Tax Works Differently

If you are self-employed — a freelancer, contractor, or small business owner — you pay both the employee and employer portions of Social Security and Medicare tax yourself. This is called self-employment tax and totals 15.3 percent (12.4 percent for Social Security, 2.9 percent for Medicare). You do not have an employer to match your contribution.

Self-employed people calculate self-employment tax on Schedule SE and pay it along with their federal income tax, usually in quarterly estimated tax payments. You can deduct half of your self-employment tax when you calculate your adjusted gross income, which provides some tax relief. Self-employment tax applies to net profit from your business, not gross revenue.

If you have both W-2 employment and self-employment income, you pay payroll tax on the W-2 wages and self-employment tax on the net profit. However, if your combined Social Security wages exceed the annual cap, you do not pay Social Security tax on self-employment income above that threshold.

Reading Your Pay Stub: Where to Find Each Deduction

Your pay stub is divided into sections: gross pay at the top, then deductions, then net pay (take-home). Payroll taxes and income tax withholding appear as separate line items so you can see exactly what was removed and why. A typical pay stub shows:

  • Gross Pay: Your total earnings before any deductions.
  • Social Security Tax: Listed as "FICA-SS" or "Social Security," showing 6.2 percent of gross pay.
  • Medicare Tax: Listed as "FICA-Medicare" or "Medicare," showing 1.45 percent of gross pay.
  • Federal Income Tax Withholding: Listed as "FIT" or "Federal Withholding," the amount based on your W-4.
  • State Income Tax: Listed as "SIT" or the state abbreviation, if applicable.
  • Net Pay: Your take-home after all deductions.

Some pay stubs also show year-to-date totals for each deduction, which helps you track how much you have paid in taxes so far this year. If you notice an error — a deduction that seems too high or too low — contact your payroll department or HR to verify your W-4 and income records.

Why Payroll Taxes Matter for Your Benefits

Payroll taxes are not just money disappearing from your check. Social Security tax funds your future Social Security retirement, disability, and survivor benefits. Medicare tax funds your Medicare coverage starting at age 65. The amount you pay in payroll taxes over your working life determines how much you receive in these benefits later.

Your employer reports your earnings and payroll taxes to the Social Security Administration each year. This record builds your "work history," which the government uses to calculate your benefit amount when you retire or become disabled. If you do not pay enough in payroll taxes over your lifetime, you may not be may have access to to full benefits.

Income tax withholding, by contrast, does not fund a specific benefit. It is simply an advance payment toward your annual federal tax bill. The IRS uses withholding to collect taxes throughout the year rather than asking for one large payment on April 15.

Frequently Asked Questions

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 benefit. It is a pay-as-you-go system. You pay in while working, and current workers will pay for your benefits when you retire. Even if you do not live to collect, your family may receive survivor benefits, and you build a record of coverage that protects you if you become disabled.

Can I opt out of payroll taxes?

No. Social Security and Medicare taxes are mandatory for all W-2 employees. The only exceptions are certain religious groups that have received IRS approval to be exempt, and some government employees hired before specific dates who are covered by alternative retirement systems. Self-employed people cannot opt out either, though they can reduce self-employment tax by deducting business expenses.

What happens if my employer does not withhold taxes?

You are still responsible for the taxes owed, even if your employer fails to withhold them. Report the issue to your state labor department or the IRS. You may also owe penalties and interest. If your employer is deliberately not withholding, this is a serious violation and should be reported immediately.

Do I get a refund if I overpay payroll taxes?

Social Security and Medicare taxes are not refundable — once withheld, that money goes to fund the programs. However, if you overpay federal income tax through withholding, you receive a refund when you file your tax return. This is why many people get a refund each year: they had too much withheld.

How do I know if my withholding is correct?

The IRS offers a withholding calculator on its website that compares your expected tax bill to what you have withheld so far. If the calculator shows you will owe or receive a large refund, you can adjust your W-4. Most people aim to break even or receive a small refund, though some prefer to owe a small amount to avoid overpaying the government.