The federal payroll tax rate depends on what type of tax and your income level

Federal payroll withholding is not a single rate. Your employer withholds money for three separate taxes: Social Security, Medicare, and federal income tax. Social Security and Medicare have fixed rates set by law. Federal income tax withholding varies based on your income, filing status, and the W-4 form you fill out when you start a job.

As of 2024, Social Security withholding is 6.2% of your gross pay (up to an annual income cap), and Medicare withholding is 1.45% of all gross pay. These rates have been the same for years and change only when Congress passes new legislation. Federal income tax withholding has no fixed rate — it is calculated using IRS tables and your W-4 answers.

Your employer withholds all three amounts from each paycheck and sends them to the federal government on your behalf. The total withheld is usually between 15% and 25% of your gross pay, though this varies widely depending on your income, deductions, and how you filled out your W-4.

Key Takeaways

  • Social Security withholding is 6.2% of gross pay up to the annual wage base ($168,600 in 2024), and Medicare withholding is 1.45% of all gross pay with no income cap.
  • Federal income tax withholding is calculated using IRS tables based on your W-4 form, your pay frequency, and your filing status — there is no single fixed rate.
  • You can adjust your federal income tax withholding by submitting a new W-4 to your employer at any time during the year.
  • Self-employed people pay both the employee and employer portions of Social Security and Medicare (15.3% combined) and must pay estimated federal income tax quarterly.

Social Security and Medicare withholding rates are fixed by law

Social Security tax is 6.2% of your wages, but only up to a wage base limit. In 2024, that limit is $168,600. Once you earn more than that in a calendar year, your employer stops withholding Social Security tax for the rest of the year. Medicare tax is 1.45% of all your wages with no income limit — you pay it on every dollar you earn.

Together, Social Security and Medicare are called FICA taxes (Federal Insurance Contributions Act). Your employer also pays an equal amount (6.2% for Social Security and 1.45% for Medicare) on your behalf. These employer contributions do not come out of your paycheck, but they are part of your total compensation cost to the company.

If you earn more than $200,000 as a single filer (or $250,000 if married filing jointly), an additional 0.9% Medicare tax is withheld from your pay. This extra tax has no wage base cap and continues for all income above the threshold.

Federal income tax withholding is based on your W-4 form

Federal income tax withholding does not have a set percentage. Instead, your employer uses the W-4 form you completed when hired to calculate how much to withhold from each paycheck. The IRS publishes withholding tables that account for your pay frequency (weekly, biweekly, monthly), your filing status, and the number of dependents and other adjustments you claim on your W-4.

The W-4 form asks you to estimate your annual income, number of dependents, and other income sources. Based on your answers, the IRS tables tell your employer how much federal income tax to withhold. If you claim zero dependents and no adjustments, more tax is withheld. If you claim dependents or other adjustments, less is withheld.

You can change your W-4 at any time during the year. If you are having too much withheld and want a larger paycheck, you can submit a new W-4 claiming more dependents or adjustments. If you are having too little withheld and owe money at tax time, you can submit a new W-4 to increase withholding.

How to estimate your total payroll withholding

To see what percentage of your gross pay is being withheld, add up the three amounts: Social Security (6.2% up to the wage base), Medicare (1.45% plus 0.9% if applicable), and federal income tax (varies). For most workers earning under $200,000, the combined withholding is roughly 7.65% for Social Security and Medicare, plus whatever your federal income tax withholding is.

Your pay stub shows the exact dollar amounts withheld for each tax. If you want to know the percentage, divide each withholding amount by your gross pay for that period. Over a full year, most workers see total federal withholding between 15% and 25% of gross income, though this depends heavily on your income level and W-4 choices.

The IRS provides a Tax Withholding Estimator tool on its website (irs.gov) that can help you determine whether your current withholding is correct. You enter your income, filing status, and other details, and the tool tells you whether you should adjust your W-4.

Self-employed workers pay both employee and employer portions

If you are self-employed, you do not have an employer to withhold taxes. Instead, you pay self-employment tax, which is 15.3% total: 12.4% for Social Security (on income up to the annual wage base) and 2.9% for Medicare (on all income). This is double the employee rate because you are paying both the employee and employer portions.

Self-employed people must also pay federal income tax, but there is no automatic withholding. Instead, you are required to make estimated tax payments four times a year (quarterly) to the IRS. These payments cover both self-employment tax and federal income tax. If you do not pay enough in estimated taxes, you may owe a penalty when you file your annual return.

To calculate your estimated tax payments, you estimate your annual net income, calculate self-employment tax on that income, add your expected federal income tax, and divide by four. Many self-employed people use tax software or work with a tax professional to get this right.

Withholding changes based on your life circumstances

Your W-4 withholding should change when your life changes. If you get married, have a child, take a second job, or experience a major change in income, you should review your W-4. The IRS recommends checking your withholding at least once a year, especially if your situation has changed.

If you had a large refund last year, you are having too much withheld. If you owed money, you are having too little withheld. In either case, you can adjust your W-4 to get closer to the right amount. The goal is to have your withholding match your actual tax liability as closely as possible, so you do not overpay or underpay during the year.

You can submit a new W-4 to your employer's payroll department at any time. There is no limit to how many times you can change it. Your new withholding takes effect on the next paycheck after your employer processes the form.

Frequently Asked Questions

Why do I pay Social Security tax on only part of my income?

Social Security has a wage base limit because the program is designed to replace a portion of your pre-retirement income, not all of it. High earners pay the same maximum Social Security tax as middle-income earners, but they do not receive proportionally higher benefits. Medicare has no wage base cap, so you pay 1.45% on all your earnings.

Can I avoid federal income tax withholding?

You can claim exemption from federal income tax withholding on your W-4 only if you had no tax liability last year and expect none this year. This is rare and only applies to federal income tax, not to Social Security and Medicare. Most workers cannot claim exemption.

What happens if my employer withholds the wrong amount?

If your employer withholds incorrectly, you will discover it when you file your tax return. If too much was withheld, you get a refund. If too little was withheld, you owe money. You can also adjust your W-4 during the year if you notice the withholding is wrong.

Do state and local taxes use the same rates as federal withholding?

No. State and local income tax rates vary by location and are separate from federal withholding. Some states have no income tax. Your employer withholds state and local taxes based on your state's rules and your W-4 for that state.