What Are Tax Withholdings?

Tax withholding is money taken from your paycheck and sent to tax authorities during the year, so you pay taxes as you earn income instead of paying the full amount at tax-filing time. For employees, it usually includes federal income tax and Social Security and Medicare taxes, and it may also include state or local income taxes. Your employer uses your wages and, for federal income tax, the information on your Form W-4 to calculate the amount withheld. Withholding is not your final tax bill: when you file a return, the tax already paid is credited against what you owe. If too much federal income tax was withheld, you may receive a refund; if too little was withheld, you may owe more.

How Tax Withholding Works

The U.S. tax system generally operates on a pay-as-you-go basis. Employees pay federal income tax throughout the year through paycheck withholding. People who do not have enough tax withheld from wages may need to make estimated tax payments instead.

For an employee, the process is straightforward: the employer calculates withholding from payroll information, deducts the required amounts from wages, and deposits and reports the taxes to the government. When the employee files a tax return, the total tax owed is compared with payments already made, including withholding. The return settles the difference.

Employers have responsibilities to withhold, deposit, report, and pay employment taxes. The IRS's Employer's Tax Guide explains these employer obligations and covers federal income tax, Social Security tax, Medicare tax, and federal unemployment tax. Federal unemployment tax is generally paid by the employer rather than withheld from an employee's paycheck.

What May Be Withheld from Your Paycheck?

Your pay stub may show taxes alongside other deductions. Federal, state, and local taxes are distinct from benefit contributions or payments required by a legal order, even though all of them can reduce the amount you take home.

Federal Income Tax

Federal income tax withholding is an advance payment toward your annual federal income tax. The amount depends on your wages, pay frequency, and the withholding information you give your employer. Employees generally provide that information on Form W-4 when they start a job and can update the form when their circumstances change.

Marriage or divorce, a new child, a second job, a significant income change, or a change in deductions or credits may affect how much you want withheld. Two employees with similar wages can have different federal income tax withholding because their circumstances and Form W-4 information differ. For a closer look at this particular paycheck deduction, see federal income tax withholding.

Social Security and Medicare Taxes

Social Security and Medicare taxes are commonly grouped together as FICA taxes. Employers generally withhold both from employee wages and pay a matching employer share. These are separate from federal income tax withholding; learn more about how FICA differs from federal income tax.

Social Security tax applies only up to an annual wage limit. For 2026, the IRS states that employers generally withhold Social Security tax on an employee's wages up to $184,500. If someone works for more than one employer, the wage limit applies separately to each employer's payroll. The IRS discusses this and other withholding rules in Publication 505.

Medicare tax does not have the same annual wage limit, so standard Medicare withholding applies to all wages. An additional Medicare withholding requirement applies after an employee's wages from an employer exceed a set threshold during the calendar year. Someone with multiple jobs may have combined wages that affect their final tax even if no single employer's payroll reflects all of those wages.

State and Local Income Taxes

Depending on where you live and work, your paycheck may also include state or local income tax withholding. Rules vary by jurisdiction: some places do not tax wages through a state income tax, while others use their own forms, rates, and calculations. Your pay stub may label these amounts as state or local tax, or identify the relevant state or locality.

Which Paycheck Deductions Are Not Taxes?

Not every amount taken from gross pay is a tax withholding. A pay stub may also show health, dental, or vision insurance premiums; retirement contributions; health savings account or flexible spending account contributions; union dues; or wage garnishments and other court-ordered payments. These deductions have different purposes and rules from taxes. A pay stub helps you distinguish the amounts withheld for taxes from other deductions and see how each affects your take-home pay.

When Should You Review Your Withholding?

Withholding is based on the information available to your employer and may not automatically match your tax situation after it changes. Review it after starting or changing jobs, adding a second job, a spouse starting work, a significant raise, marriage or divorce, having or adopting a child, or receiving new investment income. An unexpectedly large tax bill or refund from the previous year can also be a reason to review your settings.

A large refund means you paid more during the year than your final federal income tax bill required. That may be welcome, but it also means some money was unavailable to you in your paychecks. Reducing withholding too much can have the opposite result and leave you owing at filing time.

The IRS's free Tax Withholding Estimator can help estimate federal income tax withholding from current paychecks for the following year's tax return. The IRS says the tool reflects changes to credits and deductions under the Working Families Tax Cuts. You can use its estimate when deciding whether to submit an updated Form W-4 to your employer.

How Withholding Affects Take-Home Pay

Consider an employee who earns $1,500 in gross pay during a pay period. The employer withholds applicable federal income, Social Security, and Medicare taxes, along with any state or local income taxes that apply. The employee may also have benefit deductions, such as health insurance or retirement contributions. The remaining amount is net pay, which is deposited into the employee's bank account.

Gross pay is divided among take-home wages, tax payments, and other selected or required deductions. The amount withheld for federal income tax is credited toward the employee's final federal tax obligation when the annual return is filed. Social Security and Medicare withholding are separate payroll taxes and are not simply part of that federal income tax calculation.

What Should You Check on Your Pay Stub?

Review your pay stub when you start a job and after changes to your pay or withholding. Check that your wages and deductions appear as expected, and compare the tax lines with earlier pay stubs if an amount changes. If you update your Form W-4, check a subsequent pay stub to confirm the change has taken effect. For help with the process of changing workplace withholding information, contact your payroll or HR team.

For federal income tax, employees who meet the applicable conditions may be exempt from withholding; the rules and the required Form W-4 claim are specific. See who may be exempt in 2026 for more detail.

*This article is for general informational purposes only and is not legal advice.