Tax withholding is the portion of your income that an employer or other payer deducts from your pay and sends directly to the government to cover the taxes you owe on that income. For most workers, that means federal income tax, Social Security tax at 6.2%, and Medicare tax at 1.45% come out of every paycheck before the money hits your account. The system exists because federal tax is pay-as-you-go: you owe tax on income as you earn it, not in a single payment the following April.1Internal Revenue Service. Pay as You Go, so You Won’t Owe: A Guide to Withholding, Estimated Taxes and Ways to Avoid the Estimated Tax Penalty Federal law requires employers paying wages to withhold income tax and remit it on a set schedule.2Office of the Law Revision Counsel. 26 U.S. Code 3402 – Income Tax Collected at Source Spreading your tax across the year keeps you from facing a large lump sum at filing time.
What Gets Withheld From Your Paycheck
Several separate federal taxes come out of a typical paycheck, each funding a different program. Together they account for the gap between your gross pay and your take-home amount.
Federal Income Tax
Federal income tax is the largest withholding item for most workers. The amount deducted depends on your wages, filing status, and the details you provide on Form W-4. Income tax withholding uses graduated brackets, so the percentage taken out rises as your pay rises, unlike the flat-rate payroll taxes below.
Social Security and Medicare
Payroll taxes under the Federal Insurance Contributions Act fund Social Security and Medicare. Social Security tax applies at a flat 6.2% on wages up to $184,500 in 2026; earnings above that cap are not subject to Social Security tax.3Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates Medicare tax applies at 1.45% on all wages with no cap.4Social Security Administration. Contribution and Benefit Base Your employer matches both amounts, paying an identical 6.2% and 1.45% on your behalf.
Additional Medicare Tax on High Earners
An extra 0.9% Medicare tax applies to wages that exceed $200,000 in a calendar year. Your employer must begin withholding this additional tax once your year-to-date wages cross the $200,000 mark, regardless of your filing status, and does not match this portion. When you file, the actual threshold depends on filing status: $250,000 for married filing jointly, $125,000 for married filing separately, and $200,000 for all other filers.5Internal Revenue Service. Topic No. 560, Additional Medicare Tax If your paycheck withholding turns out to be too much or too little based on your household situation, you reconcile the difference on your return.
How Form W-4 Sets Your Withholding Amount
Your employer uses IRS Form W-4 to calculate how much federal income tax to deduct from each paycheck. The form asks for three main pieces of information:
- Your filing status (single, married filing jointly, or head of household), which determines the tax brackets and standard deduction used in the calculation.6Internal Revenue Service. Form W-4, Employee’s Withholding Certificate
- Whether you hold more than one job or your spouse works. Step 2 accounts for combined income so too little is not withheld across paychecks.
- Dependents and other adjustments. The 2026 form gives $2,200 per qualifying child and $500 per other dependent, and it lets you add expected itemized deductions or request extra dollars withheld each pay period.
If you never submit a W-4, your employer must withhold as though you are a single filer with no adjustments. That is not necessarily the highest possible rate, but it will usually be more than you would owe if you filled out the form accurately.7Internal Revenue Service. FAQs on the 2020 Form W-4
Claiming Exemption
You can claim full exemption from federal income tax withholding on Form W-4 if you had no federal income tax liability last year and expect none this year.6Internal Revenue Service. Form W-4, Employee’s Withholding Certificate This mostly applies to low earners and students whose income falls below the filing threshold. Exemption only stops income tax withholding; Social Security and Medicare still come out. And it expires: to keep it in place, you must submit a fresh W-4 by February 16 of the following year.
Other Income That Has Tax Withheld
Withholding is not limited to regular wages. Several other income types carry their own rules and rates.
Bonuses and Other Supplemental Wages
Bonuses, commissions, overtime, back pay, and similar off-cycle payments are classified as supplemental wages.8eCFR. 26 CFR 31.3402(g)-1 – Supplemental Wage Payments When your employer identifies them separately from your regular pay, it can withhold a flat 22% for federal income tax instead of using the graduated rates from your W-4.9Internal Revenue Service. Publication 15, Employer’s Tax Guide Supplemental wages from a single employer above $1 million in a calendar year are withheld at 37% on the amount over that threshold.
Gambling Winnings
Gambling winnings face 22% federal withholding once the payout exceeds $5,000, and for certain wager types the winnings must also be at least 300 times the amount bet.10Office of the Law Revision Counsel. 26 USC 3402 – Income Tax Collected at Source – Section: Extension of Withholding to Certain Gambling Winnings State lottery winnings use the $5,000 threshold without the 300-times rule. Slot machines, keno, and bingo are exempt from this automatic withholding, but you still owe income tax on those amounts when you file.
Pensions, Annuities, and Retirement Distributions
Periodic pension and annuity payments are withheld on by default, calculated much like wages. You can change the amount or opt out by giving the payer Form W-4P; if you don’t, the payer treats you as single with no adjustments.11Internal Revenue Service. Topic No. 410, Pensions and Annuities Lump-sum distributions from a 401(k), 403(b), or governmental 457(b) that are eligible for rollover carry a mandatory 20% withholding on the taxable portion, even if you intend to roll the money into another retirement account.12Internal Revenue Service. 2026 Form W-4R, Withholding Certificate for Nonperiodic Payments and Eligible Rollover Distributions Choosing a direct rollover, where the funds move straight from one plan or IRA to another without passing through you, avoids the 20% hit.
Payments to Nonresident Aliens
Income paid to foreign individuals who are not U.S. residents, such as royalties, rents, or service fees, is generally withheld at 30% unless a tax treaty reduces or eliminates the rate.13Internal Revenue Service. Instructions for Form 1042-S (2026) These amounts are reported on Form 1042-S rather than Form W-2.
Unemployment Compensation
Withholding on unemployment benefits is voluntary. If you request it by submitting Form W-4V to your state unemployment office, the only rate available is a flat 10%.14Internal Revenue Service. Form W-4V, Voluntary Withholding Request Because 10% may be lower than your effective tax rate, you could still owe a balance at filing time.
Backup Withholding
Backup withholding kicks in on non-wage payments like interest, dividends, rents, royalties, and nonemployee compensation when a payee fails to provide a correct taxpayer identification number or the IRS notifies the payer that the number on file is wrong. The 2026 rate is 24%.9Internal Revenue Service. Publication 15, Employer’s Tax Guide If you receive Form 1099 income, the payer will typically ask you to complete Form W-9 to certify your TIN. Skipping that or giving a wrong number can trigger the 24% withholding on every payment until it’s fixed. Anything withheld is credited against your tax when you file, just like regular withholding.
Income That Has No Withholding
Not every taxable income stream has tax taken out at the source. Self-employment earnings, freelance income, rental income, investment gains, and alimony are the common ones with no payer withholding on your behalf.15Internal Revenue Service. About Form 1040-ES, Estimated Tax for Individuals Pay-as-you-go still applies. You handle it yourself through quarterly estimated tax payments on Form 1040-ES, due roughly in April, June, September, and January. If you also draw a paycheck, another option is to raise the withholding on your W-4 enough to cover the tax on your side income, which spares you from filing separate estimated payments.1Internal Revenue Service. Pay as You Go, so You Won’t Owe: A Guide to Withholding, Estimated Taxes and Ways to Avoid the Estimated Tax Penalty
Reconciling at Tax Time
After the year ends, you compare what was withheld against what you actually owe. Your employer sends Form W-2 by the end of January showing total wages and the amounts withheld for federal income tax, Social Security, and Medicare.16Internal Revenue Service. About Form W-2, Wage and Tax Statement Those figures go onto your Form 1040.
If your total withholding plus any estimated payments exceeds your actual liability, you get a refund for the difference. If it falls short, you owe the balance. A small amount due is normal. A large shortfall can bring an underpayment penalty.
Avoiding an Underpayment Penalty
The IRS charges an underpayment penalty when you owe $1,000 or more at filing and didn’t pay enough during the year. Two safe harbors let you avoid it: your withholding and estimated payments together covered at least 90% of your current-year tax, or they equaled at least 100% of last year’s tax.17Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty If your adjusted gross income was above $150,000 in the prior year ($75,000 if married filing separately), the prior-year threshold rises to 110%.
Checking and Adjusting Your Withholding
A new job, a marriage, a new child, or starting a side business can throw your withholding off. The IRS offers a free Tax Withholding Estimator that walks you through income, deductions, and credits to show whether you’re on track for the year.18Internal Revenue Service. Tax Withholding Estimator Based on the result, you can hand a new Form W-4 to your employer at any time; there is no limit on how often you update it. Checking once a year, or whenever your finances shift, is what keeps you clear of both a surprise bill and an oversized refund that locked up money you could have used.