Tax Withholding Calculator
Calculate how much federal or state tax will be withheld from each paycheck based on your gross pay and withholding rate. Helpful for verifying pay stubs or adjusting your W-4 allowances.
About this calculator
Tax withholding is the portion of your wages your employer sends directly to the government on your behalf before you receive your paycheck. The formula is: Withholding = (Gross Pay × Withholding Rate) / 100. Gross pay is your earnings before any deductions. The withholding rate is determined by your W-4 elections, filing status, and the IRS withholding tables. Withholding too little means you may owe a lump sum at tax time; withholding too much means you are giving the government an interest-free loan and will receive a refund. Checking your withholding at the start of each year — or after a major life event like marriage or a new job — helps you stay close to your actual tax liability and avoid penalties.
How to use
Say your gross bi-weekly pay is $2,500 and your effective withholding rate is 15%. Enter 2500 as Gross Pay and 15 as Withholding Rate. The calculator computes: Withholding = (2,500 × 15) / 100 = $375. So $375 is withheld each pay period for income taxes. Over 26 bi-weekly pay periods, that totals $9,750 withheld for the year — which you can then compare to your expected annual tax liability to see if you are on track.
Frequently asked questions
How do I determine the correct withholding rate for my W-4?
Your withholding rate depends on your filing status, number of dependents, additional income sources, and any deductions you plan to claim. The IRS Tax Withholding Estimator at irs.gov is the most accurate tool for calculating a precise rate. In general, single filers with one job and no dependents can use the standard withholding tables. If you have a second job, significant investment income, or major deductions, you should complete the W-4 worksheets carefully or enter a custom additional withholding amount to avoid an underpayment penalty.
What happens if too little tax is withheld from my paycheck?
If your total withholding for the year falls short of your actual tax liability, you will owe the difference when you file your return. If you underpay by more than $1,000 (and your withholding is less than 90% of the current year's tax or 100% of last year's tax), the IRS may also charge an underpayment penalty. This is why it is important to review your withholding after major income changes. Adjusting your W-4 mid-year can course-correct before the problem compounds.
Why does my employer withhold Social Security and Medicare taxes separately from income tax withholding?
Social Security and Medicare taxes — collectively called FICA taxes — are separate from federal income tax withholding and have their own flat rates set by law. As of 2024, Social Security is withheld at 6.2% on wages up to the annual wage base ($168,600), and Medicare is withheld at 1.45% on all wages. Income tax withholding, by contrast, varies based on your W-4 elections and income level. All three appear as separate line items on your pay stub, which is why your total withholdings are always higher than just the income tax component.