W-4 Paycheck Withholding Calculator
See how your W-4 changes the federal tax withheld from each paycheck.
About this calculator
Your Form W-4 is the single biggest lever you control over how much federal income tax comes out of each paycheck. Fill it out one way and you get a fat refund in April but smaller paychecks all year; fill it out another way and you keep more each pay period but could owe at filing. This calculator shows exactly how each line of the W-4 moves the number, using the same IRS Publication 15-T percentage method your employer's payroll uses.
The math follows the IRS Worksheet 1A. Your taxable wages for the period are annualized, then Step 4(a) other income is added and Step 4(b) deductions are subtracted to get an adjusted annual wage. That figure is run through the 2025 rate schedule for your filing status — the STANDARD schedule if the Step 2 box is unchecked, or the higher Step-2-Checkbox schedule if you have two jobs or a working spouse. Step 3 credits (such as $2,000 per qualifying child) are subtracted, the result is divided back to your pay frequency, and any Step 4(c) extra withholding is added on top.
Use it to fine-tune withholding after a raise, a second job, marriage, or a new dependent. Checking the Step 2 box roughly doubles the rate schedule threshold split so two earners aren't under-withheld; adding a child in Step 3 lowers withholding by up to $2,000 a year; and Step 4(c) lets you add a flat dollar amount per paycheck if you want to close a projected shortfall. Pair it with the tax-refund estimator to compare a full year of withholding against your actual expected tax.
Frequently asked questions
What does the Step 2 checkbox on the W-4 do?
Checking Step 2(c) tells payroll you have two jobs (or a working spouse) so the standard deduction and lower brackets aren't double-counted. It switches your employer to a higher withholding schedule, taking out more per paycheck to avoid a balance due at filing.
How do I get a bigger paycheck instead of a big refund?
A large refund means you over-withheld all year. Claiming your eligible dependents in Step 3 and any extra deductions in Step 4(b) lowers withholding and raises your take-home pay. Aim to have withholding roughly match your actual tax so neither side owes much.
Does this include Social Security, Medicare and state tax?
No. This tool estimates only the federal income tax your employer withholds. Social Security (6.2%), Medicare (1.45%) and any state or local income tax are separate — use the take-home pay calculator to see your full net paycheck.
Why doesn't the W-4 have 'allowances' anymore?
The IRS redesigned Form W-4 in 2020 to remove withholding allowances. Instead you enter dollar amounts for dependents, other income and deductions directly, which the percentage method in this calculator uses.
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⚠️ Estimates 2025 federal income-tax withholding using the IRS Publication 15-T percentage method, for general guidance only — not tax advice. Actual payroll may round differently.