W-4 Withholding Calculator — Estimate Federal Tax Withheld Per Paycheck

Every line you fill in on Form W-4 is really a dial: it tells your employer how aggressively to pull federal income tax out of each paycheck. This calculator answers one practical question — what should come out of my check, and will that leave me owing the IRS or getting money back next April? It estimates the federal income tax withheld per paycheck (and the yearly total that adds up to) so you can tune the form before you hand it in, rather than discovering you guessed wrong at filing.

A crucial distinction up front: withholding is a running prepayment, not your final tax. Each paycheck your employer sends an installment to the IRS based on what your W-4 implies your year will look like. At filing you reconcile those installments against your real bill — too much withheld means a refund, too little means a balance due. This tool estimates only the amount withheld each pay period; it does not compute your final annual tax liability. For that bottom-line figure — the number that lands on your 1040 — use the Federal Income Tax Calculator on this site.

Here is how the withholding estimate is built. We start from your wages and back out your filing-status deduction so we are working with roughly the income the IRS will actually tax. For tax year 2025 that subtraction is $15,750 for single filers and $31,500 for couples filing jointly — bigger amounts than older worksheets list. The remaining income is then run through the seven 2025 rate tiers (10, 12, 22, 24, 32, 35 and 37 percent), which stack rather than apply all at once: each tier only touches the dollars that fall inside its own band. We trim that yearly tax by your dependent credits — counted on Step 3 of the W-4 at up to $2,000 per qualifying child — and then spread the result across your pay schedule (52 weekly, 26 biweekly, 24 semi-monthly or 12 monthly checks). Finally we tack on any flat extra withholding you entered on Step 4(c). The total is your estimated per-paycheck federal withholding.

Worked example built around the paycheck. Take a single filer earning $60,000, claiming one child, paid biweekly. After the $15,750 deduction the taxable figure is $44,250; layering the 2025 single tiers gives roughly $5,072 of tax for the year, and the $2,000 child credit knocks that down to $3,072. Spread over 26 paychecks, the W-4 implies about $118 of federal income tax per check. If that filer would rather pad each check to cover side income, entering, say, $40 on Step 4(c) lifts the withholding to roughly $158 a paycheck — a direct lever you control on the form.

The single most common reason people who do everything else right still owe in April: a second job or a working spouse. Each employer withholds as though its salary is your only income, so both lean on the lowest tiers and the combined total comes up short — you end up under-withheld. Step 2 of the W-4 (check the box for multiple jobs, or add a dollar amount) closes that gap. Remember this is a planning estimate covering federal income tax withholding only — it leaves out Social Security, Medicare, state withholding and itemized deductions, and for an official, line-by-line number the IRS Tax Withholding Estimator at irs.gov is the authoritative tool.