W-4 Withholding Calculator (2025)
See if your paycheck withholding is on track — and exactly what to put on your W-4 so you don't owe or over-withhold.
Your job & W-4 · 2025
On pace to owe
$834
You'll likely owe this at tax time — add withholding to avoid a surprise.
What to put on your W-4
Target withholding / check
$312
Extra to add (line 4c)
$33
If you're under-withheld, enter the “extra” amount on Step 4(c) of Form W-4 to break even. Claiming your dependents in Step 3 already lowers withholding automatically.
2025 federal estimate (uses the standard deduction). A close guide for adjusting your W-4 — not tax advice.
How this W-4 withholding calculator works
The W-4 controls how much federal income tax comes out of your paycheck. This calculator estimates your full-year tax from your salary, filing status and dependents, compares it to what you're currently withholding, and tells you whether you're on track for a refund, a balance due, or right on the money.
It then gives you a target withholding per paycheck and, if you're short, the exact extra amount to enter on Step 4(c) of your W-4 to break even.
Why adjusting your W-4 matters
Over-withholding feels nice in April but means a smaller paycheck all year — an interest-free loan to the IRS. Under-withholding leaves you with a surprise bill and possible penalties. Dialing in your W-4 keeps more of your money in each paycheck without the tax-time shock.
Big life changes — a raise, a second job, marriage, a new child, or side income — are the moments to re-check it. Run your numbers above, then update your W-4 with your employer.
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Frequently asked questions
What does the W-4 form actually do?
Your Form W-4 tells your employer how much federal income tax to withhold from each paycheck. Get it right and you break even at tax time; get it wrong and you either owe a bill or give the IRS an interest-free loan all year.
How do I know how much to withhold?
Compare your expected annual tax to what's being withheld. This calculator does that for you — enter your salary, status, dependents and current per-paycheck withholding, and it shows whether you're on track plus a target amount per check.
What is Step 4(c) on the W-4?
Step 4(c) is the 'extra withholding' line. If you're under-withheld (or have side income), enter an extra dollar amount per paycheck there to catch up so you don't owe at filing.
Should I claim my dependents on the W-4?
Yes — Step 3 of the W-4 reflects the Child Tax Credit and reduces your withholding accordingly. This calculator factors in $2,000 per qualifying child under 17.
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