Bonus Tax Calculator — How Much of Your Bonus Will You Actually Keep?

How to use

1. Open this page on any device — no signup needed.
2. Fill in the fields above.
3. Get your result instantly — nothing is uploaded.

About this tool

The IRS lets employers withhold bonus tax two ways: a flat 22% supplemental rate, or the aggregate method (bonus added to your regular paycheck, withholding at your W-4 rate). Either way the final tax settles at your real bracket at filing — big bonuses can push marginal income into higher brackets, but the bonus itself is never “taxed at 50%” no matter what your payslip implied. This calculator shows both methods plus FICA and editable state.

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