About BonusTaxCalc.com
BonusTaxCalc.com estimates what gets withheld from a bonus or supplemental wage payment. It covers federal supplemental withholding (22% and the 37% rate above $1M), Social Security, Medicare, and the additional Medicare surcharge — so you can see the real gap between the bonus you were promised and the amount that reaches your bank account.
Who this is for
Anyone who received a bonus and wants to understand why the deposit is smaller than expected. Also useful for comparing job offers with different bonus structures, estimating signing bonuses, or planning around commission payouts.
How it works
Enter your bonus amount, year-to-date supplemental wages, and year-to-date total wages. The calculator applies IRS Publication 15 supplemental withholding rules plus FICA taxes to show total withholding and your net bonus.