Sources verified · May 18, 2026

Your bonus, after taxes.

Two federal withholding methods, side-by-side. We show you what each one nets to your bank — and which one matches what you actually owe at year-end. Sources cited.

The full bonus before any taxes or 401(k) deferral.

Used to find your marginal tax bracket. Enter 0 if this bonus is your only wage income this year.

This decides which federal withholding method your employer is allowed to use. A separate check can use the flat 22%; a bonus folded into a regular paycheck must use the aggregate method.

Optional — only if it applies to you

If your employer lets you defer a percentage of bonuses into your pre-tax 401(k). Reduces federal and state withholding but not FICA.

From your latest pay stub's year-to-date gross. Sharpens Social Security and Medicare for a bonus paid early in the year — leave blank to estimate from your salary.

Also from your pay stub's year-to-date totals. Shown as context for why your actual check may differ; it doesn't change the figures.

No ads or lead-gen

New here? See it work with example numbers:

What this tool does and doesn’t do

  • Does: federal supplemental withholding (flat 22%, plus 37% on any portion over $1M per IRS Pub 15-T §7), the aggregate marginal-bracket method, FICA with full Social Security wage-base and additional Medicare interaction, and per-state aggregate-method withholding for any state + DC.
  • Doesn’t yet: per-state supplemental flat rates (some states publish their own, e.g. CA 10.23%, GA 5.75% — we use the aggregate-method approximation for state), equity comp like RSUs (separate tool), prior-bonus tracking for the $1M federal supplemental threshold, or city / local taxes.
  • This is a planning estimate. It is not tax advice. Confirm important decisions with your employer's payroll team or a qualified tax professional.