About BonusTaxCalc.com

BonusTaxCalc.com is a free, browser-based calculator that estimates federal withholding on a bonus or other supplemental wage payment. Calculations run locally in your browser. No account is required and no data is stored.

Purpose of This Calculator

This tool answers one narrow question: how much federal withholding might come out of a bonus? It applies the standard flat supplemental wage method used by the IRS — 22% for most bonuses, 37% when total supplemental wages exceed the high-threshold level.

Who This Tool Is For

This calculator is useful for employees checking a bonus paycheck, HR teams estimating withholding on supplemental wages, and anyone who wants a fast federal-only estimate before a payment date.

About the Network

BonusTaxCalc.com is part of the Calc-HQ financial calculator network, a collection of free browser-based utilities covering tax, salary, and compensation calculations.