Enter your bonus amount and your annual regular salary. The salary matters because it determines your marginal tax bracket and whether part of the bonus crosses Social Security or Additional Medicare thresholds.
Pick your filing status, then choose a withholding method. The percentage method applies a flat 22% federal rate and is what most employers use when the bonus is paid on a separate check — it's simple and predictable. The aggregate method combines the bonus with your regular paycheck, taxes the total as if it were normal wages, then subtracts what was already withheld. Employers use it when the bonus is bundled into a single payroll run.
The method matters because the percentage method often over-withholds for middle earners (your true marginal bracket is 12% or 22%, but they take 22% off the top) and under-withholds for high earners whose marginal rate is 32% or 35%. The aggregate method tracks your actual bracket more closely but is harder to predict in advance.
Set your state tax rate — 0% for states like Texas, Florida, Washington, and Nevada; up to ~13% for California top earners. The calculator splits out federal withholding, FICA (Social Security + Medicare), state withholding, and shows your net take-home plus a note on the gap between withholding and what you'll actually owe at tax time.