Private Bonus Tax Estimator — No Compensation Data Stored
Find out how much of your bonus you will actually take home after federal income tax, state tax, Social Security, and Medicare. Supports the flat supplemental rate (22%) and aggregate method. 100% private — your bonus and salary data never leave your device.
How Bonus Taxes Work in the US
Bonuses are classified as "supplemental wages" by the IRS. Employers can withhold taxes using two methods: the flat rate method (22% federal on bonuses up to $1 million) or the aggregate method (adding the bonus to your regular paycheck and withholding based on the combined amount).
Flat Supplemental Rate Method
- Federal: Flat 22% on bonuses up to $1 million (37% above $1M)
- Social Security: 6.2% up to annual wage cap ($168,600)
- Medicare: 1.45% on all wages (+ 0.9% above $200K)
- State Tax: Varies by state (0% to 13.3%)
Aggregate Method
The employer adds the bonus to your regular paycheck, calculates withholding on the total as if it were a single payment, then subtracts the tax already withheld on your regular pay. This often results in higher withholding, especially if the combined amount pushes you into a higher bracket.
Flat Rate vs Aggregate: Which Is Better?
The flat rate method (22%) is simpler and often results in lower withholding for high earners whose marginal rate exceeds 22%. The aggregate method may over-withhold because it temporarily treats the bonus + salary as your normal pay rate. Either way, you will reconcile at tax filing time.
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