Bonus After Tax Calculator
US, 2026 tax year · figures follow that year's rules
Estimates the federal income tax, Social Security, Medicare and state withholding taken from a bonus paid in 2026, using either the flat 22% (37% above $1 million) percentage method or the Publication 15-T aggregate method, with an optional gross-up.
Your figures
Updates as you typeHow this is worked out
6 steps
- Federal income tax = 22% x 5000 = 1100
- Social Security = 6.2% x min(bonus, 184,500 - 0 already paid) = 310
- Medicare = 1.45% x 5000 = 72.5
- Additional Medicare = 0.9% x wages above 200,000 this year = 0
- State withholding (none) = 0
- Net bonus = 5000 - 1482.5 = 3517.5
Figures from US federal tax tables (IRS), 2026 rules and US state supplemental withholding rates, 2026 rules, checked 5 September 2026. Its 7 worked examples are re-run on every release, last on 15 September 2026. What changed · how reference data is kept current
Sources and references
7 sources
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What this calculator does
Estimates the federal income tax, Social Security, Medicare and state withholding taken from a bonus paid in 2026, using either the flat 22% (37% above $1 million) percentage method or the Publication 15-T aggregate method, with an optional gross-up.
How to use Bonus After Tax Calculator
Enter Bonus amount, Federal withholding method, Supplemental wages already paid this year, All wages already paid this year, Regular wages this pay period, Pay frequency, Form W-4 filing status, Form W-4 Step 2(c) box is checked, Form W-4 Step 3 credits (annual), Form W-4 Step 4(a) other income (annual), Form W-4 Step 4(b) deductions (annual), State, Custom state rate, Local or county rate, Gross up to a target net amount and Target net bonus. The calculator checks the values, applies the stated method, and updates the result without saving your figures.
What the result means
The result includes Net bonus after withholding, Gross bonus, Federal income tax withheld, Portion at or under the $1,000,000 threshold, Portion above $1,000,000 (37%), Aggregate: withholding on regular wages plus bonus, Aggregate: withholding on regular wages alone, Aggregate: net of the combined paycheque, Social Security (6.2%), Medicare (1.45%), Additional Medicare (0.9% over $200,000), State withholding, Local withholding, Total withheld, Total withholding as a share of the bonus, Grossed-up bonus needed for the target net and Method. Review the visible working and any warnings before using the answer for a decision.
Method and checks
The method cites IRS Publication 15 (Circular E), Employer's Tax Guide, Reminders: supplemental wage rate 22% (37% above $1 million), Social Security wage base $184,500; 26 CFR 31.3402(g)-1, Supplemental wage payments (mandatory flat rate on the excess over $1,000,000; optional flat rate conditions); IRS Publication 15-T, Federal Income Tax Withholding Methods, Worksheet 1A and the annual Percentage Method tables, among others. Its 7 built-in worked examples are checked on every full test run. The initial answer and working are rendered on the server, so they remain readable without JavaScript.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
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