Bonus After Tax Calculator

The gross supplemental wage payment. Ignored when the gross-up option is on.
The flat rate is allowed only if income tax was withheld from your regular wages this year or last. Either way, 37% applies to any part above $1,000,000 of supplemental wages for the year.
Earlier bonuses and commissions from this employer in the calendar year; sets where the $1,000,000 threshold falls.
Regular plus supplemental wages from this employer before this payment; drives the Social Security wage base and the $200,000 Additional Medicare trigger.
The regular wages paid with (or most recently before) the bonus. Used by the aggregate method, and by Wisconsin to estimate annual gross salary (wages x pay periods plus the bonus) for its tiered flat percentages.
Overrides the table when above 0. Required for states without a verified flat supplemental rate.
Added on top of the state rate: for example a Maryland county rate (2.25% to 3.30%; nonresidents 2.25%), an Indiana county rate or the New York City supplemental rate.
Gross-up only: the amount the employee should actually receive.
Net bonus after withholding
3,517.50 USD
Bonus Tax Calculator
Gross bonus
5,000.00 USD
Federal income tax withheld
1,100.00 USD
Portion at or under the $1,000,000 threshold
5,000.00 USD
Portion above $1,000,000 (37%)
0.00 USD
Social Security (6.2%)
310.00 USD
Medicare (1.45%)
72.50 USD
Additional Medicare (0.9% over $200,000)
0.00 USD
State withholding
0.00 USD
Local withholding
0.00 USD
Total withheld
1,482.50 USD
Total withholding as a share of the bonus
29.65 %
Method
Percentage method (22% flat, 37% above $1,000,000)
Worked out from IRS Publication 15 (Circular E), Employer's Tax Guide, Reminders: supplemental wage rate 22% (37% above $1 million), Social Security wage base $184,500 and 6 other sources.
Withholding is not the final tax. The flat 22% (and any state flat rate) is reconciled against your actual marginal rate on your income tax return; you may owe more or get a refund.
The flat 22% may be used only if income tax was withheld from your regular wages in the current or preceding year; otherwise the aggregate method is required.
Withholding is a prepayment, not the tax you owe: the 22% flat rate is settled against your real marginal rate on Form 1040. State rules change every January and several changed mid-2026; confirm with your payroll department.

How this is worked out

6 steps
  1. Federal income tax = 22% x 5000 = 1100
  2. Social Security = 6.2% x min(bonus, 184,500 - 0 already paid) = 310
  3. Medicare = 1.45% x 5000 = 72.5
  4. Additional Medicare = 0.9% x wages above 200,000 this year = 0
  5. State withholding (none) = 0
  6. Net bonus = 5000 - 1482.5 = 3517.5

Results are general information, not financial, tax, legal, medical or engineering advice.