2026 IDAHO BONUS TAX CALCULATOR
Idaho Bonus Tax Calculator 2026
Estimate how much of your Idaho bonus you keep after federal supplemental withholding, FICA, and Idaho state taxes. Compare the IRS percentage method (22% federal) vs aggregate withholding.
Loading bonus tax calculator…
How Idaho taxes your bonus paycheck
Idaho applies a supplemental withholding rate on bonus payments in addition to the federal 22% rate. The combined withholding can make a bonus look heavily taxed, though your final liability depends on total annual income.
Example: $10,000 bonus on $$75,000 salary
Single filer, biweekly pay — percentage method (22% federal supplemental + state supplemental rate).
| Gross bonus | $10,000 |
| Federal tax withheld | -$2,200 |
| State tax withheld | -$580 |
| Social Security | -$620 |
| Medicare | -$145 |
| Net bonus (percentage method) | $6,455 |
Aggregate method net bonus on this example: $6,489 (engine-computed delta vs salary-only withholding).