Idaho Bonus Tax Calculator (2026)
Idaho withholds 5.3% state income tax on bonuses, on top of the federal 22% and 7.65% FICA.
Idaho rules for bonuses
Optional flat supplemental rate. Published rates: 5.3% for separately issued supplemental payments: bonuses, commissions, overtime, accumulated sick leave, severance, awards, prizes, back pay, retroactive pay.
- Alternative: combine with regular wages and treat as one payment
- Withholding tables revised 2026-07-23 (Idaho Child Tax Credit sunset, allowance now $0); used prospectively
Compute withholding one of these ways: Combine the supplemental payment with regular wages and treat it as a single payment. Multiply the separately-issued supplemental payment by 5.3%.
Local taxes: None
Take-home bonus by amount
| Bonus | Federal (22%) | FICA | State | Take-home |
|---|---|---|---|---|
| $1,000 | $220 | $77 | $53 | $651 |
| $2,500 | $550 | $191 | $133 | $1,626 |
| $5,000 | $1,100 | $383 | $265 | $3,253 |
| $10,000 | $2,200 | $765 | $530 | $6,505 |
| $20,000 | $4,400 | $1,530 | $1,060 | $13,010 |
| $50,000 | $11,000 | $3,825 | $2,650 | $32,525 |
Sources
Frequently asked questions
What is the bonus tax rate in Idaho?
Idaho withholds 5.3% on bonuses when the employer chooses the flat supplemental rate, on top of the federal 22% and 7.65% FICA.
How much of a $10,000 bonus do I keep in Idaho?
About $6,505 for a single filer earning $85,000: $2,200 federal, $765 Social Security and Medicare and $530 state.
Will I get some of the bonus tax back?
Possibly. The 22% federal rate is only withholding. At tax time your bonus is taxed at your bracket (22% at this salary), and Idaho's flat supplemental rate can also differ from your actual state rate.