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Idaho Bonus Paycheck Calculator

A bonus paid in Idaho is withheld at the flat 22% federal supplemental rate in 2026 (37% on amounts above $1 million), plus FICA of 7.65% and a flat 5.3% Idaho income tax. That is roughly 34.9% withheld up front: withholding, not your final tax bill.

How are bonuses taxed in Idaho?

In Idaho, bonus withholding is typically 22% federal (the supplemental rate) plus 5.3% Idaho income tax plus 7.65% FICA: about 34.9% up front. Withholding isn't your final tax: at filing time a bonus is ordinary income, so any over-withholding comes back as a refund. Against the 6 states Idaho borders, the same a $10,000 bonus is worth $6,505 here: Nevada keeps $530 more ($7,035), Wyoming keeps $530 more ($7,035), Washington keeps $391 more ($6,896), Utah keeps $80 more ($6,585), Montana leaves $35 less ($6,470) and Oregon leaves $405 less ($6,100). Nevada, Utah, Washington and Wyoming are the only borders worth crossing for the tax alone.

Calculate your exact bonus take-home pay

Your bonus take-home

$3,253

from $5,000 bonusFor a $5,000 bonus · Idaho · single

Take-home 65%Taxes 35%
Bonus amount$5,000
Federal tax−$1,100
State tax−$265
Social Security−$310
Medicare−$73
Net bonus$3,253

Estimate based on 2026 federal and Idaho tax rules updated Oct 2026 How we calculate

Your details

Taxation method

Most common: a flat 22% federal rate is withheld on the bonus.

More options Base salary

What a bonus is actually worth in Idaho

On top of a $75,000 salary in Idaho, here is what each extra dollar survives federal tax, Idaho income tax and FICA in 2026:

BonusGrossIdaho taxYou keepShare kept
$5,000 bonus$5,000$265$3,25365.0%
$10,000 bonus$10,000$530$6,50565.0%
$25,000 bonus$25,000$1,325$16,26365.0%

Idaho takes about 5.3% of that money on top of the 22% federal marginal rate and 7.65% FICA.

How Idaho ranks on bonuses

Across all 50 states and DC, Idaho ranks 34th for what a $10,000 bonus leaves in 2026, tied with 1 other state that levy no income tax on wages. That is $60 less than the median state ($6,565), and $488 more than California, where the same a $10,000 bonus leaves $6,017.

The best outcome anywhere is $7,035 in Alaska and the other states with no wage income tax, $530 more than Idaho keeps.

Idaho bonuses against the states next door

Crossing a state line changes what the same bonus is worth without changing what you are paid. Here is a $10,000 bonus in Idaho against the states it borders:

StateState income taxYou keepvs Idaho
Idaho$530$6,505—
Montana$565$6,470$35 less
NevadaNone$7,035$530 more
Oregon$875$6,100$405 less
Utah$450$6,585$80 more
WashingtonNone$6,896$391 more
WyomingNone$7,035$530 more

How Idaho bonus withholding works

Short answer: your employer withholds a flat 22% for federal income tax (the supplemental rate), plus 7.65% for Social Security and Medicare, plus Idaho's flat 5.3% income tax: about 34.9% of a Idaho bonus withheld up front. Bonuses aren't actually taxed at a higher rate, though: at tax time they're ordinary income, and any over-withholding comes back in your refund. Here's how each piece works. Idaho is not alone: Wisconsin leave exactly the same $6,505.

  • Federal supplemental rate: Most employers withhold federal income tax from bonuses at a flat 22%, $2,200 on a $10,000 bonus, or 37% above $1 million a year, regardless of your regular bracket.
  • Idaho flat tax: Idaho taxes bonuses like all other wages at its flat 5.3% rate: there's no separate state bonus rate.
  • FICA taxes still apply: Social Security (6.2% up to the annual wage base) and Medicare (1.45%, plus 0.9% for high earners) come out of a bonus like any wage: $765 on $10,000.
  • Over-withholding is common: The flat 22% federal rate is often higher than your actual effective rate, and the difference comes back as a refund. In Idaho the whole $10,000 nets $6,505 once state tax and FICA are in.

Your actual bonus tax depends on your total annual income, not the bonus alone: these figures assume a $75,000 Idaho salary. Enter your own numbers above for an estimate that fits your situation.

Frequently Asked Questions

Typically about 34.9%: a flat 22% federal supplemental withholding, 5.3% Idaho income tax, and 7.65% FICA. Your actual tax owed depends on your full-year income and may be lower: the difference comes back as a refund when you file.

The IRS requires employers to withhold federal income tax from supplemental wages (including bonuses) at a flat 22% rate for amounts up to $1 million, rising to 37% above that. Your employer may alternatively add the bonus to your regular paycheck and withhold using the aggregate method. Worked through for Idaho: a $10,000 bonus keeps $6,505: 65.0% of it, after $530 of Idaho income tax.

It depends on your total annual income and tax bracket. If the 22% flat withholding rate is higher than your actual effective rate on the bonus, you'll get the difference back as a refund; if you're in a higher bracket, you may owe more. On a $75,000 salary in Idaho, a bonus is taxed at about 22% federally plus 5.3% to Idaho, so the 22% flat rate is close to the mark at that income.

Yes: as regular income. Idaho taxes all wage income, including bonuses, at its flat 5.3% rate; there is no separate state bonus rate.

Splitting a bonus across pay periods can reduce withholding if your employer uses the aggregate method, which annualizes your income, but it changes the timing, not the amount you ultimately owe. Where you live changes the amount: Idaho ranks 34 of 51 on what a $10,000 bonus leaves, against $6,565 in the median state and $6,017 in California.

Against the 6 states Idaho borders, the same a $10,000 bonus is worth $6,505 here: Nevada keeps $530 more ($7,035), Wyoming keeps $530 more ($7,035), Washington keeps $391 more ($6,896), Utah keeps $80 more ($6,585), Montana leaves $35 less ($6,470) and Oregon leaves $405 less ($6,100). Nevada, Utah, Washington and Wyoming are the only borders worth crossing for the tax alone. Idaho is not alone: Wisconsin leave exactly the same $6,505.

Idaho taxes every dollar above the standard deduction ($16,100 single, $32,200 married) at 5.3%, the highest rate of any flat-tax state. A $30,000 earner pays $737 (2.5% of salary) and a $150,000 earner pays $7,097 (4.7%), so effective rates still rise with income because of the deduction. Idaho's rate is higher than flat-tax states like Pennsylvania (3.07%) or North Carolina (3.99%).

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