How Much Are Bonuses Taxed in Montana?
Montana supplemental withholding rate: 5.90%, plus 22% federal and FICA.
Best net bonus (aggregate method)
$6,470
from $10,000 gross bonus
Flat method (22%)
$6,445
35.5% effective rate
Aggregate method
Better$6,470
35.3% effective rate
Difference: $25 more with the aggregate method.
Withholding estimates based on 2026 rates. Actual tax determined when you file.
Montana bonus tax examples
| Bonus | Federal | State | FICA | Total tax | Net bonus |
|---|---|---|---|---|---|
| $5,000 | $1,100 | $295 | $383 | $1,778 | $3,223 |
| $10,000 | $2,200 | $590 | $765 | $3,555 | $6,445 |
| $25,000 | $5,500 | $1,475 | $1,913 | $8,888 | $16,113 |
| $50,000 | $11,000 | $2,950 | $3,825 | $17,775 | $32,225 |
Flat method, single filer, $75k base salary.
FAQ
What is the bonus tax rate in Montana?
Montana withholds 5.90% on supplemental income like bonuses, in addition to the 22% federal withholding and FICA taxes.
How much will I take home from a $10,000 bonus in Montana?
Using the flat method with a $75,000 salary: net bonus of approximately $6,445 (35.5% total withholding rate).
Which withholding method should I choose?
It depends on your salary and bonus. The flat method withholds 22% federal; the aggregate method uses your actual brackets. Use the calculator above to compare both.
Is this my final tax on the bonus?
No. This is withholding — your actual tax is determined when you file your return. If too much was withheld, you get a refund.
How much are bonuses taxed in Montana?
In Montana, bonuses are taxed at a 5.90% state supplemental rate plus 22% federal flat rate. You'll also owe 6.2% Social Security (up to the $184,500 wage cap) and 1.45% Medicare. On a $10,000 bonus, you'd take home approximately $6,445.
What is the Montana bonus tax rate for 2026?
The Montana supplemental withholding rate for 2026 is 5.90%. This is the state portion — your employer also withholds 22% federal tax, 6.2% Social Security, and 1.45% Medicare from bonus payments.
Other states
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Withholding estimates only. Consult a tax professional for advice.