How Much Are Bonuses Taxed in Iowa?
Iowa supplemental withholding rate: 3.80%, plus 22% federal and FICA.
Best net bonus (flat method)
$6,655
from $10,000 gross bonus
Flat method (22%)
Better$6,655
33.5% effective rate
Aggregate method
$6,655
33.5% effective rate
Difference: $0 more with the flat method.
Withholding estimates based on 2026 rates. Actual tax determined when you file.
Iowa bonus tax examples
| Bonus | Federal | State | FICA | Total tax | Net bonus |
|---|---|---|---|---|---|
| $5,000 | $1,100 | $190 | $383 | $1,673 | $3,328 |
| $10,000 | $2,200 | $380 | $765 | $3,345 | $6,655 |
| $25,000 | $5,500 | $950 | $1,913 | $8,363 | $16,638 |
| $50,000 | $11,000 | $1,900 | $3,825 | $16,725 | $33,275 |
Flat method, single filer, $75k base salary.
FAQ
What is the bonus tax rate in Iowa?
Iowa withholds 3.80% 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 Iowa?
Using the flat method with a $75,000 salary: net bonus of approximately $6,655 (33.5% 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 Iowa?
In Iowa, bonuses are taxed at a 3.80% 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 $6,655.
What is the Iowa bonus tax rate for 2026?
The Iowa supplemental withholding rate for 2026 is 3.80%. 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.