Iowa Tax Calculator
Iowa now applies a single flat rate to all taxable income, the endpoint of a multi-year phase-down from a nine-bracket progressive system that completed in 2025. Iowa does not tax Social Security benefits and offers a retirement-income exclusion for qualifying taxpayers. This calculator applies the current flat rate to your entered income for an instant result.
State Tax
$3,800Effective Rate
3.80%Marginal Rate
3.80%| Rate | Bracket Range | Tax |
|---|---|---|
| 3.80% | $0+ | $3,800 |
| Total | $3,800 | |
How Iowa income tax works
- Iowa multiplies your taxable income by one flat rate — the former multi-bracket system was fully retired in 2025.
- A retirement-income exclusion is available for qualifying taxpayers on top of the standard calculation.
- The calculator applies the current flat rate directly to your entered income.
Need the exact bracket thresholds instead of an estimate? See the Iowa tax brackets for 2026 .
Estimate your Iowa property tax by county, compare every state at the state tax brackets hub , or see the full tax-by-state directory .
Frequently asked questions
How is Iowa income tax calculated?
Iowa applies a single flat rate to your taxable income, following the completion of a multi-year move away from tiered brackets. The calculator multiplies your entered income by that rate.
Does Iowa tax Social Security benefits?
No. Iowa excludes Social Security benefits from state taxable income and offers an additional retirement-income exclusion for qualifying taxpayers.
When did Iowa switch to a flat tax?
Iowa completed a multi-year phase-down from nine progressive brackets to a single flat rate effective 2025.
How much state tax will I pay in Iowa?
Since Iowa uses a flat rate, your state tax is that rate applied to your taxable income, after any retirement exclusion. Enter your figures above for an instant total.
Sources
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