Iowa Income
Tax Rates & Rules
Iowa has a flat state income tax rate of 3.8%, applied to all taxable income regardless of income level.
Iowa Flat Income Tax Rate
Iowa tax year rates, most recently confirmed by the state Department of Revenue.
All Filing Statuses
| Taxable Income | Rate |
|---|---|
| All taxable income | 3.8% |
Iowa applies a single flat rate to all taxable income, regardless of income level or filing status.
Sources: Iowa DOR — Individual Income Tax. Last verified: August 14, 2026.
How Iowa Income Tax Works
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Frequently Asked Questions
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