Iowa 2024 Tax Brackets. The iowa department of revenue has finalized individual income tax brackets for the 2024 tax year (applicable for taxes due in 2025) and the 2024 interest rate, which the agency charges for overdue payments. For taxable years beginning 2024, the top tax rate is 5.70%;

For taxable years beginning 2025, the top tax rate is 4.82%; As a result, its top rate decreased from 6 percent to 5.7 percent.