Idaho Income Tax Rate 2025
Idaho has a flat income tax rate of 5.8% on all taxable income. The state moved to a flat tax structure in 2023, simplifying its previous progressive bracket system.
Tax Type
Flat Rate
Income Tax Rate
5.8%
Tax Brackets
1 (flat)
How It Works
Idaho's flat tax rate means all taxable income is taxed at the same 5.8% rate regardless of income level. Idaho conforms closely to the federal tax code for determining taxable income, with some modifications. The state does not tax Social Security benefits.