Tax Bracket for Idaho (2026)
Last updated: January 15, 2026
Idaho (ID) Key Facts
Tax Structure
Flat rate
Top Marginal Rate
5.8%
Number of Brackets
1
Tax Year
2,026
How This Calculator Works in Idaho
This calculator shows which Idaho tax bracket your income falls into. Enter your income and filing status to see marginal and effective rates.
Idaho Overview
Idaho levies a flat income tax rate of 5.8% on all taxable income. Unlike progressive states with multiple brackets, every dollar earned in Idaho is taxed at the same rate, making calculations predictable and straightforward.
How Idaho Compares
Idaho's top rate of 5.8% compares to Washington at 0% and Oregon at 9.9%. Comparing effective rates is more meaningful than top rates alone.
| State | Top Rate | Notes |
|---|---|---|
| Washington | 0% | Washington has an income tax rate of 0%. |
| Oregon | 9.9% | Oregon has an income tax rate of 9.9%. |
| Montana | 6.75% | Montana has an income tax rate of 6.75%. |
Idaho's income tax rate of 5.8% compares to a national average of approximately 5.04%. This is above the national average.
Tips for Idaho Residents
- 1Idaho uses a flat income tax rate of 5.8%, meaning all taxable income is taxed at the same rate regardless of how much you earn.
- 2With a flat tax, your marginal rate and effective state rate are the same—5.8%.
- 3Federal brackets still apply progressively on top of Idaho's flat 5.8% rate.
- 4Pre-tax retirement contributions reduce both your federal bracket and the income subject to Idaho's flat 5.8%.
- 5Idaho's flat 5.8% is near the national average of about 5%, making withholding calculations straightforward.