Income Tax for Idaho (2026)

How This Calculator Works in Idaho

This calculator applies Idaho's 2026 tax brackets and rates to estimate your state income tax liability. Enter your income and filing status to see your marginal rate, effective rate, and estimated tax owed.

Idaho Overview

Idaho adopted a flat income tax of 5.8% in 2023, replacing its former progressive system. The state does not tax Social Security benefits and provides a grocery tax credit to offset its unusual practice of taxing food purchases. Idaho's shift to a flat rate aligns with a national trend and was partly driven by competition with neighboring no-income-tax states Washington and Wyoming.

How Idaho Compares

Idaho's top income tax rate of 5.8% compares to Washington at 0% and Oregon at 9.9%. The rate differences can meaningfully impact take-home pay for workers near state borders.

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 adopted a flat income tax rate of 5.8% in 2023, replacing a progressive system with rates up to 6%.
• 2The switch to a flat rate simplified filing and lowered the top rate, though it increased the rate on lower-income filers compared to the old bottom brackets.
• 3Idaho does not tax Social Security benefits and offers a grocery tax credit to offset the 6% sales tax applied to groceries.
• 4The state generally conforms to federal tax law, so most federal deductions and adjustments carry through to your Idaho return.
• 5Idaho has no reciprocity agreements with neighboring states, so cross-border workers (especially those commuting to Washington) must file in both states.

Frequently Asked Questions