State Income Tax
Idaho imposes a state income tax using a flat rate of 5.695% on all taxable income regardless of income level. The filing deadline is 2026-04-15. Social Security benefits are exempt from Idaho state income tax. Retirement income is generally taxable. Social Security is exempt. Some retirement benefits for seniors/disabled are deductible.
Retirement Income Details
Social Security is exempt. Some retirement benefits for seniors/disabled are deductible.
Does Idaho have a state income tax?
Yes. Idaho has a state income tax with a flat rate of 5.695%.
What is the Idaho income tax rate?
Idaho uses a flat tax rate of 5.695% on all taxable income. This means all taxpayers pay the same rate regardless of how much they earn.
Is Social Security taxed in Idaho?
No. Idaho does not tax Social Security benefits, which can be significant for retirees living on fixed incomes.
Is retirement income taxed in Idaho?
Yes. Idaho generally taxes retirement income. Social Security is exempt. Some retirement benefits for seniors/disabled are deductible.
When is the Idaho income tax filing deadline?
The Idaho state income tax filing deadline is 2026-04-15. You can file and pay through the official Idaho Department of Revenue portal.
What is the standard deduction in Idaho?
Idaho's standard deduction is $14,600 for single filers and $29,200 for married filing jointly.
How does Idaho income tax compare to neighboring states?
Idaho's top rate of 5.695% is in the moderate range nationally. Use the comparison table above to see how neighboring states compare.
Official Payment Portal
Idaho Department of Revenue
Last verified: 2026-03-31 · Always consult a tax professional before making financial decisions.