Idaho Income Tax Calculator 2026
Estimate your 2026 Idaho state and federal income tax. Includes Idaho tax brackets, a worked dollar example, and filing tips.
Key Tax Facts: Idaho
- Flat 5.8% rate as of 2023, down from graduated brackets
- Social Security benefits are fully taxable by Idaho
- Grocery credit offsets sales tax paid on food
- Military retirement pay is partially exempt
Idaho State Income Tax Overview
Idaho has a flat state income tax rate of 5.8% on all taxable income for 2025, following recent legislative changes that simplified the state's previous graduated bracket structure. Idaho generally conforms to federal definitions of income and deductions, making state tax preparation relatively straightforward for most residents. The state offers a grocery credit — a refundable credit that helps offset the sales tax paid on food — of $120 per person including dependents. Idaho also allows a deduction for retirement income for qualifying residents, and Social Security benefits are exempt from state income tax for most filers.
Idaho Income Tax Rate (2026) projected
Idaho uses a flat income tax rate -- the same percentage applies to all taxable income regardless of how much you earn.
Source: Idaho State Tax Commission
What a Idaho Resident Actually Pays: A Worked Example
| Taxable Income | $65,000.00 |
| Idaho Flat Rate | 5.8% |
| Estimated State Tax | $3770.00 |
| Effective Rate | 5.8% |
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Frequently Asked Questions -- Idaho Income Tax
Does Idaho have a state income tax?
Yes. Idaho imposes a state income tax with a flat rate of 5.8%. This is separate from your federal income tax obligation.
What is the Idaho income tax rate for 2026?
Idaho uses a flat income tax rate of 5.8% on all taxable income, regardless of income level or filing status.
Do I have to file a Idaho state tax return?
Most full-year Idaho residents with income above the state filing threshold must file a state return. Check the Idaho State Tax Commission for current thresholds and requirements.
How accurate is this Idaho state tax estimate?
This is a planning estimate. The state result uses Idaho's published brackets but does not account for all state deductions, credits, exemptions, or local taxes. Verify with official Idaho tax forms or a qualified tax professional.
Does this calculator include federal income tax?
Yes. The results show your estimated Idaho state income tax and your federal income tax using 2026 federal brackets (projected until the IRS publishes official 2026 figures) -- your full combined picture in one place.
Where can I find official Idaho tax forms?
Official forms, instructions, and filing guidance are available at the Idaho State Tax Commission.
What is the sales tax rate in Idaho?
Idaho's combined state and average local sales tax rate is 6.02%. This is separate from income tax and applies to most retail purchases -- use our sales tax calculator to check a specific purchase.
When are Idaho 2026 state taxes due?
2026 taxes are generally filed in 2027. The Idaho filing deadline is April 15, 2027, the same as the federal deadline.
Understanding Your Idaho Tax Estimate
Your results combine two separate bills: federal tax owed to the IRS, and Idaho state tax owed to the Idaho State Tax Commission. The state return is filed separately from your federal Form 1040, with a state filing deadline of April 15. For the mechanics of how bracket math actually works -- why your effective rate is almost always lower than your top bracket -- see our marginal vs. effective tax rate guide.
Lowering Your Idaho Bill
Pre-tax retirement contributions reduce your federal and Idaho taxable income in the same move -- see our 401(k) contribution limits and HSA limits guides for the current caps. Beyond that, Idaho-specific credits and deductions that don't exist at the federal level are listed at the Idaho State Tax Commission -- worth checking, since these are easy to miss if you only look at federal guidance.
Combined Sales + Income Tax Picture
Idaho's combined state-plus-average-local sales tax rate is 6.02%. If you're self-employed, that's an added layer on top of income tax -- our self-employment tax calculator covers the SE-specific piece separately.
Disclaimer: Estimates for educational purposes only. State tax results are approximations based on published bracket data and do not account for all deductions, credits, exemptions, local taxes, or individual situations. Not tax, legal, or financial advice. Consult the Idaho State Tax Commission or a qualified tax professional for guidance specific to your situation.