Key Tax Facts: Idaho
- Flat 5.3% rate for tax year 2025, reduced from 5.695% in 2024
- 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 5.3% for tax year 2025, reduced from 5.695% in 2024, which itself came down from 5.8%. Idaho moved to a flat tax in 2023, replacing a graduated system. The state conforms to the federal standard deduction, $15,000 for single filers and $30,000 for married couples filing jointly for 2025. Idaho does not tax Social Security benefits, and it offers a deduction for certain retirement income for filers 65 and older, or 62 and older if disabled. Idaho also allows a grocery tax credit to offset sales tax paid on food, which residents claim on their state return.
Idaho Income Tax Rate (2025)
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 | 5.3% |
| Estimated State Tax | $3445.00 |
| Effective Rate | 5.3% |
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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 5.3%. This is separate from your federal income tax obligation.
What is the Idaho income tax rate for 2025?
Idaho uses a flat income tax rate of 5.3% 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 estimate?
This is a planning estimate of your federal income tax only. It does not calculate Idaho state tax, and it does not account for state deductions, credits, exemptions, or local taxes. Use the Idaho rate schedule above as a reference, and verify with official Idaho tax forms or a qualified tax professional.
Does this calculator include federal income tax?
Yes. The calculator estimates your 2025 federal income tax using the official IRS 2025 brackets. It does not compute your Idaho state tax -- see the Idaho rate schedule below to work that out.
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 2025 state taxes due?
2025 taxes are generally filed in 2026. The Idaho filing deadline is April 15, 2026, 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.