Tax Bracket Calculator for Idaho (ID) — Free Calculator

Idaho Tax Brackets (2026)

Idaho uses a graduated income tax system with a top marginal rate of 5.8%.

Idaho Bracket Structure

5.695% on income up to $90,600 (joint) / $45,300 (single); 6.925% on income above those thresholds — wait, Idaho simplified to a flat-like 5.8% in 2023 on income over $2,500 (single)/$5,000 (joint)

Idaho reduced and simplified its income tax in 2022–2023 to a near-flat structure. The top rate of 5.8% applies to income above very low thresholds, making Idaho effectively a flat-rate state for most filers. A flat 5.695% was enacted for 2024.

Federal Tax Brackets Still Apply to Idaho Residents

Regardless of Idaho's state tax rules, all residents pay federal income tax. Federal brackets for 2024 range from 10% (on income up to $11,600 for single filers) to 37% (on income over $609,350). Your effective federal rate is typically well below the top marginal rate due to the graduated bracket structure.

Effective vs. Marginal Rate in Idaho

Your marginal rate is the rate on your last dollar of income. Your effective rate is your total tax divided by total income. For Idaho residents the marginal rate can reach 5.8% but most filers pay a lower effective rate. The median household income in Idaho is $60,999.

Data: Tax Foundation (2024), IRS Statistics of Income, US Census Bureau ACS 2023. Updated 2024–2025. Figures reflect state averages — consult a licensed CPA for personalized tax advice.

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Frequently Asked Questions

What tax brackets apply to Idaho residents?

Idaho has a graduated income tax system. 5.695% on income up to $90,600 (joint) / $45,300 (single); 6.925% on income above those thresholds — wait, Idaho simplified to a flat-like 5.8% in 2023 on income over $2,500 (single)/$5,000 (joint). Federal brackets also apply on top of the state tax.

What is the difference between marginal and effective tax rate in Idaho?

Your marginal rate is the rate on your highest dollar of income. Your effective rate is your total tax burden divided by total income. In Idaho, even if the top marginal rate is 5.8%, most residents pay a lower effective rate because lower income portions are taxed at lower brackets.

Does Idaho have different tax brackets for married filers?

Yes, Idaho typically has different bracket thresholds for single vs. married filing jointly filers. Married joint filers often have brackets approximately twice as wide, reducing the marriage penalty. Check the Idaho Department of Revenue for current bracket tables.

How does this tax bracket calculator work for Idaho?

Enter your income and filing status. The calculator applies both federal and Idaho state tax brackets to show your marginal rate, effective rate, and total estimated tax. Idaho's graduated rate of up to 5.8% is applied to your state taxable income.