Estimate your Idaho state income tax plus combined federal and ID state tax for 2026. 5.8% top rate.
Idaho has progressive income tax with a top rate of 5.8%. Idaho recently simplified its tax structure and reduced rates. Idaho does not tax Social Security benefits for lower-income residents and offers a grocery credit to offset sales tax on food. Use the calculator above to estimate your combined federal and Idaho state income tax for 2026. State tax figures use a simplified rate — for precise Idaho state tax calculations, consult the Idaho Department of Revenue or a licensed tax professional.
Idaho uses a 5.8% top rate state income tax structure. Like most states, Idaho starts its calculation from your federal Adjusted Gross Income (AGI), then applies state-specific adjustments — subtracting income Idaho excludes from taxation (such as certain pension or Social Security income) and adding back any income Idaho taxes that the federal government does not. After adjustments, the Idaho standard deduction is applied, then the 5.8% top rate is applied to arrive at state taxable income.
Idaho income tax is collected through employer paycheck withholding for W-2 employees and through quarterly estimated payments for self-employed residents and those with significant non-wage income. The Idaho state return is generally due April 15, aligned with federal returns. Part-year residents and nonresidents who earn income sourced in Idaho must also file a Idaho return for that income portion.
Your Idaho state income taxes are deductible on your federal Schedule A as part of the SALT (State and Local Tax) deduction, capped at $40,400 in 2026 under OBBBA. At the 22% federal bracket, paying $1,896 in Idaho state income tax generates approximately $417 in federal tax savings, reducing the true net cost of your Idaho taxes to about $1,479 for itemizing taxpayers.
Jordan is a single filer earning $75,000 in Idaho. This shows how federal and Idaho state income tax are calculated together.
Moving to a no-income-tax state (Texas, Florida, Nevada, or Wyoming) would save Jordan approximately $1,896/year ($158/month) in state income taxes. However, no-income-tax states often fund services through higher property taxes, sales taxes, or other fees, so a complete comparison requires evaluating all taxes together, not just income tax.
Idaho Tax Rate and Annual Filing
Idaho residents earning above the state filing threshold must file a Idaho income tax return annually, typically due April 15. The 5.8% top rate applies after Idaho-specific deductions and any state tax credits. Employers withhold Idaho state income tax from employee paychecks throughout the year using Idaho withholding tables, and any balance owed or refund due is settled when the annual state return is filed. Self-employed Idaho residents make quarterly estimated payments to the state in addition to their federal quarterly estimated tax payments.
Federal SALT Deduction Reduces Net State Tax Cost
State income taxes paid in Idaho reduce your federal taxable income through the SALT deduction (capped at $40,400 in 2026 under OBBBA). For a Idaho resident in the 22% federal bracket paying $1,896 in state income tax, the SALT deduction recovers approximately $417 in federal taxes, so the true after-federal-benefit cost of Idaho state income tax is about $1,479. This offset only benefits taxpayers who itemize deductions on federal Schedule A rather than taking the standard deduction.
Total Tax Burden: State Income Tax Is One Piece
State income tax is one component of your total tax burden in Idaho. Property taxes, local income taxes (in some Idaho cities and counties), and state and local sales taxes also contribute to your overall cost of living. When comparing Idaho to other states, evaluate all tax types together rather than income tax in isolation. Use the calculator above to see your combined federal and Idaho state effective rate at your specific income level.
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Idaho has a 5.8% top rate state income tax for 2026. Idaho has progressive income tax with a top rate of 5.8%. Idaho recently simplified its tax structure and reduced rates. Idaho does not tax Social Security benefits for lower-income residents and offers a grocery credit to offset sales tax on food. The state income tax is calculated separately from federal income tax and is paid through payroll withholding or quarterly estimated payments.
Idaho has its own state standard deduction separate from the federal standard deduction ($15,750 single, $31,500 MFJ in 2026). For precise Idaho state deduction amounts, consult the Idaho Department of Revenue or a state tax professional.
Idaho's 5.8% top rate state income tax can be compared to other states using our state tax calculator above. The U.S. average top marginal state income tax rate is approximately 5-6%. Nine states have no income tax at all (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming), while California has the highest at 13.3%.
Idaho offers state tax credits and deductions that may reduce your state tax liability. Common state credits include earned income credits, child tax credits, and credits for the elderly. Consult the Idaho Department of Revenue website or a licensed tax professional for credits specific to your situation and income level.
Use the calculator above. Enter your income and ID is pre-selected as your state. The calculator computes your 2026 federal income tax using the One Big Beautiful Bill Act brackets (10%-37%), adds your estimated Idaho state income tax (5.8% top rate simplified), and displays your total tax burden, combined effective rate, and annual take-home pay. All calculations happen instantly in your browser.