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 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.