Idaho Income Tax Calculator 2026
Estimate your Idaho (ID) income tax for 2026. Idaho has a 5.8% flat state income tax. Enter your income below and click “Calculate Taxes” for an instant breakdown.
Tax Information
Enter your income to estimate your tax liability
Idaho Income Tax Overview
Idaho has a flat income tax rate of 5.8%. This means all taxable income is taxed at the same rate regardless of how much you earn.
The standard deduction in Idaho is $14,600 for single filers and $29,200 for married filing jointly.
Frequently Asked Questions
- What is the Idaho income tax rate?
- Idaho has a flat income tax rate of 5.8%. All taxable income is taxed at this same rate regardless of income level.
- Does Idaho have a standard deduction?
- Yes. The Idaho standard deduction is $14,600 for single filers and $29,200 for married filing jointly.
- How is Idaho income tax calculated?
- Idaho uses a flat tax system. After subtracting your standard deduction (if applicable), your remaining taxable income is taxed at a flat rate of 5.8%, then added to your federal tax and FICA obligations.
- How do I calculate my total Idaho tax bill?
- Your total tax includes federal income tax (10%–37%), Social Security (6.2% on the first $176,100), Medicare (1.45%), and Idaho state income tax. Use our free calculator above for an instant breakdown.
Related Calculators & Resources
Idaho Paycheck Calculator
Calculate your Idaho take-home pay
Federal Tax Calculator
Estimate your federal income tax liability
All 50 State Tax Rates
Compare income tax rates across every state
Idaho Tax Brackets
See 2025 federal and Idaho brackets
Idaho Take-Home Pay
Detailed net pay breakdown for Idaho
Idaho Total Tax Burden
Combined federal, state, and local taxes