Tools · State Income Tax
Idaho Income Tax Calculator (2026)
Estimate your Idaho state income tax for 2026. Enter your taxable income and filing status to see what Idaho taxes and your effective state rate, broken out line by line.
Idaho state income tax calculator
- Taxable income entered
- $75,000
- Idaho standard deduction
- −$16,100
- Income taxed by Idaho
- $58,900
- Idaho income tax
- $3,122
Idaho taxes income at a flat 5.3%, down from 5.695% after HB 40 (2025) cut the rate. Idaho follows the federal standard deduction, so most filers subtract the same amount they use on their federal return.
State figures: Idaho State Tax Commission.
Estimate for 2026 state income tax only, based on annual tax brackets — it excludes federal income tax, Social Security and Medicare, local taxes, and any credits. This is general information, not tax advice.
How Idaho income tax is figured
Idaho applies a single flat rate to your taxable income (after any state deduction or exemption). Idaho taxes income at a flat 5.3%, down from 5.695% after HB 40 (2025) cut the rate. Idaho follows the federal standard deduction, so most filers subtract the same amount they use on their federal return.
This estimate covers state income tax only. It does not include federal income tax, Social Security and Medicare, or tax credits. It is an annual-bracket estimate, not your final return. This is general information, not tax advice.
Income tax calculators for other states
Same 2026 engine, each with its own state rules.