Idaho State Income Tax Calculator
Calculate your Idaho state income tax liability for 2026
About Idaho State Income Tax
Tax Brackets & Rates (2026)
| Income Range | Tax Rate |
|---|---|
| Over $0 | 5.8% |
Deductions & Exemptions
- Standard Deduction: $13,850
How Idaho State Income Tax Works
Idaho uses a flat tax rate of 5.8% on all taxable income. This means all income above deductions and exemptions is taxed at the same rate.
Tips for Idaho Taxpayers
- File your state return by the same deadline as federal taxes (typically April 15)
- Consider itemizing deductions if they exceed the standard deduction
- Make estimated quarterly payments if you're self-employed or have significant investment income
- Keep detailed records of all income, deductions, and tax payments
- Consider contributions to tax-advantaged accounts like 401(k)s and IRAs to reduce taxable income