Idaho Income Tax Calculator 2026
Estimate your 2026 federal and state income tax liability in Idaho (ID). Idaho has a 5.8% flat state income tax. Enter your income, filing status, and deductions to see your total tax and effective rate.
Tax Information
Enter your income to estimate your tax liability
Idaho Income Tax Overview
Idaho has a flat income tax rate of 5.8%. Every dollar of taxable income is taxed at the same rate, which makes calculating your state taxes straightforward. Combined with the progressive federal bracket system, your total effective rate depends on your income level.
The standard deduction in Idaho is $14,600 for single filers and $29,200 for married filing jointly. This reduces your taxable income before the flat rate is applied.
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