Idaho Income Tax Calculator
Estimate your 2026 Idaho state income tax in seconds. Enter your annual income and filing status — this free Idaho income tax calculator applies the verified 2026 Idaho brackets, standard deduction, exemptions and credits. Runs entirely in your browser.
In 2026, Idaho applies a 5.3% rate, rising to 5.3% on income over $4,811. Idaho offers a $16,100 standard deduction for single filers ($32,200 joint). Idaho's 5.3% flat rate applies above a zero-rate floor ($4,811 single / $9,622 joint per the Tax Foundation 2026 table).
Idaho 2026 Income Tax Brackets
| Taxable income (Single) | Rate |
|---|---|
| Over $4,811 | 5.3% |
Married filing jointly
| Taxable income (Joint) | Rate |
|---|---|
| Over $9,622 | 5.3% |
Marginal rates: only income inside each band is taxed at that band's rate.
Frequently Asked Questions
What is the Idaho income tax rate for 2026?
Idaho applies a 5.3% rate, rising to 5.3% on income over $4,811.
What deductions and exemptions does Idaho offer?
Idaho offers a $16,100 standard deduction for single filers ($32,200 joint).
How accurate is this Idaho income tax estimate?
It is an annualized estimate: your income minus the 2026 standard deduction (and any state exemptions/credits shown), run through 2026 marginal brackets. It does not include pre-tax deductions like 401(k) contributions, itemized deductions, phaseouts, or local income taxes. Your actual liability can differ.
Sources
Tax figures verified September 2026 for tax year 2026.
Estimate only — not tax advice. This calculator annualizes your income, subtracts the 2026 standard deduction (and state personal exemptions/credits where shown), and applies 2026 marginal brackets. It does not model pre-tax deductions (401(k), health insurance), itemized deductions, credits you may qualify for, phaseouts, or local/city/county income taxes. Consult a tax professional for your situation.