What is the Idaho state income tax rate?

After the 2022-2024 reforms Idaho uses a single flat rate of 5.8% on taxable income. The state replaced its old graduated brackets with one rate, which makes Idaho tax simple to estimate.

Is income below the standard deduction taxed in Idaho?

No. Idaho effectively exempts income at or below the standard deduction (about $14,600 single, $29,200 joint for 2024). Only income above that deductible amount is taxed at the flat 5.8% rate, so the effective rate stays below 5.8%.

Did Idaho really cut its income tax?

Yes. Through a series of 2022 and 2023 laws Idaho collapsed its multiple brackets into a single flat rate and lowered it to 5.8%. Earlier years used graduated rates up to roughly 6.5%, so the change reduced taxes for most filers.

Does Idaho have local income taxes?

No. Idaho cities and counties do not levy a separate local income tax on wages, so the flat 5.8% state rate is the only Idaho income tax you owe. Sales and property taxes are separate.

Is my income data sent anywhere?

No. The calculation runs in your browser. Nothing you enter is uploaded, logged, or stored.

Idaho State Income Tax Calculator

After a wave of 2022-2024 tax reform, Idaho replaced its old graduated brackets with a single flat 5.8% rate. Income at or below the standard deduction is effectively exempt, so the rate is simple to estimate. This free calculator does the math.

How it works

Idaho’s simplified income tax formula is:

Start from your Idaho income (federal AGI is a close approximation for most wage earners).
Subtract the standard deduction — about $14,600 single or $29,200 married filing jointly for 2024. Income at or below this amount is exempt.
Apply the flat 5.8% rate to the remaining taxable income.

Because the deductible amount is exempt, your effective rate is always below the 5.8% statutory rate.

Example

A single filer with $70,000 income subtracts the $14,600 standard deduction, leaving $55,400 taxable. Idaho tax is 5.8% × $55,400 = $3,213 — an effective rate near 4.6%, well under the 5.8% flat rate.

Notes

This estimate covers Idaho state income tax only — not federal tax, FICA, the grocery credit, or other Idaho credits. Itemizers and large families may have a different deduction. The standard deduction tracks the federal figure and is indexed annually, so use the amount for your filing year.