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Idaho Income Tax Calculator

Estimate your 2026 combined federal and Idaho income tax — Idaho adds progressive state income tax on top of federal.

InputsTY-2026
$
$
$
Federal + state tax17.4% effective
$17,388/yr
10% on $12,400$1,240
12% on $38,000$4,560
22% on $33,500$7,370
federal tax subtotal$13,170
ID state tax$4,218
taxable income
$83,900
marginal rate
22.0%
after tax
$82,612

A single filer earning Idaho's median household income of $81,650 owes about $3,245 in Idaho state income tax — an effective state rate of 3.97%. That is state tax only, on top of federal income tax and FICA.

Based on 2025 Idaho rules and 2026 federal rules, with the standard deduction and no other adjustments. Median income is the 2024 Census figure.

Income tax in Idaho

Idaho cut its income tax rate from 5.695% to 5.3% for tax year 2025 via House Bill 40, made retroactive to January 1, 2025 — the largest income tax cut in state history. The tax is effectively flat: 5.3% applies to taxable income above a small zero-rate band ($4,673 single / $9,346 married filing jointly), after a standard deduction that mirrors the federal amounts.

Idaho income tax structure (2025)

Idaho uses 2 progressive brackets on income above a $15,750 standard deduction (single). Single-filer brackets:

$0 – $4,6730%
over $4,6745.30%

Married-filing-jointly thresholds differ (roughly double in most states). Each slice of income is taxed at its own rate — landing in a bracket does not tax your whole income at that rate.

Common questions

What are Idaho's income tax brackets?
Idaho does not really use brackets for 2025: the first $4,673 of taxable income is untaxed, and everything above it is taxed at 5.3%. Taxable income here is your pay after a $15,750 standard deduction ($31,500 joint). Joint filers get their own, wider thresholds.
What is the top income tax rate in Idaho?
5.3%, and it begins at $4,673 of taxable income for a single filer — about $20,423 of gross pay, once the $15,750 Idaho subtracts first is added back. Only income above that point is taxed at that rate; everything below it is exempt.
What is the tax bill on $81,650 in Idaho?
A single filer on Idaho's $81,650 median household income (2024 Census figure) owes roughly $3,245 to Idaho — an effective state rate of 4.0% against a 5.3% marginal bracket — plus about $9,133 of federal income tax.
Does Idaho have a standard deduction?
Yes — $15,750 for a single filer and $31,500 on a joint return, subtracted before Idaho's 5.3% schedule is applied. A single filer earning less than $15,750 therefore owes no Idaho income tax at all, and at the state's $81,650 median income it saves about $835 of tax.

How we calculate this

Federal brackets per our income-tax methodology, plus Idaho's 2025 state tax (2026 state tables pending). Estimates only — not tax advice.

Tax Foundation: 2025 state income tax rates →Idaho State Tax Commission →

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Estimates for general informational purposes only; not tax advice. Idaho figures are simplified (credits, local taxes, and AGI adjustments vary) and should be verified with the state Department of Revenue. Idaho's single-rate 5.3% schedule is applied with the $15,750 standard deduction for a single filer — not itemized deductions or any Idaho tax credit. It also excludes any local, county, or school-district tax your municipality may add.