Idaho Income Tax Calculator

What Idaho’s Tax Structure Actually Means for Your Paycheck

The story of Idaho’s income tax is really the story of Boise’s boom. When the Treasure Valley started absorbing an extraordinary wave of in-migration from California, Oregon, and Washington after 2018 — tech workers, remote employees, retirees, families priced out of coastal metros — the state legislature made a calculated decision that Idaho’s tax code should be part of the reason people stayed rather than just passing through. The 2022 flat-tax bill was explicitly tied to that competitive positioning. Governor Brad Little signed it along with a property tax relief package in the same session. The combination was deliberate: a flat income tax rate that everyone could understand and plan around, and lower property taxes that rewarded homeownership at a time when Idaho home values were rising faster than almost anywhere in the country. The Boise metro’s population growth rate in the years surrounding that reform was among the top ten in the nation. That is not coincidence.

For day-to-day workers, Idaho’s flat 5.3% means something genuinely useful: there is no bracket to accidentally cross, no marginal rate cliff where a raise suddenly costs more than it looks. Every dollar of Idaho taxable income — the thousandth dollar or the hundred-thousandth — faces the same 5.3%. Idaho follows the federal standard deduction, so for 2025 a single filer removes $15,750 from their income before the rate even applies. A $75,000 single earner with no other deductions has Idaho taxable income of $59,250 and an Idaho state tax bill of $3,140 — an effective state rate of 4.19%, not the 5.3% headline rate, because the standard deduction does its work first. New for 2025 and particularly notable: Idaho now conforms to the federal treatment of tip income and overtime compensation, allowing workers who earn either to deduct those amounts from Idaho taxable income. The state also removed precious metal bullion sales from taxable income this year — a specific provision that reflects Idaho’s historically close relationship with the agricultural and resource economy. Idaho is a community property state, meaning income earned during marriage is generally owned and taxed equally between spouses, which can create unique planning considerations for married filers — particularly in cases of disparate incomes between spouses.

Retirement planning in Idaho requires nuance. Unlike Nebraska (which fully exempts Social Security in 2025) or New Mexico (which exempts military retirement entirely with no cap), Idaho’s approach is more layered. Social Security benefits that are taxable federally are also included in Idaho taxable income — there is no separate state Social Security exemption. What Idaho does offer is the Retirement Benefits Deduction: up to $48,216 for single filers and $72,324 for married couples filing jointly. This deduction applies to PERSI benefits, to pensions received under the Civil Service Retirement System (specifically CSRS — not the newer FERS), and to military retirement pay if the retiree is at least 62, classified as disabled, or is still working sufficiently to be required to file a federal return. The maximum deduction amounts were recalculated for 2025. Outside of that deduction, private 401(k) and IRA distributions are fully taxable at the 5.3% flat rate — the same rate that applies to wages. No Idaho city or county levies a local income tax: Boise, Nampa, Meridian, Idaho Falls, Caldwell, Coeur d’Alene, Pocatello, and Twin Falls are all free of local income tax on wages.