Free Idaho Tax Calculator

Idaho charges a flat 5.3% income tax for 2026 — and that single number is exactly what makes Idaho unusual: it uses your federal taxable income as the starting point, with a small 0% band on the first ~$4,800 of taxable income before the 5.3% rate kicks in.

On a $75,000 salary, your federal taxable income is $58,900 after the standard deduction. Idaho taxes the first $4,811 at 0% and the remaining $54,089 at 5.3% — about $2,866. Federal tax and FICA stack on top, leaving roughly $50,000 of take-home.

Idaho gives significant retirement breaks: Social Security is fully exempt, and there's a $60,000-per-person deduction for qualifying retirement income (45+ with earned income requirements). That makes Idaho surprisingly competitive for retirees despite the 5.3% working-years rate. Grocery shoppers get an odd perk — Idaho refunds $120 per person annually ($240 for seniors) to offset grocery sales tax.

Boise adds no city income tax. Property tax averages 0.96% of home value — near the national average — while combined sales tax sits at 8.05%, mostly from the state's 6% base rate plus municipal add-ons. Idaho's overall burden is close to the national median.

Filing in Idaho: the resident return is Form 40, filed with the Idaho State Tax Commission by April 15. Idaho supports free e-file, and the grocery credit is claimed on the same form — no local returns exist.