Results are estimates for educational purposes only. Based on 2026 IRS federal brackets and Idaho state tax rates. Always consult a qualified tax professional.
Idaho income tax overview
Idaho moved to a flat income tax rate of 5.695% in 2025, simplifying what was previously a progressive bracket system. Idaho has one of the fastest-growing populations in the country, driven significantly by relocations from California and Washington seeking lower costs and a flat, moderate tax structure. The state does not tax Social Security benefits, and offers a retirement benefits deduction for qualifying pension income. Idaho conforms closely to federal tax rules for most deductions, which simplifies filing. Boise's growing tech sector and the broader Treasure Valley region have seen substantial economic growth, partly attributed to the state's favorable tax and regulatory environment compared to neighboring states.
2026 Idaho income tax rates
Tax rate
Income range (single filer)
5.695% flat
All taxable income (2026)
Worked example: $75,000 salary in Idaho
A $75,000 salary in Idaho results in approximately $4,271 in state income tax (5.695% flat after standard deduction), plus $12,580 federal tax, $4,650 Social Security, and $1,088 Medicare. Annual take-home is approximately $52,411, or $2,016 bi-weekly.
Key facts: 5.695% flat rate (since 2025) · Social Security exempt · No local income tax
Frequently asked questions — Idaho income tax
Idaho transitioned to a flat income tax rate of 5.695% effective the 2025 tax year, simplifying its previous multi-bracket progressive system into a single rate.
No. Idaho does not tax Social Security benefits. The state also offers a retirement benefits deduction for other qualifying pension income for residents aged 65 and older.
Idaho has seen significant population growth from California and Washington residents seeking lower costs of living, a flat moderate tax rate, and access to outdoor recreation, particularly in the Boise metro area.
No. Idaho cities and counties do not levy local income taxes.
Yes, largely. Idaho generally follows federal definitions of taxable income and the federal standard deduction structure, which simplifies state filing for most residents.
Compare Idaho to other states
Use our US income tax calculator to compare your take-home pay across all 50 states. You may be surprised how much location affects your net income.