How to Use This Calculator
Enter your income, filing status, and any deductions. The calculator computes your Idaho state income tax alongside your federal tax, showing exactly how much goes to each and what you take home.
The most useful thing to try? See how Idaho's flat 5.695% rate affects different income levels, then test how deductions and retirement contributions change your bottom line.
Here's what each field means:
Annual Income is your total earnings before any taxes. Include wages, freelance income, investment income, and any other sources.
Filing Status determines which deductions and exemptions apply. Idaho uses filing statuses similar to the federal system.
Idaho Income Tax: What You Need to Know
Idaho uses a flat income tax of 5.695% on all taxable income. Unlike states with progressive brackets, everyone pays the same percentage regardless of how much they earn. A teacher making $45,000 and a CEO making $500,000 both pay 5.695%.
Idaho switched from a graduated system to a flat 5.8% rate in 2023, which was further reduced to 5.695% for 2025. The state conforms closely to federal tax definitions, using the federal standard deduction as its starting point. This makes filing relatively straightforward. Idaho previously had rates ranging from 1% to 6.5%. The flat tax simplification was part of a broader tax reform package that also included a one-time rebate to taxpayers.
A Real Example
Let's say you're a single filer earning $65,000 in Idaho. After applying the standard deduction of $14,600, your approximate Idaho state income tax would be around $2,872, for an effective state tax rate of about 4.4%.
That's just the state portion. Federal income tax and FICA taxes are additional.
Deductions and Exemptions
Standard Deduction: $14,600 for single filers and $29,200 for married couples filing jointly.
Idaho starts with federal taxable income and conforms to the federal standard deduction. Additional state deductions are available for certain retirement benefits (up to $40,978 for qualifying taxpayers) and Idaho-specific credits including a grocery credit ($100 per person).
Local Taxes
No local income taxes in Idaho.
Recent Changes
The flat tax rate was reduced to 5.695% for 2025. Idaho's grocery tax credit helps offset the state's sales tax on groceries.
How to Use This Calculator Strategically
Model a raise or job change. With a flat tax, the math is simpler — every additional dollar is taxed at 5.695%. But deductions and credits can still shift your effective rate.
Compare filing statuses. Even with a flat rate, different filing statuses unlock different deduction amounts that can affect your bottom line.
Plan retirement contributions. See how 401(k) or IRA contributions reduce your Idaho taxable income and lower your state tax bill.
Evaluate a move. Compare Idaho's flat 5.695% rate to other states. Depending on your income level, a flat tax state might save you money — or cost you more — compared to a progressive system.
References
- Idaho State Tax Commission. (2025). Individual Income Tax.
This calculator is for educational purposes only and does not constitute tax or financial advice. Tax rates and rules change regularly. Consult a qualified tax professional for guidance specific to your situation.