Idaho Salary & Tax Calculator
See exactly how much you're taking home in Idaho. This calculator is pre-filled with the state's 5.8% flat income tax rate so you can get a realistic estimate fast.
Idaho simplified its tax code by switching to a single flat rate of 5.8%, replacing the old system of multiple brackets that once climbed as high as 6.5%. That means every Idaho worker, from an entry-level employee to a senior executive, pays the same marginal state rate once their income clears the standard deduction — there's no bracket creep to worry about. Sitting in the Mountain West, Idaho's rate lands squarely between its no-income-tax neighbors Washington, Nevada, and Wyoming on one side, and higher-tax Oregon (up to 9.9%) on the other. Compared with Utah's 4.65% flat rate just to the south, Idaho is a bit more expensive from a state-tax standpoint. The upside is that Idaho does not permit counties or cities to pile a local income tax on top, so the number you see withheld from your paycheck for state purposes is the whole story. Use the calculator below to plug in your own gross salary and deductions — the 5.8% figure is pre-loaded, but adjust it if you're combining it with your federal effective rate.
*Estimates only. Not tax, financial, or legal advice. Consult a tax professional for precise figures.
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Everything you need to know about using this calculator and the math behind it.
How it Works
Strips away estimated income taxes and common deductions from your gross Idaho salary to reveal your actual take-home (net) pay.
The Formula
Net Pay = Gross Pay - (Federal Tax + Idaho Flat Tax of 5.8% + FICA + Pre-tax Deductions).
Pro Tip
Because Idaho uses one flat rate, your effective state rate barely changes as your income grows — unlike progressive-bracket states, so this calculator's estimate stays fairly accurate across income levels.
Frequently Asked Questions
Does Idaho have a state income tax? +
Yes. Idaho moved to a single flat income tax rate of 5.8% in recent years, replacing its old multi-bracket system. Every dollar of Idaho taxable income above the standard deduction is taxed at that same flat rate.
How does Idaho's income tax compare to its neighbors? +
Idaho's 5.8% flat rate sits above no-income-tax neighbors Washington, Nevada, and Wyoming, but below Oregon's top marginal rate of 9.9%. Compared to Utah's 4.65% flat rate, Idaho is somewhat higher, making it a mid-pack state in the Mountain West.
Do Idaho cities or counties add a local income tax? +
No. Idaho does not authorize cities or counties to levy their own income tax. The 5.8% flat state rate is the only income tax you'll see withheld, aside from federal tax and FICA.
Is Idaho's flat tax better than a bracket system? +
A flat tax simplifies planning since your marginal and effective rates are nearly identical once you account for the standard deduction. It also means raises don't push you into a higher bracket the way progressive systems like Hawaii's or California's can.
What tax rate should I use for this calculator? +
The field is pre-filled with 5.8%, Idaho's flat state income tax rate. Because Idaho has no local income tax, this is close to your actual state withholding rate; just add your federal effective rate for a fuller combined estimate.