Idaho Income Tax
Idaho uses a flat income tax rate applied to all taxable income. Combined with federal tax, this determines your total income tax burden.
Why It Matters
Understanding Idaho's income tax structure helps you accurately estimate take-home pay, compare compensation across states, and plan for your total tax burden.
Try the calculator
Open Idaho Income Tax Calculator →How It Works
The calculator computes both your federal and Idaho state income tax to show your combined tax burden. Enter your taxable income to see the breakdown.
Example
A single filer with $75,000 in taxable income in Idaho pays $3,975 in state income tax (flat 5.30% rate), plus $11,414 in federal tax. Total combined: $15,389 — a combined effective rate of 20.5%.
Resources
Frequently Asked Questions
Does Idaho have a standard deduction?
Idaho's deduction rules vary. Some flat-tax states conform to the federal standard deduction, while others have their own. Check your state tax authority for details.
Is Idaho's income tax in addition to federal tax?
Yes. You pay both federal income tax (progressive brackets up to 37%) and Idaho's flat 5.30% state income tax. This calculator shows both combined for your total tax burden.
What is Idaho's income tax rate?
Idaho has a flat income tax rate of 5.30% applied to all taxable income regardless of how much you earn.
Key Terms
Next review: 2027-01-15 • Applies to tax year: 2025