Idaho Income Tax Calculator 2026
Idaho taxes income at a single flat 5.695% rate for 2026 — estimate yours below.
Idaho's flat 5.695% income tax, explained
Idaho (ID) taxes income at a single flat 5.695% rate rather than graduated brackets, so — unlike the federal system — every dollar of Idaho taxable income is taxed at the same rate. That makes the state calculation simple, but it is separate from federal income tax and from Idaho sales tax.
What to know about Idaho tax
- Idaho replaced its graduated income tax with a single flat rate applied above a low income floor.
- Groceries are taxed, but Idaho provides a per-person grocery tax credit to offset it.
- Most local jurisdictions cannot levy a general sales tax, so the combined rate is close to the state base in most areas.
Frequently Asked Questions
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Calculate →Disclaimer
This calculator provides estimates for informational and educational purposes only. SmartTaxCalcs does not provide tax advice. Your actual tax liability may differ based on your specific situation, recent law changes, and circumstances not modeled here (e.g., AMT, NIIT, special credits). We strongly recommend consulting a qualified tax professional (CPA, Enrolled Agent, or tax attorney) before filing or making financial decisions.
Data source: IRS Revenue Procedure / state Departments of Revenue. Last data update: May 19, 2026.