Idaho Tax Calculator 2026
Idaho currently uses a flat state income tax rate of 5.80%.
ID
Idaho state income tax estimator for filing year 2026
Use this page to estimate your 2026 state tax filing for Idaho. The calculator pre-selects Idaho and applies the flat-tax structure so you can model withholding and net owed/refund faster.
Idaho tax profile snapshot
- State: Idaho (ID)
- Filing year: 2026
- Tax year data applied: 2025
- Idaho currently uses a flat state income tax rate of 5.80%.
Need federal and state in one view?
Use the full Tax Calculators page for side-by-side federal and state workflows.
Frequently asked questions
Does Idaho have state income tax for filing year 2026?
Yes. Idaho applies state income tax rules in the current dataset for tax year 2025.
What Idaho rate assumptions are used on this page?
Idaho is modeled with a flat rate of 5.80%.
Should I use this page or the main tax calculator?
Use this page for a state-specific workflow preloaded to one state and year. Use the main tax calculator if you need both federal and state tabs together or want to switch states quickly.