Montana Tax Calculator 2026
Montana uses progressive income tax brackets with a top marginal rate of 5.90%.
MT
Montana state income tax estimator for filing year 2026
Use this page to estimate your 2026 state tax filing for Montana. The calculator pre-selects Montana and applies progressive brackets so you can test withholding and projected balance with state-specific rules.
Montana tax profile snapshot
- State: Montana (MT)
- Filing year: 2026
- Tax year data applied: 2025
- Montana uses progressive income tax brackets with a top marginal rate of 5.90%.
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 Montana have state income tax for filing year 2026?
Yes. Montana applies state income tax rules in the current dataset for tax year 2025.
What Montana rate assumptions are used on this page?
Montana is modeled with progressive brackets, with a top marginal bracket rate of 5.90%.
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.