Montana State Income Tax Calculator
Calculate your Montana state income tax liability for 2026
About Montana State Income Tax
Tax Brackets & Rates (2026)
| Income Range | Tax Rate |
|---|---|
| $0 - $20,500 | 4.7% |
| $20,500 - $49,900 | 5.9% |
| Over $49,900 | 6.5% |
Deductions & Exemptions
- Standard Deduction: $5,340
- Personal Exemption: $2,820 per taxpayer
How Montana State Income Tax Works
Montana uses a progressive tax system with 3 tax brackets. As your income increases, different portions are taxed at higher rates. Only the income within each bracket is taxed at that bracket's rate.
Tips for Montana Taxpayers
- File your state return by the same deadline as federal taxes (typically April 15)
- Consider itemizing deductions if they exceed the standard deduction
- Make estimated quarterly payments if you're self-employed or have significant investment income
- Keep detailed records of all income, deductions, and tax payments
- Consider contributions to tax-advantaged accounts like 401(k)s and IRAs to reduce taxable income