Tools · State Income Tax
Montana Income Tax Calculator (2026)
Estimate your Montana state income tax for 2026. Enter your taxable income and filing status to see what Montana taxes and your effective state rate, broken out line by line.
Montana state income tax calculator
- Taxable income entered
- $75,000
- Montana standard deduction
- −$16,100
- Income taxed by Montana
- $58,900
- Montana income tax
- $2,877
Montana has two brackets for 2026: 4.7% on the first band of income and 5.65% above it (the top rate dropped from 5.9% under HB 337, and drops again to 5.4% in 2027). Montana starts from federal taxable income, so it uses the federal standard deduction.
State figures: Montana Department of Revenue.
Estimate for 2026 state income tax only, based on annual tax brackets — it excludes federal income tax, Social Security and Medicare, local taxes, and any credits. This is general information, not tax advice.
How Montana income tax is figured
Montana runs graduated brackets: higher slices of income are taxed at higher rates. Montana has two brackets for 2026: 4.7% on the first band of income and 5.65% above it (the top rate dropped from 5.9% under HB 337, and drops again to 5.4% in 2027). Montana starts from federal taxable income, so it uses the federal standard deduction.
This estimate covers state income tax only. It does not include federal income tax, Social Security and Medicare, or tax credits. It is an annual-bracket estimate, not your final return. This is general information, not tax advice.
Income tax calculators for other states
Same 2026 engine, each with its own state rules.