Montana Income
Tax Rates & Rules
Montana has a progressive state income tax with rates up to 5.9%. Here's how the brackets break down.
Montana Income Tax Brackets
2025 tax year rates, most recently confirmed by the state Department of Revenue.
Single / Individual
| Taxable Income | Rate |
|---|---|
| $0 – $21,100 | 4.7% |
| Over $21,100 | 5.9% |
Married Filing Jointly
| Taxable Income | Rate |
|---|---|
| $0 – $42,200 | 4.7% |
| Over $42,200 | 5.9% |
Montana simplified from 7 brackets to 2 as of 2024. Standard deduction (conforms to federal): $15,750 (Single) / $31,500 (MFJ). Montana does not tax Social Security benefits.
Sources: Montana Dept. of Revenue — 2025 Tax Rates and Deductions. Last verified: August 14, 2026.
How Montana Income Tax Works
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Frequently Asked Questions
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