Montana Income Tax Guide for 2026
Overview
Montana uses a progressive income tax system with rates ranging from 4.7% to 5.65%. Capital gains are taxed at separate rates ranging from 3% to 4.1%. The state offers a standard deduction of $16,100 for single filers.
Income Tax Rates
Single Filers
| Income Range | Tax Rate |
|---|---|
| Up to $47,499 | 4.7% |
| $47,500+ | 5.65% |
Married Filing Jointly
| Income Range | Tax Rate |
|---|---|
| Up to $94,999 | 4.7% |
| $95,000+ | 5.65% |
Capital Gains Tax
Single Filers
| Income Range | Tax Rate |
|---|---|
| Up to $47,499 | 3% |
| $47,500+ | 4.1% |
Married Filing Jointly
| Income Range | Tax Rate |
|---|---|
| Up to $94,999 | 3% |
| $95,000+ | 4.1% |
Deductions & Exemptions
| Type | Amount |
|---|---|
| Standard Deduction (Single) | $16,100 |
| Standard Deduction (Married Filing Jointly) | $32,200 |
Additional Information
- Age 65+ subtraction ($5,660 for 2025, indexed annually)
- HB 337 (2025): for 2026 the top rate drops from 5.9% to 5.65% and the 4.7% bracket widens to $47,500 single / $95,000 married; for 2027 the top rate drops to 5.4% on income over $65,000 / $130,000
- Montana taxable income starts from federal taxable income, so the federal standard deduction applies; no personal or dependent exemptions
Charts
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Sources
The 2026 figures for Montana on this page were compiled from the following official government publications:
- HB337: 2026-2027 Montana Individual Income Tax Changes (Montana Department of Revenue)
- 2025 Tax Rates and Deductions (Montana Department of Revenue)
- Montana Tax Simplification Resource Hub (Montana Department of Revenue)
- IRS releases tax inflation adjustments for tax year 2026, including amendments from the One, Big, Beautiful Bill (IRS newsroom)
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Start comparingLast updated: September 15, 2026
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