Montana taxes individual income at two rates under House Bill 337 (2025). For tax year 2026: 4.7% on taxable income up to $47,500 for single filers and married filing separately, up to $71,250 for heads of household, and up to $95,000 for married couples filing jointly and surviving spouses; 5.65% on income above those amounts. For tax year 2027 the 4.7% bracket widens to $65,000 / $97,500 / $130,000 and the top rate drops to 5.4%. Long-term capital gains are taxed separately at 3.0% and 4.1%, with brackets matched to the ordinary-income ranges, and from 2026 the Montana earned income tax credit equals 20% of the federal credit (Montana Department of Revenue).
“4.7% on taxable income* $0.00 to $95,000 $0.00 to $71,250 $0.00 to $47,500 5.65% on taxable income* over $95,000 over $71,250 over $47,500”
Read on Nov 13, 2026 from revenue.mt.gov.
Checked once · Nov 13, 2026