Montana capital gains tax, 2026
Montana taxes capital gains under its own rule: long-term capital gains have their own rates, 3.0% and 4.1%; the 2026 thresholds changed with the 2025 rate cuts and are not published yet. We are checking that rule against the state's tax authority before showing a figure; the calculator below already shows the federal tax.
Questions
Does Montana tax capital gains?
Yes, under its own rule: long-term capital gains have their own rates, 3.0% and 4.1%; the 2026 thresholds changed with the 2025 rate cuts and are not published yet.
What does the federal government take?
On a $100,000 long-term gain with $80,000 of other income, a single filer pays $15,000 of federal tax.
State brackets for 2026 from the Tax Foundation; federal rates from IRS Rev. Proc. 2025-32. See every state. Estimates, not tax advice.
Updated: