Montana capital gains tax estimator

Estimate Montana tax impact from a single sale.

How this calculator works

Step 1 calculates your capital gain using cost basis and sale proceeds. If you provide dates, the tool classifies the holding period for reference.

Step 2 adds the gain to your other Montana taxable income and applies the correct rate: long-term gains use 3%/4.1% thresholds while short-term gains use ordinary brackets.

Step 3 shows the Montana tax impact. The marginal rate reflects the bracket your total income lands in after the gain.

Frequently asked questions

Does Montana have a special long-term gain rate?

Yes. Long-term gains are taxed at 3% up to the filing-status threshold and 4.1% above it.

What if I have a loss?

Losses are displayed for context. Check Montana’s rules for how losses offset gains.

Do I need to adjust for residency?

Part-year and nonresident filers should prorate Montana-source income using the allocation percent on their return.

This tool estimates Montana tax impact only and is not legal or tax advice.