Montana Capital Gains Tax Calculator 2026

Calculate your combined federal + MT state capital gains tax on stocks, crypto, real estate, and other investments. Montana taxes capital gains at rates up to 6.75%.

📊 Calculate Your Montana Capital Gains Tax

Purchase Price ($)

Sale Price ($)

Filing Status

Holding Period

Other Taxable Income ($)

Investment Losses ($)

Capital Gain

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Federal Tax

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MT State Tax

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NIIT (3.8%)

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Total Tax

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After-Tax Proceeds

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Effective Fed Rate

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Effective State Rate

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Combined Effective Rate

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📋 Montana Capital Gains Tax Overview

6.75%

State CG Rate

1-6.75%

Rate Structure

20%

Max Federal Rate

3.8%

NIIT Surcharge

2% capital gains credit available for Montana-source gains

How Capital Gains Tax Works in Montana

When you sell an investment — stocks, bonds, cryptocurrency, real estate, or other assets — for more than you paid, the profit is a capital gain. In Montana, capital gains are generally taxed as ordinary income at rates up to 6.75%, on top of federal capital gains tax.

Federal Capital Gains Tax Rates (2026)

0% rate: Single filers with taxable income up to $47,025 (MFJ: $94,050)
15% rate: Single filers $47,025–$518,900 (MFJ: $94,050–$583,750)
20% rate: Single filers above $518,900 (MFJ: above $583,750)
3.8% NIIT: Net Investment Income Tax applies to income above $200K (single) or $250K (MFJ)

Short-Term vs. Long-Term Capital Gains

Short-term gains (assets held less than 1 year) are taxed at your ordinary income tax rate — which can be as high as 37% federally plus 6.75% in Montana. Long-term gains (assets held 1+ years) receive preferential federal rates of 0%, 15%, or 20%, but Montana does not offer a preferential state rate — gains are taxed as ordinary income.

5 Strategies to Reduce Capital Gains Tax in Montana

Hold investments for 1+ years — Long-term gains qualify for 0/15/20% federal rates instead of up to 37%
Tax-loss harvesting — Sell losing investments to offset gains (up to $3,000 excess losses deductible)
Use tax-advantaged accounts — 401(k), IRA, Roth IRA, HSA shield gains from taxation
Qualified Opportunity Zones — Defer and potentially reduce capital gains by investing in QOZ funds
Consider your timing — Sell in years when your income is lower to stay in a lower federal bracket

Montana-Specific Capital Gains Rules

2% capital gains credit available for Montana-source gains. Combined with federal rates, investors in Montana could pay up to 30.6% on long-term gains or up to 47.5% on short-term gains. Tax planning is essential for Montana residents with significant investment income.

❓ Frequently Asked Questions

What is the capital gains tax rate in Montana?

Montana taxes capital gains at rates up to 6.75%. 2% capital gains credit available for Montana-source gains. Combined with federal tax (0-20%) and the potential 3.8% NIIT, your total rate could reach 30.6%.

How do I calculate capital gains tax on stocks in Montana?

Subtract your cost basis (purchase price + fees) from your sale price to determine your gain. If held over 1 year, apply federal long-term rates (0/15/20% based on income) plus Montana's state rate (up to 6.75%). Our calculator above handles all of this automatically.

Does Montana tax cryptocurrency capital gains?

Yes — cryptocurrency is treated as property by the IRS and by Montana. Crypto gains are taxed the same as stocks or other investments — at your ordinary income tax rate for short-term gains or preferential federal rates for long-term gains, plus the Montana state rate of up to 6.75%.

Is there a capital gains exclusion for home sales in Montana?

Yes — the federal home sale exclusion allows you to exclude up to $250,000 in gains ($500,000 for married couples filing jointly) if you've lived in the home for at least 2 of the last 5 years. This exclusion applies to both federal and Montana state taxes. Gains above the exclusion limit are taxed at your applicable rates.

What is the Net Investment Income Tax (NIIT)?

The NIIT is a 3.8% federal surtax on investment income (capital gains, dividends, interest, rental income) for individuals with modified AGI above $200,000 (single) or $250,000 (married filing jointly). It applies in all states, including Montana.

How can I reduce my capital gains tax in Montana?

Key strategies include: holding investments for over 1 year (lower federal rate), tax-loss harvesting (offsetting gains with losses), using tax-advantaged accounts (401k, IRA, Roth), donating appreciated assets to charity (avoid gains entirely), and timing your sales to stay in lower tax brackets.

🗺️ Compare Capital Gains Tax by State

Alabama — 5% Mississippi — 5% Arkansas — 4.4% Idaho — 5.8% North Dakota — 2.5% Wyoming — 0% Ohio — 3.5% Florida — 0% View All 50 States →