New Mexico Tax on Capital Gains

New Mexico taxes capital gains as ordinary income, meaning gains are included in your regular taxable income and taxed under the state’s graduated personal income tax system, with rates reaching up to 5.9% for higher-income taxpayers.

However, New Mexico is somewhat unique because it offers a capital gains deduction, which can significantly reduce the amount of gain subject to state tax. That said, this deduction changed beginning in 2025, making the rules more restrictive.

How Capital Gains Are Taxed in New Mexico

A capital gain is the profit from selling an asset for more than its purchase price. Common taxable assets include:

• Stocks, ETFs, and mutual funds
• Bonds and other investment securities
• Real estate (primary homes beyond federal exclusions, vacation homes, rentals)
• Business interests and other capital assets

Only the net gain—after basis adjustments and selling expenses—is taxed.

Key Aspects of New Mexico Capital Gains Tax

🔹 Tax Rates

• Capital gains are taxed as ordinary income.
• Rates are graduated, topping out at 5.9% for higher income levels.
• There is no special lower tax rate solely for capital gains.

🔹 Capital Gains Deduction (Through 2024)

For tax years 2024 and earlier: Taxpayers may deduct the greater of:

• 40% of net capital gains, or
• $1,000
• This deduction applies broadly to qualifying long-term capital gains.

🔹 Deduction Changes Starting in 2025

Beginning with the 2025 tax year, the deduction rules become more limited:

The deduction is the greater of:

• $2,500, or
• 40% of the gains from the sale of a New Mexico business
• The deduction is restricted to qualifying New Mexico business sales
• Capital gains from stocks, bonds, and most real estate sales generally no longer qualify for the 40% deduction

This change significantly increases state tax liability for many investors beginning in 2025.

🔹 Short-Term vs. Long-Term Gains

Short-term gains (assets held one year or less)

• Fully taxed as ordinary income
• No special deduction

Long-term gains (assets held more than one year)

• Eligible for the capital gains deduction only if they meet the applicable rules for the tax year

Practical Examples

🏢 Example 1: Selling a New Mexico Business (2025)

A taxpayer sells a New Mexico-based business in 2025 and realizes a $100,000 gain.

• 40% deduction: $40,000
• Taxable gain: $60,000
• $60,000 is taxed at the applicable graduated income tax rates

🏡 Example 2: Real Estate Sale

A taxpayer sells a vacation home in Santa Fe at a profit.

• Federal rules determine the initial gain
• Under 2025+ rules, the gain generally does not qualify for the 40% deduction
• The full taxable gain is included in New Mexico income and taxed at graduated rates

Filing Tips to Reduce Errors and Taxes

✔ Track original purchase prices, improvements, and selling expenses

✔ Separate short-term and long-term gains clearly

✔ Confirm whether a business sale qualifies as a New Mexico business

✔ Apply deductions correctly based on the tax year

✔ Coordinate state reporting with federal capital gains schedules

Why Electronic Filing Is Recommended

New Mexico taxpayers—especially those reporting investment income—are strongly encouraged to file electronically:

• Faster processing and confirmation
• Automatic calculations for deductions and limitations
• Reduced errors when importing federal capital gains data
• Greater accuracy when applying the correct deduction rules for 2024 vs. 2025+
• Quicker refunds, if applicable

Most modern tax software automatically carries capital gains information from your federal return into your New Mexico return, helping ensure compliance with the state’s evolving rules.

Bottom Line

New Mexico taxes capital gains as ordinary income, with rates up to 5.9%, but the state’s deduction rules can significantly affect how much you owe.

While gains enjoyed a broad 40% deduction through 2024, starting in 2025, that benefit is largely limited to qualifying New Mexico business sales.

Because of these changes, accurate reporting—and electronic filing—is more important than ever.