New Mexico Capital Gains Tax Calculator 2026

New Mexico Capital Gains Tax Rules

New Mexico taxes capital gains as ordinary income at 2026 rates from 1.5% to 5.9%, after a net capital gain deduction. Since tax year 2025 the deduction is the greater of your net long-term capital gain up to $2,500, or 40% of up to $1,000,000 of gain from the sale of a New Mexico business (Schedule PIT-ADJ, line 16). Short-term gains get no deduction. This state tax is separate from — and in addition to — the federal capital gains tax you owe to the IRS.

Understanding New Mexico's capital gains rules is essential for investors, homeowners selling property, and business owners who plan to sell assets. The calculator above computes your estimated federal and New Mexico state capital gains tax based on your sale price, cost basis, holding period, and income. It subtracts the 2026 federal standard deduction ($16,100 single, $32,200 married filing jointly, $24,150 head of household) from the income you enter, stacks the gain on top of your other income, and taxes each slice at its own rate.

Federal vs New Mexico Capital Gains Tax

The federal tax on a gain depends on your taxable income and on how long you held the asset. For long-term gains (held more than 12 months), the 2026 federal rates set by IRS Rev. Proc. 2025-32 are 0% on taxable income up to $49,450 single / $98,900 married filing jointly / $66,200 head of household, 15% up to $545,500 single / $613,700 joint / $579,600 head of household, and 20% above those thresholds. The gain is stacked on top of your other income, so one sale can be taxed partly at 0%, partly at 15% and partly at 20%. Short-term gains are taxed as ordinary income at the 2026 federal brackets of 10% to 37%. A 3.8% Net Investment Income Tax is added on the lesser of the gain or the amount by which your modified adjusted gross income exceeds $200,000 (single or head of household) or $250,000 (married filing jointly).

Worked example (2026): a single filer with $90,000 of other income sells stock held for two years at a $50,000 gain. Federal tax is $7,500 (the whole gain falls in the 15% band) and New Mexico tax is $2,328, a combined $9,828 or 19.7% of the gain. Sold after 11 months instead, the same gain is short-term: $11,364 federal plus $2,450 New Mexico tax, $13,814 in total. The calculator above reproduces both results.

New Mexico Cap Gains Strategies & Exemptions

Several strategies can help New Mexico taxpayers reduce their capital gains tax burden. First, hold assets for more than 12 months to qualify for the lower long-term federal rate. Second, harvest capital losses to offset gains — if you have losing positions, selling them in the same tax year can reduce your net taxable gain. Third, use tax-advantaged accounts (401k, IRA, HSA) to shelter future investment growth from both federal and New Mexico state tax.

For New Mexico homeowners, the federal home-sale exclusion allows you to exclude up to $250,000 (single) or $500,000 (married filing jointly) of gain from the sale of a primary residence, provided you meet the 2-of-5-year ownership and use tests. The calculator does not apply this exclusion, so enter only the gain that remains after it. Consult a New Mexico tax professional to understand which exclusions apply to your specific situation.

Always work with a qualified tax professional before executing large asset sales. Tax laws change, and individual circumstances — such as installment sales, like-kind exchanges (1031 exchanges for real estate), or business asset sales — can significantly affect your total tax liability.

Capital Gains Tax Calculator New Mexico: The Net Capital Gain Deduction Since 2025

New Mexico's capital gain deduction changed in tax year 2025. Per the New Mexico Taxation & Revenue 2025 PIT-ADJ instructions (line 16), taxpayers can deduct the greater of 100% of net capital gains up to $2,500, or 40% of up to $1,000,000 of net capital gain from the sale of a business allocated or apportioned to New Mexico. Before 2025 the deduction was the greater of $1,000 or 40% of all net capital gain, so the old 40% deduction no longer applies to stock, mutual fund or real estate gains. Only net long-term gains count. That means a $50,000 long-term stock gain now gets a $2,500 deduction, leaving $47,500 taxed as ordinary income; at the 4.9% rate that applies to a single filer's taxable income between $66,500 and $210,000 the deduction saves about $123. The capital gains tax calculator new mexico above applies the $2,500 deduction automatically, and the 40% business-sale deduction when you tick the box. Updated 2026-10-07.

New Mexico Capital Gains: $150,000 Home Sale Worked Example with Deduction

Consider an Albuquerque single filer who bought a home in 2016 for $220,000, added $30,000 in improvements (adjusted basis $250,000), and sells in 2026 for $475,000. Selling costs of $28,000 give a net realized gain of $197,000. Because they meet Section 121 primary residence tests, the first $250,000 is federally excluded — the entire $197,000 gain is federal-tax-free. New Mexico conforms to Section 121, so the state also excludes it. Total tax: $0 federal, $0 New Mexico. Now change the price to $650,000 (net gain $372,000 after selling costs and basis). Section 121 excludes $250,000, leaving $122,000 taxable. With $80,000 of other income the federal tax is 15% LTCG = $18,300, plus $76 of Net Investment Income Tax because income plus gain just passes $200,000. For NM state, the net capital gain deduction is $2,500, so $119,500 is taxed as ordinary income on top of the other income = $5,850 NM state tax. Total combined tax: $24,226. See IRS Sale of Home Topic 701 for federal residency tests. Updated 2026-10-07.

Last updated: October 2026. Federal figures: IRS Rev. Proc. 2025-32 (2026 capital gains thresholds, brackets and standard deduction), IRS Topic 409 and IRS Topic 559 (Net Investment Income Tax). New Mexico: New Mexico 2025 PIT-ADJ instructions.