Tools · Capital Gains Tax
New Mexico Capital Gains Tax Calculator (2026)
Estimate the tax on your capital gains in New Mexico for 2026. Enter your gain, holding period, and other income to see federal long- or short-term tax, the 3.8% Net Investment Income Tax, and New Mexico’s share, broken out line by line.
New Mexico capital gains tax calculator
How to read the rows below: the slice of your gain → the tax on that slice.
- Gain taxed at 0% (long-term)
- $15,550 → $0
- Gain taxed at 15% (long-term)
- $4,450 → −$668
- Federal long-term capital gains tax
- −$668
- Net Investment Income Tax (3.8%)
- $0
- New Mexico income tax on gain
- −$926
- Total capital gains tax
- $1,593
New Mexico taxes capital gains as ordinary income. New Mexico has six graduated brackets from 1.5% to 5.9% under the HB 252 restructure that took effect in 2025. It follows the federal standard deduction ($16,100 single / $32,200 married-jointly for 2026) and adds a $4,000 exemption per person. Most Social Security income is exempt.
Federal: IRS Revenue Procedure 2025-32 (IR-2025-103) · Social Security Administration. State: New Mexico Taxation and Revenue Department.
Estimate for 2026. Long-term gains are stacked on top of your other taxable income across the 0/15/20% federal breakpoints; short-term gains are taxed as ordinary income. The 3.8% Net Investment Income Tax, an extra federal surtax on investment income, applies once your income clears the threshold. Excludes state credits, the alternative minimum tax, and loss carryovers. This is general information, not tax advice.
How capital gains tax works in New Mexico
Long-term gains (assets held more than a year) get the federal 0/15/20% rates — but the rate depends on where the gain lands once it is stacked on top of your other taxable income, so part of a gain can be taxed at 0% and the rest at 15%. Short-term gains are taxed as ordinary income. On top of that, the 3.8% Net Investment Income Tax applies once your income clears $200,000 (single) or $250,000 (married-jointly).
New Mexico taxes capital gains as ordinary income, at the same rate as your wages. New Mexico has six graduated brackets from 1.5% to 5.9% under the HB 252 restructure that took effect in 2025. It follows the federal standard deduction ($16,100 single / $32,200 married-jointly for 2026) and adds a $4,000 exemption per person. Most Social Security income is exempt.
This is an annual-bracket estimate, not your final return. It excludes the alternative minimum tax, loss carryovers, and state credits. It is general information, not tax advice. Federal figures: IRS Revenue Procedure 2025-32 (IR-2025-103) · Social Security Administration.
Capital gains calculators for other states
Same 2026 engine, each with its own state rules.