New Mexico
Reviewed October 2026Federal §453 conformity
Yes — New Mexico starts from the federal return and taxes installment gain as payments arrive at a 5.9% top rate, with a capital gain deduction that was narrowed for 2025 and later years: the greater of net capital gain up to $2,500, or 40% of up to $1,000,000 per year of gain from the sale of a business allocated to New Mexico. For a qualifying business sale that means up to $400,000 of deduction each year — and because the cap resets annually, an installment sale that brings in $1,000,000 of gain a year keeps every dollar inside the 40% deduction, where a lump sum would get the deduction once. Gain above the cap, and gain that is not business-sale gain, is taxed at the full rate; the note's interest is ordinary income at full rates.
Nonresident sourcing
Gain from New Mexico real estate or a business operating here is New Mexico income for sellers anywhere, with the 40% business-sale deduction available on gain from a New Mexico business (up to $1,000,000 of gain a year); intangible gain generally follows the seller home.
Withholding
New Mexico imposes no closing-table withholding on nonresident real estate sellers. Pass-throughs withhold on nonresident owners' New Mexico income each recognition year unless composite filing or the PTE election covers it.
Selling, then moving (residency change)
New Mexico-source gain stays taxable here after a move; other gain travels with the seller, and no rule accelerates deferred gain at the border. The Texas line sits close for much of the state — the usual rules about genuine, documented, pre-sale moves apply.
Pass-through entity (PTE) tax election
New Mexico's PTE election is available at the top rate with owner credits, on the usual annual keep-the-entity-alive terms. As with the other exclusion states, confirm the entity-level computation's treatment of the 40% business-sale deduction (and its $1,000,000 annual cap) before electing in a heavy gain year.
Estate and IRD
New Mexico has no estate or inheritance tax. At death the federal rules apply — heirs pay income tax as payments arrive, with the 40% deduction available only to the extent the gain component qualifies as New Mexico business-sale gain within the $1,000,000 annual cap. New Mexico adds one distinction the other exclusion states lack: it is a true community property state, so a married couple's appreciated assets generally take a full basis step-up on both halves at the first death — the double step-up other states' couples have to opt into, delivered here by default.
Planning notes
New Mexico's list: confirm the gain qualifies as New Mexico business-sale gain before applying the 40% deduction, size the annual payments against the $1,000,000-per-year cap so the deduction renews each year, and — for married sellers — put the community property basis question first, because a sale sequenced after a first death may have far less gain to structure in the first place.
For 2025 and later years New Mexico's deduction is 40% of up to $1,000,000 a year of gain from the sale of a New Mexico business (other gain gets at most $2,500). A lump-sum sale uses that $400,000 deduction once; an installment sale recognizing up to $1,000,000 of qualifying gain each year uses it every year. Confirm the gain is business-sale gain allocated to New Mexico before counting on it.
New Mexico is a true community property state: both halves of a married couple's community assets step up in basis at the first death. Before structuring a sale, ask the sequencing question — a sale after that step-up may have dramatically less gain to defer at all.
Educational information, current as of the October 2026 review. State law changes; confirm treatment with a qualified advisor before structuring a transaction.
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