Clear Money Guide
What this state guide covers
A quick view of the questions, practical details and source notes below.
Updated August 12, 2026. Quick answer: Yes. New Mexico taxes conversion income as ordinary income at its 1.5%-5.9% rates, and it has no retirement-income exclusion that could shelter it. The only offset is the age-65 exemption of up to $8,000 against income from any source, and it phases out as income rises — so the conversion itself shrinks it.
Confidence note: high. New Mexico’s own taxpayer guidance describes the age-65 exemption as income-dependent and offers no retirement-income exclusion, so there is no conversion-specific relief to look for.
Why a conversion is a different question from a withdrawal
Almost every state summary answers “how does New Mexico tax retirement income?” That is a question about distributions. A Roth conversion is not a distribution in the ordinary sense — it is a voluntary election to recognise income now in exchange for tax-free growth later. Whether a state’s retirement exclusion reaches that election is a separate question, and it is the one that decides your bill.
There is no retirement exclusion to argue about here, which at least makes the maths clean: the converted amount is added to New Mexico taxable income in the conversion year. The $8,000 senior exemption is not a retirement-income rule — it applies to income from any source, and it shrinks as that income rises.
Because the state cost is certain, the lever that matters in New Mexico is when and how much — and a converter of 65 or older should count the phased-out $8,000 exemption as part of the cost of a large conversion.
What New Mexico does with the converted amount
State income tax: graduated, 1.5% to 5.9% top rate (bracket structure restructured effective TY2025 by HB 252 of 2024)
How New Mexico treats IRA and plan income: Pensions, 401(k) and IRA withdrawals taxable. Age 65+ may claim up to an $8,000 exemption against all income, phased out at moderate incomes (NMSA § 7-2-5.2); persons age 100+ with no dependents are fully exempt (NMSA § 7-2-5.7).
What to ask a preparer about New Mexico
None on eligibility — it is taxable. Ask instead how much of the age-65 exemption this conversion phases out, and how splitting it across two tax years changes the bracket outcome.
The state bill is only half the decision
What a conversion costs depends on the federal bracket it fills as well as the state you are resident in when you make it, and an adviser can price both together before you decide how much to convert.
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Converting around a move
Converting in the year you move into New Mexico is the case that catches people. Residency at the moment of conversion is what generally determines which state gets to tax it, so a conversion executed a week before a move and one executed a week after can produce different bills.
Four separate taxes change when you move, not one: income tax on withdrawals, treatment of Social Security, estate tax, and inheritance tax. A state that looks good on conversions can be worse on the other three.
The state bill is the smaller half
Whatever New Mexico does, the conversion is federal ordinary income first. The federal bracket you land in, and whether the conversion pushes you over an IRMAA threshold two years later, will usually move more money than the state line does. The state answer tells you whether to convert here; the federal answer tells you how much to convert at once.
Paying the tax from outside the account matters more than either. Using converted dollars to pay the bill shrinks the balance that was the entire point of converting.
Sources
Authority: NMSA 1978 § 7-2-5.14 (Social Security exemption); NMSA 1978 § 7-2-5.13 (armed forces retirement pay); NMSA 1978 § 7-2-5.2 (age 65+ exemption); NM Taxation & Revenue: Social Security Income Tax Exemption page.
Compiled from state statutes, session laws and revenue-department publications and adversarially verified in July 2026. Dataset confidence for New Mexico: high.
This page states what the cited authority says. It is not tax advice, and a conversion large enough to matter is worth putting in front of a preparer who can see your whole return.