Does New Mexico Tax Social Security Disability Benefits?

New Mexico has a complicated history with Social Security taxation — and for SSDI recipients, the answer has changed in recent years. Understanding where the state currently stands, and how federal rules layer on top of state rules, matters a lot when you're budgeting around a fixed disability income.

The Short Answer: New Mexico Has Moved to Exempt Social Security Income

For many years, New Mexico was one of the minority of states that taxed Social Security benefits, including SSDI. That changed with legislation enacted in 2022, which phased in a full exemption for Social Security income based on income thresholds — and by 2024, New Mexico fully exempts Social Security benefits from state income tax for most recipients.

Specifically, New Mexico now excludes all Social Security income — including SSDI — from state taxable income, regardless of the recipient's age or filing status. This is a meaningful shift. Previously, only lower-income residents qualified for any exemption, and many SSDI recipients with modest additional income found themselves owing state taxes on their benefits.

If you filed New Mexico state taxes in prior years and paid tax on your SSDI benefits, those rules no longer apply going forward. The exemption applies to both SSDI (Social Security Disability Insurance) and retirement Social Security benefits.

Federal Taxation Still Applies — That's a Separate Track

State exemption doesn't mean your SSDI is untaxed everywhere. Federal taxation of Social Security benefits operates independently of what any state does, and it can still apply depending on your total income.

The IRS uses a calculation based on your "combined income" — which is your adjusted gross income, plus nontaxable interest, plus 50% of your Social Security benefits. Here's how federal taxation of Social Security benefits generally works:

These thresholds have not been adjusted for inflation since they were established — a fact worth noting, since even modest additional income can push someone into taxable territory. The maximum taxable portion is 85%; Social Security benefits are never 100% federally taxable.

What Counts as "Additional Income" for This Calculation?

This is where SSDI recipients sometimes get tripped up. Many assume that because SSDI is their primary income, their combined income stays low. That's often true — but not always.

Income that can factor into the federal combined income calculation includes:

• Wages or self-employment income (including during a Trial Work Period)
• Pension or retirement income
• Investment income — dividends, capital gains, rental income
• Interest income, including from tax-exempt bonds
• Spousal income if filing jointly

Someone receiving SSDI of, say, $1,500/month with no other income will likely fall well below the federal threshold. But someone who also receives a small pension, rental income, or has a working spouse filing jointly may cross into taxable territory at the federal level — even with modest total income.

SSDI vs. SSI: The Distinction Matters Here 🔍

SSI (Supplemental Security Income) is not the same as SSDI, and it is never taxable — at either the federal or state level. SSI is a needs-based program funded by general tax revenues. SSDI is an earned benefit tied to your work record and Social Security contributions.

If you receive both SSDI and SSI (called "concurrent benefits"), only the SSDI portion factors into any tax calculation. The SSI portion does not.

Back Pay and Lump-Sum Payments

SSDI approvals frequently include back pay — a lump sum covering the period between your established onset date and your approval. Receiving a large lump-sum payment can look like a high-income year on paper, which sometimes triggers federal taxation even for people whose ongoing annual income is low.

The IRS provides a lump-sum election method that allows recipients to recalculate taxes by allocating the back pay to the prior years it was meant to cover, rather than treating it all as income in the year received. This can reduce or eliminate a tax hit from back pay. A tax professional familiar with Social Security income can walk through whether this election makes sense in a given situation.

What Shapes Your Actual Tax Picture in New Mexico

Even with the state exemption in place, individual outcomes vary based on:

• Total household income — the more non-SSDI income you have, the more likely federal taxation applies
• Filing status — single filers hit thresholds at lower income levels than joint filers
• Whether you received back pay in a given tax year
• Other deductions and credits that reduce your adjusted gross income
• Whether you also receive SSI, which is always excluded

Someone receiving SSDI as their sole income, filing as a single individual, will likely owe no taxes at either the state or federal level. Someone with additional income sources, or a working spouse, may owe federal taxes on a portion of benefits — even though New Mexico no longer taxes those benefits at the state level.

The state exemption removes one layer of tax exposure for New Mexico SSDI recipients. Whether federal taxation applies is the question that depends entirely on the rest of your financial picture — and that calculation looks different for every household.