New Mexico is a moderate-tax state that sits at the crossroads of the Southwest's low-tax states (Texas, Nevada) and higher-tax Mountain West states (Colorado). New Mexico's income tax ranges from 1.7% to 5.9%, with Social Security partially taxed for higher incomes and modest retirement income exemptions. The state's unique Gross Receipts Tax (GRT) affects businesses and some consumers differently from traditional sales taxes. This guide explains New Mexico's tax structure and what departing residents need to know.
New Mexico's income tax is graduated with a meaningful top rate for high earners:
| New Mexico Taxable Income (Single) | Rate |
|---|---|
| $0 – $5,500 | 1.7% |
| $5,501 – $11,000 | 3.2% |
| $11,001 – $16,000 | 4.7% |
| $16,001 – $210,000 | 4.9% |
| Above $210,000 | 5.9% |
Most New Mexico earners — those making $16,000–$210,000 — pay primarily at the 4.9% rate. The 5.9% rate only applies to the portion above $210,000, making it a modest surcharge on very high incomes.
New Mexico's Social Security treatment is moderate: incomes below $100,000 (single) / $150,000 (MFJ) get a 100% SS exemption. Above those thresholds, the exemption phases out. For most New Mexico retirees with modest income, Social Security is fully exempt — making NM's treatment better than Kansas (which taxes all SS) but less generous than states with no SS tax at any income level.
New Mexico shares a long border with Texas, and many New Mexicans — particularly in the Las Cruces metro area near El Paso — live close to the Texas border. For New Mexico residents earning $200,000:
The savings become more significant at higher income levels (5.9% rate above $210K) and for capital gains events.
New Mexico uses domicile-based residency:
New Mexico defines a resident as someone domiciled in New Mexico OR someone who maintains a permanent place of abode in New Mexico and spends more than 185 days in the state. The 185-day test is a second path to residency beyond domicile — residents who want to depart should ensure they spend fewer than 185 days in New Mexico in the departure year AND change their domicile to another state. The standard departure evidence applies: change driver's license, voter registration, vehicle registration, and primary banking relationships.
New Mexico's military retirement income exemption means many military retirees pay very little New Mexico income tax (military pension exempt + SS exempt = effectively $0 state tax on most military retirement income). For military retirees, the financial motivation to leave New Mexico is reduced compared to civilian retirees. New Mexico's relatively low property tax and warm climate make it popular with military retirees from nearby installations.
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