State guide
New Mexico property taxes (2026)
✓ Verified August 2026 against official county pages — 3 sources linked below.
County pages for New Mexico are on the way — the statewide dates below apply everywhere, and county pages will add local rates, contacts, and exact appeal windows.
How New Mexico property taxes work
New Mexico property taxes split into halves: the first due November 10 (delinquent after December 10) and the second due April 10 (delinquent after May 10), billed by the county treasurer. Homes are taxed on one-third of their taxable value.
The document to watch is the Notice of Value, mailed by county assessors in April (May in some counties). It is not a bill — it's your one chance at the value: protests must be filed with the assessor within 30 days of the mailing date.
Residential values are capped: taxable value can rise at most 3% a year while you own the home — but the cap resets to market when a property sells, which is why new buyers' bills jump past their neighbors' ('tax lightning,' locals call it).
Exemptions are claimed through the assessor: the head-of-family exemption, veteran exemptions (expanded substantially by 2024 constitutional amendments), and a valuation freeze for lower-income homeowners 65+ or disabled.
When payments are due
Two halves: due November 10 (delinquent after December 10) and April 10 (delinquent after May 10).
| Payment | Due | Delinquent after | Notes |
|---|---|---|---|
| First half (2026 taxes) | November 10, 2026 | December 10, 2026 | Bills mail November 1; delinquent after December 10 |
| Second half | April 10, 2027 | May 10, 2027 | Delinquent after May 10 |
How to appeal your assessment
The statewide rule: Protest to your county assessor within 30 days of the day your Notice of Value was mailed (notices mail in April in most counties)
The 30-day protest window is the only regular chance at the value — by the time the November bill arrives, it's settled. New owners should also use this window to (re)claim exemptions that dropped at the sale.
- Read your Notice of Value (April)Check the full value, the 3%-capped taxable value, and that your exemptions survived any ownership change.
- File your protest within 30 daysA written petition to the county assessor — free; larger counties take filings online.
- Meet with the assessor's officeMany protests settle informally with comparable sales from around January 1.
- Present to the Valuation Protests BoardUnresolved protests get a formal hearing before the county board.
- Escalate if neededBoard decisions can be appealed to district court.
County pages have the exact local deadlines, forms, and filing links.
Statewide exemptions
| Exemption | What it's worth | Deadline |
|---|---|---|
| Head-of-family exemption | A modest taxable-value exemption for New Mexico resident heads of household — small, but free and renewable | Claim with the county assessor (within the protest window after a purchase) |
| Veteran exemptions | Expanded by 2024 constitutional amendments: a larger base exemption for honorably discharged veterans and a disability-scaled exemption up to full exemption at 100% — amounts index going forward | Claim with the county assessor with your NMDVS certificate |
| 65+/disabled low-income valuation freeze | Freezes the taxable value for homeowners 65+ or disabled under the state income limit | Apply with the county assessor (three consecutive annual filings make it permanent in most counties) |
Reassessment
Assessors update values annually toward market, but a residence's taxable value can rise at most 3% a year while ownership is unchanged — sales reset it to market for the buyer.
Value notices (Notice of Value) usually mail in April.
Common questions
- When are property taxes due in New Mexico?
- Halves: November 10 and April 10, with delinquency after December 10 and May 10. County treasurers mail bills November 1.
- How do I protest my New Mexico value?
- File with your county assessor within 30 days of your Notice of Value's April mailing — free. It moves from an informal meeting to the county Valuation Protests Board if needed. The November bill is too late.
- What is 'tax lightning'?
- The jump a buyer sees when the 3% cap resets: the seller's taxable value grew at most 3% a year, but a sale resets it to market for you. Budget from the purchase price, not the seller's bill.
- What exemptions can New Mexico homeowners claim?
- The head-of-family exemption, veteran exemptions expanded by the 2024 constitutional amendments (scaling to full exemption at 100% disability), and a taxable-value freeze for lower-income homeowners 65+ or disabled — all filed through your county assessor.
- Why is my taxable value a third of my home's value?
- New Mexico assesses residential property at one-third of taxable value, and rates apply to that third — after the 3% cap does its work. Two-thirds of your home's paper value never sees a mill.
Sources
Every fact on this page comes from an official page. Check them yourself:
- NMSA § 7-38-24 — protests — checked 2026-08-12
- Doña Ana County Treasurer — FAQ — checked 2026-08-12
- Santa Fe County Assessor — FAQs — checked 2026-08-12