State Guide
How to Appeal Your Property Taxes in New Mexico (2026 Guide)
If you own a home in New Mexico, your county assessor sets its market value — what it would sell for — and that number, not the smaller taxable figure, is the one you challenge. Every year the county mails a Notice of Value, and that notice starts your clock.
The New Mexico deadline: 30 days from your Notice of Value
New Mexico's protest deadline is the later of April 1 or 30 days after the county mails your Notice of Value (NMSA §7-38-24). Counties mail Notices of Value on their own schedule — most target early April, but some run later (Bernalillo County mailed in May in a recent year) — so the reliable move is to read the mailing date on your notice and count 30 days from there.
You file your protest with the county assessor, which routes it to an informal review and then to the county valuation protests board (or a formal protest with the assessor). If that doesn't resolve it, the next step is district court.
How New Mexico assesses your home
New Mexico values your home at its 100% market value, and that's the value you appeal. The 33⅓% "taxable value" you see on your notice is a downstream constitutional ceiling applied after the market value is set (NM Const. Art. VIII §1; NMSA §7-36-15) — it is not a fraction you contest and not evidence you're over-assessed. Compare your comparable sales to the full market value; win a lower market value, and the taxable figure drops right along with it.
| Category | New Mexico |
|---|---|
| Assessment basis | You appeal the 100% market value; the 33⅓% taxable value is a downstream ceiling (Art. VIII §1) |
| Appeal deadline | Later of April 1 or 30 days after your Notice of Value (NMSA §7-38-24) |
| Where you file | County assessor → county valuation protests board → district court |
| Assessment cap | Residential value rises ~3%/yr; resets on sale/improvement (NMSA §7-36-21.2) |
| Can the board raise your value? | Low risk — the protest process reviews your value, not a request to raise it |
New Mexico also caps how fast your residential value can rise: generally about 3% a year — the higher of 103% of last year's value or 106.1% over two years (NMSA §7-36-21.2). Because of that cap, your value may already sit below what your home would sell for, in which case a comparable-sales win mainly protects your future baseline. But the cap resets to full market value the year after you buy the home or make significant improvements — so a recent buyer gets the full benefit of a lower value right away.
Building your case
Because the question is your home's market value, the winning evidence is recent, nearby comparable sales — homes like yours in size, age, and condition — not listing prices or online estimates. Three or four solid comps with clear adjustments carry far more weight than a complaint that the number "feels high."
New Mexico is relatively low-risk to appeal: the protest process reviews the county's value against your evidence rather than inviting the board to hike an ordinary home. Still, bring your strongest, cleanest set and file only when your comps clearly support a lower value.
Filing at the county level
Every New Mexico county runs its own assessor and valuation protests board, and the mechanics — where to file your protest, the informal-review process, and Notice-of-Value mailing dates — vary across all 33 counties. We're building out county-specific guides with the filing office and local calendar for each. In the meantime, use PROppeal to pull licensed comparable sales for your address and confirm your protest deadline on your Notice of Value.
Get your case built
You don't need to wait on a county-specific guide to start. PROppeal pulls licensed comparable sales for your address, works from your home's full market value (not the 33⅓% taxable figure), factors in whether the 3% cap changes your savings, and gives you a straight answer on whether your assessment is out of line — within your 30-day protest window.
Sources
- NM Const. Art. VIII §1 — taxable value limited to 33⅓% of market value
- NMSA §7-36-15 — valuation of property for property taxation
- NMSA §7-36-21.2 — limitation on annual increases in residential property valuation (~3%)
- NMSA §7-38-24 — protest of value; deadline (later of April 1 or 30 days after the Notice of Value)
Property tax rules and deadlines vary by jurisdiction and can change — verify with your county before relying on this.
See if your New Mexico assessment is too high
PROppeal checks your case against real, recent comparable sales and gives you an honest verdict — then builds the board-ready letter to file, all in one price.
Check your case