New Mexico homeowners pay a median of $1,731 a year in property tax, an effective rate of 0.70%, the 35th highest of the 51 states we cover. The deadline to appeal: 30 days after notice (county assessor). Here is who sets your value, how to challenge it and what evidence works.
Closed for 2026Closed. 2026 protest deadlines passed in spring (30 days after each county mailed notices; May 1, 2026 in Bernalillo County). The next window opens when 2027 notices of value go out, by about April 1, 2027. If you did not protest, you can still pay your 2026 taxes and file a claim for refund in district court, generally by early January 2027 (Bernalillo says January 10).
File a protest petition with the county assessor within 30 days after the assessor mailed your Notice of Value (the law says on or before the later of April 1 or 30 days after mailing). Because counties mail notices on different dates, check the mailing date on your own notice. Example: Bernalillo County (Albuquerque) mailed 2026 notices on April 1, 2026, and the last day to protest was Friday, May 1, 2026, online or in person. Santa Fe County's 2026 deadline was June 1, 2026. If you miss the protest deadline, you can still pay your taxes and file a claim for refund in district court within 60 days after the first-half tax payment is due (Bernalillo County says generally by January 10 of the next year).
By April 1 each year, the county assessor mails a Notice of Value (NOV) showing your home's full value, taxable value, exemptions and net taxable value. Not receiving the notice does not cancel the value. Some counties mail later; for example, Santa Fe County's 2026 protest deadline was June 1.
Where you file depends on your county. Pick yours for the office contacts, local tax figures and a step-by-step guide.
Enter the market value on your assessment notice and what you think the home would really sell for. We estimate the yearly saving if the board agrees with you.
Some states cap how fast the taxable value of a home can rise (California, Florida, Michigan and Texas homesteads, for example). If your taxable value is already held below market value by a cap, a lower market value may not lower this year's bill.
An elected county assessor values homes in each of New Mexico's 33 counties. Protests go to the county valuation protests board, a three-member board in each county: two county residents appointed by the county commission and a property appraisal officer from the state Taxation and Revenue Department's Property Tax Division, who chairs it. Homes are valued at market value as of January 1. Your taxable value is one-third (33 1/3%) of that full value, minus any exemptions (for example the $2,000 head of family exemption). For a home that did not sell, 'current and correct' value means its market value in the prior year (counties on a one-year cycle) or in the last odd-numbered year (counties on a two-year cycle). Assessors reappraise either every year or every two years, as approved by the state. For most homes the value cannot rise more than 3% a year (or 6.1% over two years). The cap does not apply in the year after a sale, after new improvements, or after a change in use or zoning; then the home is revalued at full market value.
After you file, the assessor's staff usually reviews your property, sometimes with a site visit, and may hold an informal conference with you before the hearing. The conference is off the record and works like settlement talks. If you agree to a new value, you sign a withdrawal and no hearing is held. You can also call the assessor before the deadline to fix record errors, but a phone call does not protect your rights; file the petition on time.
What works in New Mexico: Sales of similar nearby homes from the right market year (Bernalillo asked for 2025 sales for 2026 values; Santa Fe asked for 2024 sales); An appraisal of your home as of that market year; Errors on the property record: square footage, condition, quality, features; Photos and repair estimates for damage or defects; Proof that the 3% cap was applied wrong (no sale, no new improvements, no change of use last year); Records the assessor used to value your home, which you can request before the hearing.
File a petition of protest with your county assessor (not the board). Each county has its own form; most accept it by mail or in person, and some, like Bernalillo, online. The petition must give your name and address, the property, why the value is wrong, the value you think is right, and the part of the value you do not dispute. The assessor schedules a hearing and mails notice by certified mail at least 15 days ahead. Give the assessor copies of your evidence in advance and bring five copies to the hearing. Hearings are recorded and testimony is under oath. If you do not show up without a good reason, the protest is denied. The board must issue a written order within 30 days after the hearing, and every protest must be decided within 180 days of filing. Cost: No fee to file a protest. Some counties charge for copies (Santa Fe: 50 cents a page if they copy your evidence).
The assessor's value is presumed correct (Section 7-38-6). You must come forward with evidence showing the value is wrong. If you do, the burden shifts to the assessor to show the value is correct. Your purchase price alone is not enough if sales of comparable homes show the price was not market value.
Within 30 days after the date of the board's written order. File a notice of appeal in the district court for the county where the hearing was held, under Section 39-3-1.1 and Rule 1-074; the county assessor is named as appellee. The court reviews the record made at the board hearing, so all your evidence must be presented to the board. You pay the cost of preparing the record plus court filing fees. A lawyer is strongly recommended.
The board's order tells the assessor to change the valuation records, and your tax bill for that year uses the new value. If you won a claim for refund in court, the county refunds the overpaid tax. Values are set again each year, so check your notice next spring.
The state constitution requires equal and uniform taxes, and assessors must use the same or similar methods for similar property, so you can point to unequal treatment. But the 3% cap means neighbors' values legally differ depending on when homes last sold, and boards decide market value, so comparable sales are stronger evidence. This works only in limited cases. Run the numbers with our unequal assessment calculator.
Most wins start with a mistake in the assessor's record of your home. Check it line by line.
Record card checklistAn exemption is separate from an appeal: you apply once and it cuts your taxable value every year. Check you have every one you qualify for.
Reduces taxable value by $2,000 for a New Mexico resident who is married, widowed, supports a related person, or is single. One per household and one property. Claim once with the county assessor; it continues.
Freezes the taxable value of the home you live in if you are 65 or older or disabled and your modified gross income is under the limit (Bernalillo lists $44,200 for 2026). Apply with the county assessor within 30 days after the notice of value.
Veterans (and unremarried surviving spouses) can take up to $10,000 off taxable value; Bernalillo County asks for a certificate from NM Veterans Services. Disabled veterans can get an exemption on their primary home based on their VA disability rating (confirm the statewide rule; the details were taken from Bernalillo County's page).
You can protest on your own. Someone else, such as an agent or appraiser, can file and appear for you if a signed letter of authorization from the owner is attached to the petition. Appeals to district court follow court rules, and a lawyer is advisable.
Fill in your details and download a written appeal statement as a PDF or Word file. Most boards also require their own appeal form: file the form and attach this letter and your evidence to it.
Tax Appeal Map is a free information site, not a law firm or appraiser. The letter is a template, not legal advice.
File a protest petition with the county assessor within 30 days after the assessor mailed your Notice of Value (the law says on or before the later of April 1 or 30 days after mailing). Because counties mail notices on different dates, check the mailing date on your own notice. Example: Bernalillo County (Albuquerque) mailed 2026 notices on April 1, 2026, and the last day to protest was Friday, May 1, 2026, online or in person. Santa Fe County's 2026 deadline was June 1, 2026. If you miss the protest deadline, you can still pay your taxes and file a claim for refund in district court within 60 days after the first-half tax payment is due (Bernalillo County says generally by January 10 of the next year).
With the County Valuation Protests Board protest. File a petition of protest with your county assessor (not the board). Each county has its own form; most accept it by mail or in person, and some, like Bernalillo, online. The petition must give your name and address, the property, why the value is wrong, the value you think is right, and the part of the value you do not dispute. The assessor schedules a hearing and mails notice by certified mail at least 15 days ahead. Give the assessor copies of your evidence in advance and bring five copies to the hearing. Hearings are recorded and testimony is under oath. If you do not show up without a good reason, the protest is denied. The board must issue a written order within 30 days after the hearing, and every protest must be decided within 180 days of filing.
No fee to file a protest. Some counties charge for copies (Santa Fe: 50 cents a page if they copy your evidence).
After you file, the assessor's staff usually reviews your property, sometimes with a site visit, and may hold an informal conference with you before the hearing. The conference is off the record and works like settlement talks. If you agree to a new value, you sign a withdrawal and no hearing is held. You can also call the assessor before the deadline to fix record errors, but a phone call does not protect your rights; file the petition on time.
You can appeal to the District court appeal (Rule 1-074). Within 30 days after the date of the board's written order. File a notice of appeal in the district court for the county where the hearing was held, under Section 39-3-1.1 and Rule 1-074; the county assessor is named as appellee. The court reviews the record made at the board hearing, so all your evidence must be presented to the board. You pay the cost of preparing the record plus court filing fees. A lawyer is strongly recommended.
The board's order tells the assessor to change the valuation records, and your tax bill for that year uses the new value. If you won a claim for refund in court, the county refunds the overpaid tax. Values are set again each year, so check your notice next spring.
Checked 2026-10 against official New Mexico sources. Local deadlines and fees can differ; confirm with your assessor or board.