The median New Mexico property tax bill for an owner-occupant is $1,731 a year on a home worth $248,100, a ratio of 0.70 percent, according to the Census Bureau’s 2024 five-year survey. County ratios run from 0.29 percent in Taos County to 0.90 percent in Bernalillo County, home to Albuquerque, with one distorted exception in McKinley County explained below. This calculator applies your county’s ratio of median bill to median home value to the figure you type and sets the result beside the typical local bill. Enter market value, meaning a realistic sale price or the full value on your assessor’s notice, not the net taxable value, which is only about a third of it.
Two worked examples show the arithmetic. A $300,000 house in Bernalillo County at 0.90 percent comes to $2,700 a year, or $225 a month, which is $71 more than the $2,629 median bill there. A $250,000 house in Doña Ana County, which includes Las Cruces, at 0.67 percent produces $1,675 a year, $139.58 a month, and $195 above the county’s $1,480 median. If you bought in the last year or two, read the next section before trusting either number.
New Mexico Property Tax Calculator (2027)
Pick one of New Mexico's 33 counties and type in a likely sale price to get an annual and per-month estimate based on what owner-occupants there report paying, next to the county's median bill. Built on the Census Bureau's ACS 2024 five-year survey.
An estimate, not a tax bill. It applies the county's ratio of median real estate tax paid to median owner-occupied value (Census ACS 2024 five-year) to the value you enter. Because New Mexico caps yearly growth in a home's assessed value at 3% until it sells, that ratio mostly reflects long-held homes; a buyer's first bill after purchase is figured on full market value and often lands well above it. The Census median bill only counts owners who pay something, while median value counts every owner, so where many homes sit on untaxed tribal trust land (McKinley above all) the ratio overstates a normal bill. Not modeled: the $2,000 head of family exemption, the veteran exemption ($10,000 of taxable value from 2025, indexed after), the disabled veteran exemption, the senior or disabled valuation freeze, and special assessments. Ask the county assessor about value and exemptions and the county treasurer about the amount due.
The 3 Percent Cap, and Why It Ends When a House Sells
New Mexico values property as of January 1 every year, but a residential assessment may not climb more than 3 percent a year while the same owner holds it. The limit has been in place since 2001 and covers only residential property. It lifts when the home sells, when it is improved (solar installations excepted), or when its use or zoning changes; at that point the assessor resets it to current market value. Buyers must also hand the assessor a sale price affidavit, so the county knows exactly what you paid.
The reset, often called tax lightning, opens a wide gap. A 2024 Legislative Finance Committee brief found that an owner of average tenure, about 13 years, carries an assessed value 25 percent below a new buyer’s for an identical house, with the gap reaching 42 percent in Sierra County and 11 percent in Roosevelt County. In its example, two neighbors with matching $385,000 homes differ by $1,946 a year because one bought in 2000 and is assessed at $213,300.
From Market Value to Mills Under Yield Control
The formula on a treasurer’s bill has three steps. Taxable value is one-third of the assessed value. Exemptions come off that taxable value. The remainder is multiplied by the mill levy for your tax district, where one mill is $1 per $1,000 of taxable value.
Counties, cities, school boards, colleges, hospitals, and special districts all impose mills across roughly 240 tax districts. The state constitution caps operating levies at 20 mills in total: 11.85 for counties, 7.65 for municipalities, and 0.50 for school districts. Voter-approved debt and special levies sit outside that ceiling. The state itself levies 1.36 mills for general obligation bond debt and takes no property tax for its general fund.
The final rate is not simply what local boards adopt. Under the yield control statute, section 7-37-7.1, the Department of Finance and Administration certifies every district’s rates by September 1, trimming operating mills when values grow faster than a capped inflation factor. The calculation runs separately for residential and nonresidential property, so a home and a shop in the same district carry different rates. On 2021 collections, school districts received 33 percent, counties 30 percent, municipalities 14 percent, and higher education 10 percent.
County Ratios: Taos Lowest, McKinley an Outlier
Of the 33 counties, 27 sit below the statewide 0.70 percent, Union matches it, and five exceed it; the middle county ratio is 0.55 percent. The lowest are Taos at 0.29 percent, Catron at 0.36, Rio Arriba at 0.42, and Harding at 0.44. Taos pairs a $382,800 median value with a median bill of only $1,129. Santa Fe County, at 0.48 percent, has the second highest median value, $446,300. Los Alamos posts both the largest median bill, $2,717, and the top median value, $495,800.
On a $300,000 home the spread runs from $870 in Taos to $2,700 in Bernalillo. McKinley County shows 2.00 percent, which would mean $6,000, but that ratio is an artifact. Much of the county is Navajo Nation and Zuni trust land, where homes owe no county levy. The Census median bill counts only owners who pay something, while the median value, $78,700, counts every owner, so the ratio overstates what a Gallup homeowner pays. Treat Bernalillo, at 0.90 percent, as the realistic top.
Why a Recent Buyer Pays More Than the Census Ratio
Because most owners hold capped values, county ratios describe long-tenured households. Take the 2025 rate certificate for Bernalillo County, where the Albuquerque residential district totals 48.323 mills. A $300,000 home bought recently has a taxable value of $100,000. Subtract the $2,000 head of family exemption and $98,000 remains, which at 48.323 mills produces $4,735.65, well above the $2,700 the county ratio suggests. Mills differ widely: the same year’s residential totals were 22.772 in the city of Santa Fe, 30.287 in Las Cruces, 32.076 in the town of Taos, and 34.384 in Gallup. Anyone budgeting a purchase should take one-third of the price, subtract exemptions, and apply the district’s mills per $1,000.
Head of Family, the HB 47 Veteran Increase, and the Freeze
The head of family exemption removes $2,000 from the taxable value of a primary residence owned by a New Mexico resident, one per household, under section 7-37-4. You apply once with the county assessor. The amount has not changed since 1993, so in Albuquerque it trims about $96.65 a year.
Veterans saw the biggest recent change. House Bill 47, signed March 20, 2025, carried out constitutional amendments voters passed in November 2024. The veteran exemption jumped from $4,000 to $10,000 of taxable value for tax year 2025, and from 2026 the Taxation and Revenue Department adjusts it for inflation each year. At Albuquerque’s rate, $10,000 of exemption is worth $483.23. Some sites still print the old $4,000 figure or place the increase a year later than the enrolled bill does. Starting with tax year 2026, the disabled veteran exemption, formerly limited to veterans rated 100 percent, is proportional: a veteran rated 60 percent exempts 60 percent of the home’s remaining value.
Owners 65 or older, or disabled, can freeze their home’s taxable value if household modified gross income for the prior year was under $44,200, the tax year 2026 limit, which is indexed annually. Apply within 30 days of the notice of value; after three straight approved years the freeze becomes permanent. It holds the valuation, not the bill.
Notices of Value and the 30-Day Protest
Assessors mail notices of value around April 1, listing full value and net taxable value. Owners who disagree have 30 days from the mailing date to file a protest, which goes to the County Valuation Protests Board; the state Property Tax Division places a member on every board. The second route is to pay the tax and then file a refund claim in district court by January 10 of the following year. Check that your exemptions actually appear on the notice.
November and April Installments, Penalties, and Auction
County treasurers mail bills by November 1. The first half is due November 10 and the second half April 10, and each becomes delinquent if unpaid 30 days later, after December 10 or May 10. Treasurers then add a penalty of 1 percent a month, at least $5 and no more than 5 percent, plus interest of 1 percent a month. Taxes still unpaid after three full years pass to the Property Tax Division, which must hold an auction in each county every year. New Mexico gives former owners no right of redemption after that sale, only two years to challenge it in court.
What Could Shift the Figures in 2027
New Mexico property tax estimates here follow the Census Bureau’s five-year file, released each December, and every county ratio will be recomputed from the next one. Each September the Department of Finance and Administration certifies that year’s mills; the 2026 set drives bills mailed by November 1, 2026, and the 2027 set follows a year later. Veterans should watch for the inflation-adjusted exemption amount, and seniors for the new freeze income limit. While the 3 percent cap stands, the gap between long-time owners and new buyers grows wherever prices outrun it.
Sources: US Census Bureau ACS 2024 five-year data (B25103, median real estate taxes paid, over B25077, median value of owner-occupied homes); Taxation and Revenue Department property tax pages and Important Dates calendar; Department of Finance and Administration 2025 certificates of property tax rates; Legislative Finance Committee, Property Taxes in New Mexico (May 2024); Taxation and Revenue Department legislative overview (September 2024); HB 47 (2025) enrolled text; Grant and Santa Fe county assessor pages. Value and exemption questions go to your county assessor; payment questions go to your county treasurer.