Union County, New MexicoProperty records & tax offices
Links open the listed public-office or service-provider website in a new tab. This directory does not collect payments.
Find the right property record
Use the property portal for ownership and assessed value, the collector for a bill or balance, and the map for parcel location. Have the address, owner name, or parcel number ready.
Tax bills & filing dates
These are the dates and qualifications recorded in the directory. Confirm your tax year and current deadline with the official office and your property’s notice.
- Tax bill mailing
- November 1, 2026 or earlier, under the New Mexico county-treasurer annual schedule; Union County's assessor page did not publish a separate 2026 mailing day.
- Payment deadline
- For tax year 2026, New Mexico county treasurers mail property-tax bills on or before November 1, 2026; the first-half payment is due November 10, 2026 and avoids interest and penalty if paid by December 10, 2026; the second-half payment is due April 10, 2027 and avoids additional charges if paid by May 10, 2027.
- Assessment appeal
- Within 30 days after the 2026 Notice of Value mailing; Union County typically mails Notices of Value on or before April 1, so the statutory deadline is the notice date plus 30 days.
Exemptions & appeals
View exemption application (opens in a new tab)Exemption filing
January 1 through 30 days after the 2026 Notice of Value mailing; Union County states exemptions and valuation-freeze applications filed after that period apply to the next tax year.
Senior relief
For 2026, a qualifying owner age 65 or older or disabled may apply for New Mexico's low-income valuation limitation on an owner-occupied primary single-family residence; the 2026 county forms use a $44,200 prior-year modified-gross-income limit. Applications require proof of age or disability, occupancy, and income.
Valuation limits
New Mexico NMSA 7-36-21.2 and 7-36-21.3 generally limit annual assessed-value growth for eligible residential property to 3%; statutory exceptions include new property, change of ownership, physical improvements, use or zoning changes, and eligibility changes. Qualifying low-income owners age 65 or older or disabled may receive a valuation freeze on an eligible primary single-family residence.
For a valuation appeal, use the appeal date in the tax and filing section above. Keep your notice, supporting evidence, and proof of submission.
More exemption & appeal guidance →