Rate Breakdown

Property taxes in Doña Ana County are calculated by multiplying the assessed value (minus exemptions) by the total local millage rate.

How Property Tax Works in Doña Ana County

Property tax in Doña Ana County is calculated based on the assessed value of your property and the local tax rate, known as the millage rate. The Doña Ana County Assessor determines the property's "taxable value," which is typically one-third of the "full value" (market value) as established by appraisal. Once the taxable value is finalized, the County Treasurer applies the millage rate—a composite rate representing the combined levies of the state, county, school districts, and municipal governments. These funds are essential for financing public schools, infrastructure, emergency services, and other vital community resources.

Available Exemptions

New Mexico offers several property tax exemptions designed to reduce the financial burden on specific groups of residents. It is important to note that most exemptions require an application to be filed with the County Assessor's office:

• Head of Family Exemption: A modest reduction in the taxable value of a primary residence for New Mexico residents.
• Veterans Exemption: Available to honorably discharged veterans or their surviving spouses, providing a significant reduction in taxable value.
• 100% Disabled Veteran Exemption: A full exemption from property taxes on the primary residence for veterans who have been rated 100% service-connected disabled by the U.S. Department of Veterans Affairs.
• Senior/Disabled Low-Income Valuation Freeze: Qualifying seniors (age 65+) or permanently disabled individuals with limited income may apply to freeze the valuation of their primary residence, preventing future increases in the taxable base.

Payment Schedule & Deadlines

Property taxes in Doña Ana County are billed annually and may be paid in two equal installments. The payment timeline is as follows:

• First Half: Due November 10; becomes delinquent if not paid by December 10.
• Second Half: Due April 10; becomes delinquent if not paid by May 10.

If taxes are not paid by the delinquency dates, interest and penalty fees are applied to the outstanding balance. Continued failure to pay may result in a tax lien being placed on the property, which can eventually lead to a tax sale. To avoid penalties, ensure payments are postmarked or processed through the Treasurer’s online portal by the deadline.

Appealing Your Assessment

If you believe the valuation of your property is inaccurate or inconsistent with similar properties in Doña Ana County, you have the right to file a formal protest. Property owners must submit a written "Petition of Protest" to the County Assessor within 30 days of the date on the Notice of Value. During the protest process, you will have the opportunity to present evidence, such as recent appraisals, photographs, or documentation of structural issues, to support your claim for a valuation adjustment. If the issue is not resolved at the county level, further appeals may be directed to the County Valuation Protests Board.