2026 Property Tax Due Dates
November 10
First half
April 10
Second half
Payment Methods
Online, Mail, In-Person
Union County Treasurer
Phone
(575) 374-2331Mailing Address
PO Box 308, Clayton, NM 88415
Office Hours
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to Union County Treasurer — PO Box 308, Clayton, NM 88415
In Person
Visit the Treasurer's office — 200 Court Street, Clayton NM 88415, Mon-Fri 8am - 5pm
About Property Taxes in New Mexico
New Mexico property taxes are administered at the county level. Property is assessed at one-third (33.33%) of its market value — the lowest assessment ratio in the country. This means a $300,000 home has an assessed value of only $100,000 before exemptions. New Mexico's low assessment ratio combined with moderate mill rates results in effective property tax rates among the lowest in the western United States. Tax bills are mailed in the fall and due in two installments.
Payment & Assessment
New Mexico property taxes are paid in two equal installments: First half: Due November 10 Second half: Due April 10 of the following year A 1% per month penalty applies to late payments. Most counties offer online payment. Contact your county treasurer for payment options.
Statewide framework for New Mexico. Your county's specific rates and deadlines are shown above.
Other Counties in New Mexico
About Union County
Union County is the easternmost county in the U.S. state of New Mexico. As of the 2020 census, the population was 4,079, making it the fourth-least populous county in New Mexico. Its county seat is Clayton. The county was formed in 1894. Union County borders Colorado to the north, and Oklahoma and Texas to the east.
Source: Wikipedia — content available under CC BY-SA 4.0
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Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.