First half of property taxes due Dec. 10

Published on November 17, 2025

Property tax bills for 2025 were mailed to property owners by Los Alamos County’s Finance Division on November 1. The deadline for the first half of property taxes is December 10, 2025. It is the responsibility of the property owner to ensure property taxes are paid to avoid late payment penalty and interest charges.

Los Alamos County offers various methods to make it easy for payments to be made before the deadline. These methods are as follows:

-      In person. Property owners can remit payment in person at the Customer Care Center located in the lobby of the Municipal Building (1000 Central Ave., Los Alamos), or to a teller at Enterprise Bank and Trust walk-in or drive-thru windows located in Los Alamos (1200 Trinity Dr.) or White Rock (77 Rover Blvd.), by 5 p.m. on Wednesday, Dec. 10.

-      Dropbox. Property owners can drop a check or money order sealed in an envelope, in one of the two drop boxes conveniently located in the parking lot and lobby of the Municipal Building (1000 Central Ave., Los Alamos). Customer Care staff collects drop box payments each business day. To avoid penalties payments must be in the drop box by midnight, Wednesday, Dec. 10.

-      Mail. Payments can be mailed to Los Alamos County, P.O. Box 99, Los Alamos, NM 87544-0099, but must be postmarked by midnight, Wednesday, Dec. 10.

-      Online. The County Finance Division accepts tax payments online through https://eNoticesOnline.com. Payments will need to be made by 3:00 p.m. on Wednesday, Dec. 10 to meet the processing deadline. Property owners will need the County Authorization Code available on the tax bill mailed on November 1, 2025, to create an account. Instructions are available on the Customer Care website at https://ladpu.com/CCC under the Property Tax Payments tab.  

If someone else is to pay on behalf of the property owner, they will need to contact the owner directly regarding this matter. If a property owner’s property taxes are collected through an escrow account, they should verify with the appropriate organization or person to ensure that the payment is made in a timely manner. 

For  information regarding the property tax owner, name change, address correction, valuation, and more, contact the County Assessor at 662-8030 or visit the County Assessor's web page.

Questions related to tax payments may be directed to the Customer Care Center at 505-662-8333 or CustomerCare@losalamosnm.gov, or to Zhengyan Liu, Sr. Financial & Budget Analyst in the Finance Division, by email at zhengyan.liu@losalamosnm.gov or call 505-662-8076.