Los Alamos County property tax appeal 2027: deadline, forms and how to file
To appeal a Los Alamos County assessment, file with the Los Alamos County Valuation Protests Board; in New Mexico the deadline is 30 days after the notice of valuation is mailed. Confirm the exact date on your notice or with the assessor; we add each county's 2027 date here when it is published.
Data as of 20 Oct 2026 · the Los Alamos County assessorCheck your own assessment
Free. We compare the value on your notice with recent sales of similar homes nearby and tell you whether an appeal is worth filing. Have your assessment notice and tax bill handy.
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How to file in Los Alamos County
- Step 1
File the appeal
Use the method your notice lists, by the deadline on the notice.
- Step 2 · before the hearing
Prepare and submit your evidence
Comparable assessed values, photographs of condition issues and recent sales where they are public. Ask the appraisal office for the evidence it will use.
- Step 3
Meet, then hear
An informal review usually comes before a formal hearing; most reductions happen at the informal stage.
Before you file: how to read your notice · evidence that works · informal vs formal hearing · when not to appeal
Los Alamos County questions
Data as of 20 Oct 2026 · New Mexico statutesWhen is the property tax appeal deadline in Los Alamos County?
New Mexico law sets it: Petition filed with the county assessor within 30 days after the notice of valuation is mailed; if the notice came with the prior year’s tax bill, the later of April 1 or 30 days (NMSA 7-38-24(A)(1), as amended by Laws 2026, ch. 9). Confirm the exact date on your notice or with the assessor.
Who hears a appeal in Los Alamos County?
The Los Alamos County Valuation Protests Board hears the first appeal. Filing rules: NMSA 7-38-24.
What value should I compare on my New Mexico notice?
The figure labeled “Full Value”. New Mexico appeals are argued against market value as of January 1 of the tax year (NMSA 7-38-7).
Does New Mexico cap assessment increases?
Residential value may rise no more than 3% a year (6.1% over two years); the limit lifts after a sale, new improvements or a change of use (NMSA 7-36-21.2). A separate freeze applies to qualifying owners 65+ or disabled (7-36-21.3).
Check whether yours is over-assessed
Nearby counties
Santa Fe County · Sandoval County · Rio Arriba County · Bernalillo County · Taos County · Mora County · Valencia County
- NMSA 1978 ch. 7 index (NMOneSource)
- NMSA 1978 ch. 7 full text (7-36-15, 7-36-21.2, 7-37-3, 7-38-7, 7-38-12.1, 7-38-20, 7-38-21, 7-38-24)
- Bernalillo County Assessor, residential property owners (2026)
- Bernalillo County Assessor, protest process
- U.S. Census Bureau, county population estimates (2024) and county gazetteer (2024).