NEW MEXICO Los Alamos Property Tax Estimator
Estimate Your Property Tax
Rate Breakdown
Property taxes in Los Alamos County are calculated by multiplying the assessed value (minus exemptions) by the total local millage rate.
| Authority | Avg. Rate |
|---|---|
| County General Fund | 0.45% |
| School District (Avg) | 1.20% |
| City / Local (Avg) | 0.35% |
How Property Tax Works in Los Alamos County
Property taxes in Los Alamos County are determined by the assessed value of your property and the local tax rate, known as the millage rate. The Los Alamos County Assessor’s Office is responsible for valuing all taxable property, which is generally set at 33.33% of the property's fair market value. Once the net taxable value is established, it is multiplied by the millage rate—the total tax rate set by various taxing entities, including the county, school districts, and state government. Because New Mexico law limits annual valuation increases on residential properties to 3% (unless there are physical improvements or a change in ownership), your tax burden remains relatively predictable over time.
Available Exemptions
New Mexico offers several tax relief programs to reduce the financial burden on homeowners. These exemptions must be applied for through the County Assessor’s office, and in many cases, they require proof of residency or status.
- Head of Family Exemption: A $2,000 reduction in the taxable value of your primary residence.
- Veterans’ Exemption: Qualified honorably discharged veterans or their surviving spouses may receive a reduction in taxable value.
- Disabled Veterans’ Exemption: Veterans with a 100% service-connected disability rating are eligible for a total exemption from property taxes on their primary residence.
- Senior or Disabled Persons Valuation Freeze: Homeowners aged 65 or older, or those who are permanently disabled, may apply to freeze the valuation of their primary residence, provided they meet specific income requirements.
Payment Schedule & Deadlines
Property tax bills in Los Alamos County are mailed annually by the County Treasurer. Taxes are due in two equal installments to ensure timely funding of local services.
- First Half: Due on November 10; becomes delinquent if not paid by December 10.
- Second Half: Due on April 10 of the following year; becomes delinquent if not paid by May 10.
If payment is not received by the delinquency date, interest and penalties will accrue on the unpaid balance. It is critical to ensure your mailing address is current with the County Treasurer to avoid missing these notices. Payments can typically be made online, by mail, or in person at the County Administration building.
Appealing Your Assessment
If you believe the valuation of your property is incorrect, you have the right to file a formal protest with the Los Alamos County Assessor. Protests must be filed within 30 days of the date on your Notice of Value. When filing an appeal, it is helpful to provide evidence supporting your claim, such as recent appraisals, photographs of structural issues, or documentation of comparable property sales in your immediate neighborhood. Once filed, a meeting will be scheduled with the Assessor's staff to review your concerns. If the dispute remains unresolved, you may further appeal the decision to the County Valuation Protests Board.