How to appeal a San Mateo County, CA property assessment
✓ Verified — Last verified October 24, 2026
Filing details published for San Mateo County. Match the notice and assessment cycle to the official instructions.
Official appeal instructionsNot tax or legal advice; confirm with your county.
Filing timing
Where to file
San Mateo County Assessment Appeals Board, 500 County Center, 5th Floor, BOS 104, Redwood City, CA 94063
Official source. Verified .
Official offices
San Mateo County Assessor Division
Sources for these instructions
https://smcacre.gov/assessor/property-tax-relief
The AAB’s filing deadline schedule for 2026 assessment appeals for regular assessment is from July 2, 2026 through November 30, 2026.
Verified October 24, 2026
https://www.smcgov.org/ceo/preparing-your-appeals-application
San Mateo County Assessment Appeals Board 500 County Center, 5th Floor, BOS 104 Redwood City, CA 94063
Verified October 24, 2026
https://www.smcgov.org/ceo/preparing-your-appeals-application
Application and Instructions
Verified October 24, 2026
Continue with your property
Common questions
Where do I file a San Mateo County assessment appeal?
San Mateo County Assessment Appeals Board, 500 County Center, 5th Floor, BOS 104, Redwood City, CA 94063
Updated , from cited verification dates. Individual sources may have earlier checks.