San Mateo County property tax appeals

Appeal Season is a property tax appeal co-pilot. We are live across Florida and expanding to high-tax counties like San Mateo County. We are not there yet, so we cannot check a California assessment today. Leave your email and we will tell you the day we cover San Mateo County, and nothing else.

In California, assessment appeals are filed with your county’s assessment appeals board. The regular filing period opens July 2 each year and closes on September 15 or November 30 depending on the county, per the list the State Board of Equalization publishes annually. Filing fees vary by county, and many counties also offer an informal decline in value review with the assessor.

Source: California State Board of Equalization, assessment appeals · checked 2026-07-13. We're preparing coverage here and will publish San Mateo County's own verified schedule once our review of the county's records is complete.