///CALIFORNIA · COUNTY GUIDE
The Fiscal Year 2025-2026 deadline to appeal a San Diego County property tax assessment is November 30, 2026. The filing window runs from July 2, 2026 to November 30, 2026.
For the regular property tax assessment appeal period, San Diego County states that individuals and businesses seeking to appeal their property tax assessments for Fiscal Year 2025-2026 may do so between July 2, 2026 and November 30, 2026.
| Fiscal Year 2025-2026 appeal deadline | November 30, 2026 |
|---|---|
| Filing window opens | July 2, 2026 |
| File with | Clerk of the Board of Supervisors, Assessment Appeals, 1600 Pacific Highway, Room 402, San Diego, CA 92101-2471 |
| Governing jurisdiction | San Diego County Clerk of the Board of Supervisors / Assessment Appeals Board |
| After a successful appeal | A Proposition 8 decline-in-value reduction is reviewed every year and holds while the market supports it. |
| Can a board raise the value? | Yes — see below (Cal. Rev. & Tax. Code §1610.8) |
| Deadline source | Property Tax Assessment Appeals |
| Last verified | August 16, 2026 |
The Fiscal Year 2025-2026 deadline is November 30, 2026. The window opens July 2, 2026. For the regular property tax assessment appeal period, San Diego County states that individuals and businesses seeking to appeal their property tax assessments for Fiscal Year 2025-2026 may do so between July 2, 2026 and November 30, 2026.
Appeals are filed with the Clerk of the Board of Supervisors, Assessment Appeals, 1600 Pacific Highway, Room 402, San Diego, CA 92101-2471. The governing jurisdiction is the San Diego County Clerk of the Board of Supervisors / Assessment Appeals Board.
California assessments start from a Proposition 13 base-year value that rises about 2% a year. Proposition 8 requires the assessor to enroll the lower of that factored base value or the property's current market value, so when the market falls below the roll, a decline-in-value appeal applies. Several counties offer an informal review with the assessor first; formal appeals go to the county Assessment Appeals Board, and a Prop 8 reduction is reviewed every year, holding while the market supports it.
It's possible — a California Assessment Appeals Board equalizes the roll by reducing or increasing an assessment (Cal. Rev. & Tax. Code §1610.8), and the Proposition 13 ceiling protects decline-in-value appeals, not base-year disputes. That's why we check for that exposure before filing: we don't file when we see it, and if it surfaces after filing we withdraw.
Last verified August 16, 2026.
Enter your address and we'll check San Diego County's own records at no cost. If there's no case, we'll tell you that too.
Serving greater Los Angeles.
California property tax appeals. Any estimate is based on county assessment data and public records and is not a guarantee of any outcome. Representation and fee terms are provided in writing before any filing. Deadline information reflects published county materials as of the date shown above — verify with the Clerk of the Board of Supervisors, Assessment Appeals, 1600 Pacific Highway, Room 402, San Diego, CA 92101-2471 before relying on it.