Deadline
California Filing Opens July 2 and the Closing Date Varies by County
In California, the regular assessment appeal filing period opens July 2, 2026. The closing date depends on your county: it is September 15 in counties that mailed assessment notices to all property owners by August 1, and November 30 in counties that did not. Los Angeles County’s window runs July 2 through November 30, 2026. Confirm your county’s exact closing date with the county Clerk of the Board before you file. If you want help preparing evidence and filing in time, the address lookup is the fastest first step.
Start With the Parcel
The county assessment roll is where the assessed value, owner details, and property facts usually begin. Homespring uses the address step to orient the case before asking for more homeowner effort.
Evidence Matters More Than Frustration
A strong appeal usually depends on comparable sales, parcel detail accuracy, and any specific condition issues that affect value as of the lien date.
County Rules Still Control
Homespring can help homeowners organize the process, but the county roll, the board’s filing steps, and the property’s facts still drive the outcome.
How California Assessment Appeals Work
- Confirm the parcel facts and the assessed value on the county roll first.
- File an Assessment Appeal Application (BOE-305-AH) with the county Assessment Appeals Board through the Clerk of the Board during the filing window that opens July 2.
- Gather comparable sales and evidence that speak to the property’s market value as of the January 1 lien date.
- If you disagree with the board’s decision, you can challenge it in the county Superior Court within six months.
Where to File and Where to Appeal Next
California assessment appeals are filed with the county Assessment Appeals Board through the Clerk of the Board, using the state’s Assessment Appeal Application (form BOE-305-AH). The board reviews the assessor’s value against the evidence and can lower, raise, or confirm it. If you disagree with the board’s decision, the next step is the county Superior Court. Homeowners can always file on their own for free; Homespring is for those who would rather have the comparable sales, evidence, and hearing handled for them.
- California State Board of Equalization for statewide assessment appeal rules and the county-by-county filing deadlines.
- Los Angeles County Board of Supervisors for a live county example of filing and process detail.
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