California Property Tax Appeal Deadlines for 2026

For a regular 2026 California property tax assessment appeal, the filing period opens July 2, 2026. Your deadline is either September 15, 2026, or November 30, 2026, depending on your county.

The California State Board of Equalization (BOE) published these county deadlines in Letter to Assessors 2026/023. The table below covers regular assessment appeals only. Supplemental and escape assessment appeals have different filing periods.

September 15, 2026 Deadline

File by September 15, 2026, if your property is in one of these counties:

November 30, 2026 Deadline

File by November 30, 2026, if your property is in one of these counties:

What Determines Your County’s Deadline?

Under the BOE’s 2026 letter, counties that mail assessment notices to all secured-roll taxpayers by August 1 have a September 15 deadline. The remaining counties have a November 30 deadline.

Before You File

• Confirm that you are filing a regular assessment appeal and that the county and tax year are correct.
• Check your county clerk or assessment appeals board for its application form, filing method, and any fee.
• Keep proof that you filed by the deadline. Paying your property-tax bill remains required while an appeal is pending.

For the complete state notice and county table, see BOE Letter to Assessors 2026/023.