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California assessment appeal deadline in September 15 counties
- Date
- Type
- Tax deadlines
- Where it applies
- California
September 15 was the last day to file a regular 2026 assessment appeal in California counties where the assessor mailed value notices to all secured roll owners by August 1, such as Alameda, Alpine and Placer, according to the State Board of Equalization's 2026 deadline list. Counties that did not mail notices by August 1, including Orange, Riverside, Sacramento and San Diego, kept their window open to November 30.
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