How to appeal a Lake County, CA property assessment
✓ Verified — Last verified October 25, 2026
Filing details published for Lake County. Match the notice and assessment cycle to the official instructions.
Official appeal instructionsNot tax or legal advice; confirm with your county.
Filing timing
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Where to file
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Official offices
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Lake County Assessor-Recorder
Sources for these instructions
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Read the source quotations (11)
https://www.boe.ca.gov/proptaxes/faqs/assessappeals.htm
You must file an Assessment Appeal Application, form BOE-305-AH, obtained from the clerk of the board of the county where your property is located.
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https://www.lakecountyca.gov/1153/Assessment-Appeal
Regular Assessment filing dates are July 2 through November 30th. Supplemental Assessment filing dates are within 60 days after the mailing date printed on the supplemental notice or supplemental tax bill, or the postmark date of the notice or tax bill, whichever is later.
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https://www.lakecountyca.gov/1109/Tax-Collector
The first installment of real property taxes is due November 1, 2026, and will be delinquent if not paid by December 10, 2026.
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https://www.lakecountyca.gov/1109/Tax-Collector
The second installment of real property taxes is due February 1, 2027, and will be delinquent if not paid by April 10, 2027.
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https://boe.ca.gov/proptaxes/calendar.htm
If the specified date falls on Saturday, Sunday, or a legal holiday, the action may be done on the next business day.
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https://www.lakecountyca.gov/1109/Tax-Collector
PLEASE BE AWARE THAT ALL SECURED PROPERTY TAX BILLS FOR 2026-2027 WILL BE MAILED OUT BY OCTOBER 31, 2026.
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https://www.lakecountyca.gov/316/Property-Tax
The County Assessor-Recorder is responsible for the valuation of property, business property and personal property of the local assessment tax roll.
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Continue with your property
Common questions
Where do I file a Lake County assessment appeal?
File the county's Assessment Appeal Application (BOE-305-AH) with the clerk of the board in the county where the property is located.
Updated , from cited verification dates. Individual sources may have earlier checks.