How to appeal a Stanislaus County, CA property assessment
✓ Verified — Last verified October 24, 2026
Filing details published for Stanislaus 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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Officially published
Official offices
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Stanislaus County Assessor
Sources for these instructions
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Read the source quotations (17)
https://www.stancounty.com/board/aab/
Between July 2, 2026 to November 30, 2026 No later than 60 days after postmark or the mailing date printed on the tax bill, whichever is later.
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https://www.stancounty.com/board/aab/
CLERK OF THE BOARD OF SUPERVISORS 1010 10th Street, Suite 6700 Modesto, CA 95354
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https://boe.ca.gov/proptaxes/calendar.htm
§ 2605 Rev. & Tax. Code November 1 First installment of real property taxes and all taxes on personal property on the secured roll are due and payable.
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https://boe.ca.gov/proptaxes/calendar.htm
§ 2605 Rev. & Tax. Code November 1 First installment of real property taxes and all taxes on personal property on the secured roll are due and payable. If the specified date falls on Saturday, Sunday, or a legal holiday, the action may be done on the next business day. (Government Code §§ 6706, 6707)
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https://www.boe.ca.gov/proptaxes/calendar.htm
§§ 2617 and 2704 Rev. & Tax. Code December 10 Property owners First installment of taxes on the secured roll, if unpaid, is delinquent at 5:00 p.m. or close of business day, whichever is later.
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https://www.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. (Government Code §§ 6706, 6707)
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https://boe.ca.gov/proptaxes/calendar.htm
§ 2606 Rev. & Tax. Code February 1 Second installment real property taxes due and payable.
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https://boe.ca.gov/proptaxes/calendar.htm
§§ 2617 and 2704 Rev. & Tax. Code December 10 First installment of taxes on the secured roll, if unpaid, is delinquent at 5:00 p.m. or close of business day, whichever is later.
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https://www.stancounty.com/tr-tax/faq.shtm
1st installment penalty = 10% of the 1st installment amount 2nd installment penalty = 10% of the 2nd installment amount plus $10.00
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https://www.stancounty.com/assessor/index-contents.shtm
On June 30, 2026, the Assessor announced the 2026-2027 $76.38 Billion annual Property Assessment Roll
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https://www.stancounty.com/assessor/Exemptions.shtm
1010 10th Street, Ste. 2400 Modesto, CA 95354
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Continue with your property
Common questions
Where do I file a Stanislaus County assessment appeal?
Clerk of the Board of Supervisors, 1010 10th Street, Suite 6700, Modesto, CA 95354.
Updated , from cited verification dates. Individual sources may have earlier checks.