How to appeal a Marin County, CA property assessment
✓ Verified — Last verified October 24, 2026
Filing details published for Marin County. Match the notice and assessment cycle to the official instructions.
Official appeal instructionsNot tax or legal advice; confirm with your county.
Filing timing
Sources. Checked .
Where to file
Sources. Checked .
Official offices
Sources. Checked .
Marin County Assessor
Sources for these instructions
Sources. Checked .
Read the source quotations (11)
https://www.marincounty.gov/news-releases/application-period-assessment-appeals-opens-july-2
Marin County property owners who disagree with the assessed value on their 2026-27 regular property tax bill have between July 2 and November 30 to file an appeal with the Marin County Assessment Appeals Board.
Checked .
https://www.marincounty.gov/departments/finance/property-tax/tax-collector
Notice: First installment of Secured Property Tax is due November 1, 2026, and becomes delinquent after December 10.
Checked .
https://boe.ca.gov/proptaxes/calendar.htm
§ 2606 Rev. & Tax. Code February 1 Property owners Second installment real property taxes due and payable.
Checked .
https://boe.ca.gov/proptaxes/calendar.htm
§§ 2618 and 2705 Rev. & Tax. Code April 10 Property owners Second installment of taxes on the secured roll, if unpaid, is delinquent at 5:00 p.m., or close of business day, whichever is later.
Checked .
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. (Government Code §§ 6706, 6707)
Checked .
https://www.marincounty.gov/departments/finance/property-tax/tax-collector
Notice: First installment of Secured Property Tax is due November 1, 2026, and becomes delinquent after December 10. A 10% penalty applies thereafter.
Checked .
https://www.marincounty.gov/news-releases/application-period-assessment-appeals-opens-july-2
Marin County property owners who disagree with the assessed value on their 2026-27 regular property tax bill
Checked .
https://www.arcc.marincounty.gov/property-information/property-types-and-assessment/understanding-assessments
By calling 415-473-7215
Checked .
Continue with your property
Common questions
Where do I file a Marin County assessment appeal?
Marin County Assessment Appeals Board
Updated , from cited verification dates. Individual sources may have earlier checks.