Contra Costa County Property Tax Filing Guide
County:Contra Costa
Filing Fee:$40
Status:
Next Deadline:
Notice of Value Released August 1, 2026
3 Steps to File Your Protest
Follow this proven process to successfully challenge your Contra Costa County property assessment
1
Gather Your Evidence
Collect comprehensive documentation that proves your property is overassessed compared to similar properties in your area.
2
Mail Your Petition
Complete your BOE-305-AH petition form, include a $40 check payable to Contra Costa County, and mail to the Contra Costa County Value Adjustment Board before the November 30, 2026 deadline.
3
Attend Your Hearing
Present your case professionally to the Assessment Appeals Board at your scheduled hearing date and time (hearings begin in your county in TBD).
Complete Filing Guide
Follow these detailed steps to successfully file your property tax protest with Contra Costa County. Each step includes specific requirements and deadlines you must meet.
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