Contra Costa County dates and official links
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Tools for Contra Costa County, CA
Starts at the county’s Census median: $866,800. Change it to your best estimate.
Your home value × the county’s Census effective rate; your actual bill may differ.
Census survey, 2020–2024. Rate = median annual taxes ÷ median home value.
0500000US06013|7156|82|7929|114|5348|147
Official source. Last verified 2026-10-24.
A complete date-based penalty rule and its matching cutoff have not been verified here.
Check the official information
Please be aware that a 10% late-payment penalty will be assessed on the unpaid balance on the first installment. The penalty will also attach to the unpaid portion of the second installment plus a $20 cost.
Official source. Last verified 2026-10-24.
Check the exemptions that may fit. A “Yes” does not confirm eligibility; your assessor makes that decision.
Owners who occupy their principal residence on January 1.
We’ll show the next step for this exemption.
Official eligibility and application
If you own and occupy your principal place of residence on January 1, you may apply for a Homeowner's Exemption that would exempt $7,000 of your home's assessed value from taxation.
Official source. Last verified 2026-10-24.
Veterans rated 100% disabled, blind or paraplegic due to service-connected disability, or an unmarried surviving spouse.
We’ll show the next step for this exemption.
Official eligibility and application
A veteran who is rated 100% disabled, blind, or a paraplegic due to a service-connected disability incurred while in the armed forces (or the unmarried surviving spouse of such veteran) may be eligible for an exemption
Official source. Last verified 2026-10-24.
Qualifying owner-occupied principal residence on January 1; $7,000 reduction of taxable value.
We’ll show the next step for this exemption.
Official eligibility and application
The California Constitution provides a $7,000 reduction in the taxable value for a qualifying owner-occupied home. The home must have been the principal place of residence of the owner on the lien date, January 1st.
Official source. Last verified 2026-10-24.
Estimates are separate. Do not add them together; eligibility, taxing units and restrictions can overlap.
Use market value, not assessed or taxable value.
This compares market values only; being above the county median does not establish overassessment.
Census survey, 2020–2024. Rate = median annual taxes ÷ median home value.
0500000US06013|7156|82|7929|114|5348|147
Official source. Last verified 2026-10-24.
Regular appeals: July 2 through November 30 each year. Supplemental or escape assessments: within 60 days of notice.
How to file: Mail application and $40 check to Assessment Appeals Board, 1025 Escobar Street, 1st Floor, Martinez, CA 94553.
State guidance: File the county's Assessment Appeal Application (BOE-305-AH) with the clerk of the board in the county where the property is located.
Official appeal source. Last verified 2026-10-24.
Official appeal source. Last verified 2026-10-24.
Official appeal source. Last verified 2026-10-24.
Official appeal source. Last verified 2026-10-24.
Compare the same home value in up to four counties.
Starts at the county’s Census median: $866,800. Change it to your best estimate.
Enter another ZIP, city or county to compare estimated annual bills.
Not tax or legal advice; confirm with your county. How these estimates work.