When are property taxes due in Contra Costa County, California?

Contra Costa County property taxes are due December 10. A second installment is due April 10. This deadline applies to all counties in California.

What is the penalty for late property tax payment in Contra Costa County, California?

The late payment penalty in Contra Costa County is 10% + $10 fee.

How do I pay Contra Costa County, California property taxes?

You can pay Contra Costa County property taxes via Online, mail, in-person.

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Contra Costa County Property Tax Due Date

Name: Treasurer-Tax Collector
Address: 625 Court St, Room 100, Martinez, CA, 94553, US
Telephone: (925) 608-9500

California

(925) 608-9500

2026 Property Tax Due Dates

Official Source

Installment 1

December 10

First installment

Installment 2

April 10

Second installment

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Penalty: 10% + $10 feeGrace period: None

Payment Methods

Online, Mail, In-Person

Contra Costa County Treasurer

Phone

(925) 608-9500

Office Address

625 Court St, Room 100
Martinez, CA 94553

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Office Hours

Mon-Fri 8am - 5pm

How to Pay

Online

Pay using credit card or e-check

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By Mail

Mail check payable to Contra Costa County Treasurer

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In Person

Visit the Treasurer's office — 625 Court St, Room 100, Martinez CA 94553, Mon-Fri 8am - 5pm

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Other Counties in California

Alameda Alpine Amador Butte Calaveras Colusa Del Norte El Dorado

View all California counties →

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Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.