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A Message from the Treasurer-Tax Collector

The Treasurer-Tax Collector’s Office proudly serves the residents and taxpayers of San Joaquin County. Our mission is to ensure the safekeeping of public funds while maintaining liquidity and maximizing earnings in a conservative and prudent manner. We strive to provide the highest level of service in a professional, courteous, and efficient manner as we collect taxes and revenues critical to local government operations that benefit San Joaquin County and its citizens.

To better serve you, please use our chatbot located in the lower-right corner of the webpage. Thank you for visiting our website.


Phonxay Keokham, CPA
Treasurer-Tax Collector
San Joaquin County

Phonxay

Treasury

Providing banking and investment services to County departments, schools, and special districts, we oversee bank relationships and manage the investment pool in a prudent manner ensuring safety, liquidity, and a return on investment on public funds.
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Tax

Overseeing the property tax billing and collection process for secured and unsecured property taxes levied by California state law, we assist the public in understanding their property taxes and making payments. We also issue business licenses in unincorporated County areas.
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Revenue & Recovery

Collecting monies owed to the County and court ordered fees, fines, and restitution, we provide billing and collection services, make payment arrangements, and take appropriate legal action to make our clients and victims whole.
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Public Auction

March 11-12, 2026

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Important Dates

15 Feb

Exemption Filing Date

February 15, 2026

This is the last day to timely file for most exemption claims. For due dates that fall on a Saturday, Sunday, or holiday, documents will be considered timely if filed by the close of the next business day.

10 Apr

Secured Taxes Second Installment Delinquent Date

April 10, 2026

Last day to pay second installment of secured taxes without penalty.

07 May

Last Day to Timely File a Business Property Statement without Penalty

May 7, 2026

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