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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 matter. 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.

In an effort to better serve you, we welcome your comments and suggestions. Please e-mail us at and thank you for visiting our website!

Phonxay Keokham, CPA

Phonxay Keokham, CPA
Treasurer-Tax Collector
San Joaquin County



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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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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Buildings under construction

Are You Behind on Property Tax Payments?

Up to $80,000 in property tax assistance is available to all eligible homeowners. Funds do not have to be paid back and there is no cost to apply.

Apply Online

Important Dates

11 Dec

First Installment Delinquent Date

December 11, 2023

Last day to pay the first installment of annual secured taxes without penalty. If it falls on a weekend or legal holiday, the delinquent date is the next business day.

01 Jan

Lien Date for Property Taxes

January 1, 2024

Taxes are levied on both real and personal property based on its value as of 12:01 a.m. on January 1 preceding the tax year for which the taxes are levied.

01 Feb

Second Installment of Secured Taxes Due

February 1, 2024

Second installment of annual secured taxes due date. 
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