announcement
Sign up for email notifications to receive important updates and notifications regarding online bill pay and tax dates.

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.
More About Treasury

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.
More About Tax

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.
More About Revenue & Recovery
Buildings under construction

Have a question? Ask Phonxay.

Our AI chatbot provides quick answers. Ask Phonxay in your preferred language in the lower-right hand corner.

Follow Us

Important Dates

16 May

Filing period for Senior Citizens Tax Assistance

May 16, 2026

The filing period for Senior Citizens Tax Assistance is May 16 - August 31.

03 Jul

Informal Value Review Filing Period Begins

July 3, 2026

The filing period (July 3 - September 15) for an informal review of your annual assessment begins.

03 Jul

Filing Period for a Formal Appeal of Assessed Value Begins

July 3, 2026

The filing period, with the San Joaquin County Clerk of the Board of Supervisors, for a reduction in assessed value is July 3- November 30.

Note: These dates apply specifically to San Joaquin County. If you own property in another county, check with that county’s Assessor’s office for the filing period dates.

View All Upcoming Dates Get Email Reminders