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

Treasury
Tax
Revenue & Recovery

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Important Dates
03 Jul
Informal Value Review Filing Period Begins
July 3, 2025
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, 2025
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.
01 Aug
Unsecured Tax Bills are Mailed on or before August 1
August 1, 2025
Unsecured tax bills reflect the lien date value.