Phonxay Keokham, San Joaquin County Treasurer-Tax Collector, has mailed personal property tax bills to approximately 13,600 business, boat, and aircraft owners in San Joaquin County as of July 26, 2019. Owners of personal property in San Joaquin County such as a boat or aircraft or have leased or owned fixtures and equipment related to a business on January 1, 2019 must pay the tax. If you do not receive a tax bill by August 1, 2019, please call the Unsecured Section in the San Joaquin County Treasurer-Tax Collector’s Office at (209) 468-2133. Failure to receive a tax bill shall not relieve the lien of taxes, nor shall it prevent the imposition of penalties.