San Diego Taxes Due 2024.  — san diego county individuals and businesses impacted by severe storms and flooding that began on january 21, 2024, qualify for an extension to file and pay. 2024 estimated tax payments normally due on april 15, 2024.

 — affected taxpayers in san diego county have until june 17, 2024, to fulfill their tax obligations, including filing federal tax returns and making payments initially due.  — san diego county residents who have yet to file various federal individual and business tax returns still have some time to do so.