Tax Deadline 2024 San Diego California. 15 falls on a sunday.  — residents of san diego county have until june 17, 2024 to file their taxes in lieu of april 15 after the irs offered tax relief following the january floods.

 — according to the irs, the june 17 deadline will now apply in san diego county for:  — irs postpones various tax filing and tax payment deadlines for storm and flooding victims in san diego county in california.