Tax Deadline 2024 San Diego California. The california tax deadline extension covers tax filing and payment deadlines initially falling between january 21, 2024, and june 17, 2024. Quarterly payroll and excise tax returns normally due on jan.
2024 estimated tax payments normally due on april 15, 2024. Affected individuals and businesses in san diego county now have until june 17 to file their tax returns and pay federal and state taxes due between january 21 through june 17, 2024.