Tax Deadline 2024 California Extended Tax. You must send payment for taxes in california for the fiscal year 2024 by march 15, 2025. California tax extension 2024 deadline.

Individuals whose tax returns and payments are due on april 18, 2023. Individuals and businesses with their principal residence or place of business in san diego county will have until june 17, 2024, to file certain california individual and business tax.