Tax Return Deadline 2024 California. The deadline to file a california state tax return is april 15, 2024, which is also the deadline for federal tax returns. California grants an automatic six.

However, you must file your 2023 taxes by april 15, 2026. 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.