Tax Return Filing Deadline 2025 California. Individuals and businesses with their principal residence or place of business in san diego county will have until june 17, 2025, to file certain california individual and business tax. The due date to file your california state tax return and pay5any balance due is april 15, 2025.
The due date to file your california state tax return and pay5any balance due is april 15, 2025. Penalties on payroll and excise tax deposits due on or after jan.