S Corporation Tax Deadlines in California
Federal and state filing dates, extensions, and estimate schedules for 2026.
California filing deadline
Automatic extension for CA S corporations.
Due: Mar 16, 2026
Extension: Sep 15, 2026
Form: Form 100S
Estimated payments
No state estimated payment schedule listed.
Due: N/A
FAQ
Does California require S Corporation estimated payments?
Estimated payments are not typically required at the entity level, but confirm with California Franchise Tax Board.
Where can I file California S Corporation taxes?
Use California Franchise Tax Board resources at https://www.ftb.ca.gov for forms and filing instructions.