Tax Extension Deadline 2024 California. If you’re a calendar year filer, april 15, 2024, is also the deadline to file your c corporation’s federal tax return for 2023 or to file for an extension to file your corporate tax return. (optionally, the efileit deadline is oct.

Taxpayers affected by these storms qualify for an extension to october 16, 2023 to file individual and business tax returns and make certain tax payments. California tax extension 2024 deadline.