Tax Extension Deadline 2024 For S Corporation. If you filed a 2023 tax extension, then your fy2023 tax return and payment, if owed, are due. If you are a c corporation that applied for an extension from the original april 15, 2024 deadline, your income tax.

Extension sep ira contribution deadlines by entity type: This is the cutoff for electing to be taxed as an s corp for the current year.