End Of Fiscal Year 2024 Deadline. The fiscal year may differ from the calendar year, which ends dec. If a due date falls on a saturday, sunday, or legal holiday, the due date is delayed until the next.

January 18, 2024 at 6:00 a.m. If your corporation operates on a fiscal year basis (e.g., a july 1 to june 30 tax year), form 1120 is generally due by the 15th day of the fourth month after the end.