2024 Tax Extension Deadline Date. Partnerships and s corporations must apply for an extension by march 15, 2024. You can extend the due date for filing your personal income tax return by six months (e.g., to october 15, 2024, for 2023 tax year returns) by filing form 4868 or.

October 15, 2024 (for calendar year corporations) for fiscal year corporations, the extension deadline is the 15th day of the tenth month. 2024 federal tax deadline for: