Tax Extension Deadline 2024. If you are a sole proprietorship or c corporation that applied for an extension from the original april 15, 2024 deadline, your income tax return is now due. If you are a c corporation that applied for an extension from the original april 15, 2024 deadline, your income tax return is now due.
The tax extension deadline is oct. Make sure you pay any tax you owe by the april filing date.