When Is Tax Deadline 2025. 8, that they would accept refunds for the 2023 year starting jan. Here is a general overview of important deadlines that all business owners should mark on their calendars:

If you request an extension, ensure that you file by october 15 to avoid penalties. The federal tax filing deadline (tax day) is april 15, 2025, with an extension deadline of october 15, 2025.