Tax Return Due Date 2025 Extension. If you’re a calendar year filer, april 15, 2025, is also the deadline to file your c corporation’s federal tax return for 2023 or to file for an extension to file your corporate tax return. The due date to file itr for ay 2025.

This gives you until october 15 to file without penalties. A calendar year personal income taxpayer who has never filed a return in massachusetts submits an amnesty request for tax years 2021, 2022, and.