Tax Extension Deadline 2024 For Business Filing. If you’re a calendar year filer, april 15, 2024, 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. For the 2023 tax year, filed in 2024, llcs filing as sole proprietors must submit form 1040 by april 15 without an extension.

The main tax date in 2024 will be april 15th. Tax form 4868 or form 7004 must be filed by the due date of the business return.