Business Tax Return Extension Deadline 2024. For september 2024, it is essential to adhere to specific deadlines set by the income tax authorities to ensure effective tax planning and avoid any penalties. C corporations and sole proprietors using a calendar year:
Taxpayers who have missed the july 31 deadline can file a belated return on or before december 31, 2024. So, for example, if your business’ tax year began on january 1st, 2023, and you wanted to be taxed as an s corporation when you file your return for that year in 2024, you must have submitted your 2553 no later than march 15, 2023.