S Corp Tax Filing Deadline 2024 Extension. If an s corporation has successfully filed for an extension, the new due date would be the 15th day of the ninth month following the end of the corporation’s tax year. What is the filing deadline?
October 15, 2024 is the extended filing deadline for individual tax returns, sole proprietorships, and c corporations. For calendar year s corporations, that translates to a march 15, 2024, due date for.