Tax Extension Deadline 2024 For S Corporation. This tax extension gives you breathing room if you’re behind on your paperwork, but remember, it’s an extension to file, not an extension to pay what you. For calendar year s corporations, that translates to a march 15,.

Once you file for a tax extension, your new updated deadlines will be: Partnership income (form 1065) and s corporation income (form 1120s) taxes are due september 16, 2024.