S Corp Deadline 2024. — for instance, in 2024, sole proprietors and c corporations operating on a calendar year must file by april 15, while s corporations and partnerships have a march. If the tax year is 2.5 months or less, the deadline is prior to the 15th day.
— the s corporation election deadline for llcs and c corporations is march 15, 2024. If the tax year is 2.5 months or less, the deadline is prior to the 15th day.
