when are corporate tax returns due extension
Corporate Due Dates Corporate Returns For taxable years beginning on or before January 1, 2016, corporate income tax returns are due on or before the 15 th day of the 3 rd month following the close of the taxable year with the exception of an extension. For tax years beginning on or after January 1, 2016, C corporation returns are due on or before the 15th day of the fourth month following the close of the taxable year (note the S Corporation return due date has not changed).