![]() a date other than June 30, Form IL-1120 is due on or before the 15th day of the 4th month following the close of the tax year.June 30, Form IL-1120 is due on or before the 15th day of the 3rd month following the close of the tax year.Note : If you are a cooperative, Form IL-1120 is due on the 15th day of the 9th month following the close of the tax year regardless of when your tax year ends. Form IL-1120 is due on or before the 15th day of the 3rd month following the close of the tax year.You are not required to file a form to obtain this automatic extension. However, if you expect tax to be due, you must pay any tentative tax due by the original due date of the retur n to avoid interest and penalty on tax not paid. ![]() ![]() An extension of time to file your Form IL-1120 does not extend the amount of time you have to pay your Illinois tax liability. See Make a Payment for payment options.įor tax years beginning on or after Janu.
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