What is the due date of the IL-1120?

What is the due date of the IL-1120?

Corporations must file Form IL-1120, Illinois Corporation Income and Replacement Tax Return, annually by the 15th day of the 3rd month following the close of the taxable year. We grant you an automatic seven-month extension of time to file your corporate tax return. You are not required to file Form IL-505-B, Automatic Extension Payment, in order to obtain this automatic extension. However, if you expect tax to be due, you must use Form IL-505-B to pay any tentative tax due in order to avoid interest and penalty on tax not paid by the original due date of the return. 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.

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