What if I need to correct or change my IL-1120?

If you need to correct or change your return after it has been filed you must file Form IL-1120-X, Illinois Amended Corporation income and Replacement Tax Return. If you file the IL-1120-X on or before the automatic extended due date, mark the form "CORRECTED" at the top and show the changes. Any correction made may cause a recalculation of penalties and interest. For more information refer to the IL-1120-X Instructions.

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