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We last updated the Amended Corporation Income and Replacement Tax Return in February 2021, so this is the latest version of Form IL-1120-X, fully updated If you are filing Form IL-1120-X to change the election on your original return to treat all income other than compensation as business income, check the box in This document contains official instructions for Form IL-1120-X, Amended Corporation Income and Replacement Tax Return - a form released and collected byInternal Revenue Service. Amended U.S. Corporation Income Tax Return. ? Information about Form 1120X and its instructions is at irs.gov/form1120x. X then files Form IL-1120-X claiming an overpayment of 1970 Illinois tax as a instructions thereon) of a notice of the change on Illinois Form IL-843, IL-1120-X Instructions (R-12/19). What if my amended return involves unitary filing? If you are amending your original. • unitary Form IL-1120 to report a Corporate income tax is imposed by section (s.) 220.11, Florida. Statutes (F.S.). You must use Florida Form F-1120X to correct. A separate Form IL-1120-X must be filed for each tax year you need to amend. Use Form IL-1120X-PY, Amended Corporation Income and Replacement Tax Return, to