IRS Form 1120X, Amended U.S. Corporation Income Tax Return - also known as the Amended Corporate Tax Return - is a form filed with the Internal Revenue Service (IRS) by corporations in order to correct mistakes made on Form 1120 (or Form 1120-A), a claim for refund, or an examination, and also, to make certain elections after the prescribed deadline. Form 1120X was issued by the IRS and last revised in 2016.
IRS Form 1120-A was the short version of the 1120 and was discontinued after the 2006 tax year. Form 1120X fillable version is available for download through the link below.
File this form at the applicable IRS Center where the corporation filed its original return.