Form 1120X, Amended U.S. Corporation Income Tax Return
Corporations use Form 1120X to amend a previously filed Form 1120 or 1120-A or to make certain elections after the prescribed deadline.
Other Items You May Find Useful:
Publication 542, Corporations
Form 1120, U.S. Corporation Income Tax Return
Form 1139, Corporation Application for Tentative Refund
Form 3115, Application for Change in Accounting Method
Form 4466, Corporation Application for Quick Refund of Overpayment of Estimated Tax
Comment on Form 1120X
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