About Form 1120-X, Amended U.S. Corporation Income Tax Return

Corporations use this form to:

  • correct a Form 1120 (or Form 1120-A, if applicable) as originally filed, or as later adjusted by an amended return, a claim for refund, or an examination,  or 
  • make certain elections after the prescribed deadline.

Current Revision


Recent Developments


Other Items You May Find Useful

All Revisions for Form 1120-X

About Form 1139, Corporation Application for Tentative Refund

About Form 3115, Application for Change in Accounting Method

About Form 4466, Corporation Application for Quick Refund of Overpayment of Estimated Tax

About Publication 542, Corporations

Other Current Products