What you need to do is file an Amended return. First, before you create and file an amended return, I suggest you save a back up copy of your return, exactly as you filed it. To do so, just open your return, click on File, Save As, and When you first start the TurbTax Business program, there is an option just below the list of files you can choose to "continue where you left off" - Amend a Tax Return. Click on that to amend your 1120.
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