Technically, if you left income off of a return you've already filed, you'll need to file an amended return to report that income.
Please see the TurboTax articles "Do I need to amend?" and "How to amend (change or correct) a return you already filed" for additional information.
The IRS also has a good tool that can help you determine if you should file an amended return to correct an error. Please see "Should I File an Amended Return?" to use this tool.
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