Yes, you will need to add it to your 2020 return.
If you filed, it is like dropping it into a mailbox - you cannot get it back.
You'll have to wait until your return is either accepted or rejected.
If rejected, you can make any necessary changes.
If accepted, you'll need to amend your return.
To avoid unnecessary delays, do not amend until your original return has been fully processed.
You can e-file your 2020 amended federal tax return, but most states require amendments to be printed and filed by mail.
Allow 16 weeks for processing.
See this TurboTax FAQ for help with amending.
You can check the status of your amended return here, but allow 3 weeks after filing for it to show up.
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