You can always check to see if you did e-file your return by clicking
here: Check your e-file status
If you did transmit your return you will not be able to make any changes to
it until it is accepted or rejected by the IRS. The IRS will start
processing returns January 29.
If your return is rejected, just go back into your return to add your
information. If the IRS accepted your
return, which is unlikely, you will have to amend your return.
Please see the following FAQ for information on amending a return you already
filed:
https://ttlc.intuit.com/replies/3288565
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