If you have already filed the return, you will not be able to make changes to it. You may have to amend it. Do not amend until you have determined if the IRS accepted or rejected the return. If accepted wait until either you have received your refund or any payment you have made to the IRS has cleared. If rejected you may go ahead and make the needed changes (do not amend).
Do I need to amend?
How do I amend my 2019 TurboTax Online return?
If you have not filed your return, you can make changes:
Log in to your TurboTax Online Account
From the Overview page
Click on My TurboTax
My Tax Timeline
In the Some things you can do area
Select Add a state
This will let you back into your Return to complete and File it.
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