Yes, you can go up to the Return Manager under Tools to start a new return.
But if you have already paid for this return then the payment won't count toward the new return.
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In TurboTax Online, there must always be one active return. To start a new one, click Tools>Return Manager then Create a new return. You will then be able to delete the old one from the Return Manager if you wish.
When you entered a wrong answer, and it will ask you to upgrade, this is the way to get back, and correct.
