If your return has been transmitted and accepted by the IRS, you will have to amend your Federal 1040 tax return.
If you used TurboTax Online, log in to your account and select Amend a return that was filed and accepted.
If you used the CD/download product, sign back into your return and select Amend a filed return.
Be sure to only make changes to the areas of your return that need amending. The refund calculator will start new at $0 and only reflect the changes in the refund or tax due.
See also this TurboTax Help.
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