The best way to amend your tax return is by using the same method that you used to file the original return. The amended return uses the original return as a starting point. If you amend your return using the same method you used to file it, your original return is already there. To prepare an amended return with TurboTax, you would first have to recreate your original return in TurboTax, making sure that it exactly matches the return that you filed, then amend the recreated return.
If you are amending a 2018 tax return you could use either TurboTax Online or the CD/Download TurboTax software for 2018. If you are amending a 2017 or earlier return you will have to use the CD/Download TurboTax software for the year you are amending.
After you have recreated the original tax return in TurboTax, go to the following link for instructions to amend it, as if you had filed it with TurboTax.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
An amended return has to be filed on a special form, Form 1040X. It cannot be e-filed. You have to print it, sign it, and file it by mail. It takes the IRS up to 16 weeks to process an amended return.
Don't file the amended return until your first return has been accepted and you have received the original refund.
