Can I amend my 2018 tax return in TurboTax?
If you used TurboTax Online, simply log in to your account and select “Amend a return that was filed and accepted.” If you used our CD/download product, sign back into your return and select “Amend a filed return.” You must file a separate Form 1040-X for each tax return you are amending.
You must mail in a 2018 amended return.
You can also manually file a 2018 amended return.
1040X form
1040X instructions
