You won't be able to amend your return in TurboTax Online or on a mobile device. You'll have to install the TurboTax download software on your computer.

1. Sign in at TurboTax.com with the user ID you used when you filed your 2017 return.
2. Select Show next to Your tax returns & documents.
3. Select Download .tax fIle. You'll need this to amend your return.
   • If you don't have access to your tax return, you'll need to pay for access before you can download your .tax file.
4. Once you've got your .tax file, select 2017, and then select Amend (change) 2017 return.
5. In the expanded instructions, select download TurboTax Desktop 2017.
6. Install the TurboTax 2017 software.
   • Windows instructions
   • Mac instructions
7. Now open your .tax file in the TurboTax 2017 software by choosing File > Open Tax Return (Windows) or TurboTax > Open Tax Return (Mac). Browse to the location of your tax file, and then select Open.
8. You're ready to amend your 2017 return. Follow the instructions in this FAQ.