You'll have to do this on a computer or laptop, as it involves installing the TurboTax download software. You won't be able to do this on a mobile device.
- Sign in at TurboTax.com with the login you used when you filed your 2016 return.
- Select Show to open Your tax returns & documents.
- Select 2016, and then select Amend (change) 2016 return.
- In the expanded instructions, select the links in step 1 (download your .tax file) and step 2 (download TurboTax Desktop 2016 for Windows).
- Using a Mac? Complete this online form to request the 2016 TurboTax Amendment software for the Mac.
- Install the TurboTax Desktop 2016 software. Win instructions | Mac instructions
- Now, open your .tax file in the TurboTax Desktop 2016 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.
- Finally, you are ready to amend your 2016 return. Follow the instructions in this FAQ.