If you used the desktop version to complete your 2016 return, your tax files are saved on your computer. TurboTax does not have access to these files except when you initiate the transfer in the 2017 program. The transferred data is accomplished by accessing your tax files stored on your computer. If you no longer have your computer, then you can get a free transcript from the IRS to access your 2016 date to complete your amendment.
Get transcript
How do I amend?
If you used an online version, then simply log into your account to begin the 2016 amendment.
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