When you start a New Tax Return using the 2018 TurboTax software, the first screen shows the 2017 tax data files found in the Documents directory and in the TurboTax folder. The 2017 tax data files have a file extension of .tax2017. You select the 2017 file to transfer to the 2018 tax return. If no 2017 tax data files are found then you click on the Browse button to find the 2017 tax return to transfer to the 2018 tax return.
