If you do use the Online version next year you can transfer from your 2016 return that's on your computer. You will need to have the data file ending in .tax2016. You can copy that one from your old computer. In fact the .tax2016 file can be opened by both the Windows and Mac programs. They use the same data file.
Even if you use the Online version you should copy all your files from the old computer. What I would do is just copy the whole Turbo Tax folder that is under your Documents. That should be where the .tax files and pdf files are stored. Copy that folder to a flash drive or best yet is to burn it to a CD or DVD and then you will have a backup of them. Then on the new computer copy the folder (or files) from the flash drive to your Documents folder.
See this article on how to move your tax return to another computer…….
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