@wschwartz66 Are you using the Desktop program? In the Desktop program your returns are only on that computer and not stored or saved online, even if you efiled them.
You need the tax file ending in .tax2020 to transfer into 2021. You need to copy that file from the Windows computer.
To move Windows to Mac......
Your tax files end in .tax or .tax2020, tax2019, or .tax2018 etc. They should be in your Documents in a Turbo Tax folder. You should also have the pdf files of each year. Or search your computer for all files ending in .tax. Also if you haven't done it, I would open each year in the program and save it as a PDF file, go to File-Save to PDF so you don't need the program installed to view or print your return in the future like to get a mortgage or loan, etc.
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.
If you are moving to a Mac from Windows or to Windows from Mac you will need to install the right program. If you have the CD it has both windows and Mac programs on it. If you downloaded the program you might need to call in and ask for the other download. Unless you have both downloads in your account already.
To Transfer from windows See Transferring from Windows
https://ttlc.intuit.com/community/tax-data-file/help/how-do-i-transfer-last-year-s-return-into-the-t...
