You can't open a .tax file because it contains data that only the TurboTax program can open. You can save your income tax return as a PDF and open it in Google. Saving a copy of your return as a PDF (in addition to the proprietary tax data format TurboTax uses) lets you open, view, and print your return using the free Adobe Reader or Foxit Reader software.
To save your tax return as a PDF, see the Related Information below.
For additional information, click on What's the difference between the tax data file and the PDF file?
Related Information:
[Edited 3-10-2020|8:24 am PST]