What is a TT18 File Type?
When you save your tax return, TurboTax Canada 2018 automatically creates the TT18 file. It stores the status of your tax return, which allows you to close and reopen your tax return. Typically, the file is used for the following purposes:
The file extensions used by TurboTax Canada correspond to the year of the tax data they contain. Tax returns for the year 2017 use the .TT17 extension, tax returns for the year 2016 use the .TT16 extension, and so on.
TT18 files are saved by default to Windows at the following location.
Users\ [user name]\ Documents\ TurboTax\ 2018.
The U.S. version of TurboTax 2018 saves files with an extension .TAX2018.