There is only one file type that uses the .TT15 extension:
TurboTax Canada 2015 Tax Return
A TT15 is a 2015 tax return created with the 2015 version of TurboTax Canada. It stores Canadian federal and province tax information for the 2015 tax year. It also contains data entered by the user.
Tax returns completed with the TurboTax Canada application can be filed electronically or printed and mailed. Since TT15 files store tax information for the 2015 tax year, they are most commonly created and used in 2015. Tax returns for the 2014 year use the .TT14 extension and are created by the 2014 version of TurboTax Canada.
NOTE: The U.S. version of TurboTax 2015 saves files with a .TAX2015 file extension.
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Updated: January 5, 2017