.TT13 File

The tt13 file extension is mainly related to TurboTax accounting software by Intuit.

These tt13 files contain saved tax returns for year 2013 prepared in the desktop version of the program.

Files with tt13 extension might be found as 2013 tax returns forms created in TurboTax accounting program.

How to open:

You can work with these tax returns in TurboTax.

How to convert:

TurboTax is generally able to export its own formats.