Files that contain the .tax file extension are most commonly used by the TurboTax tax preparation software program that is distributed by Intuit Inc.
There are a variety of TurboTax products available including the TurboTax Deluxe and the TurboTax Premier versions of the software. The tax returns that are created when a user does their taxes with these software products use the .tax file extension. Users can access their previous years' tax returns by opening these TAX files.
Some financial applications allow a user to import their tax information by importing the TAX files that have been created with these software programs.
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If you have additional information about the TAX file format or software that uses files with the TAX suffix, please do get in touch - we would love hearing from you.