Many accounting and tax preparation software support the TXF Tax Exchange format and thus can exported their own tax files, so it should be quite possible to convert TAX to TXF with some of the software listed below.
Convert TurboTax tax return file to Tax Exchange Format.
We found 3 software records in the database related to .tax to .txf file format conversion.
Microsoft Windows software - convert tax to txf on Windows
A tax preparation software developed by Intuit
Convert from tax file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned tax to txf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A personal finance management program by Intuit
Apple macOS / Mac OS X software - convert tax to txf on OS X
Mac version of popular Quicken personal finance management software