A t06 file extension is related to the TaxCut 2006 a tax preparation software. A t06 file contains tax return data.
Software that open t06 file
T06 file extension - TaxCut 2006 tax return
What is t06 file? How to open t06 files?
File type specification:
The t06 file - a tax return created by TaxCut 2006 tax preparation software
TaxCut returns can only be opened by the version of TaxCut in which the return was created.
TaxCut was re-branded as "H&R Block At Home" for the 2009 tax year.
This t06 file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.
The default software associated to open t06 file:
TaxCut Home & Business for Mac 
Company or developer:
HRB Digital LLC.
TaxCut Home & Business for Mac is accounting software used to calculate federal tax returns.
Company or developer:
HRB Digital LLC.
TaxCut Home & Business is accounting software used to calculate federal tax returns.
List of software applications associated to the .t06 file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open t06 file, edit t06 file, convert t06 file, view t06 file, play t06 file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting t06 files.
Software that open t06 file - TaxCut 2006 tax return
Programs supporting the exension t06 on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open t06 file action.
