.TAX09 File Extension
TurboTax 2009 Tax Return File
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What is a TAX09 file?
Tax return created by TurboTax 2009, a U.S. tax preparation and filing tool; contains 2009 tax forms and tax data entered by the user; used for filing taxes during the 2010 calendar year for the 2009 tax year.
TAX09 files are much more commonly seen with the .TAX2009 extension.