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According to a "real" person (Val) on support line "Windows 11 is not supported", but the System Requirements says

 

Operating System

  • 2021: Windows 8.1 or higher (Windows 8 not supported) 

Info from link 

https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...

 

So this should include support for Windows 11 since that is 8.1 or higher??