Big Sur is compatible with TurboTax. Please take a look at the following thread for options to try.
Solved: Mac OS Big Sur - When will Turbotax run under this ...
Were you able to attempt the troubleshooting steps for Mac systems?
Please feel free to use the troubleshooting steps found below:
Troubleshoot TurboTax for Mac download issues
TurboTax for Mac installation troubleshooter
TurboTax for Mac won't open when installed
Remove and reinstall TurboTax for Mac
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