not completely true. I found this out with W95, Vista, XP, and W7. the computer will still continue to function just that apps that need a newer OS won't. So according to Turbotax, their desktop versions may not work without W11 but online will function
https://ttlc.intuit.com/turbotax-support/en-us/help-article/download-products/end-support-windows-8-...
any by the way be glad you don't use MACs; There OS is updated more frequently making older OS unusable with Turbotax
