There is known issue on the Mac, but it does not seem like an issue caused by the Mac. TurboTax worked fine on all supported versions of MacOS until the update a couple weeks ago, when it stopped working on BigSur only—it still works fine on newer MacOS versions. Old versions of TurboTax work on BigSur, but when patched with an update, they stop working. This is clearly an Inuit issue. They could at least offer the last working version as a stopgap solution.
