This is not quite correct. You can file with M1SA and M1M combined. The issue is TT is double counting certain deductions (such as charitable contributions) which is not allowed. I itemize with M1SA and have additional income subtractions on M1M for school tuition and 529 contributions, which is not on M1SA. I haven’t bothered to file yet because I double check all forms on federal and state precisely because of these errors. When I checked the forms myself, I noticed this “double counting” and reported it to TT. When you pay for their software, you expect better quality. I think this is the last year I will use TT.
