I may have made a mistake with my 1090 info. I know I can't correct it until I can do an amendment, but is there a way to see if the numbers will make a difference?

Make a copy of you turbotax tax file...then open it and do a "what if" change. Remember to delete the copy so you don't get confused next year (like I did).

That worked perfectly for the federal return. Do you know if there's a way to do it with my state return?