I was looking at this and the 2210 instructions don't specify anything about how to handle NIIT variations other than the comment on the form about including NIIT here. I see what you are saying - TT doesn't do the NIIT calculation automatically by quarter, but allows Line 16 to be adjusted if there was a value for the year as tho you are apportioning the year-end amount over the quarters like income; however doesn't handle a case where you are under NIIT for the year but jump above it for interim quarters (assuming it needs to be handled - maybe either NIIT applies to the entire year or it doesn't).
@dmertz @Mike9241 @DoninGA @VolvoGirl any thoughts?
