Seems like you are interpreting it better than I am.
Did you do your Federal return first? Usually if you do the Federal first, the income flows and you just allocate the amount to go to that state.
I may need to edit the original answer.
The main objective is that you only pay tax on income while you lived and/or worked in Massachusetts. And it sounds like the program does not know your income (usually it pulls it from the W2's you entered on the Federal return.)
Sounds like I was wrong. First enter what you earned on all your W2's, then enter what is not attributable to MA. The program will subtract this second amount from the first.
That is confusing.
