you will do the non-resident state first (NY) and only list the NY income and related tax withholdings
Then complete the MA taxes where all income, even that earned in NY gets listed, MA should give you a credit for what is due to NY so that you are not taxed twice on the same dollar
The W-2 you received should clearly state the income earned in each state and the tax withholdijgns of each state
if you are using TT, it will figure all this out for you.
