The MD and NY forms should add together to show your full income. Each state should only show credits for the other 3 states worked in, not NY and MD.
For example:
Lived in MD, worked in state A and state B
Lived in NY, worked in state C
MD return would show MD income, state A and state B income. MD would have a credit for state A and B income tax paid.
NY return would show NY income and state C income. NY would have credit for state tax paid to state C.
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