You would need to file both a MD and a DE return as a part year resident of both states. Be sure that you have entered in the Personal Information area of TurboTax that you resided in more than one state. Since you only had income in Maryland, you would prepare that state's return first in TurboTax. and then prepare Delaware.
Assuming that you still only work in MD and only live in DE for 2026, you will prepare a MD non-resident return first then a DE full year resident return after that when you file taxes for 2026 early in 2027.
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