If you are a PA resident, then you would file taxes in PA, not MD. PA and MD have a reciprocal agreement that applies to anyone who lives in the one state and works in the other. This means that whichever state you live in is the state you pay taxes in. So if MD did not withhold taxes from your income, then you would not need to file an MD return.
Since PA does not have a standard deduction and pretty much everyone with earned income has to file a return, you will need to file a PA return.
If you are filing a MD return to get a refund of taxes withheld, you will enter $0 as your income earned in the state and leave the amount withheld as the amount withheld.
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