You will have to file a nonresident Pennsylvania tax return to pay tax on the income you earned in Pennsylvania for self-employment. You will also have to report the income to your resident state Maryland, but you will be able to claim the credit for taxes paid to another jurisdiction on the Maryland return.
Under the reciprocal agreement, one state will not tax a resident of the other state on compensation subject to employer withholding, so it applies only to W2 income.
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