If you were a resident of New Jersey while you were working in Philadelphia, that income is taxable by both New Jersey and Pennsylvania. In order to prevent double taxation, you will receive a credit on your New Jersey resident tax return for the tax you paid to Pennsylvania. You will need to file a full year resident tax return for New Jersey and non-resident return for Pennsylvania. Prepare the Pennsylvania non-resident first in TurboTax. If you paid, Philadelphia city tax, there is no credit or offset for that.
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