File Pennsylvania and New Jersey tax returns—and possibly South Carolina.
If you worked in PA lived in NJ, your employer should have withheld NJ tax from January to May. File a part-year NJ return for that period, reporting your PA income earned while living in NJ. It should be listed as NJ wages in Box 16 of your W-2.
From there, I’m not sure. You bought a house in South Carolina but kept an apartment in PA. Did you live in South Carolina for a majority of the time after you bought the house? Did your employer withhold South Carolina tax?
Even though you obtained a South Carolina driver’s license, you did not abandon your PA residency because you have a place to live in PA, earn PA wages and said you will stay in your apartment once work returns to your PA office.
Unless your employer withheld SC tax or you spent most of your time in South Carolina, I would say to file a part-year PA return from May to December.
If your employer withheld SC tax and/or you spent most of your time in SC, then you would file a part-year PA and part-year SC income tax return. All your income from May to December would still be taxable to PA because you continued to telework there. It would be taxable to South Carolina for the same period because you lived there. SC will give you a tax credit for PA tax.
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