Here is Pennsylvania's rule on employer withholding:
Pennsylvania law requires employers to withhold Pennsylvania personal income tax from employees’ compensation in two common cases:
- When resident employees perform services within or outside Pennsylvania; and
- When nonresident employees perform services within Pennsylvania.
https://www.revenue.pa.gov/TaxTypes/EmployerWithholding/Pages/default.aspx
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
