Pennsylvania law requires withholding at a rate of 3.07 percent on non-wage Pennsylvania source income payments made to nonresidents. The Wage Tax must be filed quarterly and paid on a schedule that corresponds with how much money is withheld from employees' paychecks.If you have any doubt about the requirement to withhold, go ahead and do it and use a Form 1042. S. payee UNLESS payee agrees to provide information with respect to its U.S.. Nonresidents are taxed only on the income they receive from sources within Pennsylvania, and cannot qualify for the credit for taxes paid to other states. Search for business topics like employer tax identification number (EIN) information, with the A-Z Index. Use IRS Form 8233 to claim a tax treaty for any part of your compensation that is exempt from withholding.