Forms and instructions to use when filing City tax returns. Forms include supplementary schedules and worksheets from 2009 to present.You can submit a request for an agreement online through the Philadelphia Tax Center. Here's how: Log into your Philadelphia Tax Center profile. Pennsylvania law requires withholding at a rate of 3.07 percent on non-wage Pennsylvania source income payments made to nonresidents. You must enclose a signed statement with your New Jersey nonresident returns indicating you are a resident of the Commonwealth of Pennsylvania. We ask for the information on Form 8922 to carry out the Internal Revenue laws of the United States. You're required to give us the information. I am going to assume that your employer correctly withheld only NJ taxes from your W2 besides the Philadelphia local tax.