The Wage Tax must be filed quarterly and paid on a schedule that corresponds with how much money is withheld from employees' paychecks. Sign the return, enclose W-2 forms, PA Schedule SP (if applicable) and mail to: Philadelphia Department of Revenue, P.O. Box 1648, Philadelphia, PA 19105-1648.The IRS views any bonus you receive as wages. This means that almost all bonuses are taxed. Apply to HVAC Technician, Plumber, Certified Occupational Therapy Assistant and more! Write AMENDED RETURN on the top of the return and fill out the form with the corrected information. This Pennsylvania bonus tax calculator uses supplemental tax rates to calculate withholding on special wage payments such as bonuses. Most importantly, I wanted to help demystify the application process and the jobs available to you after completing an apprenticeship program. Note that employees can fill out a new Form W4 when applicable. Families who received an invitation, please fill out the Interest Form HERE.