The Wage Tax is a tax on salaries, wages, commissions, and other compensation. Statutory Residency A person who has a domicile outside the commonwealth can still be considered a resident of Pennsylvania for personal income tax purposes.Form 6166 is a letter printed on US Department of Treasury stationery certifying that the individuals or entities listed are residents of the United States. Tax requirements for anyone who is paid for work performed in Philadelphia, or for Philadelphia residents receiving unearned income. A resident of Pennsylvania is someone who is living and intends to reside in Pennsylvania, with or without a fixed or permanent address. Some states classify you as a full-year resident if you lived there for at least 183 days, although others have different thresholds. What is the definition of Pennsylvania Residency? How do I determine residency for PA income tax purposes? Individuals who have domiciles or statutory residences in.