53 Pa.C.S. § 8425
(a) General rule.— A taxpayer who has paid an eligible tax to a local taxing authority may file a written request with the local taxing authority for refund or credit of the eligible tax. A request for refund shall be made within three years of the due date for filing the report as extended or one year after actual payment of the eligible tax, whichever is later. If no report is required, the request shall be made within three years after the due date for payment of the eligible tax or within one year after actual payment of the eligible tax, whichever is later.