A seller or holder may increase the late fee by providing the buyer with a notice of the increase to the extent required and in the manner specified by the Truth in Lending Act ( Public Law 90-321, 15 U.S.C. § 1601 et seq.) and the regulations issued pursuant thereto by the Board of Governors of the Federal Reserve System (Regulation Z) as such act and regulations may from time to time be amended.
69 P.S. § 1306.2