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55 PENNSYLVANIA UNEMPLOYMENT COMPENSATION LAW PENNSYLVANIA UNEMPLOYMENT COMPENSATION LAW PENNSYLVANIA UNEMPLOYMENT COMPENSATION LAW Section 13(4) of Act 5 of 2005, which amended subsection (j), provided that the amendment shall apply to the calculation of interest on additional contributions that are unpaid on or after July 1, 2005. Section 301.1. Determination of Contribution Rate; Experience Rating.--