Earnings limits and thresholds for Class 1 contributions Earnings limits and thresholds for Class 1 contributions Changes not yet applied. Later legislation changes this provision in ways not yet written into the text below: Sch. 10 para. 7 repealed by Pensions Act (Northern Ireland) 2008 Sch. 6 Pt. 7 1Paragraph 1 Earnings limits and thresholds for Class 1 contributions