Lower Earnings Limit (LEL) - This is the salary threshold above which you build up entitlement to state benefits Eg State Pension.
Primary Threshold (PT) - This the threshold at which you start paying Class 1 National Insurance Contributions as an employee.
Upper Earnings Limit (UEL) - At this threshold, Class 1 National Insurance contributions drop to a lower % (currently from 8% to 2%).
