Hi Martin, to set this up, update the settings of the pay categories to be included by navigating to Payroll Settings > Pay Run Settings > Pay Categories > Update the 52-week average field to "Include for the purpose of 52-week average calculations" - next, update the leave category in Payroll Settings > Pay Run Settings > Leave Categories > Select the Leave Category that you would like the system to base this on and tick the 52-week average calculation box.
