It may be that they have a salaried position that is paid on 21st of month for instance, and they then do bank work for extra hours which is on a different payroll run, hence the 2 payslips. My husband is a nurse and has confirmed this…
We've also discovered a few of the employers in the insurance sector are similar, salary paid end of the month, overtime is paid on on a mid month cycle. Always reminding assessors to have a quick look at gross pay on payslips even if they appear sequential.
