My worker has said that they can't see that HECS/HELP is being deducted from their pay. Is this something that they should see on their payslip?

HECS/HELP debt balances can be seen on the worker's myGov portal.

When a worker completes their TFN declaration during onboarding, they are required to make a selection relating to deductions for HELP/HECS debt. Provided that they have made the correct selection, Oncore will deduct the required level of PAYG tax; taking into account additional amounts for HELP/HECS. The total amount of PAYG tax only is represented on their payslip; but they can check using the ATO's individual tax calculator to see whether they have made the appropriate selections and if they match your payslip.