Hi kylie-karad-
I believe allowances are our best option in paying these fees. Allowances use pay categories which you can configure to be PAYG and Payroll tax exempt; acting as an expense. Once the payroll category has been added the allowance rate can be added for the employee and included on the pay run/employees pay slip.
There are a few steps to get this set up. Take a look through our guide and reply here if you have any clarifying questions: How to create and pay fixed allowances
-Christine