Car Allowance Setup for Payroll Tax Computing

Hi all,

Under our Awards, we are paying employees car allowance of 98 cents per km. We have set up two separate pay categories for the taxable (for the excess of ATO rate) and non-taxable amount (payment at 88 cents per km).

However, when it comes to Payroll Tax calculation, the exempt component of car allowance is calculated using ATO rate of the previous financial year which is 85 cents for F23-24. How should we set up the payroll category so that payroll tax will compute it right? 

Any suggestions are greatly appreciated.

Ruby