@zandy12 Check with payroll is the only answer.
Depending on the school, admin may be worse than useless with incorrect info. Hopefully you can speak to a payroll specialist who can give you exact calculations.
@thelostcoin Your taxable income:$3,692
Income tax payable:$833
Medicare levy payable:$74
Your income after tax & Medicare levy:$2,785
https://moneysmart.gov.au/work-and-tax/income-tax-calculator#!focus=1