The amount you repay each year is a percentage of your income. The percentage increases as your income increases, so the more you earn, the higher your repayment will be. The ATO will calculate your compulsory repayment for the year and include it on your income tax notice of assessment


2017-2018 Repayment thresholdRepayment % rate
2017-2018 repayment rates
Below $55,874Nil
$55,874 - $62,2384.0%
$62,239 - $68,6024.5%
$68,603 - $72,2075.0%
$72,208 - $77,6185.5%
$77,619 - $84,0626.0%
$84,063 - $88,4866.5%
$88,487 - $97,3777.0%
$97,378 - $103,7657.5%
$103,766 and above8.0%



Reference: http://studyassist.gov.au/sites/studyassist/payingbackmyloan/loan-repayment/pages/loan-repayment