The salary is based on "calculated by reference to the estimated average salary of the Chief Justice of the High Court of Australia over the notional five-year term of the appointment of the Governor-General". So the salary cannot be reviewed for the next 5 years after it is voted on and passed.
High Court—Chief Justice $624,880
https://www.remtribunal.gov.au/sites/default/files/2023-06/JRO%20Principal%20Determination%20No.%201%202023.pdf
