NOTE : I am not a lawyer. Please get professional advice before doing anything rash.
This was written on 26th March 2020. Things are changing rapidly. You have been warned.
SEE ALSO : COVID 19 Absences
The legislation is here : https://www.legislation.gov.au/Details/C2020C00071
The Minister’s rules are here : https://www.legislation.gov.au/Series/F2017L01464
The amendment to the Minister’s Rules related to COVID 19 are here : https://www.legislation.gov.au/Details/F2020L00295
Yellow highlighting below is mine.
So until you have been forced to close by a Health Agency what you claim must match what you charge or you are breaking the law.