In Australia, it is the gambling operators that are charged tax, not the players. The amount of tax the operators pay depends on the type of game. Also, on the location of the poker machines or casinos.
There is no tax to pay for online Australian players either, despite a few online Australian casinos in operation.
The only fees or charges a player might encounter when playing an online casino could be fees to withdraw or deposit money into international casino sites or when converting the Australians dollar into the website’s preferred currency.