@AchesAndPains@mstdn.social @Ulrich_the_elder
Yes, voting is compulsory, or rather attending a polling place, having your name crossed off a list, being handed your ballot and directed to a booth. After that you're free to mark the ballot as you wish. Then you fold it and pop it into the ballot box.
Failure to vote can mean a $A25 fine.
Voting is always on a Saturday from 8 to 8. There are early voting centres in every municipality too and if you're out of your locality you can vote provisionally.