You receive a penalty notice in the mail and have to pay a fine. Similar to a traffic infringement or parking fine.

All elections are held on a weekend and voting booths are everywhere, to make it a little easier for everyone to vote.

You can choose to not mark the ballot, no one would know. As long as you turn up to a booth and get your name marked off, then you are considered to have voted.

As a result, voter turnout is generally over 90%.