The Australian Electoral Commission is reminding Australians who are eligible to vote but not yet enrolled that they have only one week to fulfil what is a legal obligation.
Voting is compulsory for every Australian citizen aged 18 years or older.
The AEC's Peter Kramer says now an election has been called, eligible voters have until 8:00pm Monday, August 12 to have their names added to an electoral roll.
They could do it either online or by collecting an enrolment form from a post office or an electoral commission office, he says.
More information can be found at the .
"This is the one chance people get every three years to have a voice in who governs our country," Mr Kramer said.
"And in Australia we have a fairly rare system in that enrolment and voting is compulsory on both counts.
"So basically, people are not just encouraged but they are required to enrol to vote and to cast their vote."
Mr Kramer says an estimated one in four young people who were eligible to vote are not on a roll.
"This is an important time for them, quite often they're finishing school, going into uni, getting on with a new phase in their lives," he said.
"Voting's a habit. It's one of those things that once you've done it once you will keep on doing it so it's important to get into the habit of voting."