More than 1.3 million people are still not enrolled to vote and, with polls closing on Monday night, they're in danger of missing out on the chance to vote.
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And about one-third of the "missing" voters are young people aged between 18 and 24.
At the 2010 election, which resulted in minority government, a whopping 3.2 million Australians missed out on the chance to vote, including 1.5 million people who weren't enrolled by the time Australia went to the polls.
Another 900,000 people who were enrolled didn't turn up to vote on the day, and a further 700,000 lodged an informal vote – either intentionally lodging a donkey vote or unintentially failing to fill in their form correctly.
That means one in five potential voters missed out on their vote.
This year, the Australian Electoral Commission is making a concerted effort to sign voters up online.
Spokesman Evan Ekin-Smyth said about 50,000 voters were enrolling or updating their details every day. He urged people to visit the website if they were unsure whether their details were up to date.
For the first time, voters can change their address online, enrol to vote for the first time, and upload scanned forms without having to send forms through the post.
While the AEC always braces for a last-minute rush of enrolments in the last days before polls close, voters are enrolling at a faster pace than the last election, Mr Ekin-Smyth said.
"We think that's because of online services, which just makes it so much easier," he said.
The AEC plans another promotional blitz this weekend, including TV and social media advertisements.
About 100,000 people have enrolled since June, and at least 40,000 people have clicked through to the AEC enrolment web page from links posted on Facebook.
– with AAP
