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Instead, the prime minister of the day decides when to call an election within their three-year term.
These are the main arguments for and against fixed four-year terms, and how likely the change is to occur.
Why do we have a three-year maximum parliamentary term?
“In a sense, what we ended up with in 1901 was a kind of compromise on that sort of idea.”
Half-Senate elections are typically held at the same time as the election of members of the House of Representatives.
What are the arguments for fixed four-year parliamentary terms?
Having a fixed term of parliament would remove the ability for prime ministers to call early elections, as well, which typically favour the incumbent government.

Australian federal elections are generally held every three years. Source: AAP
“While early elections have not been common in Australia in recent years, they certainly have been quite common in the past,” Bongiorno said.
Holding elections slightly less frequently would also result in a “minor reduction” in electoral spending, Bongiorno said.
What are the arguments against fixed four-year parliamentary terms?
There’s also the question of whether to shorten Senate terms to four years or extend them to eight years.
“That’s, to my mind, deeply worrying from a democratic point of view, because that’s not what voters thought they were getting when they probably voted above the line at a Senate election, and then they end up with someone who doesn’t belong to the party or grouping that they voted for and is potentially sitting there in the Senate for years and years.”
How likely is the change?
“If the prime minister’s got a desire to proceed with it, despite our public differences, we have a pretty good working relationship, so I’d be happy to have a conversation with him,” he told The Australian Financial Review Business Summit last March.
“I’m astonished that it’s being discussed, to be perfectly honest. I would’ve thought that any government, and certainly this one, would’ve been pretty shy of talking about reforms needing a referendum anytime soon.”