Overview of Australia's Electoral System
Australia holds federal elections to choose members of both the House of Representatives and the Senate. Elections are conducted by the Australian Electoral Commission (AEC), an independent statutory authority that ensures free and fair elections. Voting is compulsory for all enrolled Australian citizens aged 18 and over.
The Two Chambers of Parliament
Australia has a bicameral (two-chamber) federal parliament:
- House of Representatives (Lower House): 151 members, each representing a geographical electorate. The party or coalition that holds a majority here forms government.
- Senate (Upper House): 76 senators — 12 from each state and 2 from each territory. The Senate reviews legislation passed by the House.
How Preferential Voting Works (House of Representatives)
Australia uses a system called full preferential voting for the House of Representatives. Rather than simply selecting one candidate, voters rank all candidates in order of preference (1, 2, 3, and so on).
How votes are counted:
- All first-preference votes are counted first.
- If no candidate receives more than 50% of first-preference votes, the candidate with the fewest votes is eliminated.
- Their votes are redistributed to the remaining candidates according to the next preference marked on each ballot.
- This process continues until one candidate holds a majority.
This system ensures that the winning candidate has the broadest possible support across the electorate.
How Senate Voting Works
The Senate uses a system of proportional representation with preferential voting, which allows minor parties and independents a greater chance of winning seats.
Voters can choose to vote:
- Above the line: Number at least 6 boxes in order of preference for political parties/groups.
- Below the line: Number at least 12 individual candidates in order of preference.
Compulsory Enrolment and Voting
All Australian citizens aged 18 and over are legally required to:
- Enrol on the electoral roll — this can be done online at the AEC website.
- Vote at each federal election. Failure to vote without a valid reason can result in a fine.
Enrolment details must also be kept up to date when you move address.
Voting Options
Australians have several ways to cast their vote:
- On election day: At a polling place in your electorate.
- Pre-poll voting: In person at designated early voting centres before election day.
- Postal voting: By applying for a postal vote if you cannot attend in person.
- Overseas voting: At Australian embassies, consulates, or select overseas locations.
Election Timing
Federal elections must be held at least every three years for the House of Representatives. The Prime Minister advises the Governor-General to dissolve parliament and call an election, typically giving around 5–6 weeks of campaigning time. A double dissolution election, where both chambers are dissolved simultaneously, is rare but has occurred in Australian history.
Where to Get Official Information
The Australian Electoral Commission (AEC) is the authoritative source for all electoral information. Visit aec.gov.au to check your enrolment, find your polling place, or learn more about how votes are counted.