How the Australian Electoral System Works

Australia's electoral system is one of the most distinctive in the world. Unlike many countries where you mark an X next to one candidate, Australian voters number every candidate in order of preference. This preferential system ensures the winning candidate has the genuine support of the majority. For the Australian Citizenship Test, you must understand how elections work, who can vote, and why voting is compulsory.

The Two Houses of Parliament and How They're Elected

Australia's federal parliament has two chambers, each elected differently:

The House of Representatives

The House of Representatives has 151 members, each representing a geographic electorate. Members are elected using preferential voting (also called instant-runoff voting). You number every candidate from 1 (most preferred) to the last number. If no candidate receives more than 50% of first-preference votes, the candidate with the fewest votes is eliminated and those votes are redistributed according to preferences. This continues until one candidate holds a majority.

Members of the House of Representatives serve a maximum 3-year term, though elections can be called earlier. The party or coalition that wins the majority of seats forms government, and their leader becomes the Prime Minister.

The Senate

The Senate has 76 senators — 12 from each state and 2 each from the Australian Capital Territory and the Northern Territory. Senators are elected using a system of proportional representation, which means smaller parties have a fairer chance of winning seats. State senators serve 6-year terms, while territory senators serve 3-year terms.

The Senate acts as a "house of review" — it scrutinises legislation passed by the House of Representatives before it becomes law.

Compulsory Voting: Why You Must Vote

According to the Department of Home Affairs, voting is compulsory for all enrolled Australian citizens aged 18 and over. Australia is one of only around 20 countries in the world with compulsory voting. Failing to vote without a valid reason can result in a fine.

The rationale is that compulsory voting leads to governments that better represent the will of the entire population — not just those motivated enough to turn up voluntarily. This reflects the Australian value of equality and democratic participation.

• Who must vote: All Australian citizens aged 18 and over
• Enrolment: You must enrol on the electoral roll within 8 weeks of becoming a citizen
• Penalty for not voting: A fine, unless you have a valid reason
• Secret ballot: Your vote is private — no one can see how you voted

Who Runs Australian Elections?

The Australian Electoral Commission (AEC) is an independent government body responsible for conducting federal elections. Its independence from the government of the day ensures elections are free and fair. The AEC maintains the electoral roll, counts votes, and declares results.

This independence is a cornerstone of Australian democracy. No party or politician has control over how elections are run — a key feature that distinguishes Australia from countries with less secure democratic institutions.

State and Local Elections

Beyond federal elections, Australia has three levels of government, each with its own elections:

• Federal (Commonwealth) Government — runs national elections for the House of Representatives and Senate
• State and Territory Governments — each state and territory holds its own elections for its parliament
• Local Councils — elect councillors who manage local community services

Once you become an Australian citizen, you are expected to participate in all levels of elections. Understanding this three-tier structure is a common topic in the Australian Citizenship Test. For more detail, see our guide on the three levels of government.

How Preferences Work in Practice

Here's a simple example of preferential voting:

In this example, Candidate C is eliminated first. Their votes are redistributed based on each voter's second preference. This gives Candidate A enough support to win with a genuine majority — even though they only received 40% on first preferences.

Key Terms You Must Know

• Preferential voting — numbering candidates in order of preference
• Proportional representation — Senate voting system where seats reflect the share of votes
• Electoral roll — the official list of registered voters
• Electorate — a geographic area represented by one member of the House of Representatives
• By-election — an election held between general elections to fill a casual vacancy
• Polling place — the official venue where you cast your vote

Frequently Asked Questions

Is voting compulsory in Australia?

Yes. Voting is compulsory for all enrolled Australian citizens aged 18 and over. Failure to vote without a valid reason results in a fine. Australia is one of around 20 countries worldwide with compulsory voting.

How many members are in the House of Representatives?

There are 151 members in the House of Representatives. Each member represents a geographic electorate and serves a maximum 3-year term.

How many senators are in the Australian Senate?

The Senate has 76 senators — 12 from each state and 2 each from the ACT and Northern Territory.

What is preferential voting?

Preferential voting means you number every candidate on the ballot in order of your preference (1 for your first choice, 2 for second, and so on). If no candidate wins a majority of first-preference votes, the lowest-ranking candidate is eliminated and their votes redistributed until one candidate has a majority.

Who conducts federal elections in Australia?

The Australian Electoral Commission (AEC) — an independent government body — is responsible for conducting all federal elections. Its independence ensures elections are free, fair, and impartial.