Who is eligible to vote in Australian federal elections?

All Australian citizens aged 18 or over are eligible to vote in Australian federal elections. Eligibility is set out in the Commonwealth Electoral Act 1918, which requires Australian citizenship as the foundation for voting rights, with limited exceptions for British subjects who were enrolled before 26 January 1984.

The path to federal voting eligibility is straightforward. Adult Australian citizens enrol with the Australian Electoral Commission either when they become citizens at a citizenship ceremony, when they turn 18, or when they otherwise become eligible. Enrolment is compulsory once eligible, with penalties for failing to enrol. The AEC automatically updates the roll when a person changes address through Services Australia, the ATO, or other federal agencies, but enrolled voters remain responsible for keeping their details current.

Several categories of disqualification apply. People of unsound mind cannot vote under section 93 of the Commonwealth Electoral Act, although the section has been narrowly interpreted to limit exclusion to people who cannot understand the nature and significance of voting. People serving a federal prison sentence of three years or more cannot vote in federal elections, although the High Court's 2007 Roach v Electoral Commissioner decision struck down the broader prohibition on all prisoners voting. People convicted of treason or treachery cannot vote.

Permanent residents who are not citizens cannot vote in federal elections. About 1.5 million Australian permanent residents are in this position, although they pay taxes, use Medicare, and otherwise live as full members of Australian society. They can vote at local government elections in some states (particularly Victoria) and can apply for Australian citizenship after meeting residency and other requirements, which then opens federal voting eligibility. About 200,000 Australians become citizens each year through this pathway. Special voting arrangements operate for Australians overseas (postal and polling at most diplomatic missions) and for Antarctic and remote communities through mobile polling teams.