Electoral Council of Australia

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Electoral Systems

 

Casual Vacancies

Name of PR System

How is a casual vacancy filled?

Commonwealth Senate

Senate System

The new member is chosen by the relevant State/Territory Parliament.

If the vacating Member was endorsed by a political party at the time of election, the replacement must if possible be a member of the same party.

NSW Legislative Council

Optional preferential proportional representation

The new member is elected at a joint sitting of Upper and Lower Houses.

Generally nominations are limited to the party for which the member vacating the seat was elected.

Western Australia Legislative Council

Proportional Representation

The new Member is chosen by recount.

If a recount is not practicable, or if there is no available consenting candidate from the party of the vacating member, a by-election may be held for the vacant position.

South Australia Legislative Council

Modified Hare-Clark

The new Member is chosen by an assembly of both Houses of Parliament.

If the vacating Member was endorsed by a political party at the time of the election, the replacement must if possible be nominated by the same party.

Tasmania House of Assembly

Hare-Clark

The new Member is chosen by recount.

If a recount is not practicable, or if there is no available consenting candidate from the party of the vacating member, a by election may be held for the vacant position.

Australian Capital Territory Legislative Assembly

Hare-Clark

The new Member is chosen by recount.

If a recount is not practicable, the Legislative Assembly shall choose a replacement as follows.

If the vacating Member was endorsed by a political party at the time of election, the replacement must if possible be nominated by the same party. Otherwise the person chosen cannot have been a member of a political party during the preceding 12 months.

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