Government of Australia

Main articles: Government of Australia, Politics of Australia, and Monarchy of Australia

Parliament House, Canberra was opened in 1988, replacing the provisional Parliament House building opened in 1927.

Government House, Canberra, also known as "Yarralumla", is the official residence of the Governor-General.

Julia Gillard, Prime Minister of Australia since 2010

Australia is a constitutional monarchy with a federal division of powers. It uses a parliamentary system of government with Queen Elizabeth II at its apex as the Queen of Australia, a role that is distinct from her position as monarch of the other Commonwealth realms. The Queen resides in the United Kingdom, and she is represented by her viceroys in Australia (the Governor-General at the federal level and by the Governors at the state level), who by convention act on the advice of her ministers. Supreme executive authority is vested by the Constitution of Australia in the sovereign, but the power to exercise it is conferred by the Constitution specifically to the Governor-General.^[83][84] The most notable exercise of the Governor-General's reserve powers outside a Prime Minister's request was the dismissal of the Whitlam Government in the constitutional crisis of 1975.^[85]

The federal government is separated into three branches:

• The legislature: the bicameral Parliament, defined in section 1 of the constitution as comprising the Queen (represented by the Governor-General), the Senate, and the House of Representatives;
• The executive: the Federal Executive Council, in practice the Governor-General as advised by the Prime Minister and Ministers of State;^[86]
• The judiciary: the High Court of Australia and other federal courts, whose judges are appointed by the Governor-General on advice of the Council.

In the Senate (the upper house), there are 76 senators: twelve each from the states and two each from the mainland territories (the Australian Capital Territory and the Northern Territory).^[87] The House of Representatives (the lower house) has 150 members elected from single-member electoral divisions, commonly known as "electorates" or "seats", allocated to states on the basis of population,^[88] with each original state guaranteed a minimum of five seats.^[89] Elections for both chambers are normally held every three years, simultaneously; senators have overlapping six-year terms except for those from the territories, whose terms are not fixed but are tied to the electoral cycle for the lower house; thus only 40 of the 76 places in the Senate are put to each election unless the cycle is interrupted by a double dissolution.^[87]
Australia's electoral system uses preferential voting for all lower house elections with the exception of Tasmania and the ACT, which, along with the Senate and most state upper houses, combine it with proportional representation in a system known as the single transferable vote. Voting is compulsory for all enrolled citizens 18 years and over in every jurisdiction,^[90] as is enrolment (with the exception of South Australia).^[91] The party with majority support in the House of Representatives forms the government and its leader becomes Prime Minister. In cases where no party has majority support, the Governor-General has the power to appoint the Prime Minister, and if necessary dismiss one that has lost the confidence of Parliament.^[92]

There are two major political groups that usually form government, federally and in the states: the Australian Labor Party, and the Coalition which is a formal grouping of the Liberal Party and its minor partner, the National Party.^[93][94] Independent members and several minor parties have achieved representation in Australian parliaments, mostly in upper houses.

Within Australian political culture, the Coalition is considered centre-right and the Labor Party is considered centre-left. Queensland in particular, along with Western Australia and the Northern Territory, are regarded as comparatively conservative.^{[95][96][97][98][99][100]} Victoria, South Australia, Tasmania, and the Australian Capital Territory are regarded as comparatively socially liberal.^{[100][101][102][103]} New South Wales has often been regarded as a politically moderate bellwether state.^[104][103]

Following a partyroom leadership challenge, Julia Gillard became the first female Prime Minister in June 2010.^[105] The most recent federal election was held on 21 August 2010 and resulted in the first hung parliament in over 50 years. Gillard was able to form a minority Labor government with the support of independents.