Acting prime minister

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An acting prime minister is a cabinet member (often in Westminster system countries) who is serving in the role of prime minister, whilst the individual who normally holds the position is unable to do so. The role is often performed by the deputy prime minister (where that position exists), or by another senior minister.

The office is commonly used when the prime minister is absent from the territory of that nation or when the prime minister is unable to perform duties for health reasons.

An acting prime minister should be distinguished from a caretaker prime minister, which refers to an outgoing prime minister following an electoral defeat, and who by convention does not implement new policies or an interim prime minister who is appointed to perform a similar role to a caretaker prime minister, but who is typically not a prime minister at the time of being appointed.

Statutory authorityEdit

Within a Commonwealth nation, the office of acting prime minister like that of prime minister is found only in convention, and is not legislated.[citation needed] The Department of Prime Minister and Cabinet, or an equivalent ministry, drafts, reviews and publishes any formal conventions (though these are expressly non binding in a court of law).[citation needed]

By countryEdit


According to House of Representatives Practice, an official publication of the Parliament of Australia, the Prime Minister of Australia "may make temporary ministerial arrangements without reference to the Governor-General. A Minister may act for another Minister on account of absence from Australia or from the Ministry or due to ill health. The Acts Interpretation Act confers upon an Acting Minister the same power and authority with respect to the absent Minister's statutory responsibilities."[1]

The position of acting prime minister is a special case of an acting minister, and generally occurs when the prime minister is travelling overseas, is on vacation, or is in ill health. In the early 20th century, when travel by ship was still the norm, it was not uncommon for there to be an acting prime minister for months on end.

The deputy prime minister is usually designated as the acting prime minister, although another senior member of the government may fill the role if both the prime minister and deputy prime minister are unavailable.[1] An acting prime minister is required quite frequently – for instance, between 3 December 2007 and 23 February 2009 (during Kevin Rudd's first term), Julia Gillard acted as prime minister on 16 separate occasions.[2]

The term acting prime minister is sometimes also applied to someone who is temporarily appointed Prime Minister following a death in office (more commonly called a caretaker prime minister or an interim prime minister). Examples include Frank Forde (seven days following John Curtin's death), Earle Page (19 days following Joseph Lyons' death), and John McEwen (22 days following Harold Holt's disappearance).

Unlike those who merely acted in the absence of a prime minister, Forde, Page and McEwen were officially commissioned by the Governor General and took the oath of office; they are considered prime ministers in their own right.[3]


In Canada, the Deputy Prime Minister—a position that is not always in use—becomes acting head of government in the event that the Prime Minister is absent from Canada or incapacitated. Prior to the creation of the Deputy Prime Minister position, there was one particular notable brief appointment of an Acting Prime Minister made by a Canadian Prime Minister. In February 1958, Prime Minister John Diefenbaker appointed Ellen Fairclough as acting Prime Minister for two days while he was absent from Canada.[4]


The designated Acting Prime Minister takes the role of Prime Minister as Acting Prime Minister, for up to one hundred consecutive days, if the incumbent is temporarily incapacitated.[5] Whilst in other countries the term "Acting Prime Minister" only refers to an individual actually performing the role, in Israel the term is also in use when a designated Minister is allocated, even if they never actually perform the role.

New ZealandEdit

In New Zealand, the Acting Prime Minister is the designated head of government when the incumbent is not available to fulfill their duties. This includes when the Prime Minister is overseas, unwell, or otherwise temporarily unavailable. Typically this position is filled by the Deputy Prime Minister.[6] Hugh Watt, who was then the Deputy Prime Minister, served as Acting Prime Minister for six days, after Norman Kirk died in office in 1974.

Deputy Prime Minister Winston Peters was serving as Acting Prime Minister as of 21 June 2018 until 2 August 2018, while Jacinda Ardern took maternity leave.[7]

Prior to the establishment of the Deputy Prime Minister role, a senior Minister would be appointed to act as Prime Minister when, for example, the incumbent was travelling overseas. In the current era, when both the Prime Minister and Deputy Prime Minister are unavailable, the next highest ranking minister who is available will be asked to act as Prime Minister, until a colleague of higher rank is available again.[8][9][10]


  1. ^ a b Chapter 2 House, Government and Opposition, House of Representative Practice (5th edition). Published by the Parliament of Australia.
  2. ^ Dates and individuals who acted as Acting Prime Minister
  3. ^ "Prime Ministers". Australian Prime Ministers. Museum of Australian Democracy. Archived from the original on 14 March 2018. Retrieved 23 February 2018.
  4. ^ "The Appointment of Ellen Fairclough as Canada's First Female Cabinet Minister". Diefenbaker Canada Centre , University of Saskatchewan. Retrieved 20 February 2018.
  5. ^ "Miri Regev appointed acting PM while Netanyahu abroad". Times of Israel. 14 June 2017. Retrieved 20 February 2018.
  6. ^ "Deputy Prime Minister". Cabinet Manual. Department of Prime Minister and Cabinet. Retrieved 6 March 2018.
  7. ^ "Jacinda Ardern on baby news: 'I'll be Prime Minister and a mum'". RNZ. 19 January 2018. Retrieved 19 January 2018.
  8. ^ Marwick, Felix; Trevett, Claire. "Bennett to serve as acting PM while Key, English are out of NZ". Newstalk ZB. Retrieved 6 March 2018.
  9. ^ Parker, Dan (20 August 2009). "Tony Ryall promoted to Acting Prime Minister". Newshub. Retrieved 6 March 2018.
  10. ^ Chapman, Grant (9 November 2017). "Kelvin Davis takes charge of the country as Acting Prime Minister". Newshub. Retrieved 6 March 2018.