The constitution of a nation is the set of rules that govern how a government can exercise public power. A constitution identifies who or what institutions should exercise power and how they should do it. The government is usually the most powerful coercive force within a country, so the rules about how a government should exercise power are very important.
In a democracy the purpose of a constitution is to prevent the government from abusing its power over the people of a nation, and to ensure that the government exercises its power as the people wish. This can be complicated to create, as different people will disagree over how a government should exercise its power.
The Australian constitution is contained in the Commonwealth of Australia Constitution Act 1900. The act was passed by the UK Parliament after two conventions and referendums in the colonies of New South Wales, Victoria, South Australia, Queensland, Tasmania and Western Australia. New Zealand decided not to join the Commonwealth of Australia but it is still possible for New Zealand to join if it wants to do so.
In most countries the constitution is a written document. The US, Australia, Canada, China, India and almost every other nation have a single written document. A written constitution usually provides for the basic institutions that exercise public power, and how they do it. It also usually provides procedures for how the constitutional rules are enforced and how they may be changed.
Unlike most countries, New Zealand follows the UK in considering itself to have an ‘unwritten’ constitution. New Zealand has had a succession of constitution acts, passed first by the UK Parliament in 1846 (but then suspended) and 1852, and then by the New Zealand Parliament in 1986. These acts have contained key provisions relating to the institutions and procedures of government.
The Constitution Act 1986 brought together key legal provisions regarding the institutions and procedures for the exercise of power that had previously been scattered in several places. It was organised in four main parts, dealing with:
Canada, Australia and other former British colonies have also had constitution acts, initially passed by the UK Parliament, which have been referred to as ‘the constitution’ in those nations. But, since around 1860, New Zealand has not considered one act to be its constitution.
One of the most distinctive constitutional characteristics of the US is that the Supreme Court can strike down legislation passed by Congress if it is inconsistent with the US Constitution. However, most Americans do not realise that this is not provided for in the written US Constitution itself. Rather, it was devised by the Supreme Court in its judgment in the case Marbury v Madison in 1803.
It’s not clear why New Zealand’s constitution is regarded as unwritten. Key institutions and rules governing the exercise of public power in Australia, Canada and the US are also based on practice or convention outside written provisions of their constitutions. But those nations still consider their constitution to be in one written document.
Perhaps aspects of New Zealand’s constitutional history have led to a greater focus on the importance of constitutional conventions rather than written documents. Possibly New Zealand’s ability to amend the Constitution Act itself from 1857 lessened its apparent significance. Or perhaps it is significant that New Zealand’s Constitution Act 1986 is not supreme law: the New Zealand judiciary does not have the role or power to strike down other laws as inconsistent with the act.
Whatever the reasons, like the UK, New Zealand considers that its basic institutions and procedures governing the exercise of public power – its constitution – are set out in both written documents and unwritten practices.
A month after winning the 1975 general election, Prime Minister Robert Muldoon issued a press statement saying that compulsory superannuation contributions no longer needed to be made. After a public servant (a Mr Fitzgerald) took Muldoon to court, Chief Justice Richard Wild declared that the prime minister’s statement breached article 1 of the Bill of Rights 1688 that prohibited the suspension of the law by regal authority. However, recognising that Parliament would pass the necessary legislation, the chief justice also adjourned the case for six months to allow that to occur.
New Zealand’s constitution is located in a variety of laws, court judgments, other instruments of government and constitutional conventions. Different scholars and commentators identify and emphasise different elements of the constitution. But there is general consensus that New Zealand’s constitution includes:
Many commentators also consider the Treaty of Waitangi to be part of New Zealand’s constitutional arrangements, but the position of the treaty is disputed.
Constitutional conventions are the most unwritten part of the New Zealand constitution. They are practices of constitutional behaviour that have been followed so consistently and which are believed to have such force that they are generally considered to govern constitutional behaviour.
The Canadian Supreme Court has pointed out that constitutional conventions may be more important than some laws and summarised the situation in an equation: ‘constitutional conventions plus constitutional law equal the total constitution of the country.’1
Conventions may not be enforced by the courts. They live and die according to continued practice and belief.
Constitutional conventions provide some of the key rules of New Zealand’s constitution. They add to, or take away from, legal rules in sometimes dramatic ways. Examples include:
The sovereign monarch, Queen Elizabeth II, is the head of state of New Zealand. She is represented in New Zealand by the governor-general, who is appointed on the advice of the prime minister. The sovereign, or the governor-general, exercises almost all their powers on the basis of advice from the prime minister and the other ministers. Ministers must be members of Parliament.
A government must have the confidence of a majority of the members of the House of Representatives in order to advise the governor-general and sovereign. If a government loses that confidence it must operate as a ‘caretaker government’ until a new government is formed. A caretaker government should avoid significant actions or policy decisions which have a long-term effect.
Elections must be held at least every three years and ‘snap elections’ (elections called earlier than expected) may be called. Since 1996 elections have been run on the basis of the mixed-member proportional (MMP) electoral system.
Official information is available to the public unless there is good reason why it should be withheld. This regime is policed by the ombudsman. The news media and commentators on the internet are able to disseminate and analyse news of political events, and policy and legal issues.
Only six provisions in New Zealand law are constitutionally entrenched, meaning they can only be changed by a vote of more than 75% of the House of Representatives or more than 50% at a referendum. They are contained in the Electoral Act 1993 (an one in the Constitution Act 1986) and relate to:
The Electoral Act 1993 is the only New Zealand statute which entrenches provisions of New Zealand law. The division of New Zealand into general electorates is entrenched but the Māori electorates are not. Entrenching the Māori seats was a policy of the Māori Party in the early 2000s.
Parliament consists of the House of Representatives and the sovereign. Parliament has the supreme power to make or unmake any law whatever, including:
Parliament also makes and unmakes governments themselves.
The House of Representatives has control of, and enforces, its own procedures, though in so doing it should observe the rights and freedoms in the New Zealand Bill of Rights Act 1990. The attorney general must draw the attention of the House of Representatives to provisions of draft legislation that may unjustifiably override those rights and freedoms.
The remuneration (pay) of members of Parliament is determined independently by the Remuneration Authority.
The executive branch of government ‘executes’ laws and policies. It is headed by cabinet, which collectively directs the powers of individual ministers to instruct politically neutral public servants. Cabinet directs the armed forces and police, except in relation to specific operational matters, and conducts foreign relations, including having the power to enter into international obligations. The solicitor general supervises indictable (serious) prosecutions.
The government’s powers are limited only by the need to retain the confidence of the House of Representatives and the need to act within the law, including the law of parliamentary appropriations of public money for expenditure.
The government is the primary initiator of proposals to Parliament for public expenditure or for changes to the law.
The judiciary is independent of the executive and Parliament. Judges are appointed by the executive, from the ranks of experienced lawyers, on a non-political basis. Judges may be removed by a parliamentary procedure initiated by the attorney general, which is difficult to invoke. Their pay is determined independently by the Remuneration Authority.
The Office of the Judicial Conduct Commissioner, which was established in 2005, deals with complaints about the conduct of judges. It cannot investigate complaints about judges’ decisions. In 2009/10, of the 148 complaints investigated that year (an additional 138 complaints had not been fully investigated by the end of that financial year), 125 were dismissed. The most common ground for dismissal was that the complaint was about the judge’s decision. Only 7 of the 148 complaints were referred for further investigation.
The judiciary, organised in a hierarchy of courts, makes decisions on court cases and has input into the executive government’s management of the court system. High Court judges have both statutory jurisdiction (the authority to make rulings on legal matters governed by legislation) and inherent common law jurisdiction (the power to act as they see fit to deal with issues before the court as long as it is not contrary to law). Court procedures are formulated by the judiciary, and by the Rules Committee (a statutory body made up of judges, lawyers, the solicitor general, the attorney general and the chief executive of the Ministry of Justice) with the consent of cabinet.
The judiciary makes common law through making individual legal decisions, and giving reasons for each decision. The judiciary interprets legislation using techniques they have developed as well as using techniques set out by Parliament.
If the government infringes the civil and political rights and freedoms in the New Zealand Bill of Rights Act 1990, it can be sued in court. A court may order the government to pay money in damages for infringements. If government infringement is clearly authorised by legislation, the judiciary may not strike down the validity of that infringement – though they may declare that it exists.
Both the government and the private sector are prohibited from discriminating on specified grounds of human rights in particular areas of activity. Complaints about the operation of government may be made to Parliament and a variety of complaints agencies, such as the ombudsmen, the privacy commissioner, the Human Rights Commission and the Independent Police Conduct Authority.
Local government is created by laws passed by Parliament. Local government, on a municipal (towns and cities) and regional level, can make its own regulations, especially in relation to environmental matters.
The New Zealand government regards itself as bound by the international obligations it enters into. International obligations can only be enforced in a New Zealand court if a New Zealand act of Parliament has been passed saying that it can be. New Zealand is also bound by, and participates in, the United Nations and the World Trade Organization. New Zealand is subject to decisions by international judicial bodies such as the International Court of Justice and the International Criminal Court.
Every constitution changes over time, and New Zealand’s constitution changes constantly – whenever there are changes in the laws, court judgments, instruments of government and constitutional conventions that make up its unwritten constitution.
In 2005 the government moved three versions of a supplementary order paper to change the Constitution Act 1986 in two ways. The changes were relatively technical and were supported by all political parties. Despite their significance, they received only six submissions from the public, which took 20 minutes to hear. They were the subject of little debate and went largely unnoticed.
Other than the entrenched provisions, constitutional statutes can be changed by a simple majority vote in the House of Representatives. Sometimes these changes are large and noticeable, such as the enactment of the system of mixed-member proportional (MMP) electoral system in the Electoral Act 1993, which followed two referendums, and the enactment of the New Zealand Bill of Rights Act 1990 after four years of debate. Some are controversial, such as abolishing New Zealanders’ right to appeal to the Judicial Committee of the Privy Council in United Kingdom by the Supreme Court Act 2003.
The constitutional convention that ministers may not publicly disagree with cabinte decisions is what gives cabinet its power. From 1999 coalition governments adopted ‘agree to disagree’ procedures to manage significant differences between coalition partners. Since 2005 there has been an additional innovation that a minor coalition party could be bound by cabinet unanimity in respect of some cabinet decisions, relating to the portfolios its own members held as ministers, but not in relation to other cabinet decisions.
Some changes to New Zealand’s constitutional statutes happen quickly. The Constitution Act 1986 itself was passed through its second reading, committee stages and third reading in a single evening in December 1986.
Changes to instruments of government such as the Cabinet manual or Parliament’s standing orders are generally easier and happen less publicly than changes to statutes.
Changes to constitutional conventions can be hard to notice. On the one hand, a change to a convention occurs simply with a change in practice. But it has to be a change in practice that is accepted and sustained over a lengthy period in order to qualify as a change in convention.
In a 2005 report the Constitutional Arrangements Committee of the House of Representatives said: ‘Although the characterisation of New Zealand’s constitutional history did not come easily to us, we rapidly agreed on the characteristic qualities of New Zealand’s approach to constitutional change through its modern history. We adopted the tag of “pragmatic evolution”. By this we mean New Zealanders’ instinct to fix things when they need fixing, when they can fix them, without necessarily relating them to any grand philosophical scheme.’1
How easily a nation’s constitution may change is important. It determines how easy it is to change the rules that govern the exercise of public power – for the better or for the worse.
New Zealand’s constitution is easy to change compared to other nations. That means that it is flexible and can adapt to changing circumstances quickly and easily. It also means that people may not notice when the constitution changes – in this way New Zealand’s constitution is relatively vulnerable to changes that allow the abuse of public power. Different New Zealanders have varied views on the trade-off between flexibility and vulnerability in their constitution.
The relationships between the Crown and Māori in New Zealand have been uneasy since first contact. In 1835 34 northern chiefs, encouraged by official British Resident James Busby, signed the Declaration of Independence, a document which asserted their rangatiratanga or sovereignty.
In 1840 British Consul William Hobson oversaw the drafting of the Treaty of Waitangi in English and Māori. More than 500 chiefs signed the treaty during the course of the year, but some refused to sign.
The British Crown asserted that it had sovereignty over New Zealand in May 1840. It is that assertion that is important legally, rather than the treaty itself, which was the moral or political justification used by the Crown for its assertion.
In 1839 prospective New Zealand Company settlers drew up a constitution in England before leaving for Port Nicholson (Wellington). After arriving in early 1840 they arranged a meeting with Māori chiefs in order to ratify and confirm the constitution. William Hobson saw this as a treasonous act and it prompted his assertion of the British Crown’s sovereignty over the whole of New Zealand based on the Treaty of Waitangi.
The English version of the Treaty of Waitangi guaranteed to Māori the full, exclusive and undisturbed possession of their lands, forests, fisheries and other properties, in exchange for ceding their sovereignty to the Crown.
The Māori version of the treaty, which was the version most Māori signed, preserved to Māori their rangatiratanga (literally ‘chieftainship’) over their lands, villages and all their taonga (treasures), in exchange for their gift to the Crown of their complete kāwanatanga (literally, ‘governorship’). In both versions the Crown guaranteed Māori its protection and conferred upon them the rights and privileges, or tikanga, of British subjects.
The Treaty of Waitangi represented an agreement between the Crown and many Māori chiefs to share power in some way. But exactly how was probably unclear in 1840, and remained unclear. As increasing numbers of settlers came to New Zealand, and promises in either version of the treaty went unfulfilled, conflict was inevitable. Fighting ensued, especially in the 1860s. The overall result was that the Crown’s sovereignty was confirmed, though in some areas of New Zealand that was as late as the 1880s and probably, in Te Urewera, the 1920s. It was also resented by many Māori.
Until the end of the 20th century the Treaty of Waitangi was virtually invisible to New Zealand law. However, the meaning and significance of the Treaty of Waitangi was reinterpreted by official institutions from 1973 to 1993. Parliament created the Waitangi Tribunal in 1975 and gave it the task of resolving the meaning of the treaty, treating each language version as of equal status. The Waitangi Tribunal issued four reports –from 1983 to 1986 – offering a general meaning of the treaty based on relationships and procedural fairness.
Parliament referred to the treaty in legislation from 1986. The courts adopted the tribunal’s meaning in a series of cases from 1987 to 1993. The executive government went along with that meaning.
The Treaty of Waitangi today occupies an uneasy, uncertain, place in New Zealand’s constitution. Its general meaning is commonly interpreted by official institutions and the law as being about relationships and procedural fairness. Despite these general principles, its meaning in particular cases can be unclear, and it is also unclear which institutions have the job of providing clarity.
New Zealand became a British colony in the wake of the UK’s Reform Act 1832 – a big step towards democracy in Britain – and successor acts in 1835 and 1836. The settlements established by the New Zealand Company from 1840 to 1850 were loud in their demands for democratic representation. New Zealand’s first Constitution Act was passed in 1846, partly in response to the settlers’ demands for representation. The act was suspended in 1848, partly because of concerns about representation, including the lack of Māori representation.
The first parliamentary election was held in 1853, and Parliament first sat in 1854. Its first two years of life were dominated by politicians’ ultimately successful demand that the governor be advised by ministers responsible to, and with the confidence of, the House of Representatives. The first significant exercise of Parliament’s power – to amend its own Constitution Act, in 1858 – was about electoral legislation.
The importance of voting continued to be emphasised in 19th-century New Zealand by the:
The most significant constitutional change in 20th-century New Zealand was the introduction of proportional representation – the mixed-member proportional (MMP) system in 1993. This changed constitutional dynamics by requiring political parties to negotiate with each other to form a government and to pass legislation, as it became very difficult for one party to gain a majority of seats in Parliament.
Continuing reliance on representative democracy has gone hand in hand with New Zealanders’ faith in the power of an elected Parliament to rule New Zealand.
Much of 19th-century constitutional power in New Zealand can be seen as Parliament asserting its power against other contenders, such as:
In 1985 a white paper examined the proposed introduction of a bill of rights into New Zealand law. The parliamentary select committee dealing with the paper received 431 submissions, some of which contained unusual suggestions. Twenty-five of them stated that God should be acknowledged as the ultimate source of rights.
Westminster constitutional theory (based on the Westminster system of democratic parliamentary government in the UK) confers ‘sovereignty’ on Parliament – the power to make or unmake any law whatever. With one house of Parliament, no federalism (separate states), and no ability of the judiciary to strike down legislation, parliamentary sovereignty is stronger in New Zealand than in any other Westminster democracy. However, while Parliament is sovereign in New Zealand, for most of the 20th century its power was, in reality, exercised by the executive branch of government – the cabinet.
The executive branch of government, led by cabinet, executes or administers the law. It is the branch of government which does things, rather than passing or interpreting legislation (as Parliament and the courts do). The executive branch of government has always been strong in New Zealand, from the time when the governor was the only government.
Parliament took power from the executive in the 1850s. New Zealand’s cultural tendency to authoritarian government was evident in the 19th century, exemplified when Richard Seddon, popularly known as King Dick, was premier from 1893 to 1906. But, in the 20th-century, executive administrations came to dominate Parliament and were able to control the power of parliamentary sovereignty.
The existence of a stable two-party system from the 1930s to the 1990s meant that a single political party always had majority support in the small House of Representatives. A handful of ministers could dominate cabinet, cabinet could dominate the government caucus, and the government caucus could dominate the House of Representatives.
Early examples of Parliament delegating huge power to the executive were:
The nation seemed relatively comfortable with the extent of executive power in New Zealand for most of this period, but abuses during Prime Minister Robert Muldoon’s 1975–84 administration led to a reaction.
Immediately after the 1984 election the in-coming Labour government wanted to devalue the New Zealand currency on the advice of Treasury and the Reserve Bank – New Zealand was in the midst of a currency crisis at the time. However, the out-going prime minister, Robert Muldoon, was reluctant to act. This caused a constitutional crisis because Muldoon initially refused to act according to constitutional convention. Muldoon eventually agreed to devaluation. Government caretaker conventions were clarified in the wake of this incident.
In the 1980s and early 1990s a series of measures limited the scope of executive power:
Finally, and most significantly, the adoption of the mixed-member proportional (MMP) electoral system, following a referendum in 1993, ended the reign of single-party majority governments in New Zealand. Since then parties have had to negotiate with other parties to form a government and to pass each piece of legislation.
James, Colin, ed. Building the constitution. Wellington: Institute of Policy Studies, Victoria University of Wellington, 2000.
Joseph, Philip A. Constitutional and administrative law in New Zealand. 3rd ed. Wellington: Thomson Brookers, 2007.
Palmer, Geoffrey, and Matthew Palmer. Bridled power: New Zealand's constitution and government. 4th ed. Melbourne: Oxford University Press, 2004.
Palmer, Matthew S. R. ‘New Zealand constitutional culture.’ New Zealand Universities Law Review 22 (2007): 565–597.
The website of New Zealand’s governor-general.
The website of New Zealand’s governor-general.
The website of New Zealand’s governor-general.
The 2005 report of Constitutional Arrangements Committee, which reviewed New Zealand’s constitutional arrangements.
This government briefing note looks at the history and future of New Zealand’s constitution (PDF 408KB).
This article by Matthew S. R. Palmer, previously published in the Public Law Review 17 (2006), includes an extensive list of constitutional sources (PDF 631KB).