Explainer-How does New Zealand's electoral system work and does it favour coalitions?


New Zealand First leader Winston Peters reacts as he walks past members of the media at Parliament House in Wellington, New Zealand, September 22, 2026. REUTERS/Marty Melville

WELLINGTON, Sept 23 (Reuters) - New Zealand 54th parliament sits ⁠for its final time this week ahead of a Nov. 7 election.Polls indicate that no one party will emerge as ⁠a clear winner with neck-to-neck support for bothleft and right blocks.

The winning group would be decided based on a mixed-member ‌proportional (MMP) electoral system, which has made coalitions the norm in New Zealand since it was introduced three-decades ago.

WHAT IS MMP?

New Zealand switched from a British first-past-the-post system, in which the top finisher in each electoral district wins the seat, to MMP on the recommendation of a commission addressing concerns that smaller parties were being left out.

All ​governments under MMP have been coalitions of the centre-left Labour or centre-right National with ⁠the support of smaller parties, except in 2020 when ⁠the Labour government swept to power after successfully managing the early months of the COVID-19 outbreak. Originating in Germany, MMP has been ⁠adopted, ‌sometimeswith modifications, in countries including Bolivia, Lesotho, South Korea and Thailand.

HOW IT WORKS

Under MMP, voters cast two votes: one for their preferred constituency candidate and one for a party.

The candidate with the most votes wins and becomes an MP, while the party vote decides ⁠how many seats each party gets in parliament. The winning candidates of the ​country's 71 constituencies take their seats automatically, ‌while the remaining seats are filled from party lists, allocated to match each party’s share of the nationwide vote. There ⁠are expected to be about ​49 party list seats in this election, though that number can change.

Political parties must get at least 5% of the party vote or win at least one electorateseat to get any seats in Parliament.

A party or coalition can form a government when it secures a majority in the single-chamber parliament, usually at ⁠least 61 of 120 seats.

KINGMAKERS

Due to the nature of the MMP electoral ​system that was first used in New Zealand in 1996, minor parties often play a decisive role in forming the government.

New Zealand First has been the most prominentkingmaker, backing National after the 1996 election and Labour after the 2017 election. Te Pati Maori has also helped larger parties govern, ⁠supporting National-led governments after the 2008, 2011 and 2014 elections.

In this election, the centrist Opportunity Party could also become pivotal if it reaches the 5% party-votethreshold or wins an electorate seat.

The 2017 election showed how the largest party does not always end up in power. National won 56 seats, more than Labour's 46, but was unable to assemble a majority. Labour formed a government through a coalition with New Zealand ​First and a confidence-and-supply agreement with the Green Party.

QUIRKS

Parliament normally has 120 seats, but extra seats ⁠can be added when a party wins more electorate seats than its share of the nationwide party vote would otherwise entitle it to. This ​happened after the 2023 election, when TePati Māora won six electorates while receiving 3.1% of ‌the party vote. Polls indicate this could happen again in 2026.

In ​the system, seven of the electorate seats are Maori electorates, reserved for voterswho choose to enrol on the Maori electoral roll. Maori voters can choose to enrol in a general electorate.

(Reporting by Lucy Craymer; Editing by Praveen Menon and Michael Perry)

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