New Zealand election 2026: How the MMP voting system works and why smaller parties could decide who forms government

New Zealand’s 54th Parliament is holding its final sitting this week before voters head to the polls on November 7, with neither the left nor the right commanding a decisive lead.

That makes New Zealand’s electoral system particularly important. Unlike elections where the party winning the most constituencies can expect to govern, New Zealand uses Mixed Member Proportional representation, or MMP, a system designed to make the composition of Parliament broadly reflect how people vote nationwide.

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The result is that elections are rarely just about which major party finishes first. Smaller parties can end up holding the votes needed to decide who forms the next government.

What is MMP?

New Zealand abandoned the traditional first-past-the-post system in favour of MMP in the 1990s after concerns that smaller parties were not being adequately represented.

Under first-past-the-post, the candidate receiving the most votes in an electorate wins the seat. MMP keeps that local contest but adds another layer aimed at making Parliament more proportional to the nationwide party vote.

Since MMP was first used in a New Zealand general election in 1996, coalition or support arrangements have become a regular feature of government formation. The major exception came in 2020, when Labour secured enough seats to govern alone after its landslide election victory.

Versions of MMP, which originated in Germany, are also used in several other countries.

How does it work?

New Zealanders get two votes.

The electorate vote is cast for the candidate they want to represent their local area. The candidate receiving the most votes becomes the electorate MP.

The second, and crucial, vote is the party vote. This largely determines how many seats each political party receives in Parliament.

There will be 71 electorates in the 2026 election: 64 general electorates and seven Māori electorates. Candidates who win those contests enter Parliament directly. The remaining places in the normally 120-seat Parliament are allocated from party lists to bring each qualifying party’s overall representation roughly in line with its share of the party vote.

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To qualify for this proportional allocation, a party generally needs at least 5% of the nationwide party vote or must win an electorate seat.

A party or group of parties needs a parliamentary majority to govern. In a standard 120-seat Parliament, that usually means reaching at least 61 seats.

Why smaller parties matter

That arithmetic is why minor parties can become central to deciding who governs.

New Zealand First has played that role before. It supported a National-led government following the 1996 election and later sided with Labour after the 2017 election.

The 2017 result is also a useful example of why simply finishing first does not guarantee power under MMP. National emerged with 56 seats, ahead of Labour's 46, but could not put together the numbers required to govern. Labour ultimately formed a government with New Zealand First, backed by a confidence-and-supply agreement with the Greens.

The Opportunity Party could also become important after the November election if it clears the 5% party-vote threshold or captures an electorate seat.

And then there are overhang seats

There is another wrinkle.

New Zealand's Parliament normally has 120 seats, but it can grow larger if a party wins more electorate seats than its share of the party vote would otherwise give it.

Those additional places are known as overhang seats.

The system came into play after the 2023 election, when Te Pāti Māori won six electorate seats despite receiving just over 3% of the party vote. The amended official result produced a 122-seat Parliament, and the current Parliament subsequently grew further.

The 2026 election could produce another overhang, depending on the combination of electorate victories and party votes.

Seven of this year's 71 electorates are Māori electorates. Māori voters can choose whether to enrol on the Māori roll or the general roll, although the electoral roll they are enrolled on determines which electorate contest they vote in.

All of that means November 7 may not deliver an immediate, straightforward answer to who governs New Zealand. Under MMP, the nationwide party vote, electorate victories and the negotiating power of smaller parties all matter once the ballots are counted.