New Zealand’s MMP system gives voters two separate choices: the party vote helps determine how many seats each party gets in Parliament, while the electorate vote selects the local candidate who represents the voter’s electorate. The party vote shapes overall representation; the candidate with the most electorate votes wins the local seat.
What each vote chooses
| Vote | You choose | Main result |
|---|---|---|
| Party vote | A political party | Helps determine the total number of seats that party receives in Parliament. |
| Electorate vote | A candidate standing in your electorate | Determines which candidate wins that electorate’s seat. |
These are independent choices: you can vote for one party and for a candidate from another party. Neither vote replaces the other. The Electoral Commission describes the party vote as largely deciding each party’s total seats, while the candidate with the most electorate votes becomes the electorate MP (What is MMP?; How are MPs elected?).
How the two votes work together under MMP
New Zealand’s Mixed Member Proportional (MMP) system aims to make each qualifying party’s total representation broadly reflect its share of the nationwide party vote. A party’s electorate winners count toward that total first. If its party-vote entitlement gives it more seats than it won electorates, candidates from its ranked party list fill the remaining seats.
Party vote: sets the broad seat entitlement
Once parties that qualify for seats are identified, seats are allocated using the Sainte-Laguë formula. In the Electoral Commission’s illustrative example, a party receiving 30% of the party vote gets about 36 of 120 seats. If 20 of its candidates win electorates, those MPs take 20 seats and 16 list candidates fill the balance. This is an explanation of the system, not a forecast for any election.
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Electorate vote: picks the local MP
The electorate contest is a winner-takes-one-seat race. The candidate with more votes than any other candidate wins; they do not need more than half of all electorate votes. The electorate vote does not set a party’s proportional share, but electorate wins count toward the seats the party receives overall.
When a party qualifies for seats
A party qualifies for seats if it receives at least 5% of the nationwide party vote or wins at least one electorate seat. The electorate-seat route is an exception to the 5% threshold, so a party below 5% is not automatically excluded from Parliament.
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The Electoral Commission’s 2012 review gives historical examples from the 2008 election: the Greens received 6.7% of the party vote and won nine of 122 seats; ACT received 3.6% and won an electorate, qualifying for five seats; New Zealand First received 4.1% and won no electorate, so it received no seats. These figures describe the 2008 election, not current party results (Electoral Commission, 2012 review of MMP).
What an overhang means
If a party wins more electorate seats than its party-vote entitlement would normally give it, it keeps those electorate seats. The extra seats are called an overhang, and Parliament expands by that number for the term rather than removing electorate MPs.
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The Electoral Commission says Parliament had 123 MPs after the 2023 General Election because of an overhang. That count is tied to that election; it is not a permanent size for Parliament (How are MPs elected?).
A narrow counting exception
If someone casts an electorate vote in an electorate where they are not eligible to vote, that electorate vote is disallowed, but the party vote is still counted as “Party Vote Only,” according to the Electoral Commission’s official-counting guidance (Vote counting and results). This is an eligibility edge case, not a rule requiring voters to choose the same party and candidate.
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Explore how party votes and electorate wins affect seats
The Electoral Commission’s MMP seat allocation calculator lets readers explore how party-vote totals and assumed electorate wins interact. The page was updated in September 2026. Its results are scenarios based on inputs, not predictions of an election outcome.
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