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For official outcomes, use the Electoral Commission’s New Zealand Election Results archive. For a quick comparison of polls taken just before an election, use Research Association New Zealand’s (RANZ) Political Polling tables. Those tables cover the final week before polling day for the last six elections—not every poll throughout each campaign—so a full historical timeline requires checking original poll releases.
Where to find election results and historical polls
Start with the official result
The Electoral Commission’s New Zealand Election Results archive is the primary source for official outcomes. It lists general elections from 1996 onward and links to results before 1994, as well as by-elections and referenda. The Commission’s Participation in voting page links to results, turnout statistics, election reports, and voter and non-voter surveys; its Election reports page indexes reports for recent general elections.
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Use RANZ for final-week comparisons
RANZ’s Political Polling resource presents tables for the last six elections. Its poll tables include polls conducted within a week of election day, alongside election results, and a separate table shows percentage-point differences. This is useful for assessing late-campaign estimates, but it is not a complete archive of campaign polling.
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The available sources do not establish one comprehensive public archive of every New Zealand political poll. For polls from earlier in a campaign, use the RANZ tables as a starting point, then locate each named poll in its original media or pollster release. Verify its fieldwork dates and technical notes there; do not assume that similarly named polls form one continuous series.
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How to interpret a historical poll
Read it as a dated snapshot
A poll records stated preferences gathered during a particular fieldwork period. It describes opinion at that time; it is not automatically a forecast of election-day results. RANZ’s endorsed guide describes the purpose as showing “how the election could go if held at the time the poll was conducted.” Satherley, Greaves and Sporle’s 2023 review notes that many polling companies explicitly say their polls are not intended to predict the outcome.
Check who was polled and how
Before comparing figures, record the polling company, sponsor, fieldwork dates, sample size, survey mode, target population, and weighting method where disclosed. Check whether the published figures represent all eligible adults, enrolled voters, likely voters, decided respondents, or another group. Also note how undecided respondents and people unwilling to state a preference were handled: excluding them changes what the headline percentages represent. Publication date alone is not enough; the responses may have been collected earlier, potentially across a period that included significant news.
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The 2023 review names Verian (formerly Kantar Public/Colmar Brunton), Reid Research, Roy Morgan, Curia, and Talbot-Mills (formerly UMR) among New Zealand’s main polling companies. The pollster and its sponsor both matter, since one company may conduct polls for different organisations.
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Most political polls discussed in this context measure party-vote intention, not electorate-vote preference. Under MMP, party votes determine proportional seat allocation, while electorate victories also shape representation. A party can win more electorate seats than its party-vote share would entitle it to, creating an overhang. Satherley, Greaves and Sporle give the 2008 Māori Party as an example: its 2.4% party vote would have entitled it to three seats, but five electorate wins produced a two-seat overhang. A party-vote percentage by itself is therefore not a seat count. Compare party-vote estimates with official party-vote results, and electorate polling with electorate results.
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Keep uncertainty and small differences in perspective
Do not treat a small lead or movement between polls as decisive without considering sample size, uncertainty, mode, weighting, and pollster-specific methods. There is no single margin-of-error figure established for every historical poll in these sources; consult the technical note for the particular poll. Where polls overlap in fieldwork dates, treat them cautiously as snapshots of similar periods rather than independent readings of a changing trend.
What the historical comparisons show
Final polls are not the same as election results
RANZ’s 2020 retrospective provides a clear example. In both listed final-week polls, Labour was at 46% and National at 31%; the election-night figures in the same table were Labour 49.1% and National 26.8%. The table also lists ACT at 7% and 8% in the two polls versus 8.0% in the result, the Greens at 6% and 8% versus 7.6%, and NZ First at 3% in both polls versus 2.7%.
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In October 2020, RANZ Fellow and Political Polling spokesperson Murray Campbell noted that both final polls underestimated the gap between Labour and National. RANZ reported that almost two million people voted before election day, compared with 690,000 on the day itself, and presented early voting as a possible contributor: some people had already voted by the time the final polls were fielded, and their stated intention might differ from their completed vote. That is a proposed explanation, not proof that early voting alone caused the miss.
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Look at patterns across elections, not one result alone
Satherley, Greaves and Sporle’s 2023 article reports that between 2002 and 2017 the average party-vote difference between polls and election results was generally between 1 and 2 percentage points, attributing the underlying comparison to RANZ. The same article notes that 2020 final polls overestimated National by 4 percentage points and underestimated Labour by 3 percentage points. A historical average provides context, but it does not guarantee accuracy in any particular election.
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How to compare polls or averages responsibly
- Compare polls measuring the same thing: party vote with party vote, electorate vote with electorate vote, and consistent party categories.
- Record each poll’s sponsor, pollster, fieldwork dates, sample, target population, mode, weighting, and treatment of undecided respondents where those details are available.
- Note major developments during the fieldwork period, but do not assume that a leadership change or news event explains a shift without supporting evidence.
- Distinguish raw poll results from an average or seat projection. For an average, disclose which polls it includes and how it weights them.
- Separate the observed result from explanations for it. A poll miss is evidence of a difference between estimates and outcome, not by itself proof of late opinion change, turnout effects, or response bias.
Methods can be version-specific. For example, NZ Polls’ Average v1.0 methodology, published 1 September 2026, uses the six most recent eligible polls and weights them for recency and sample size. It says the model does not account for house effects, mode effects, correlated errors, or electorate-level swings. Treat that as one published approach, not an official archive or an Electoral Commission forecast.
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