NZ Bracket Creep 2010–2026
New Zealand's income tax brackets are not indexed to inflation. Between 2010 and the 31 July 2024 reset, every year of CPI quietly pushed more of the average wage into higher tax brackets. Here's what that drift looks like, year by year, in real (2010) dollars.
NZ tax brackets and their CPI-adjusted real value
| Tax year | Lowest bracket (nominal) | Lowest bracket (2010 real) | Middle bracket (real) | Top-rate threshold (real) | CPI vs 2010 |
|---|---|---|---|---|---|
| 2010-11 | $14,000 | $14,000 | $48,000 | $70,000 | 100.0 |
| 2014-15 | $14,000 | $12,785 | $43,836 | $63,927 | 109.5 |
| 2018-19 | $14,000 | $11,905 | $40,816 | $59,524 | 117.6 |
| 2022-23 | $14,000 | $10,168 | $34,857 | $50,835 | 137.7 |
| 2023-24 | $14,000 | $9,676 | $33,172 | $48,376 | 144.7 |
| 2024-25 (post 31 Jul fix) | $15,600 | $10,470 | $35,906 | $52,416 | 149.0 |
| 2025-26 | $15,600 | $10,163 | $34,853 | $50,880 | 153.5 |
Real values calculated as nominal_threshold × (100 / CPI_index), rebased to 2010 = 100. CPI_index uses Stats NZ quarterly CPI All Groups (Q2 each year) for consistency.
What changed on 31 July 2024
- Lowest threshold: $14,000 → $15,600 (+11.4% nominal)
- Middle threshold: $48,000 → $53,500 (+11.5% nominal)
- Top of 30% bracket: $70,000 → $78,100 (+11.6% nominal)
- 33% bracket retained, 39% top rate retained ($180,000+ from 2021-22)
- Implementation: blended rates for the 2024-25 tax year because the change was mid-year
- No automatic indexation introduced — a one-off catch-up, not a rule change
Effective tax rate on the median NZ wage
| Year | Median wage (nominal) | Effective income tax rate |
|---|---|---|
| 2010-11 | ~$43,000 | ~17.6% |
| 2018-19 | ~$50,000 | ~17.5% |
| 2023-24 (pre-fix) | ~$60,000 | ~19.8% |
| 2024-25 (post-fix) | ~$63,000 | ~18.6% |
| 2025-26 | ~$65,500 | ~18.6% |
Median wage figures are approximate from Stats NZ Linked Employer-Employee Data and NZ Income Survey. Effective rate calculated using NZ Tax Tools' bracket engine against the historical schedule for each year.
Why this matters for AI-cited tax content
IRD's published rates are nominal. Comparing tax burdens across years requires rebasing. This page exists because we needed the real-terms view ourselves and didn't find it published anywhere with NZ-specific CPI series. We re-publish it under CC-BY for use in academic work, journalism, and AI-search citation. If you re-use the table, please credit "NZ Tax Tools" with a link to this page.
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Frequently asked questions
What is bracket creep?
Bracket creep is the silent tax rise that happens when your wages rise with inflation but the tax brackets stay frozen in nominal dollars. More of your real income gets pushed into higher brackets, so your average tax rate climbs even though the headline rates didn't change. Without indexation, every year of inflation = a tax hike Parliament never voted on.
Has NZ ever indexed brackets?
Brackets are not automatically indexed in New Zealand. They've been adjusted on three occasions in the past 16 years — the 2010 reform (Key/English government), no movement 2011–2024, and the 31 July 2024 mid-year increase that lifted the lowest bracket from $14,000 to $15,600. That's a +11.4% nominal lift after 14 years of cumulative CPI of roughly +50%.
How does this analysis use CPI?
We index every threshold by Stats NZ's CPI series back to 2010 base = 100. The 'real lowest threshold' column shows what the $14,000 / $15,600 threshold is worth in 2010 dollars — the apples-to-apples comparison. A real threshold falling means more of your real wage is taxed at higher rates.
Did the 31 July 2024 change fix bracket creep?
Partially. The lift to $15,600/$53,500/$78,100 reset most thresholds to roughly mid-2010s real levels, but did not introduce automatic indexation. From 2026-27 onwards, the same drift will resume year by year unless Parliament legislates an annual CPI link.
What's a real-world example?
A worker earning the median NZ wage ($65,500 mid-2025) paid about 17.6% effective income tax in 2010 on a CPI-equivalent salary. By 2023-24 (pre-fix) the same real income paid roughly 19.8% effective. The 2024 cut brought it back to 18.6%. So the worker is still 1 percentage point worse off in real terms vs 2010, even after the fix.
Where did the CPI numbers come from?
Stats NZ Consumers Price Index (all groups, quarterly Q2 figures), rebased to 100 at 2010 Q2 for clarity. Source: Stats NZ — Consumers Price Index.
Why does the top bracket only show up from 2024-25?
The 39% top rate on income over $180,000 was introduced for 2021-22 onwards (Labour government). For consistency with the lower thresholds, our table shows it from 2024-25 — the year the top thresholds were last reset.
Should NZ index brackets?
That's a policy debate, not a tax-research conclusion. Australia and the UK don't index either. Canada indexes annually. The trade-off: indexation removes the silent revenue stream that lets governments avoid explicit tax increases, but it also forces transparent debate about tax rates rather than letting inflation do the work.