HIGHLIGHTS
• The average of RBNZ core inflation measures sits at 2.4%, within the 1-3% target band but above the 2% midpoint
• Headline CPI jumped to 3.1% in the December 2025 quarter, but core measures have remained more stable
• The RBNZ held the OCR at 2.25% in February 2026, with rate cuts now off the table according to Westpac
• One-year-ahead inflation expectations rose 20 basis points to 2.59%, suggesting expectations are drifting upward
• Core inflation's stickiness above 2% is a key reason the RBNZ is unlikely to resume cutting rates soon


While New Zealand's headline inflation grabbed attention by surging to 3.1% in late 2025, a quieter but arguably more important story is playing out beneath the surface. Core inflation — the measure that strips out volatile items like food and energy to reveal underlying price pressures — remains stubbornly anchored above the Reserve Bank of New Zealand's 2% target midpoint.

At an average of 2.4% across multiple measures, core inflation in New Zealand sits comfortably within the RBNZ's 1-3% target band. But for a central bank that has explicitly stated its goal of returning inflation to 2%, the persistence of core measures in the upper half of the band is a source of concern — and a key reason why further interest rate cuts appear to be off the table.

For investors, core inflation is arguably the most important inflation metric to watch. It signals where monetary policy is heading, how long interest rates will stay at current levels, and whether the inflation challenge is genuinely receding or merely being masked by volatile component movements.

What Is Core Inflation and Why Does It Matter?
Core inflation is designed to measure the persistent, underlying trend in price changes by excluding items that experience large, temporary price swings. While there is no single universally agreed core inflation measure, the RBNZ tracks several complementary approaches to build a comprehensive picture.

The most commonly referenced core measures include trimmed mean inflation (which removes the most extreme price changes from both tails of the distribution), weighted median inflation (the price change at the 50th percentile of the distribution), and the RBNZ's sectoral factor model (which extracts the common inflation signal across different sectors).

Core inflation matters because it provides a cleaner signal of where inflation is heading over the medium term. Headline CPI can be distorted by temporary factors — a drought that spikes vegetable prices, a geopolitical shock that sends petrol costs surging, or a seasonal swing in airfares. Core measures look through this noise to identify the persistent component that monetary policy should respond to.

For the RBNZ's Monetary Policy Committee, core inflation is a critical input into OCR decisions. If core inflation is declining toward 2%, the Committee can be more confident that headline inflation will follow. If core inflation is sticky, it suggests that underlying price pressures are not fully resolved, regardless of what headline CPI is doing.

Where Core Inflation Stands in 2026
As of the most recent data, the average of the RBNZ's suite of core inflation measures sits at 2.4%. This represents a modest decline over the past year, but the pace of improvement has stalled. Most measures remain clustered in the 2.2-2.6% range — within target but clearly above the midpoint.

The pattern is important: after declining steadily from peak levels above 5% in 2022-2023, core inflation's descent has flattened out. The earlier sharp falls — driven by the unwinding of pandemic-era supply disruptions and the dampening effect of aggressive rate hikes — have given way to a more gradual, grinding disinflation that appears to have stalled in the upper portion of the target band.

This stickiness is not unique to New Zealand. Central banks globally are finding that the last mile of disinflation — bringing inflation from around 2.5% to exactly 2% — is proving significantly harder than the initial decline from peak levels.

Headline vs. Core: Why the Gap Matters
The divergence between headline CPI at 3.1% and core inflation at 2.4% tells an important story about the nature of current price pressures. The gap suggests that approximately 0.7 percentage points of headline inflation is being driven by volatile components rather than broad-based underlying price pressures.

The main volatile drivers pushing headline above core include electricity prices (up 12.2%), which reflect specific energy market dynamics rather than generalised inflation. Petrol and transport costs, driven by geopolitical supply disruptions. Seasonal food price movements, which can swing significantly quarter to quarter.

For the RBNZ, this gap provides some comfort. If the volatile components moderate — oil prices stabilise, the energy market adjusts, seasonal food patterns normalise — headline inflation should retreat toward core. However, if volatile costs remain elevated long enough, they risk feeding into core measures through second-round effects on wages and expectations.

What's Keeping Core Inflation Sticky?

Services Inflation
Services inflation remains the primary driver of sticky core price pressures. Unlike goods prices, which can adjust relatively quickly as supply chains normalise, services prices are heavily influenced by labour costs. With unemployment still relatively low and the minimum wage rising (albeit modestly to $23.95/hour), services providers — from restaurants and hairdressers to professional services firms — face ongoing wage cost pressures that are passed through to consumers.

Services make up a large share of New Zealand's CPI basket, meaning persistent services inflation has an outsized impact on core measures. Until services inflation declines meaningfully, core inflation is unlikely to return to 2%.

Insurance and Rates
Insurance premiums (up 10%) and local authority rates (up 12.2%) represent sticky, non-discretionary cost categories that are captured in core inflation measures. Unlike commodity-driven price swings, these increases reflect structural factors — climate risk repricing and infrastructure investment needs — that are unlikely to reverse quickly.

Expectations Drift
The RBNZ's February 2026 Survey of Expectations revealed a concerning trend: inflation expectations are drifting upward rather than anchoring at 2%. One-year-ahead expectations rose 20 basis points to 2.59%, while two-year-ahead expectations increased to 2.37%.

Rising expectations can become self-fulfilling. If businesses expect 2.5% inflation, they set prices accordingly. If workers expect 2.5% inflation, they demand corresponding wage increases. This expectations channel is one of the key risks that could prevent core inflation from returning to the 2% midpoint.

RBNZ Policy Implications
Core inflation's stickiness above 2% has significant implications for the RBNZ's monetary policy trajectory. The central bank held the OCR at 2.25% in February 2026 and signalled confidence that inflation will return to the midpoint over the next 12 months.

However, several major bank economists are less sanguine. Westpac has explicitly stated that RBNZ rate cuts are off the table as core inflation stays sticky. The bank argues that with core measures showing limited progress toward 2%, the case for further easing has evaporated.

Market pricing supports this view. OCR expectations from the RBNZ's February survey point to rates rising to 2.58% by December 2026, suggesting the market believes the next move is more likely to be a hike than a cut.

For the RBNZ, the core inflation picture creates a holding pattern. Rates are not restrictive enough to accelerate disinflation, but the fragile economic recovery argues against tightening. This suggests the OCR is likely to remain at or near 2.25% through mid-2026, with the direction of the next move depending on whether core inflation resumes its decline or continues to drift sideways.

Implications for Investors

Fixed Income
Sticky core inflation is negative for bond investors, particularly those holding longer-duration instruments. If core inflation remains above 2%, the RBNZ is unlikely to cut rates, removing a key catalyst for bond price appreciation. Inflation-linked bonds may offer better risk-adjusted returns in this environment.

Equities
For equity investors, the core inflation picture is mixed. On one hand, stable rates support valuations by keeping discount rates unchanged. On the other, if the RBNZ eventually needs to hike, the equity market could face a repricing. Companies with strong pricing power — those able to pass through cost increases — are likely to outperform in a sticky inflation environment.

Property
The property market is directly sensitive to the interest rate outlook. With rate cuts off the table and potential hikes being discussed, mortgage rate reductions may stall, limiting the fuel for house price appreciation. The BNZ's forecast of 4% house price growth and ANZ's more conservative 2% projection both assume a benign rate environment — any hawkish RBNZ shift would pressure these estimates downward.

Currency
A higher-for-longer rate environment in New Zealand, relative to other central banks, could support the NZ dollar. However, the currency is also influenced by global risk sentiment, commodity prices, and the China growth outlook, making the relationship between core inflation and currency movements complex.

Questions Investors Are Asking About NZ Core Inflation

  • What is core inflation in New Zealand right now?
    The average of the RBNZ's core inflation measures is approximately 2.4% as of early 2026, within the 1-3% target band but above the 2% midpoint.
  • Why is core inflation important for investors?
    Core inflation drives central bank rate decisions. Sticky core inflation means rates are less likely to be cut, affecting bond prices, equity valuations, mortgage rates, and currency movements.
  • Will the RBNZ cut rates again in 2026?
    Rate cuts appear off the table for now. Westpac has stated that sticky core inflation has eliminated the case for further easing, and market pricing suggests the OCR may rise to 2.58% by December 2026.
  • What is the difference between headline and core inflation?
    Headline CPI includes all items (currently 3.1%). Core inflation strips out volatile components like food and energy, revealing underlying price trends (currently 2.4%). The 0.7% gap suggests volatile factors are temporarily boosting headline figures.
  • Is core inflation falling in New Zealand?
    Core inflation has declined from peak levels above 5% in 2022-2023 but has stalled at around 2.4%. Most measures remain stubbornly above the RBNZ's 2% target midpoint.
  • What's driving sticky core inflation in NZ?
    Persistent services inflation (driven by labour costs), rising insurance premiums (up 10%), council rates (up 12.2%), and drifting inflation expectations (1-year ahead now at 2.59%) are the main factors keeping core inflation elevated.
  • How does NZ core inflation compare globally?
    New Zealand's core inflation experience mirrors that of many developed economies, where the last mile of disinflation — from around 2.5% to 2% — is proving harder than the initial decline from peak levels.
  • What would cause core inflation to fall to 2%?
    A meaningful decline in services inflation, stabilisation of insurance and rates increases, anchoring of inflation expectations at 2%, and potentially a period of weaker economic activity would all help push core inflation toward the midpoint.
  • Should investors be worried about reflation in NZ?
    The risk is real but not the base case. If inflation expectations continue drifting higher and core measures fail to improve, the RBNZ may need to tighten policy, which would have significant implications across asset classes.
  • When will we get the next core inflation update?
    Core inflation measures are updated quarterly alongside the CPI release. The next update, covering the March 2026 quarter, is expected on April 21, 2026.

Conclusion
Core inflation in New Zealand tells a nuanced story that headline CPI alone cannot capture. At 2.4%, underlying price pressures are contained but not conquered. The stalling of the disinflation trend in the upper half of the target band has real consequences for monetary policy, asset prices, and the broader economic outlook.

For the RBNZ, core inflation's stickiness constrains policy options. Rate cuts are off the table, but the fragile recovery argues against hikes — creating an uncomfortable holding pattern that could persist through much of 2026. For investors, this environment demands careful attention to inflation data releases, expectations surveys, and RBNZ communications.

The key question for the remainder of 2026 is whether core inflation resumes its descent toward 2% or becomes entrenched above the midpoint. The answer will determine not just monetary policy direction but the trajectory of asset prices across New Zealand's equity, bond, property, and currency markets.