Prices change. A loaf of bread that cost $3 a decade ago might cost $4.50 today. A rental that was $350 a week five years ago might now be $550. This general rise in prices over time is called inflation — and it is one of the most important forces shaping the everyday economic lives of New Zealanders.
Inflation is not simply "things getting more expensive." It is a sustained, widespread rise in the price level — affecting most goods and services across most of the economy. Understanding it means understanding why prices rise, how it is measured, who it hurts most, and how New Zealand manages it.
Why Prices Rise
At its most basic level, a price rises when demand for something outpaces supply. When more people want something than is available, sellers can charge more. When supply is abundant and demand is weak, prices tend to fall or stay flat.
Inflation — a general rise across many prices simultaneously — typically reflects one of two broad forces:
Demand-pull inflation occurs when spending in the economy is strong — people have more money to spend, businesses are operating at full capacity, and demand outstrips the economy's ability to supply goods and services. Prices rise because buyers are willing to pay more and sellers can charge it. The post-COVID economic boom of 2021 was partly demand-pull — government support payments and pent-up consumer spending pushed demand strongly upward.
Cost-push inflation occurs when the costs of producing goods and services rise — driving prices up through the supply side rather than the demand side. When global oil prices surge, transport costs rise and flow through into the price of almost everything. When wages rise strongly, business costs increase and are often passed on to customers. When supply chains are disrupted — as they were during COVID-19 — scarcity drives up the cost of imported goods. New Zealand's current inflation is partly cost-push — electricity prices surged 12.2 percent in the year to December 2025, council rates rose 8.8 percent, and global oil prices jumped following the 2026 Middle East conflict.
Expectations also play a role. When people expect prices to keep rising, they demand higher wages to compensate, and businesses raise prices pre-emptively. This creates a self-fulfilling cycle. Keeping inflation expectations anchored — convincing households and businesses that inflation will remain low and stable — is one reason central banks guard their inflation targets carefully.
How Inflation Is Measured: The CPI
New Zealand's official inflation measure is the Consumers Price Index — CPI, produced by Statistics New Zealand — Tatauranga Aotearoa. The CPI tracks the price of a fixed basket of 598 goods and services that a typical New Zealand household purchases, grouped into 11 categories: food; housing and household utilities; household contents and services; health; transport; communication; recreation and culture; education; insurance and financial services; alcoholic beverages and tobacco; and clothing and footwear.
To compile the CPI, Statistics New Zealand visits around 2,800 shops and service providers around the country each quarter to record prices. Those prices are weighted according to how much a typical household spends on each category — housing costs, for example, receive a larger weight in the index than clothing, reflecting their greater share of household budgets.
The CPI is published quarterly — approximately 12 working days after the end of each quarter. The annual CPI figure — the percentage change in the index compared with the same quarter a year earlier — is the headline inflation rate that is reported in the news and used by the Reserve Bank to assess monetary policy settings.
As of the December 2025 quarter, annual CPI inflation was 3.1 percent — slightly above the Reserve Bank's target ceiling of 3 percent. The biggest contributors were electricity prices (up 12.2 percent — the highest since March 1989), local authority rates and payments (up 8.8 percent), and rent (up 1.9 percent).
Tradables and Non-Tradables Inflation
Not all inflation is the same kind — and understanding the distinction between tradables and non-tradables inflation helps explain which forces are driving prices at any given time.
Tradables inflation covers goods and services that are imported or compete with imported products — petrol, imported food, electronics, clothing, international airfares, and similar items. The prices of these goods are largely set by global markets and exchange rates. When the global oil price surges, petrol prices rise in New Zealand regardless of what domestic policy does. When the New Zealand dollar weakens, imported goods become more expensive. New Zealand cannot control tradables inflation directly — it comes from the world outside.
Non-tradables inflation covers goods and services that are produced and consumed domestically — housing costs, local services, council rates, domestic food production, construction, and so on. These prices are more directly influenced by domestic demand and supply conditions. When the domestic economy is running strongly and spending is high, non-tradables prices tend to rise. When the economy is subdued with spare capacity, non-tradables inflation tends to moderate. This is the type of inflation that the Reserve Bank can most directly influence through its interest rate settings.
New Zealand's December 2025 inflation reflects a mix of both. Non-tradables pressures — electricity, rates, rent — have driven most of the persistent inflation. Tradables inflation — petrol, airfares — has added to the picture, particularly as the Middle East fuel crisis pushes oil prices higher in early 2026.
The Inflation Target
New Zealand has a formal inflation target — the government has mandated the Reserve Bank to keep inflation between 1 and 3 percent over the medium term, with a focus on the 2 percent midpoint. This target band is the benchmark against which inflation performance is assessed.
The target was first introduced in 1990 — making New Zealand one of the first countries in the world to adopt an explicit inflation target. The framework has been widely influential internationally and is now standard practice among central banks in developed economies.
The target exists because low, stable, predictable inflation is genuinely valuable. It allows households to make long-term plans with confidence. It protects the purchasing power of wages and savings. It enables businesses to invest with greater certainty. And it removes the damaging dynamics of high inflation — the wage-price spirals, the erosion of savings, the redistribution of wealth from creditors to debtors — that characterized earlier periods of New Zealand economic history.
New Zealand's Recent Inflation History
New Zealand's inflation history over the past few years has been unusually dramatic by modern standards.
Inflation was subdued for most of the 2010s — comfortably within the 1 to 3 percent target band. Then COVID-19 hit. The combination of supply chain disruptions, global shipping delays, commodity price surges following Russia's invasion of Ukraine, and strong domestic demand from government stimulus and low interest rates pushed inflation sharply higher. Annual CPI inflation peaked at 7.3 percent in 2022 — the highest in three decades.
The Reserve Bank responded by aggressively raising the Official Cash Rate — from 0.25 percent to 5.5 percent between October 2021 and May 2023. This was the fastest and steepest tightening cycle in the bank's modern history. Higher interest rates squeezed household budgets and cooled demand, and inflation gradually returned to within the target band by mid-2024.
By the December 2024 quarter, inflation had fallen to 2.2 percent — close to the 2 percent midpoint. The Reserve Bank began cutting rates. The immediate inflation battle appeared won.
But inflation has proven stubborn at the margins. In the year to December 2025, it edged back up to 3.1 percent — just above the target ceiling — driven by electricity prices, council rates, and food. These administered and regulated prices are largely outside the direct influence of monetary policy.
And in April 2026 a new threat arrived. The Middle East conflict disrupted global oil supply through the Strait of Hormuz, pushing fuel prices sharply higher. The Reserve Bank held the OCR at 2.25 percent at its April 8 meeting — balancing the risk of inflation becoming entrenched against the risk of stifling the still-fragile economic recovery. Its updated forecast now projects inflation peaking at 4.2 percent in the June 2026 quarter, assuming oil prices moderate by late June.
Who Inflation Hurts Most
Inflation does not affect all New Zealanders equally. Its distributional effects — who bears the burden — depend on which prices rise, what people spend their money on, and what assets and debts they hold.
People on fixed incomes — retirees, those on benefits — face particular hardship when inflation is high because their incomes do not automatically rise with prices. New Zealand Superannuation is indexed to wages, providing some protection, but other fixed or slowly rising incomes erode in real terms.
Renters face direct cost pressure when rents rise — they cannot offset this through housing capital gains the way homeowners can. When housing costs are the primary driver of inflation, as they have been in New Zealand, renters bear a disproportionate share of the burden.
Lower-income households spend a higher proportion of their income on essential goods — food, energy, housing — whose prices have risen fastest. The composition of inflation matters as much as its level: inflation driven by essentials hits harder than inflation driven by discretionary goods.
Debtors at fixed rates are insulated from the interest rate consequences of inflation during a high inflation period but face the risk of having to refinance at much higher rates. Savers holding cash see their real purchasing power eroded. Homeowners with mortgages saw their repayments rise sharply when rates increased to combat inflation — a particularly acute pressure in a country where mortgage debt is among the highest in the OECD relative to incomes.
Quick Q&A
What is the CPI? The Consumers Price Index — the main measure of inflation in New Zealand. It tracks the price of a basket of 598 goods and services that typical households buy and is published quarterly by Statistics New Zealand. The annual CPI figure shows how much prices have risen compared with the same quarter a year earlier.
What is New Zealand's inflation target? Between 1 and 3 percent annually over the medium term, with a focus on 2 percent. The Reserve Bank is legally required to manage monetary policy to keep inflation within this band.
What is driving inflation in New Zealand in 2025-26? Primarily administered and regulated prices — electricity (up 12.2 percent), local authority rates (up 8.8 percent), and rent. Global oil prices surging following the 2026 Middle East conflict are adding a new layer of tradables inflation pressure.
What is the difference between tradables and non-tradables inflation? Tradables inflation covers the price of goods and services that are internationally traded — petrol, imported food, electronics. These prices are set by global markets and exchange rates, and New Zealand cannot directly control them. Non-tradables inflation covers domestically produced goods and services — housing, local services, rates. This is more directly influenced by domestic demand and monetary policy settings.
Why does 2 percent inflation matter? Low, stable inflation protects the purchasing power of wages and savings, allows long-term planning, and removes the economic distortions created by high or unpredictable inflation. New Zealand was one of the first countries to adopt an explicit inflation target, in 1990, and the framework has been influential worldwide.
Key Takeaway
Inflation is the sustained rise in the general price level — and its management is one of the most consequential tasks in economic policy. New Zealand experienced its sharpest inflation episode in three decades following COVID-19, with the CPI peaking at 7.3 percent in 2022. That episode has largely been resolved through aggressive monetary policy tightening — but the residual pressure from high electricity prices, council rates, and now a global oil shock means New Zealand is entering 2026 with inflation again at the top of its target band and rising. Who bears the cost of inflation matters as much as the headline number — and in New Zealand, the composition of recent inflation has fallen hardest on renters, lower-income households, and those most exposed to rising essential costs.
Sources
Reserve Bank of New Zealand — Inflation
Reserve Bank of New Zealand — OCR on Hold at 2.25%, April 2026
Reserve Bank of New Zealand — Monetary Policy Statement February 2026
Reserve Bank of New Zealand — Prices M1 Data Series
Statistics New Zealand — Annual Inflation at 3.1 Percent in December 2025
Trading Economics — New Zealand Inflation Rate
FocusEconomics — New Zealand Inflation Q4 2025