Petrol drives the biggest jump in over a year
The cost of living for the average New Zealand household rose 3.2% in the 12 months to the June 2026 quarter, up from 2.1% in the year to March, according to Stats NZ's household living-costs price indexes (HLPIs).
Stats NZ prices and deflators spokesperson Nicola Growden (pictured) said fuel was the standout driver.
"Higher petrol prices were the largest contributor to the increase in household living costs in the 12 months to the June 2026 quarter," Growden said in a media release.
Petrol prices rose 27.5% over the year for the average household, accounting for almost a third of the annual increase in living costs.
Growden linked the rise directly to supply disruptions tied to the Middle East conflict, which began at the end of February, noting prices climbed in March and April before easing in May and June. She added that the impact fell unevenly across households.
"The increase in petrol prices had the largest impact on lower-spending households, as petrol makes up a larger proportion of their expenditure," Growden said.
Falling interest payments soften the overall impact
Despite the jump, the household living-costs measure remained well below the Consumers Price Index, which recorded 4.1% inflation over the same period, up from 3.1% previously.
Growden said falling interest payments explained most of the gap between the two measures.
"Interest payments for the average household fell more than 15% in the 12 months to the June 2026 quarter, while the cost of building a new home increased 2.7% over the same period," she said.
The distinction matters because the CPI captures the cost of building a new home, while the household living-costs indexes instead track mortgage, credit card, and other interest payments directly — a difference that has repeatedly cushioned average households as borrowing costs have eased.
Looking ahead, that relief may not last — the Reserve Bank lifted the OCR 25 basis points to 2.5% on 8 July, meaning the interest-payment reprieve captured in this data reflects the period before the recent hike, not what's still to come.
Diesel added a smaller but notable contribution
Diesel prices also rose over the year, accounting for nearly 10% of the average household's 3.2% inflation rate, though the overall effect was smaller than petrol's.
"For New Zealand households, petrol accounts for a much larger share of household expenditure than diesel," Growden said.
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