The Reserve Bank of New Zealand appears set to raise the Official Cash Rate again this week, with NZIER's Monetary Policy Shadow Board reporting that just over half its members recommend a 25 basis point increase to 2.75 percent at the RBNZ's Monetary Policy Statement on September 2. The independent panel's split verdict, released Monday, nonetheless leaves a meaningful minority favouring a hold at the current 2.50 percent.

The Shadow Board result points to a hike as the more likely outcome on Wednesday, but the division within the panel tempers how confidently markets should price it in. A 25 basis point increase to 2.75 percent would extend the tightening cycle the RBNZ resumed in July and align with the median view already circulating among bank economists ahead of the meeting. Given that most forecasters already expect this outcome, the more market-sensitive elements are likely to be the accompanying OCR track and any signal on October, where the panel and outside economists broadly expect a data-dependent, rather than pre-committed, stance. A hike delivered with cautious forward guidance would likely be read as only mildly hawkish for the New Zealand dollar, whereas a hold, or a hike paired with an unexpectedly firm tightening signal, would produce a larger repricing given how closely the outcome tracks consensus. That dynamic matters beyond currency markets: OCR moves feed directly into floating mortgage rates and term deposit pricing for New Zealand households, which is one reason the pace of tightening draws wide public attention.

Why members back a hike

Those supporting further tightening argue the OCR remains well below neutral even as core inflation sits at the top of the RBNZ's target band, leaving less room to justify continued stimulus. They point to inflation remaining high and the need to keep returning the OCR toward neutral. The RBNZ operates under a Remit that requires it to keep future CPI inflation outcomes between 1 and 3 percent over the medium term, so inflation at the top of that band constrains how long policy can stay accommodative.

Others on the panel took a more cautious view, noting that domestic economic activity remains subdued and that inflation expectations in the RBNZ's own Survey of Expectations have eased recently. In their assessment, those conditions favour holding rates steady for now rather than adding further pressure to a fragile recovery. The tension between still-high inflation and weak activity is the same trade-off that has divided commentary among outside economists in the lead-up to the meeting.

Policy backdrop

The RBNZ resumed tightening this cycle by lifting the OCR to 2.50 percent in July as it works to bring inflation, which peaked at 3.9 percent in the June quarter, back toward its 1 to 3 percent target range. That decision came even as falling global oil prices, aided by some easing in Middle East tensions at the time, reduced the near-term inflation forecast relative to the RBNZ's earlier projections. Inflation has now been outside the target band for an extended run of quarters, which is the backdrop for the RBNZ's renewed tightening after earlier pauses.

Looking further out, Shadow Board members were broadly aligned that the OCR should keep climbing over the coming year, with individual views clustering between 3 and 3.25 percent. Several members stressed a preference for gradual increases that balance controlling inflation against supporting a still-fragile economy. This outlook is consistent with external bank forecasts that see the RBNZ signalling a similar tightening path while remaining deliberately non-committal about the pace of further moves, including whether an additional increase follows at October's Monetary Policy Review.

How the Shadow Board works

The NZIER Shadow Board operates independently of the RBNZ, with each participant assigning a probability weighting to potential policy actions that are then averaged into a single panel view. It was established to provide an independent, quantitative read on what an appropriately weighted policy debate would conclude, and its releases typically frame expectations in the run-up to each RBNZ decision. Its next release is scheduled for October 27, ahead of the RBNZ's subsequent Monetary Policy Review.

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Earlier coverage:

Preview: Inflation and growth strength point to further RBNZ tightening, BNZ says

90% of economists expect RBNZ hike on September 2, poll shows