Every major bank passed the hike straight through to floating mortgages within days. Half the bank economists didn't see it coming. Here's what actually shifted, and what it means across a portfolio.
On Wednesday 8 July, the Reserve Bank raised the Official Cash Rate 25 basis points to 2.50%. It's the first hike in three years, and it caught more than half the bank economists off guard.
Going into the meeting, ANZ and BNZ expected a hike. ASB, Westpac and Kiwibank had all pencilled in a hold. The Monetary Policy Committee went with the hike, and did it by consensus, six votes to zero. That's notable on its own. The May meeting was split 3-3.
The official line centres on inflation. Annual inflation is expected to have peaked at 3.9% in the June quarter, easing to 3.3% by September, with a return to the 2% target midpoint pencilled in for mid-2027.
Global oil prices have fallen back after the partial reopening of the Strait of Hormuz, which has taken some heat out of near-term inflation. But the Committee was clear that the effects of the earlier shock will linger, and the medium-term outlook stays uncertain. Their language: further hikes look likely, but the timing isn't fixed. That's a central bank keeping its options open rather than committing to a path.
In Issue 8, most bank economists were pointing to the first hike landing in September, once the OCR had spent a few more months at its estimated neutral rate. It arrived two months early, and by full consensus rather than a split vote - a sign the Committee moved with more conviction than the pre-meeting picture suggested.
The 6-0 vote is a bit misleading on its own, though. It papers over a real split in how urgently different members think the OCR needs to keep rising. Half the Committee, including Assistant Governor Karen Silk, has been the more cautious camp, framing this move as trimming back stimulus rather than shifting to genuinely tight policy. The setting is still supportive of the economy at this level, just less so than before. The other half leans towards moving faster. Both sides landed on the same call in July. Whether they still agree by September is a different question.
The inflation numbers weren't the only thing behind the move. The Committee also pointed to global growth holding up better than expected, ongoing investment tied to AI, and financial conditions that had already eased on their own, on top of the disinflation story.
Part of the reasoning behind the hike was that oil prices had fallen back after a ceasefire deal between the US and Iran earlier in the year. That picture didn't hold. Within days of the 8 July decision, Iran again claimed to have closed the Strait of Hormuz, and the US and Iran exchanged strikes, putting the earlier deal in doubt. The RBNZ itself has described the geopolitical situation as fluid and something it's watching closely. For a decision partly justified by falling oil prices, having that reverse within days of the announcement is a reminder of how quickly these inputs can move, and it's still an open question as this issue goes to print.
A few things worth noting from the days after the decision.
Every major bank passed the full 25 basis points straight through to floating mortgage rates. That's a shift in behaviour. On the way down, banks had held back 40-50 basis points of RBNZ cuts rather than passing them on in full. Going up, there was no such lag.
The NZD picked up about 0.4% against the USD, to around 0.5699, as the hike made New Zealand-dollar assets marginally more attractive to overseas investors.
Bank economists have moved their forecasts. ANZ's Sharon Zollner reads the RBNZ's guidance as fairly low-key, but still expects hikes at both remaining meetings this year, taking the OCR to 3% by December. Westpac and Kiwibank are in the same place: two more hikes, OCR at 3% by year end. Tony Alexander's take is more cautious - he's flagged that floating rate borrowers should expect the full pass-through, and that uncertainty over pace and destination means this isn't the moment to take on more interest rate risk than you're comfortable with.
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None of this points to a single right move. It's a reminder of how a rate change ripples through different parts of a portfolio differently.
Term deposits and savings. Rates for savers tend to follow the OCR up, and with two more hikes pencilled in for this year, there may be more room to run. Laddering terms rather than locking everything into one rate is one way to keep some flexibility as the picture develops.
Mortgages. Anyone on a floating rate has already felt this one. Anyone refixing in the next few months is refixing into a materially different rate environment than a year ago.
Growth assets. Rate hikes tend to weigh more heavily on interest-rate-sensitive sectors - property and utilities on the NZX are the classic examples - than on the market as a whole. It's a reminder of why diversification across sectors, and not just across individual stocks, matters.
Overseas holdings. A 0.4% currency move is small, but it's a live example of how FIF and other offshore investments are exposed to exchange rate movements on top of the underlying asset's performance, as covered in Issue 10. Understanding that exposure matters more than trying to time it.
KiwiSaver. Conservative and balanced funds hold more fixed interest than growth funds. Rate hikes can pressure the value of existing bonds even as the running yield on new fixed interest improves. "Conservative" doesn't mean risk-free, just a different mix of risks.
A rate hike that half the country's bank economists didn't call is a good reminder that no one, including central banks, can time this precisely. The useful response isn't to predict the next move. It's to check whether your portfolio already assumes the old environment.
Rather than reacting to one rate decision, it's worth checking whether your mix of term deposits, mortgage structure, growth assets and KiwiSaver settings reflects the rate environment we're actually in now, not the one from a year ago. That's a five-minute review, not a portfolio overhaul - and it's the kind of check that's easy to skip until a decision like this one forces the question.
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