Global events can feel very far away — until they show up in your petrol bill. And right now, what’s happening in the Middle East is doing exactly that. But beyond the pump, there’s a bigger question for anyone with a mortgage, planning to buy, or managing a business with property debt: what does this mean for interest rates here in New Zealand?

Let me break it down in plain language.

What’s Happened?

Over the past few weeks, military conflict in the Middle East — involving the US, Israel, and Iran — has caused a major spike in global oil prices. At one point, Brent crude oil hit around $115 per barrel, roughly 56% above where it was before the conflict began. That’s a significant shock to global energy markets.

The good news? There’s been some diplomatic progress that has brought prices back down toward the $88–92 range. But the situation remains uncertain, and the damage to New Zealand’s economic outlook is already being felt.

So What Does Oil Have to Do With My Mortgage?

Here’s the connection — and it’s an important one.

When oil prices rise sharply, everyday costs go up: petrol, transport, goods on the shelf. That pushes inflation higher. New Zealand’s annual inflation was already sitting at 3.1% at the end of 2025 — right at the top of the Reserve Bank’s target band of 1–3%.

Now, with oil fuelling that fire (no pun intended), economists across our major banks — ANZ, BNZ, Westpac, and Kiwibank — are revising their inflation forecasts upward. Westpac is now expecting inflation to sit close to 2.9% through the middle of this year, only cooling to around 2.6% by year-end.

Why does that matter for your mortgage?

The Reserve Bank of New Zealand (RBNZ) controls the Official Cash Rate (OCR) — the lever it uses to manage inflation. When inflation is high, the RBNZ raises the OCR. When rates rise, mortgage rates rise too.

Will the RBNZ Hike Rates?

Here’s the nuance — and it’s actually a bit of good news.

Despite the upward pressure on inflation, economists don’t expect the RBNZ to raise rates in response to this oil shock. Here’s why:

1. It’s a supply shock, not a domestic spending problem.
The RBNZ’s standard approach is to look through short-term inflation caused by external events like oil price spikes. Hiking rates wouldn’t make petrol cheaper — it would just hurt households already feeling the pinch.

2. New Zealand’s economy is fragile.
We’re coming off a tough year. Unemployment is elevated, and the economy needs room to breathe. Kiwibank’s chief economist Jarrod Kerr put it plainly: the RBNZ may have to tolerate higher inflation in the short run to avoid tightening into a slowing global economy.

3. Higher petrol prices actually dampen demand elsewhere.
When Kiwis spend more on fuel, they spend less on other things — restaurants, retail, services. That dampening effect on the economy can actually reduce inflation over the medium term.

For all these reasons, the consensus view is that the RBNZ will stay on hold — keeping the OCR where it is until at least December 2026, when it may resume cutting.

What Does “On Hold” Mean for Borrowers?

It means we’re in a waiting game. The further rate cuts many homeowners were hoping for in the first half of 2026 are now less certain. If you were banking on rates coming down further before your fixed rate expires, you may need to adjust your thinking.

Some practical implications:

• If your fixed rate is expiring soon — now is an excellent time to get a review. We can look at your options across lenders and find the best deal for where rates are sitting right now.
• If you’re a first home buyer — the affordability equation hasn’t dramatically changed, but your planning horizon may need to stretch slightly. Let’s talk.
• If you’re a property investor — cost of debt staying higher for longer affects cashflow projections. We can help you model different scenarios.
• If you’re a business owner or iwi enterprise — commercial lending rates are equally affected. Understanding the longer-term rate outlook is crucial for investment decisions.

The Bigger Picture

Events like this remind us that New Zealand doesn’t exist in a bubble. What happens in the Strait of Hormuz, or in Tehran, eventually finds its way into our mortgage statements. That’s not a reason to panic — but it is a reason to stay informed and plan proactively.

At Integral Advice, I work with clients across Wellington, Auckland, and Northland — from first home buyers taking their first steps onto the property ladder, to whānau and hapū enterprises building long-term wealth. Whoever you are, the message is the same: don’t wait for the market to make decisions for you.

Let’s Talk

If you’d like to understand what the current rate environment means for your specific situation — whether you’re refinancing, buying, or reviewing your investment structure — I’d love to have a kōrero.

📅 Book a Review →

📧 [email protected]

Kia tau te mauri, kia watea te ara.

The big takeaway

This article is for general information purposes only and does not constitute financial advice. Please speak with a qualified adviser (that’s me!) before making any decisions about your mortgage or lending structure.

Sources: MPA Magazine NZ | Westpac IQ | NZ Herald | NZ Adviser | Kiwibank Economic Commentary