The Reserve Bank held the Official Cash Rate last month, yet fixed mortgage rates have already climbed. Here is why, and what the energy shock means for what you pay.
If you have looked at a fixed mortgage rate lately and found it higher than it was at the start of the year, you are not imagining it. The strange part is that it happened while the Reserve Bank sat still. The average two-year special rate rose about 25 basis points between late February and late April, before the Bank moved at all.
That is the story the Official Cash Rate headlines missed. The Reserve Bank OCR decision on 27 May was a hold, but the documents underneath it describe a turning point. We read the May Monetary Policy Statement and the Bank’s own mortgage data to work out what it means for households.
The Reserve Bank has changed direction
For most of the past two years the direction of travel was down. The OCR was cut steadily to 2.25 percent, and borrowers rolling off old fixed terms onto cheaper ones felt the relief. We previewed the May decision in our look at why the Bank was tipped to hold, and hold it did.
What changed is the road ahead. The Reserve Bank has effectively called the bottom of the easing cycle and now expects its next move to be an increase. Its May projection has the OCR rising to around 2.75 percent by the end of 2026, sooner and by more than it signalled in February, with a further modest lift in 2027. That track is a forecast conditional on inflation, not a promise, but the message is plain. The cuts are over.
How a Middle East oil shock reaches your petrol tank
The reason is a shock that started a long way from New Zealand. Disruption around the Strait of Hormuz from late February pushed up the global oil price, and that flows quickly to the pump. Petrol and diesel have jumped sharply since then.
Fuel does not stop at the service station. It is an input cost for almost everything that moves, so the Bank expects it to push up airfares, food and a long list of other prices. The inflation rate, measured by the consumers price index, was 3.1 percent in the March 2026 quarter, already above the Reserve Bank’s 1 to 3 percent target band. The Bank now forecasts it to peak at 4.3 percent in the September 2026 quarter.
That is the chain in one line. A faraway conflict lifts the oil price, the oil price lifts inflation, and rising inflation forces the Reserve Bank to think about higher interest rates rather than lower ones.
Why mortgage rates are already rising in 2026
Here is the part that catches borrowers out. Fixed mortgage rates do not wait for the OCR to move. Banks fund fixed lending in the wholesale swap market, and those swap rates reprice the moment traders expect the OCR track to shift. When the energy shock lifted the inflation outlook, the wholesale cost of fixed money rose with it, months ahead of any actual hike.
You can see it in the Reserve Bank’s own figures. Reading its B21 series of special, carded rates on new lending, the moves between late February and late April are clear.
| Term | Late Feb | Late Apr |
|---|---|---|
| 1-year special | 4.46% | 4.59% |
| 2-year special | 4.80% | 5.05% |
The energy shock is the trigger here rather than the sole cause. Swap rates also move on global bond yields and offshore funding costs, so not every borrower’s rate has risen by the same amount, and carded rates differ from the discounted rate you might negotiate. But the direction is consistent across terms, and it runs ahead of the Bank.
What the OCR forecast track means for borrowers
If the Bank’s track plays out, fixed rates have further to climb. The practical question is what that does to a repayment. As an illustration, on a 500,000 dollar loan over 30 years on principal and interest, an increase of half a percentage point adds roughly 150 to 170 dollars a month, depending on the rate you start from.
Treat that as an example, not a forecast for your loan. It assumes a full table repayment rather than interest only, the loan size is an assumption rather than a typical figure, and your actual rate depends on your lender, term and equity. The cleanest way to see your own number is to model it. Our mortgage payoff tool lets you put in your real balance and rate and watch the repayment change.
The double squeeze on households
For many families the timing is unkind, because the same shock hits twice. The fuel that is more expensive at the pump is also the reason the mortgage is getting dearer. Petrol and interest, two of the largest fixed costs in a household budget, are rising together rather than offsetting each other.
The pressure is not spread evenly. The most exposed are recent buyers with large loans relative to their income, and anyone whose cheap fixed term expires in 2026 and rolls onto a rate a full percentage point or more higher. A household that fixed at the bottom of the cycle has been insulated so far, but that insulation runs out on a known date. Knowing when your term ends is the single most useful thing you can do this year.
Petrol and interest, two of the largest fixed costs in a household budget, are rising together rather than offsetting each other.
When mortgage rates might fall again
The relief depends on the same thing that caused the squeeze. Fixed rates will start to ease again once markets are convinced inflation is heading back inside the target band, which the Reserve Bank expects to happen as the fuel spike washes out of the figures during 2027. If the oil price settles sooner, that timeline shortens. If the conflict deepens, it stretches.
For now the prudent assumption is that the cheapest rates of this cycle are behind us. That does not mean panic, but it does mean planning. If your term is ending this year, it is worth comparing where fixed rates sit before you roll, rather than after.
Quick answers
Will mortgage rates go up in 2026?
Fixed mortgage rates have already risen in 2026, ahead of the Official Cash Rate, because wholesale funding costs repriced for higher inflation. The Reserve Bank’s forecast track implies further increases through the year.
What is the OCR forecast for 2026?
The Reserve Bank held the OCR at 2.25 percent in May and projects it rising to around 2.75 percent by the end of 2026, with a further modest lift in 2027. The track is a forecast, not a commitment.
How does the OCR affect my mortgage?
The OCR sets the base cost of money. Floating rates track it closely, while fixed rates follow wholesale swap rates that move ahead of the OCR on what markets expect the Bank to do next.
As at June 2026. Primary sources for this article: the Reserve Bank May 2026 Monetary Policy Statement, the OCR decision, the Reserve Bank B21 mortgage rate series, and Stats NZ March 2026 inflation figures.
Has your fixed term come up for renewal this year, and how much more are you paying? Share your experience in the comments below.
This article was written by AI, briefed to report the facts, hopefully without some of the bias people bring to the job 🙂
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