Flat mortgage curve makes longer fixes cheap insurance — for now
Major-bank specials still price six-month fixes near 4.75% and one-years just under 5%, while two-to-five-year money sits only 0.4–0.7 percentage points higher. That flat curve makes multi-year certainty unusually cheap after the OCR lift to 2.75%.
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Major-bank specials still price six-month fixes near 4.75% and one-year specials just under 5%, while two-to-five-year money sits only 0.4–0.7 percentage points higher. That flat curve makes multi-year certainty unusually cheap after the OCR lift to 2.75%.
New Zealand's major banks are still offering six-month fixed specials around 4.75% and one-year specials just under 5%. Two- to five-year specials cluster between about 5.39% and 5.69%. The gap from the cheapest one-year point out to three years is only about 0.4–0.5 percentage points at several lenders.
That is a historically flat curve. Borrowers who want multi-year certainty are not paying a large insurance premium relative to recent cycles.
RateMate and BusinessDesk tables updated 9 September 2026 show Westpac and Kiwibank six-month specials at 4.75%. Kiwibank's one-year special sits at 4.95%. ANZ, ASB, BNZ and Westpac one-years are at 4.99%. Westpac's three- and four-year specials are 5.39%. BNZ and Westpac five-years are 5.49%. Kiwibank's five-year is 5.69%.
Opes Partners' 9 September snapshot matches that stack: lowest major six-month 4.75%, lowest one-year 4.95% (Kiwibank), lowest three- and four-year 5.39% (Westpac), lowest five-year 5.49% (BNZ and Westpac).
The Reserve Bank raised the OCR 25 basis points to 2.75% in early September. Floating rates at ANZ, ASB, BNZ, Westpac and Kiwibank moved up the full 25 basis points. Fixed specials had already been climbing for months as wholesale swaps priced the tightening path.
Major-bank fixed mortgage specials by term, 9 September 2026
The gap from one year to three years is only about 40 basis points — a historically flat curve.
Source: RateMate / Opes Partners, 9 September 2026
What the economists are saying
Bank desks still split on how much further short fixed rates must rise. Canstar's round-up of bank forecasts has ASB taking the OCR to about 3% by year-end and looking for higher mortgage rates over the next year. Westpac has flagged two-to-five-year fixes as attractive on its path. BNZ's published call has been more hawkish on the OCR peak than market pricing.
ANZ strategist David Croy set out the pure cost arithmetic in early August. He calculated that the median one-year rate would need to rise to 5.83% in a year's time before two back-to-back one-year fixes cost more than a two-year fix then near 5.29%.
We don't expect one-year rates to rise by that much and in broad-brush strokes, would add that the OCR would likely need to be nearer 4% than 3% for one-year mortgage rates to get closer to 6% rather than 5%.
That is a jump of roughly 80–90 basis points from today's sub-5% one-year specials — larger than most bank base-case paths for near-term fixed-rate upside.
Croy also noted markets were already pricing more OCR hikes than ANZ's own forecast. If ANZ is right, rolling short fixes can still win on interest cost. Borrowers who want certainty pay up front for it.
Why the curve is flat
Banks price fixed mortgages off the swap curve plus funding, credit and capital margins. Short specials reprice first when the OCR and front-end swaps rise. Longer tenors already embed part of the expected path, so they move less. The result is compression between one year and three-to-five years.
RBNZ commentary around the September decision noted higher wholesale rates had already lifted bank mortgage rates. It also flagged limited pass-through to term deposit rates, which lowers banks' marginal funding cost relative to a full deposit reprice.
Treasury's Fortnightly Economic Update of 20 August 2026 put the household channel in plain view: household spending improves as house prices fall amid increasing interest rates. Consumer price pressures eased in July, but firms faced higher costs in the June quarter. Global long-term rates were being pushed higher by inflation and fiscal concerns.
That backdrop keeps the RBNZ data-dependent. It also keeps the mortgage decision about more than picking the absolute trough.
Dollars on a typical loan
On a $500,000 principal-and-interest loan over 30 years, a 25 basis-point rate rise lifts monthly repayments by roughly $75–$80. That is about $35–$40 a fortnight. Scale to $600,000 and the fortnightly hit is about $42–$48.
Fortnightly repayment impact of a 25bp rate move
Loan scenario
Fortnightly repayment change
$500,000 loan, 25bp rise
~$35–$40
$600,000 loan, 25bp rise
~$42–$48
$500,000 loan, 1yr→3yr (~40bp)
~$55–$60
Illustrative principal-and-interest impact on a 30-year loan.
The gap from a one-year special near 4.99% to a three-year near 5.39% is about 40 basis points — roughly $55–$60 a fortnight on $500,000. Out to a five-year near 5.49–5.69% the extra cost is larger, but still modest against the 2022–23 peak when one-year specials approached or exceeded 7%.
ASB and other majors routinely offer split structures. Putting part of the loan on one year and part on three-to-five years buys partial insurance without locking the whole balance at the longer rate. Break fees, planned sale dates and cash-flow buffers still matter as much as the headline special.
Follow the money
ANZ, ASB, BNZ, Westpac and Kiwibank set the specials most refixing owner-occupiers actually pay. Competitive pressure shows up weekly in the carded sheets. When wholesale rates or OCR expectations shift, short specials move first. Longer specials lag.
A heavy short-fix share keeps monetary transmission fast into average outstanding mortgage yields. A shift toward three-to-five-year money slows that pass-through when the cycle turns again. Either mix feeds debt-servicing ratios watched by the RBNZ's financial stability team and by the banks' own stress tests.
For households carrying the bulk of New Zealand private debt, the question is not whether rates have left the late-2025 and early-2026 lows. They have. The question is whether 40–70 basis points of extra coupon is a fair price for locking the next three to five years while the OCR path remains open.
On today's curve, that insurance is cheaper than it has been for some time. It is not free. Borrowers who expect the RBNZ to stop near 3–3.5% and short fixed rates to average close to current levels can still favour rolling one-years. Those who want a hard cap on servicing, or who fear a fiercer inflation surprise, can buy duration without paying the steep premiums of prior cycles.
Watch the next MPS, the B21 new residential mortgage rate series, and the majors' weekly special sheets. The spread between one year and three years will tell you whether the insurance stays cheap.
