NZ Mortgage Holders Warned of Rising Costs Despite Stable OCR

New Zealand mortgage holders face a period of escalating borrowing costs over the next six to 12 months, despite the Reserve Bank of New Zealand (RBNZ) keeping the Official Cash Rate (OCR) on hold. On May 27, 2026, the central bank maintained the OCR at 2.25% following a highly contested meeting that highlighted a widening division over the country's monetary policy direction.

The pause offers little comfort to homeowners as wholesale interest rates continue to climb, forcing retail mortgage rates up even without a direct OCR hike. This shift marks a significant turning point for the local property market, prompting a dramatic adjustment in borrower behaviour as New Zealanders prepare for higher debt-servicing costs.

A Divided Central Bank and Hawkish Forecasts

The decision to hold the OCR at 2.25% on May 27, 2026, was not a unanimous one. The Monetary Policy Committee (MPC) was split down the middle with a 3-3 vote, requiring Governor Anna Breman to use her casting vote to maintain the status quo. This division reflects intense debate within the committee regarding the path of domestic inflation and global economic volatility, including the ongoing impact of the Iran conflict on fuel prices and supply chains.

Despite the temporary pause, the central bank's updated forecasts lean heavily hawkish, signalling that rate increases are on the horizon. The RBNZ revised its OCR forecast for September 2026 upward to 2.51%, up from the previous projection of 2.28%. Looking further ahead, the June 2027 OCR forecast has been raised to 3.07%, compared to the earlier estimate of 2.62%.

The revised outlook is driven by persistent domestic inflation, which is forecast to peak at 4.3% in the September quarter of 2026. The RBNZ does not project inflation to return to its target range until mid-2027. Borrowers and market participants will closely watch the upcoming policy reviews, with the next RBNZ Monetary Policy Review scheduled for July 8, 2026, followed by the Monetary Policy Statement on September 2, 2026.

Wholesale Markets Drive Mortgage Rates Higher

While the official cash rate remains unchanged for now, the wholesale markets have already moved. The two-year swap rate, a key benchmark that heavily influences fixed-term mortgage pricing, has increased by approximately 70 basis points since early March.

This upward pressure has quickly passed through to retail banks, including Westpac, Kiwibank, and BNZ. Advertised two-year home loan rates have increased by approximately 20 basis points since early March. Koura Wealth founder Rupert Carlyon highlighted that two-year special mortgage rates have risen from a trough of approximately 4.5% late last year to about 5.2% currently.