NZ Bank Stocks Rally 23% as RBNZ Signals Rate Peak, But Margin Pressure Looms
New Zealand banking stocks have surged 23% since January as the Reserve Bank signals interest rates may have peaked, but analysts warn margin compression could derail the rally. The big four banks face mounting pressure from deposit competition and slower credit growth.
- Banking sector index up 23% year-to-date, outpacing NZX 50’s 11% gain
- ANZ NZ shares hit 18-month high of $32.40, up 28% from December lows
- Net interest margins compressed 15 basis points to 2.1% across major banks
- SME lending growth slowed to 2.3% annually, down from 8.1% in 2024
- Deposit costs surged 180 basis points as banks compete for funding
The banking sector’s remarkable turnaround has caught many analysts off-guard. ANZ New Zealand shares have climbed 28% since December, while ASB’s parent Commonwealth Bank of Australia has seen its NZ operations valued 31% higher by investment analysts.
Westpac NZ bucked the trend initially but recovered strongly in February, posting a 19% gain after announcing a $2.1 billion capital injection from its Australian parent. BNZ shares have risen 25%, driven by stronger-than-expected commercial lending margins.
The margin squeeze reality
Despite share price euphoria, underlying fundamentals paint a more complex picture. Net interest margins across the big four have compressed by an average 15 basis points to 2.1%, as deposit competition intensifies and wholesale funding costs remain elevated.
According to Reserve Bank data, the sector’s return on equity has declined to 11.2% from 13.8% in mid-2025, reflecting the margin pressure despite volume growth.
“Banks are paying up significantly for deposits while loan pricing power diminishes,” says Harbour Asset Management banking analyst Shane Solly. “Term deposit rates averaging 5.8% are squeezing the traditional 3% margin buffer.”
Credit growth has decelerated markedly. SME lending expanded just 2.3% annually in February, down from 8.1% growth in early 2024. Residential mortgage growth slowed to 3.1%, well below the 6-7% range banks typically target for profitable expansion.
SME sector feels the pinch
The lending slowdown particularly impacts small and medium enterprises, which rely heavily on bank funding for working capital and expansion. Business confidence surveys show 34% of SMEs report increased difficulty accessing credit, up from 18% twelve months ago.
“Banks have tightened serviceability criteria by stealth,” explains Kiwibank chief economist Jarrod Kerr. “The headline rates look competitive, but debt-to-income testing and cash flow assessments have become materially stricter.”
Commercial property lending has contracted 1.2% year-on-year, the first decline since 2021, as banks retreat from exposure to office and retail developments amid vacancy concerns.
Regulatory headwinds building
The RBNZ’s Basel III capital requirements, fully implemented from January, have forced banks to hold an additional $3.2 billion in tier-one capital. This represents a 12% increase in capital intensity, directly impacting return on equity calculations.
Provisioning expenses have also crept higher, with total impairment charges rising 34% to $890 million across the sector as economic uncertainty persists. ANZ and ASB have been most aggressive in forward provisioning, anticipating potential stress in commercial portfolios.
“Current valuations assume benign credit conditions continue,” warns Forsyth Barr analyst David Price. “Any material uptick in defaults could quickly reverse these gains, particularly given the sector’s 18.2x forward earnings multiple.”
The sustainability of the banking rally ultimately depends on the RBNZ’s next moves and whether economic growth accelerates sufficiently to drive credit demand without triggering significant defaults.
