National Bank: A Strong Quarter Overshadowed by AIRB Deferral and Unprecedented Mortgage Growth

Robust Q3 results mask a delayed CWB AIRB conversion and persistent P&C NIM pressure, even as mortgage growth reaches an outlier pace.

NA.TO · Earnings Call · 2026-08-26

A Deceptively Strong Quarter

National Bank of Canada posted a robust Q3 2026: EPS of $3.39, up 26% year-over-year, revenues +18%, and positive operating leverage of nearly 6%. The commercial banking franchise continues to hum, and mortgage growth was exceptional. But beneath the headline numbers, management delivered two messages that will shape the story into 2027: the AIRB conversion of the CWB portfolio is being deferred, and the P&C NIM is under structural pressure.

The AIRB Conversion: A Sobering Update

The most significant change was the shift in the AIRB timeline. CFO Marie Chantal Gingras explained that the two-quarter regulatory parallel run is complete, but additional model refinements are needed:

we concluded that additional model refinements are needed before seeking regulatory approval given the current stage of the credit cycle including higher observed default rates. Accordingly, we have decided to defer this into fiscal 27… the benefit is likely to be more moderate than our previous estimate.
Marie Chantal Gingras, Chief Financial Officer · 2026-08-26

This is a clear retreat from the prior expectation that the bulk of the benefit would land in late 2026. In the February call, Gingras had guided to a more constructive path: “We continue to converge to a CET1 ratio of 13% by the end of 2027, and that would generate 40 basis points of ROE.” — Marie Gingras, Chief Financial Officer · 2026-02-25 A year earlier, in August 2025, she had described the conversion as a progressive process: “we've done this quarter and the past quarter, a small conversion of portfolio totaling 5 basis points cumulative so far.” — Marie Chantal Gingras, Chief Financial Officer · 2025-08-27 Now the conversion is pushed to late 2027 and tracked to the lower end of the 35–55 basis point range. “the conversion will happen late 2027.” — Marie Chantal Gingras, Chief Financial Officer · 2026-08-26 The AIRB conversion was a key pillar of the ROE uplift story; its deferral removes a near-term catalyst, even as the CWB portfolio integration otherwise proceeds well. The rationale is sound – higher observed default rates in the CWB book require recalibration – but the market will likely penalize the bank for the lost optionality. Management also noted that "benefits are expected to begin materializing in late 27," which means the CET1 ratio will stay elevated, possibly above 13%, for longer.

Mortgage Growth: An Outlier Begging Questions

The most intriguing element of the call was the mortgage growth outlier. Analyst Mike Rizvanovic noted that insured balances rose 8% sequentially, far outpacing peers: “I have never seen this level of divergence in any lending category.” — Mike Rizvanovic, Analyst · 2026-08-26 Head of Personal Banking Julie Levesque attributed the surge to distribution and relationships: “it is really the strategy of both of our distribution network and the broker channel… there is nothing mysterious about how we deliver those results.” — Julie Levesque, Head of Personal Banking, Commercial and Private Banking · 2026-08-26 She also pointed to the July 1 Quebec moving dynamic and the First National partnership. The risk officer added that underwriting standards have not changed, and that lower house prices in Ontario are naturally boosting insured eligibility. This growth comes at a cost: it is a direct driver of the 7 basis point sequential decline in P&C NIM. Management remains convinced the trade-off is acceptable, framing mortgages as a client acquisition vehicle. But the market is clearly questioning the sustainability of pricing discipline. The bank's own mortgage growth is a company-unique story – Quebec-heavy and broker-led – and it is diverging from peers in a way that invites scrutiny.

The Cost of Growth

The NIM compression is not a one-off. Julie Levesque acknowledged that "mortgage margins… continue to see a really competitive environment, particularly around new originations and renewals," which translates into persistent spread pressure. The bank is relying on volume and cross-sell to offset, but the trade tensions and an uncertain Canadian economy add an overlay of risk. Laurent Ferreira reiterated that capital priorities remain organic growth, not buybacks: “our focus is not on buybacks, but, obviously, they are an add on to returning capital to our shareholders.” — Laurent Ferreira, President and CEO · 2026-08-26 This stance, combined with the AIRB deferral, means the CET1 ratio is likely to stay above 13% for longer. What matters for investors is that National Bank is executing well on the fundamentals, but the two core levers – AIRB and NIM – are both moving in the wrong direction in the near term. The mortgage leadership is real, but it is being paid for with margin. The bank's 17%+ ROE target for 2027 now rests more heavily on revenue synergies and cost discipline, not capital optimization. That is a subtle but important shift in the story.