National Australia Bank

The Business

NAB operates through four divisions. Business & Private Banking is the largest profit contributor and holds the #1 position in Australian SME lending. Personal Banking covers mortgages and consumer credit, where NAB's share (around 14%) trails the major mortgage lenders. Corporate & Institutional Banking serves large corporates and government, while Bank of New Zealand adds geographic diversification outside the domestic cycle. Unlike a wholesale-funded lender, NAB draws roughly $693 billion of customer deposits to fund 84% of its loan book, a relationship-based funding advantage built over 160 years that is difficult for challengers to replicate.

Recent Performance

NAB's credit impairment charge roughly doubled over the past year as the Reserve Bank's tightening cycle worked through business and household borrowers, with watch loans up 30% half-on-half. Revenue still grew 5.8% in FY26, up from 2.9% the prior year, but that growth rode a net interest margin that peaked at 1.80%, a level we expect to erode from here. The share price has continued climbing despite this emerging credit stress.

Outlook

We expect net interest margin to compress over the next two to three years as deposit competition and lower rates bite, partly offset by loan growth near 4% annually. Credit costs should peak within the next year before easing. Cash earnings are expected to recover gradually over the following two to three years, a path that depends on the credit cycle resolving broadly as expected rather than deteriorating further.

Key Risks

A sharper credit downturn than currently anticipated, with charge-offs running materially above our base case, could meaningfully reduce cash earnings from forecast levels. Separately, NAB's current earnings multiple leaves little room for disappointment: any reversion toward the lower multiples typically applied to its major peers would weigh on the share price independent of operating performance. Faster-than-expected rate cuts present a third risk, one that could compress net interest margin beyond current assumptions, though the same rate-cutting cycle that pressures margin is also the scenario most likely to lower the market's required return on bank equity.

What to Watch

The thesis-defining event is NAB's half-year result in May 2027, which will confirm whether net interest margin is stabilising and whether credit costs are peaking on schedule.

• Feb 2027 Q1 FY27 trading update - early read on the credit impairment trajectory, the key swing factor for near-term earnings.
• Q1-Q2 2027 RBA rate cycle signal - a hold or cut decision begins to resolve the cost-of-equity debate central to how this stock should be valued.

Company Description

NAB operates through four divisions. Business & Private Banking is the largest profit engine, anchored by the #1 position in Australian SME lending with roughly 25% market share, and carries margins around 170 basis points above the group average. Personal Banking covers mortgages and consumer credit, where NAB holds a smaller share (around 14%) than the major mortgage lenders. Corporate & Institutional Banking serves large corporates and government through lending, markets and transaction banking. New Zealand operations, run through Bank of New Zealand, add diversification outside the domestic cycle. Together these divisions generated $22.0 billion of operating income in FY26, with the business bank the standout performer.

Where the Growth Is

Business & Private Banking is the single biggest driver of NAB's forward earnings. The division has delivered three consecutive years of above-system loan growth, taking further share in a market NAB already leads. Margins on this book run roughly 170 basis points above the group average, so every dollar of share gain carries outsized profitability. Continued share gains over the next one to three years would be a genuine positive for earnings, though this depends on SME credit quality holding up through the current downturn.

Competitive Position

Australian banking is effectively a four-player market, with NAB and its three major peers controlling around three-quarters of system lending. Regulatory capital requirements and licensing hurdles have only risen since the financial crisis, protecting incumbents from new entrants; no digital or non-bank lender has captured more than a sliver of share in any meaningful product line. Within that structure, NAB's specific edge is business banking, a 25% SME share built on relationship lending that is harder to replicate than mortgage distribution, where price competition is more direct. That share position has proven stable rather than eroding to niche or fintech lenders. We see this position holding for the next seven to ten years, underpinned more by regulation and scale than by any single product advantage.

Management & Capital Discipline

Management under CEO Andrew Irvine, roughly two years into the role, has delivered on measurable cost targets in the large majority of recent reporting periods and kept the business loan book growing faster than the system for three straight years. Capital allocation has been conservative: building credit provisions ahead of the cycle (collective provisions now 1.40% of credit risk-weighted assets) rather than running them down, maintaining the dividend reinvestment plan at an appropriate discount, and avoiding value-destructive acquisitions. One honest observation: this leadership team has not yet navigated a full credit downturn, and several senior executive changes over the past 18 months add execution risk at exactly the point the cycle is turning.

Financial Position

NAB's core capital ratio (CET1, the bank's highest-quality buffer against losses) sits at 12.07%, around 157 basis points above the regulatory minimum. Liquidity coverage of 135% and a funding ratio of 116% both comfortably exceed requirements. Credit provisions of $6.8 billion provide a buffer against the current downturn, and the bank carries an AA-/stable credit rating. NAB is well placed to absorb a deeper credit cycle than our base case assumes without needing to raise capital or cut the dividend.