National Australia Bank (ASX: NAB) shares fall 4.6% as A$1.8bn cash earnings collide with mortgage slowdown

National Australia Bank Limited (ASX: NAB) has reported A$1.83 billion of third-quarter cash earnings, up 2% from the first-half quarterly average excluding a major accounting item, yet its shares fell 4.62% on August 17 after Australian home-loan applications dropped 15% from the previous quarter. Revenue increased 2%, business lending remained strong and credit impairment charges fell, but the mortgage pipeline weakened just as higher interest rates and broader economic uncertainty are beginning to show up in early-warning credit indicators. National Australia Bank also reported higher watch loans even though its headline non-performing exposure ratio improved, creating a more complicated asset-quality picture than the lower bad-debt charge suggests. The market response indicates that investors are looking beyond current earnings toward whether Australia’s largest business lender can preserve loan growth, margins and credit quality if household borrowing weakens further.

National Australia Bank recorded unaudited statutory net profit of A$1.81 billion for the June quarter, while cash earnings excluding the first-half large notable item increased 4% from the corresponding quarter of 2025. Gross loans and acceptances rose to A$817.4 billion from A$804.2 billion at March, while customer deposits increased to A$685.4 billion from A$673.5 billion. Business lending expanded 2% during the quarter, including 4% growth within Business & Private Banking, reinforcing the bank’s traditional strength in commercial lending even as Australian housing demand softened.

The stock closed at A$39.46, down A$1.91, after trading between A$39.10 and A$40.05. Compared with the August 10 close of A$41.22, National Australia Bank shares are down approximately 4.3% over five trading sessions, while the stock is only about 1% below its A$39.85 July 17 close. The shares remain approximately 20% below their A$49.45 52-week high but about 11% above the A$35.48 annual low. With roughly 3.12 billion shares outstanding, the A$1.91 one-day decline represents close to A$6 billion of equity value erased during the August 17 session.

Why did National Australia Bank shares fall 4.6% when third-quarter cash earnings increased?

The earnings number itself was not particularly weak. Cash earnings of A$1.83 billion increased 2% against the first-half quarterly average after excluding the A$949 million after-tax effect of the large notable item connected with National Australia Bank’s changed software-capitalisation policy. Revenue increased 2%, while underlying profit was broadly stable and lower credit impairment charges helped lift bottom-line cash earnings.

What changed was the forward signal coming from home lending. Australian mortgage applications fell 15% from the second quarter, even though actual home-lending balances still grew approximately in line with the wider system when the run-off of Advantedge is excluded. That distinction matters because outstanding loan balances reflect business already written, while applications provide an earlier indication of demand entering the pipeline.

National Australia Bank is not experiencing that slowdown in isolation. ANZ Group Holdings Limited reported a 12% decline in home-loan applications in its own June-quarter update, while Westpac Banking Corporation previously disclosed a roughly 20% fall. The pattern suggests that weaker mortgage demand is becoming a broader Australian banking-sector issue rather than simply a National Australia Bank execution problem.

The August 17 market reaction therefore appears to reflect the possibility that current bank earnings are being supported by margins and existing loan books while one source of future volume growth is losing momentum. That becomes especially relevant for banks trading on historically elevated valuations, because slower housing credit growth can reduce the earnings growth investors are willing to capitalise at premium multiples.

Is National Australia Bank’s 1.79% net interest margin weaker than the headline number suggests?

National Australia Bank reported a group net interest margin of 1.79%, down two basis points from the first-half quarterly average. On the surface, declining net interest margin alongside slower mortgage applications looks like an uncomfortable combination because the bank could face both weaker lending growth and pressure on the amount it earns from each dollar of interest-bearing assets.

The underlying picture is more favourable. Excluding Markets & Treasury, National Australia Bank said net interest margin actually increased two basis points, primarily because higher earnings on deposit and capital replicating portfolios outweighed lending competition and smaller negative deposit effects. Revenue excluding Markets & Treasury rose 3%, compared with 2% at group level.

That suggests the two-basis-point reported margin contraction should not automatically be interpreted as deterioration across the core banking franchise. Treasury and markets activity influenced the headline result, while customer banking margins proved more resilient.

The challenge is sustainability. Higher domestic interest rates can support earnings on deposits and capital, particularly where deposit pricing does not immediately move one-for-one with benchmark rates. Those same rates can eventually weaken borrowing demand and increase stress among households and businesses. National Australia Bank’s quarter already contains evidence of both effects: resilient core margin economics alongside falling housing applications and higher watch loans.

That makes the margin story less about whether 1.79% becomes 1.81% in the next quarter and more about whether the bank can preserve profitability without pushing customers toward competitors or adding excessive credit risk.

Is business banking now carrying more of National Australia Bank’s growth as mortgages slow?

National Australia Bank’s business franchise remains the strongest part of the volume story. Business loans increased from A$345.1 billion in March to A$352.4 billion in June, an increase of approximately A$7.3 billion in three months. Housing loans increased from A$445.7 billion to A$451.4 billion, adding about A$5.7 billion.

Business lending therefore accounted for more than half of the A$13.2 billion quarterly increase in total gross loans and acceptances. Within Business & Private Banking, lending grew 4%, while transaction-account balances excluding offsets increased 3%. These numbers reinforce why National Australia Bank’s leadership position in business banking remains strategically important when household credit becomes less reliable as a growth driver.

Deposits also kept pace reasonably well. Customer deposits increased by approximately A$11.9 billion during the quarter compared with the A$13.2 billion increase in gross loans. On a simple dollar comparison, deposit growth was equivalent to roughly 90% of the quarterly increase in lending balances. That is not a statement that each new loan was directly funded by a corresponding new deposit, but it shows that balance-sheet growth was accompanied by substantial deposit expansion rather than relying exclusively on additional wholesale funding.

National Australia Bank nevertheless remains an active wholesale borrower. The group raised A$30.2 billion of term wholesale funding during the nine months through June, including A$6.1 billion of Tier 2 capital. Its liquidity coverage ratio averaged 134%, while the net stable funding ratio stood at 115%, both above regulatory minimums.

The strategic question is whether business lending can continue growing at high-single-digit annual rates if economic stress broadens. National Australia Bank’s business loan book was 9% larger than a year earlier at June, substantially faster than housing growth of 4%. That creates an attractive growth engine, but it also makes the bank increasingly sensitive to the financial health of Australian companies.

Are higher watch loans a more important warning than National Australia Bank’s falling non-performing ratio?

Headline asset quality improved during the June quarter. Non-performing exposures declined to 1.50% of gross loans and acceptances from 1.52% in March. Within that total, impaired assets fell three basis points to 0.30%, while defaulted but not impaired exposures increased one basis point to 1.20%.

Credit impairment charges were A$299 million, down 15% from the first-half quarterly average. Individually assessed provision charges totalled A$180 million, primarily relating to Australian unsecured and non-retail portfolios, while collective provision charges were A$119 million.

Those figures look relatively benign until the forward indicators are considered. National Australia Bank said watch loans increased because of current and potential stress among customers who remain performing. It also increased the ratio of collective provisions to credit risk-weighted assets from 1.35% to 1.36%. The bank retains almost A$2 billion of forward-looking provisions to absorb potential deterioration in the outlook.

The combination is important. A borrower can become financially stressed before missing enough payments to enter the non-performing category. Watch loans therefore provide an earlier warning signal than headline arrears or impaired assets.

National Australia Bank is effectively saying that realised credit deterioration remains manageable, but the population of customers requiring closer attention has increased. That is not the same as forecasting a wave of bad debts, particularly while the bank continues carrying substantial forward-looking provisions. It does mean the next few quarters will test whether higher interest rates and weaker mortgage activity remain manageable macroeconomic headwinds or begin converting into materially higher impairment charges.

The first-half result already included a A$300 million increase in economic and sector-specific adjustments associated partly with greater downside weighting and potential stress related to the Middle East conflict. No further change to those economic assumptions or scenario weightings was made during the third quarter.

Can A$450 million of productivity savings offset National Australia Bank’s rising technology costs?

Expenses provide another important tension. Excluding the first-half large notable item, operating expenses increased 4% from the first-half quarterly average. National Australia Bank attributed the increase partly to the changed treatment of software investment, which means a higher proportion of expenditure is now recognised immediately rather than capitalised, as well as higher technology spending, seasonal salary costs, depreciation, investment and payroll remediation.

Management continues targeting more than A$450 million of productivity savings during FY26 and expects operating-expense growth to remain below the 4.6% recorded in FY25, excluding large notable items.

This matters because banking revenue growth of 2% leaves relatively little room for costs to run persistently above revenue. If expenses continued increasing around 4% while revenue remained near 2%, the cost-to-income relationship would gradually move against shareholders unless stronger volumes, margins or productivity benefits appeared elsewhere.

Technology spending cannot simply be eliminated to protect near-term earnings. National Australia Bank is modernising platforms while also investing in cyber security, digital channels and operational resilience. The relevant question is whether that spending ultimately reduces manual processes, lowers unit costs and improves customer acquisition sufficiently to generate returns above the expense burden.

The A$450 million productivity program therefore becomes a measurable FY26 test rather than generic efficiency language. If savings materially offset investment and wage pressure, National Australia Bank can preserve operating leverage even during slower revenue growth. If expenses continue rising faster than income, investors may become less willing to overlook the weak mortgage pipeline.

Does National Australia Bank’s 11.93% CET1 ratio provide enough protection if credit conditions weaken?

Capital remains one of the strongest parts of the update. National Australia Bank’s Level 2 Common Equity Tier 1 ratio increased from 11.65% in March to 11.93% in June, comfortably above management’s operating target of more than 11.25%. Cash earnings added 41 basis points to the ratio during the quarter, while growth in credit risk-weighted assets reduced it by 13 basis points.

The June ratio does require one timing qualification. National Australia Bank said the FY26 interim dividend, equivalent to a 58-basis-point reduction in CET1, and the A$1.8 billion capital generated through the dividend reinvestment plan, equivalent to a 40-basis-point increase, were not reflected in the June quarter ratio because both effects occurred in July. The net impact of those two items alone would therefore be negative before considering subsequent earnings and other movements.

Even so, the bank enters a more uncertain credit environment with capital above its internal operating threshold and large forward-looking provisions already established. That provides capacity to absorb a moderate deterioration without immediately making the balance sheet the central investor concern.

The more interesting capital question is whether continued business-loan growth consumes additional risk-weighted assets faster than earnings replenish capital. Credit risk-weighted assets increased A$4.3 billion during the quarter, including A$5.4 billion from volume growth, primarily business lending, partly offset by foreign-exchange movements and other factors.

National Australia Bank therefore faces a familiar banking trade-off. Faster business lending supports revenue and market share, but also consumes capital and potentially increases future credit exposure. The current 11.93% CET1 ratio gives management room to navigate that trade-off, but the buffer becomes more valuable if watch loans continue rising.

What are the key takeaways from National Australia Bank’s third-quarter FY26 update?

• National Australia Bank reported A$1.83 billion of third-quarter cash earnings, up 2% from the first-half quarterly average excluding the large notable item.
• Unaudited statutory net profit reached A$1.81 billion, while revenue increased 2% and underlying profit was broadly stable.
• Australian home-loan applications fell 15% from the second quarter, becoming the main negative catalyst behind the August 17 market reaction.
• Business lending increased 2% during the quarter and 9% year on year, with Business & Private Banking lending rising 4%.
• Customer deposits increased A$11.9 billion to A$685.4 billion, while gross loans and acceptances rose A$13.2 billion to A$817.4 billion.
• Reported net interest margin fell two basis points to 1.79%, although margin excluding Markets & Treasury improved by two basis points.
• Credit impairment charges fell to A$299 million and non-performing exposures improved to 1.50%, but watch loans increased.
• National Australia Bank retains almost A$2 billion of forward-looking provisions for potential stress in the economic outlook.
• The CET1 capital ratio increased to 11.93% at June, above the bank’s operating target of more than 11.25%.
• National Australia Bank shares closed 4.62% lower at A$39.46 on August 17, erasing roughly A$6 billion of equity market value in one session.

What will determine whether National Australia Bank can recover from the August 17 sell-off?

National Australia Bank’s third-quarter update is not a conventional weak earnings result. Cash earnings increased, business lending remained robust, customer deposits expanded, core net interest margins were resilient and the headline non-performing loan ratio improved. The bank also retains strong capital and almost A$2 billion of forward-looking provisions.

What unsettled investors is the direction of the early indicators. Mortgage applications are down 15%, watch loans are higher and the bank itself has highlighted uncertainty created by higher domestic interest rates and broader economic pressures. Those numbers matter because they can move before reported loan balances, interest income or bad debts show the full effect of changing customer behaviour.

Business banking could provide an important counterweight. National Australia Bank added about A$7.3 billion of business loans during the quarter and continues growing substantially faster in that segment than in housing. If Australian companies remain resilient and credit losses stay contained, the commercial franchise can support group growth even while mortgage demand cools.

The weaker outcome would be a convergence of both risks: housing applications remain depressed while higher watch loans begin moving into impaired categories across business and household portfolios. In that scenario, revenue growth could soften just as impairment expenses begin rising.

That makes the November 5 FY26 results particularly important. Investors will be able to test whether the 15% mortgage application decline translated into weaker home-loan balances, whether watch-loan growth stabilised, whether the A$450 million productivity target restrained operating expenses and whether National Australia Bank finished the year with its core margin resilience intact.

The August 17 sell-off shows that A$1.83 billion of quarterly cash earnings is no longer enough by itself to sustain confidence. National Australia Bank now needs to demonstrate that today’s strong business-loan growth and capital position can absorb tomorrow’s potentially weaker Australian credit cycle.