NAB Record High|60% Chance the 4th Hike Cracks Its Own Mortgage Book

Chapter 1: Record Earnings, Wrong Headline

National Australia Bank shares hit a record high on Wednesday after the bank reported unaudited first-quarter cash earnings of $2.02 billion, up from $1.74 billion a year earlier. The same morning, the Australian Bureau of Statistics released May inflation data showing the trimmed mean — the Reserve Bank's preferred measure — rising to 3.6%, above the 3.5% consensus forecast. Those two facts arrived together, and they point in opposite directions. The bottleneck is the bank's own mortgage book: NAB's earnings gain is directly funded by the rate path that is simultaneously loading its customers toward default. The record share price is pricing the tailwind. It is not pricing the pipeline. The trimmed mean result immediately shifted market odds on an August rate hike from roughly 30% to 60%. That single repricing is what connects the record high to the stress figure: the same variable — the cash rate — is producing both outcomes at once, and today's CPI print sharpened the tension rather than resolving it. NAB earned $272 million more this quarter than a year ago. The rate cycle that delivered that gain has also added approximately $272 per month to a $600,000 mortgage since the start of 2026. The numbers are almost symmetrical, which is the point: the income the bank is capturing from the rate path is roughly equal to the extra burden being loaded onto the borrowers sitting on its books.

Chapter 2: 1.6 Million Borrowers Inside the Earnings Report

Roy Morgan's May data, released today, shows 29% of Australian mortgage holders — 1,538,000 people — are now at risk of mortgage stress, the fourth consecutive monthly increase and the highest level since the rate-cut cycle of mid-2025. Of those, 1,084,000 are classified as "extremely at risk," meaning even interest-only repayments would consume an unsustainable share of household income. That figure sits at 20.4% of all mortgage holders, well above the two-decade long-run average of 16.4%. Roy Morgan has modelled a fourth hike: if the RBA moves in August to 4.6%, the stressed cohort rises to 1,600,000 — an additional 62,000 households. This is not a tail risk sitting outside the bank's balance sheet. A substantial portion of those 1.6 million are NAB customers. NAB's record NIM expansion is a function of rate volume times margin; the impairment charge runs in the opposite direction through loan provisioning and eventual write-offs. The two are not independent. Housing costs are up 6.5% over the year, electricity up 21.1%, rents up 3.6%. These are not transient items the RBA's trimmed mean strips out — they are the services-driven, domestically generated inflation that the central bank watches most closely, and the same housing stack that determines whether NAB's borrowers can service the rate it is now earning on. The earnings record is real. The question is whether the provisioning requirement that follows it is already baked into the price or is still arriving. The record high, set this morning before the CPI print had been fully digested, suggests the market is pricing the gain and deferring the cost.

Chapter 3: The Institutional Disagreement the CPI Print Did Not Resolve

The May CPI data produced an unusual outcome: a headline number that beat forecasts and a trimmed mean number that missed them, simultaneously. That split is not noise. Headline inflation fell to 4.0%, below the 4.3% consensus, because petrol prices dropped 11.9% after the fuel excise cut and the easing oil price following the US-Iran peace agreement. The trimmed mean, which excludes those volatile items, rose from 3.4% to 3.6% — in the wrong direction. Commonwealth Bank, ANZ and NAB's own economists had already forecast that the RBA was done hiking and would begin cutting in 2027. Their argument is that the economy has already turned: unemployment has risen to 4.5%, consumer confidence is near record lows, and the housing market is slowing. The cheaper petrol is the proof that oil-shock inflation is unwinding. Westpac, by contrast, still carries two more hikes in its forecast before cuts next year. Westpac's economics team, led by former RBA assistant governor Luci Ellis, argues that underlying price pressures remain too broad and wage growth too high — the Fair Work Commission's 4.75% minimum wage lift has benchmarked price expectations for the full year, and today's trimmed mean confirms that services inflation has not broken. Warren Hogan at EQ Economics went further, arguing that a cash rate of 5% or higher may be required. These are not anonymous market participants. They are named institutions and named economists, drawing opposing conclusions from the same data released this morning. The CPI print did not resolve the disagreement. It sharpened it. The RBA has explicitly stated it will be guided by the data. The data today gave both camps something to hold. The hidden assumption in the bull case for NAB — that the rate cycle is ending, so NIM expansion is permanent and impairment risk stays manageable — requires the CBA/ANZ forecast to be right. If Westpac is right, the bank is approaching the point where the next hike triggers impairment provisioning that offsets the margin gain.

Chapter 4: The Two Variables That Decide the Answer

Thursday's May employment data is the immediate next read. The RBA has signalled it will assess both the inflation trend and labour market softening before its August meeting. The April employment report showed 18,600 jobs lost, well below the expected gain of 15,000, and unemployment lifted to 4.5%. If May's print reverses that — the consensus expects a gain of 32,500 jobs and a fall in unemployment to 4.4% — the case for an August hike strengthens materially, and the mortgage stress trajectory Roy Morgan has modelled becomes the base case. If the employment data continues to soften, the argument that the economy has already turned would weigh against a fourth hike, and the credit quality risk for NAB stays in the tail. The holder's question is not whether NAB is a good bank. It is whether today's record high is pricing the NIM tailwind and assuming the soft-employment case resolves the August decision before that data has arrived. The watch-list candidate's question is symmetrical: entry at a record high on a day when the August hike probability just repriced from 30% to 60% is a bet that the earnings momentum outweighs the provisioning risk, and that the employment data tomorrow confirms the softer path. Neither group should treat Thursday's figures as background noise. The single variable that resolves the institutional disagreement — and determines whether NAB's NIM expansion compounds into next quarter or gets eaten by impairments — is whether the labour market is confirming a slowdown or snapping back. Record earnings at a record price with August unresolved: that is where the position sits tonight.