Westpac Shares The ASX 200 Laggard Today: What Happened?

Westpac shares (ASX: WBC) were the worst performer on the ASX 200 today, falling 5.88% to A$35.70 off the back of a sharp slowdown in mortgage application volumes that overshadowed modest earnings growth in the Q3 update.

The WBC share price closed at the low of the day, as the sell-off accelerated through afternoon trade to test a level which has previously acted as both support and resistance through May into early July. Markets were working through the implications of a 20% post-budget drop in mortgage application run-rates, which saw pressure continue through the session.

Implications for the sector were heavy, as the XFJ fell 2.27%, and big four peers CBA down 2.1%, ANZ 1.7% lower, and NAB giving back 2.39%.

What Was In The WBC Update?

The Q3 fiscal 2026 update showed headline numbers that would ordinarily be considered solid, with net profit (excluding notable items) up 2% to A$1.8 billion, and pre-provision profit climbed 1%. Revenue was 1% higher, driven by a 2% increase in net interest income that more than offset a 3% decline in non-interest income.

The bank’s net interest margin held stable at 1.89%, with core NIM edging up one basis point to 1.78%. A stronger contribution from Treasury and Markets operations helped support the overall margin, though this highlighted a shift toward more volatile revenue sources.

Lending grew 2% across the group, with business lending up 4%, institutional lending up 3%, and housing lending advancing 2%. Deposits also rose 2%, whilst the Common Equity Tier 1 capital ratio stood at 12.1%, comfortably above the 11.25% target, supported by 23 basis points from the completed sale of the RAMS mortgage portfolio, which reduced the home loan book by A$15.4 billion.

Mortgage Volumes Drive The Pullback

The detail that triggered the market’s negative reaction lay in the mortgage application data, with average monthly mortgage application volumes falling 11% quarter-on-quarter. The post-budget run rate from mid-May through end-July showed an even steeper 20% decline Q/Q. Applications dropped from approximately 29,000 per month over the full quarter to roughly 26,000 per month in the post-budget period.

The weakness was most pronounced in investor lending, with borrowers reportedly consulting tax advisers and reassessing strategies in response to the federal government’s changes to negative gearing rules for existing properties and capital gains tax concessions. Owner-occupier demand, while more resilient, also softened as affordability pressures intensified.

The federal budget’s property tax changes have emerged as the defining issue for Australian banks in 2026. By ending negative gearing for existing properties and tightening capital gains tax treatment, policymakers have materially reduced the after-tax returns and borrowing capacity of property investors, a segment that has historically accounted for a significant share of new mortgage flows.

What Next?

Bulls appear confident in pointing to the bank’s still-positive earnings growth, stable core margin, and robust capital position. With CET1 at 12.1%, Westpac has ample buffer to weather macro shocks and support shareholder returns. Business and institutional lending continue to grow at healthy rates, providing diversification away from housing.

Bears may feel somewhat validated by the volume data today, as fears about policy-induced structural damage to the mortgage franchise grow.The  Treasury and Markets income is also inherently volatile and lower-quality than core lending revenue, with reliance on this line to offset slowing mortgages seen as unsustainable. With the RAMS sale shrinking the home loan book just as organic growth falters, top-line momentum looks increasingly challenged for 2027 and beyond.

Westpac shares now sit 8.34% lower YTD, and back in the range that followed the budget induced pullback. With the stock having given back most of July’s rally following a day in which market cap shrank A$7bn, there will be plenty of eyes on hold markets trade the name through the remainder of the week.