How resilient are Australian banks to a housing crash?
The RBA has modelled an economy with GDP down 3%, unemployment at 6.3% and property prices down 20%. Despite the severe shock, Australian banks' core capital ratio falls only from 12.4% to around 11.6%.
A 20% fall in Australian house prices would cause significant economic pain. But according to the Reserve Bank's latest stress testing, it would still leave Australia's banking system strongly capitalised and capable of continuing to lend.
The RBA's adverse scenario is considerably more severe than simply assuming lower house prices. It combines a 3% fall in GDP, unemployment rising to 6.3%, inflation reaching 7%, the cash rate increasing to 5.6%, and a 20% fall in both housing and commercial property prices.
Despite those assumptions, the banking system's Common Equity Tier 1 capital ratio falls from 12.4% to around 11.6%.
What does 11.6% mean?
Common Equity Tier 1, or CET1, is the highest-quality regulatory capital available to absorb bank losses. It consists principally of shareholders' equity and retained earnings relative to a bank's risk-weighted assets.
Australia's prudential framework deliberately requires banks to hold substantial capital above minimum requirements so those buffers can be used during severe downturns rather than forcing banks to stop lending. The RBA estimates that, even in its adverse scenario, very few banks would need to use a substantial proportion of those buffers.
Why are the losses relatively contained?
One reason is collateral.
More than 90% of banks' non-performing housing loans and more than 50% of non-performing business loans were still considered well secured in June. Even when a borrower is in difficulty, the property securing the loan is generally worth enough to repay the bank if it has to be sold.
Banks also hold loan-loss provisions equivalent to around 0.7% of total credit outstanding.
Capital and liquidity buffers are substantial. At June 2026, Australian banks held a total capital base of about $480 billion, while their liquidity coverage ratio was 133%, comfortably above the regulatory minimum. Annual net profit after tax was $42.5 billion, providing another capacity to absorb losses before capital is depleted.
Funding has also become safer. Since the global financial crisis, Australian banks have reduced their dependence on short-term offshore wholesale borrowing and increased their reliance on domestic deposits. More than half of remaining offshore debt funding now has maturities longer than one year.
None of this means a housing crash would be harmless. Falling prices, higher unemployment and mortgage stress would damage households and economic activity.
But the RBA's conclusion is important: a severe housing downturn does not automatically become a banking crisis.
Australia's banks have been deliberately structured to absorb substantial losses while continuing to provide credit.
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