Background: Commonwealth Bank is Australia’s biggest bank, serving more than 25 million customers and generating over $10 billion in profit last financial year. Not bad ay! But despite its scale, the banking giant has now referred itself to police and the corporate regulator after uncovering a major issue in its home loan book.

What happened: CBA identified up to $1 billion in potentially fraudulent home loans, with some applications allegedly using AI-generated payslips, draft tax returns and fake income documents. The issue was largely concentrated in broker and referral channels.

What else: Most of the loans are still being repaid and secured against property, so CBA isn’t currently out of pocket, but the scale raises major questions about lending controls and broker oversight.

What's the key learning?

💡Growth through intermediaries can accelerate revenue, but it also multiplies oversight risk. More than 77% of new home loans now come through brokers and referral partners.

💡The good part for banks is that this model expands distribution and brings in more customers - less people actually working for the bank but still making sales. But of course, without the overriding control, it also introduces incentive risk.

💡Brokers are typically paid upfront when a loan settles as well as a trail commission, creating financial pressure to get deals approved.  So there’s a clear financial incentive to get the deal across the line.