Australian banks earn about 2% net interest margin on a A$2.2 trillion mortgage book – and turn it into 13%+ returns on equity. The arithmetic behind it explains almost everything about the sector.
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Banking & Financial Services
Expert guides, analysis and tool comparisons on Banking & Financial Services from the kurums.com Startup desk — written for business decision-makers and updated as the market moves.
- 5 guides
- Updated Jul 31, 2026
Latest in Banking & Financial Services
The Hayne Royal Commission: What It Found and What Actually Changed
The 2018 banking Royal Commission found institutions had put short-term profit ahead of honesty. It ended the vertically integrated wealth model – but left Australia’s four-bank market structure intact.
Why Australia Has Only Four Big Banks: Inside the Four Pillars Oligopoly
Four banks hold roughly 70% of Australian banking and three quarters of a A$2.2 trillion mortgage market. How the four pillars policy created that structure – and who is finally taking share.
Macquarie Group: Inside the Millionaires Factory and Its Two-Engine Model
Macquarie earns two-thirds of its income offshore and manages A$941 billion. Inside the annuity versus markets split, the commodities business other banks abandoned, and the profit-share culture.
Commonwealth Bank: How a Government Bank Became Australia’s Most Valuable Company
CBA earns A$10.3 billion a year on a 2.08% net interest margin. Inside the deposit funding moat, the technology spend, the AUSTRAC penalty and the longest-running valuation argument on the ASX.
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