Australia’s biggest banks are still sitting on hundreds of billions of dollars in customer savings accounts that earn no interest, even after multiple cash-rate increases pushed borrowing costs higher and lifted returns available elsewhere in the financial system.
Australia big banks keep no-interest deposits
That widening gap matters because it helps explain why bank margins have stayed resilient despite the end of ultra-cheap money. When central banks raise rates, lenders usually face a faster pass-through on loans than on deposits, especially if customers leave cash in transaction accounts paying nothing. The result is a transfer from savers to banks that supports net interest income, but also increases the political and consumer scrutiny on how fairly banks share higher policy rates.
Sentiment Indicators
The issue is most acute for the big four lenders, whose balance sheets are built around huge, low-cost deposit bases. Even as the Reserve Bank of Australia has taken rates to an 18-year high, a large share of customer balances remains parked in accounts that offer no interest at all. For banks, that is a major funding advantage. For households, it means the benefit of tighter monetary policy is only partially flowing through to savings.
The market backdrop underscores why the timing matters. Policy rates across major economies remain elevated, with U.S. Treasury yields and Fed policy still above pre-pandemic norms, while global investors are again focused on deposit beta — the proportion of rate increases that banks pass on to savers. In Australia, where household balance sheets are highly exposed to mortgage costs, any shortfall in deposit pricing can widen the squeeze on consumers just as debt servicing costs rise.
That dynamic helps explain recent performance in Australian bank shares. Commonwealth Bank, Westpac and ANZ have all traded with strong relative momentum at various points this year, reflecting confidence in their earnings power, while technical indicators have alternated between overbought and consolidating conditions. Commonwealth Bank’s 50-day moving average sits below its recent price but above the 200-day average, while its RSI has hovered near elevated levels, pointing to investor optimism around earnings durability. Westpac and ANZ have also recovered from earlier weakness, consistent with expectations that deposit franchises and net interest income remain solid even as lending growth slows.
But the upside for banks comes with a longer-term risk. If savers become more price-sensitive, they can shift money into term deposits, money-market funds or rival banks offering better returns, forcing lenders to lift deposit rates and eroding margin support. That is where the economics become more contested: banks benefit from inertia, but the longer zero-interest balances persist, the more likely regulators, politicians and consumer groups are to question whether lenders are keeping too much of the rate-hike windfall.
For investors, the near-term read-through is two-sided. The persistence of no-interest balances supports earnings and dividends, especially for banks with dominant retail franchises. Yet it also leaves the sector exposed to reputation risk and possible funding pressure if competition for deposits intensifies. The next catalyst will be whether borrowers and savers start to reprice their cash behavior more aggressively as higher-for-longer rates bite deeper into household budgets.
| Entity | Gains | Losses |
|---|---|---|
| Big four banks | ▲Lower funding costs | ▼Consumer backlash |
| Savers | ▲Potential future rate offers | ▼Missed interest income |
| Borrowers | ▲None | ▼Higher debt servicing costs |
| Shareholders | ▲Stronger net interest income | ▼Margin pressure if deposits reprice |
