RBA’s fifth hike: mortgage pain and a test of economic common sense

The Reserve Bank’s decision to lift the cash rate to 4.85% — the highest level seen in 18 years — is a clear and unwelcome reminder that the post-pandemic era has not returned to business as usual. This is the fifth increase this year, brought on, according to official commentary, by a jump in inflation to around 4% amid a global oil shock triggered by the war in the Middle East. For ordinary Australians, the immediate consequence is painfully simple: higher mortgage repayments and a tighter household budget. Central banks have a blunt but familiar toolset. When prices run ahead of incomes, raising interest rates is the primary mechanism to cool demand and rein in inflation. But higher rates are not a neutral force. They are a direct tax on borrowers. Millions of households on variable-rate mortgages are now facing another step-up in repayments at a moment when energy prices and other staples are already stretching family budgets. The RBA’s move may be understandable in technocratic terms. Yet it exposes the uncomfortable truth about our economic vulnerabilities. A large portion of the current inflation surge is being driven by an external shock — higher oil prices because of war. That kind of supply-driven inflation does not always respond cleanly to demand-sapping interest-rate rises. The central bank must therefore tread carefully: further aggressive hikes risk tipping indebted households into distress without solving the underlying supply problem driving prices. For mortgage holders, the takeaway is immediate: reassess budgets, prepare for higher service costs and, where possible, seek financial advice on structuring repayments. For households on the cusp, any further tightening will make the difference between postponing plans — a home renovation, university study, a family holiday — and serious financial strain. But responsibility does not lie with the RBA alone. Policymakers in Canberra must acknowledge that shocks from global geopolitics require domestic policy responses beyond interest-rate adjustments. Where inflation stems from disrupted supply chains and commodity prices, targeted measures — short-term relief for vulnerable households, support for energy-efficiency measures, or measures aimed at cushioning transport and logistics costs — are more likely to protect living standards than broad-brush monetary tightening alone. This episode also underscores a longer-term national priority: resilience. Australia needs to reduce exposure to external shocks through diversified energy sources, more resilient supply chains and policies that bolster incomes rather than simply restrain spending. No single institution can fix these issues, but coordinated action from government, regulators and industry would lessen the social cost when international events push prices up. Finally, there is the matter of communication. The RBA must be candid about the trade-offs it faces and the scenarios under which it would step back from further hikes. Households deserve clarity on what the path of rates might look like and why. Vague reassurance only adds to uncertainty. Raising rates was a defensible choice to tackle inflation. Making that choice without a parallel plan to shield the most exposed Australians, and without measures to address supply pressures, risks making ordinary people pay the heaviest price for problems they did not create.