Stubborn Underlying Inflation Keeps Prospect of RBA Interest Rate Hikes Alive
Recent data shows headline inflation in Australia has dipped, but underlying inflation remains stubbornly high. Driven by strong domestic demand, this persistent price pressure indicates that the Reserve Bank of Australia may still consider further interest rate hikes to stabilize the economy.
Highlights
- •Headline inflation dropped to 4.0% in May, but underlying inflation remains high at 3.6%.
- •The decline in headline figures was primarily driven by temporary fluctuations in petrol prices.
- •Homegrown, service-based inflation in sectors like rent and healthcare remains a significant concern.
- •The RBA warns that persistent inflationary pressure may necessitate further interest rate hikes.
Recent economic data released by the Australian Bureau of Statistics suggests that despite a slight decline in headline numbers, underlying inflation remains persistently high. For May 2026, the annual headline inflation rate moderated to 4.0%, down from 4.2% in April. While this decrease may offer a glimmer of hope to homeowners burdened by high mortgage repayments, financial experts warn against premature optimism.
The Persistence of Underlying Inflation
A closer examination of the data reveals that the drop in headline figures is largely attributable to fluctuating petrol prices rather than a broad-based cooling of the economy. The Reserve Bank of Australia (RBA) primarily monitors underlying inflation, often referred to as the trimmed mean, to gauge the true state of price pressures. Unlike headline CPI, this measure excludes highly volatile items to provide a clearer view of domestic demand.
Currently, underlying inflation sits at 3.6% for May, reflecting a month-over-month increase. This level remains significantly above the RBA’s target of approximately 2.5%. The core issue lies in domestically driven price pressures—often termed non-tradeables—which are distinct from global price movements. While the cost of imported goods may fluctuate, services such as rent, healthcare, education, and dining out continue to exhibit strong, sustained price growth.
Monetary Policy Implications
The RBA employs the cash rate as its primary mechanism to manage economic activity and stabilize prices. When local demand remains robust, the bank may find it necessary to implement further interest rate hikes to curb spending and alleviate inflationary pressure. Temporary relief at the petrol pump, driven by short-term government policies and global oil market shifts, does not address the underlying domestic demand that is fueling the current economic cycle.
Furthermore, the temporary nature of current fuel excise relief implies that headline inflation figures could see a rebound in the coming months as these measures are adjusted. This potential volatility underscores why central bank policymakers focus intently on the structural components of inflation rather than temporary headline dips.
With the cash rate currently held at 4.35%, the RBA has signaled that it remains prepared to take additional action should inflation fail to show signs of returning to target levels. Market analysts observe that the persistence of homegrown price growth keeps the possibility of further rate increases very much on the table, suggesting that the current period of monetary tightening may not be nearing an end just yet.
