RBA Hikes Rates to 4.35% in May 2026 as Iran War Drives Australian Inflation Toward 4.8%

RBA Delivers Third 2026 Rate Hike: Cash Rate Now at 4.35% as Energy Inflation Bites

The Reserve Bank of Australia raised the official cash rate to 4.35% at its May 2026 two-day board meeting, delivering the third interest rate increase of the year as central bank policymakers battle an inflation surge driven overwhelmingly by the global energy price shock from the Iran war.

The RBA's Statement

Following the May decision, the RBA board noted: "The conflict in the Middle East has resulted in sharply higher fuel and related commodity prices, which are already adding to inflation." The board acknowledged that domestic inflation was already elevated before the conflict, and that recent energy price increases are expected to push it "higher over the next year or so."

The RBA's May 2026 Statement on Monetary Policy (SMP) projected headline CPI inflation would peak at 4.8% in the June quarter 2026 — approximately 3.7 percentage points above the baseline forecast that had been in place before the war.

Rate Trajectory in 2026

The RBA has hiked rates three times in 2026, taking the cash rate from 3.85% (start of year) to 4.35%. Australia's big four banks are divided on what comes next:

The RBA's next scheduled announcement is June 16, 2026.

Impact on Households

Australia's heavily mortgaged households are feeling significant strain. Variable rate home loans have repriced sharply following the three 2026 hikes, adding hundreds of dollars per month to repayments for the average borrower. Aussie Broker data shows lenders reviewing their own rates independently, with the pass-through from RBA hikes now near-complete across major lenders.

GDP Growth Slowing

The RBA's SMP also forecast GDP growth slowing over 2026 in the baseline scenario, as the earlier support from strong domestic demand begins to wane under the weight of higher borrowing costs and Iran-war-driven cost pressures. Private demand grew strongly in 2025 but is expected to ease through 2026. The unemployment rate is forecast to rise to 4.7% by mid-2028.

Conclusion

Australia faces the classic central bank dilemma of 2026: a war-driven supply-side inflation shock that monetary policy cannot cure, combined with a slowing economy that cannot easily absorb further rate rises. With Westpac forecasting two more hikes and the RBA meeting June 16, Australian borrowers face an anxious summer.