RBA Interest Rate Hike Alert: How US-Iran War Impacts Fuel Prices & Your Wallet (2026)

The escalating Middle East crisis has once again driven fuel prices higher, causing a significant shift in the Reserve Bank of Australia's (RBA) monetary policy outlook. Market forecasts indicate that the likelihood of an interest rate hike has doubled, posing a challenge for the RBA as it navigates the delicate balance between controlling inflation and supporting economic growth.

The recent breakdown in the fragile ceasefire between the United States and Iran has sent international Brent crude benchmark soaring by 23% in just two weeks, pushing oil prices back towards $90 per barrel. This surge in oil prices has had a direct impact on Australian motorists, with diesel prices jumping 40 cents in July to approximately $2.10 per litre in major eastern cities. The removal of federal government fuel excise relief has further contributed to the rising costs, pushing unleaded petrol prices up by 25 cents to around $1.75.

The global energy market is at a critical juncture, and experts warn that the conflict's impact on oil supplies could have severe consequences. The Strait of Hormuz, a crucial oil transportation route, is now under threat from Iran's declaration of a full-scale war with the United States and potential blockades by Houthi rebels against Saudi Arabian oil. This situation has led to a lack of trust between the warring parties, making it difficult to predict the conflict's trajectory and its impact on the Australian economy.

The RBA's chief economist, Luke Yeaman, predicts that the conflict will drag on for several weeks, potentially longer, and could send a stagflationary pulse through the Australian economy. With inflation already high, traders are increasing bets on the RBA raising interest rates for a fourth time. Markets now place a nearly 30% chance of an interest rate hike on August 12, up from 16% two weeks ago, and the probability of a hike by November has doubled to 80%.

However, Yeaman remains cautious, sticking to his forecast of no more rate hikes this year. He acknowledges that prolonged closure of the Strait of Hormuz and a significant jump in oil prices could lead to higher inflation and slower growth. While a single rate hike may be more likely in the short term, Yeaman warns that calls for multiple hikes are overblown. He predicts that global oil prices could reach $150 per barrel if no negotiated solution is reached by late August or early September, echoing the worst-case scenarios from the initial conflict phase.

The Australian economy is already facing challenges, with slowing growth and a falling housing market. Yeaman forecasts economic growth to slow to 1.5% by the end of the year, down from 2.5% in 2025. A serious escalation in the conflict and prolonged closure of the Strait of Hormuz could further dampen growth.

Daniel Hynes, a senior commodity strategist at ANZ, highlights the structural hit to global supply and the system's fragility, suggesting that oil prices of $80 to $90 per barrel are more realistic. He warns that the $100 per barrel mark could become a reality if the conflict persists and oil inventories continue to drop. Hynes emphasizes the technical limits to how low oil inventories can go without infrastructure breakdown, which are already being breached in the United States, leading to increased competition for seaborne cargoes and higher prices.

In conclusion, the Middle East crisis has significant implications for Australia's economic outlook, particularly regarding interest rate hikes and fuel prices. The RBA must carefully consider the impact of the conflict on inflation and growth, while also being prepared to intervene if oil prices spike further, potentially reinstating fuel excise discounts to shield households from rising costs.

RBA Interest Rate Hike Alert: How US-Iran War Impacts Fuel Prices & Your Wallet (2026)
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