The US-Iran agreement that reopened the Strait of Hormuz has done something no domestic policy announcement has managed in months: it has pushed Australia’s inflation outlook in a more favourable direction without costing the government a dollar.
Brent crude fell approximately 4 per cent in the 24 hours following the deal, dropping to around US$83.50 a barrel. That is still above the US$70 to US$72 range it occupied before the conflict erupted in late February 2026, but it is a long way from the US$126 per barrel peak the market reached when Iranian restrictions on tanker traffic through the Strait of Hormuz threatened roughly 20 per cent of global seaborne oil supply. The geopolitical risk premium that drove that spike is unwinding quickly.
The timing matters because Australia is approaching a policy inflection point. The federal government halved the fuel excise from 1 April to 30 June 2026, reducing the rate by approximately 26.3 cents per litre. Combined with a suspension of the Heavy Vehicle Road User Charge and a GST windfall returned by states and territories, the total relief reached around 32 cents per litre at its peak. That measure expires on 1 July. Without the fall in global oil prices, the return of the full excise could have pushed pump prices up by 30 to 40 cents per litre almost overnight. With Brent now falling as supply concerns ease, the two forces partially cancel each other out.
The net effect for motorists from July is likely to be far more modest than feared a few weeks ago. Petrol prices in Sydney and Perth had already eased to around 167 cents per litre by mid-June with the excise cut in place and global prices falling. Whether prices rise, hold steady or continue lower from 1 July will depend on how quickly Middle Eastern supply returns to market and how the Australian dollar behaves against the US dollar over the same period.
The conflict began when US and Israeli airstrikes on Iran in late February triggered Iranian retaliation through the Strait of Hormuz, the narrow passage through which a substantial share of the world’s seaborne oil moves. The disruption was one of the largest to global energy supply in decades. Brent crude moved from roughly US$72 per barrel to above US$100 in weeks, eventually peaking near US$126. Australia, which imports more than 90 per cent of its refined fuel needs, felt the effect almost immediately.
Pre-conflict petrol had been averaging around 181 to 182 cents per litre nationally. By March, prices had risen further amid supply uncertainty and some panic buying, before the government’s excise cut took effect in April and began to push prices lower. The relief was real. Headline CPI for April 2026 came in at 4.2 per cent annually, down from 4.6 per cent in March, with a monthly fall in automotive fuel prices a meaningful contributor to that moderation.
The excise cut carried a price tag estimated at more than $2 billion across its three-month life. The government has been clear it does not plan to extend it. It was always described as a temporary bridge rather than a structural change to fuel taxation.
Economist Stephen Koukoulas has argued publicly that the oil spike should have been viewed as a temporary external shock rather than embedded domestic inflation, and that the RBA risked overtightening in response to what he described as an “oil price blip”
The Reserve Bank raised the cash rate to 4.35 per cent at its May 2026 meeting, with energy prices among the factors contributing to its concern about persistent inflation. Its May Statement on Monetary Policy flagged headline inflation potentially peaking near 4.8 per cent in mid-2026, with upside risk if energy costs remained elevated.
Economist Stephen Koukoulas has argued publicly that the oil spike should have been viewed as a temporary external shock rather than embedded domestic inflation, and that the RBA risked overtightening in response to what he described as an “oil price blip”. That argument was debatable in May, when there was no certainty the conflict would resolve quickly. It appears more persuasive today.
The peace deal does not alter the underlying inflation picture the RBA has been managing for the past two years, but it changes the near-term trajectory. Faster disinflation from falling energy prices, combined with the end of the fiscal stimulus embedded in the excise cut itself, gives the board more room to consider when rate cuts might be appropriate. A drop in headline inflation driven by lower petrol prices will not, by itself, convince a cautious central bank that underlying price pressures have been contained. It does, however, remove one of the active upward pressures and gives policymakers data moving in the direction of easing rather than tightening.
The resolution of the Iran conflict removes a supply shock. It does not resolve the structural inflation questions that predated it. Michael Howell, managing director of GL Indexes and a closely watched analyst of global liquidity conditions, argued in a recent interview that the Federal Reserve’s 2 per cent inflation target is “fantasy” and that the Fed will likely need to raise rates again within the next twelve months regardless of short-term energy price movements. His argument is centred on liquidity conditions, AI-driven capital spending and a late-cycle dynamic in global asset markets that is largely independent of Middle Eastern geopolitics.
If he is right, the relief Australia gets from cheaper oil is real but temporary. A global environment of persistent inflation and rising bond yields will eventually reassert itself through higher import costs, a weaker Australian dollar and sustained pressure on the RBA to keep rates elevated. The oil shock’s resolution smooths the path for the next few months. It does not change the destination.
The most immediate question is how pump prices move in the first two weeks of July as the excise returns. If global oil continues to fall toward the US$75 to US$80 range that some analysts now project for a partially normalised Middle East supply picture, the pass-through from the tax restoration may be largely offset at the bowser. If global prices stabilise around current levels, motorists will likely absorb a net rise of 10 to 15 cents per litre, which is manageable but still noticeable.
The RBA’s next scheduled meeting is in August. By then, the June and July CPI data will be clearer, and the board will be able to assess whether the energy-driven disinflation is durable or whether, as Koukoulas suggests, it was always a temporary distortion in a rate-setting environment that was already tilted towards eventual easing.
The peace deal removes one source of inflation pressure at a time when households and the Reserve Bank both need relief. Whether that relief lasts depends on forces far beyond Canberra, including oil markets, global liquidity and the durability of the agreement itself.
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