Australia Rate-Hike Odds Double as Oil Shock Lifts Fuel Costs

Australian interest-rate markets are assigning a much greater chance to another increase after renewed fighting in the Middle East lifted crude oil and local pump prices. The repricing confronts the Reserve Bank of Australia with an awkward combination: inflation may accelerate even as households and the wider economy lose spending power.

Brent crude gained 23% over two weeks and moved close to US$90 a barrel after the ceasefire between the United States and Iran broke down. The jump extends Brent’s move above $90 into a direct Australian policy concern because imported fuel costs can spread through transport, retail and business expenses.

Market pricing now places the probability of an RBA increase at almost 30% for August. That compares with 16% two weeks earlier. ANZ calculations also put the chance of an increase by November at 80%, twice the earlier level. Neither figure is a forecast from the central bank; each records how traders are pricing the risk created by faster energy inflation.

The latest assessment was published on July 21, 2026, as motorists were already absorbing a sharp July increase. Diesel climbed by about 40 cents to roughly A$2.10 a litre in major east-coast cities, while unleaded petrol added about 25 cents to approximately A$1.75. Canberra had also begun withdrawing part of its fuel-tax relief at the start of July, compounding the increase. That domestic policy change and the external oil shock landed in the same monthly bill.

Fuel Prices Revive an Inflation Problem

The central bank had raised rates three times before the latest oil shock, and inflation was still running above a comfortable pace. More expensive diesel matters beyond service-station signs. Freight operators, farms and companies that depend on heavy vehicles face costs that can eventually appear in food, construction and other consumer prices. The breadth of that transmission matters because it can keep inflation elevated after the initial crude-price move has faded.

Oil inventories add to the concern. ANZ commodity strategist Daniel Hynes argued that ceasefire-era prices in the low US$70s understated earlier supply damage and the market’s current fragility. He viewed US$80 to US$90 as a more realistic range and said US$100 could come into sight if the conflict worsened over the following weeks.

Technical limits on inventories could intensify competition for seaborne cargoes. In Hynes’s account, US stocks had already crossed some minimum operating levels. If American buyers search farther afield as domestic stocks become difficult to reduce safely, importers in other markets would be bidding against additional demand. Australia would then encounter a global supply squeeze through both crude prices and refined products, even without a physical shortage at local stations.

Higher Inflation Arrives With Slower Growth

Commonwealth Bank chief economist Luke Yeaman kept his forecast for no further rate increases this year, but acknowledged that a long closure of the Strait of Hormuz and another large oil jump would strengthen the case for one additional move. He regarded forecasts for several more increases as excessive because the same energy shock that lifts prices also restrains growth.

CBA’s year-end projection has growth slowing to 1.5%, a full percentage point below the economy’s 2025 pace. Three earlier rate increases and a declining housing market were already weighing on activity. A larger fuel bill leaves households with less money for other purchases and raises operating expenses for employers, adding another brake. Yeaman said a more serious escalation could produce a much sharper slowdown.

This conflict between inflation and output is the RBA’s central constraint. Raising rates can limit demand and reduce the chance that higher fuel costs become persistent price pressure. It cannot produce additional oil, reopen a shipping route or reverse a geopolitical disruption. Holding steady would protect a weakening economy but could allow inflation expectations to harden if pump prices keep climbing. The decision is therefore about the second-round effects of the shock, not control over its source.

August Pricing Depends on the Oil Route

Yeaman said crude could reach US$150 by late August or early September if there were no negotiated solution, though he expected intervention before such an extreme outcome. He also anticipated that Canberra could restore the full fuel-excise discount if another spike threatened households. Such relief would soften the immediate retail cost without resolving the shortage behind it.

The approaching RBA meeting will therefore be shaped by evidence outside the usual domestic data calendar. A sustained reopening of shipping and a retreat in crude would weaken the case embedded in current market prices. Continued disruption would place the August decision between a visible inflation shock and an economy forecast to lose a full percentage point of annual growth.

For motorists, the first transmission has already occurred: July’s diesel and petrol increases arrived before the central bank made its next choice. For policymakers, the 30% August probability and 80% November probability show how quickly the energy market has displaced expectations of stability. Each additional week of restricted supply makes that repricing harder to dismiss as a temporary reaction. That sequence is now visible in both market prices and household budgets, before any further decision from the RBA.