The clock has started ticking again on global oil inventory depletion
In the shadow of American missiles and Iranian reprisals, a distant conflict has found its way into Australian petrol stations and mortgage calculations. Oil prices, already climbing toward levels not seen since April's painful peak, carry within them the quiet threat of a fourth Reserve Bank rate rise — a burden that would fall on households already stretched thin. The world's geopolitical tremors and the domestic cost of living have rarely felt so directly connected, and the next few days of diplomacy may matter as much to Australian families as any decision made in Canberra.
- US airstrikes on Iran sent Brent crude surging from $70 to $85 a barrel overnight, with economists warning $100 is reachable within ten days if the conflict holds.
- Australian diesel prices have already climbed to 190 cents a litre at the pump, and a federal fuel excise relief measure set to expire August 2 will add another 16 cents automatically — regardless of what happens in the Middle East.
- The Reserve Bank, having already raised rates three times this year to 4.35%, now faces renewed inflation pressure, with markets pricing an August hike at 23% odds and a December hike above 50%.
- Consumer confidence, which had been cautiously recovering, has reversed sharply — economists say the figures would have looked considerably better had the conflict not escalated when it did.
- A narrow diplomatic window of roughly one week has emerged as the critical threshold: resolution could stabilise oil and spare households another rate rise; prolonged conflict could push crude toward $150 and squeeze budgets from both ends.
When American missiles struck Iranian targets on Tuesday, the reverberations reached further than the Middle East. Brent crude climbed to US$85 a barrel and West Texas Intermediate crossed US$80 — both up sharply from around US$70 just weeks prior. For Australians, the distance between a geopolitical flashpoint and a petrol station sign is shorter than it might seem.
Economists are watching the clock with unusual urgency. If the Washington-Tehran standoff does not ease within days, oil could breach US$100 within ten weeks and push toward US$150 beyond that. Commonwealth Bank energy strategist Vivek Dhar noted that global oil inventories are already being drawn down, and the arithmetic is unforgiving. When crude hit US$110 in April, Australians were paying nearly 260 cents a litre for unleaded and 320 cents for diesel. Wholesale diesel has already climbed from 177 cents in early July to 186 cents by Tuesday, with pump prices in major cities sitting around 190 cents.
The pressure compounds further on August 2, when the federal government's fuel excise relief expires — adding 16 cents a litre automatically, regardless of what happens overseas. The NRMA's Peter Khoury warned that if elevated oil prices persist beyond a week, the increase at the bowser will become impossible to ignore.
For the Reserve Bank, the concern is inflation — the persistent, sticky kind that forces its hand. Westpac's Matthew Hassan said the bank's economists now expect another rate rise in August, partly driven by the oil shock. The RBA has already raised rates three times this year to 4.35 percent. A fourth rise would deepen the squeeze on mortgage holders and cost-of-living-pressured households. Markets have responded: August hike odds have jumped to 23 percent since the airstrikes resumed, and the probability of a rise by December now exceeds 50 percent.
Consumer confidence, which had been showing tentative signs of recovery, has already retreated. The Westpac-Melbourne Institute tracker published Tuesday showed households had been growing more optimistic — until the conflict escalated. AMP economist My Bui predicted that higher oil prices combined with rising rate-hike expectations would drag confidence back toward April's lows. Employment has not softened enough to ease the pressure, and price stickiness remains.
The next week is the hinge point. Diplomacy that moves faster than crude could stabilise prices and weaken the inflation case for another rate rise. If the conflict deepens, Australian households may face higher petrol bills and higher mortgage repayments simultaneously — a double pressure arriving just as government relief runs out.
The price of oil jumped sharply on Tuesday morning as American missiles struck Iranian targets and President Trump announced a new naval blockade. Brent crude, the international benchmark, climbed to US$85 a barrel, while West Texas Intermediate crude crossed US$80. Just weeks earlier, both had been trading near US$70. The spike matters because it reaches into Australian petrol tanks and, from there, into the Reserve Bank's calculations about whether to raise interest rates again.
Economists are watching the clock. If the conflict between Washington and Tehran does not cool within days, they warn, oil could breach US$100 a barrel within ten days and push toward US$150 within ten weeks. That kind of sustained price shock would ripple through Australian inflation in ways the central bank cannot ignore. Vivek Dhar, an energy strategist at Commonwealth Bank, described it plainly: global oil inventories are being drawn down again, and the math is unforgiving. When crude hit US$110 a barrel in April, Australian drivers paid nearly 260 cents a litre for unleaded petrol and 320 cents for diesel. We are not there yet, but the trajectory is clear.
The fuel market is already responding. Wholesale diesel prices have climbed from 177 cents a litre in early July to 186 cents by Tuesday. At the pump in major cities, diesel now sits around 190 cents. These are not theoretical numbers—they appear on signs at service stations where people fill their tanks before work. Peter Khoury, speaking for the NRMA, acknowledged that markets had already priced in some possibility of negotiation failure, but warned that if oil prices stay elevated for more than a week, fuel will become noticeably more expensive. There is also a harder deadline: the federal government's fuel excise relief, which has been holding prices down, expires on August 2. When it does, prices will jump another 16 cents a litre automatically.
This matters to the Reserve Bank because inflation is the thing it is supposed to control. Matthew Hassan, head of macro-forecasting at Westpac, said the bank's economists now expect another rate rise in August, driven partly by the oil shock. Higher fuel costs feed into persistent inflation—the kind that makes the central bank uneasy. The RBA has already raised rates three times this year, to 4.35 percent. A fourth rise would deepen the squeeze on households carrying mortgages and struggling with cost-of-living pressures. Markets have begun pricing in the risk: betting odds on an August rate hike have jumped to 23 percent since the airstrikes resumed, and the odds of a hike by December now exceed 50 percent.
Consumer confidence, which had been showing tentative signs of recovery, has already taken a hit. The Westpac-Melbourne Institute confidence tracker, published Tuesday, showed households had been growing less fearful of rate rises and more optimistic about their family finances—until the conflict escalated. Hassan noted that without the geopolitical shock, the month's confidence figures would have looked considerably better. Most Australians remain pessimistic on balance and expect another rate rise within a year. My Bui, an economist at AMP, predicted that higher oil prices combined with the growing likelihood of a rate hike would drag confidence back toward the lows seen in April. The employment market has not yet deteriorated enough to ease pressure, and price pressures remain sticky. All of this points toward the RBA moving again in August.
The next week or so will be critical. If the US and Iran can reach some form of understanding, oil prices may stabilize and the inflation case for another rate rise weakens. If the conflict deepens, crude will climb, fuel will follow, and Australian households will face both higher petrol bills and higher mortgage payments. The federal government's excise relief expires in less than three weeks regardless, adding another layer of pressure. For now, economists are watching oil prices and watching the calendar, waiting to see whether diplomacy can move faster than crude.
Notable Quotes
The clock has started ticking again on global oil inventory depletion— Vivek Dhar, Commonwealth Bank energy commodities strategist
It will feed into their unease that this inflation will be persistent— Matthew Hassan, Westpac macro-forecasting head, on Reserve Bank concerns
The Hearth Conversation Another angle on the story
Why does oil in the Middle East matter so much to Australian interest rates?
Because oil is priced globally in dollars, and when it gets expensive, fuel gets expensive everywhere. Australians fill their cars with petrol, and when that costs more, it pushes inflation up. The Reserve Bank's job is to control inflation, so if fuel prices spike, they're more likely to raise rates to cool down the whole economy.
But couldn't the government just keep the fuel excise relief going?
They could, but it's temporary—it expires August 2. And there's a limit to how much the government can subsidize fuel. Eventually the bill becomes too large. Right now, that relief is masking some of the pain, but it's running out.
What does a fourth rate rise actually mean for someone with a mortgage?
If you're paying a mortgage at 4.35 percent and rates go up another 0.25 percent, your repayments increase. For someone with a $500,000 loan, that's roughly $1,250 more per year. It compounds. People are already stretched.
So the conflict in Iran is directly connected to whether Australians can afford their homes?
Not directly—but it's connected to the inflation that makes the Reserve Bank raise rates, which then affects mortgage costs. It's a chain. Oil shock leads to fuel inflation, which leads to rate hike, which leads to higher repayments. That's why economists are watching the Middle East so closely.
What would resolve this quickly?
A ceasefire or diplomatic agreement within days. If the US and Iran can de-escalate, oil prices fall back, inflation pressure eases, and the case for another rate rise weakens. The window is narrow—maybe a week before prices breach $100 and the momentum becomes harder to stop.
And if it doesn't happen?
Then oil keeps climbing, fuel gets expensive, inflation stays sticky, and the RBA raises rates in August. Households already worried about mortgages face both higher fuel bills and higher repayments. Consumer confidence, which was just starting to recover, gets hammered again.