The gap is widening, and it's a problem.
In the wake of geopolitical upheaval half a world away, Australia now faces the quiet reckoning that always follows distant conflict — higher prices, tighter money, and harder choices for ordinary households. The closure of the Strait of Hormuz has sent fuel costs surging, and Wednesday's inflation data is expected to confirm what many already feel at the petrol pump and the checkout. With the Reserve Bank meeting in days and markets already anticipating a third consecutive rate rise, the country stands at one of those moments where global events and domestic lives converge in the most personal of ways — the monthly mortgage payment.
- Fuel prices spiked sharply after US and Israeli strikes on Iran disrupted one of the world's most vital oil shipping corridors, sending a cost shock racing through the Australian economy.
- Headline inflation is forecast to leap from 3.7% to 4.6% in a single month — the kind of number that forces central bankers to act, regardless of the human cost of doing so.
- Even the RBA's preferred trimmed mean measure is expected to breach 3.5%, sitting well above the bank's 2–3% target band and narrowing the case for holding rates steady.
- Money markets are pricing a 72% chance of another rate hike on May 5, with economists warning inflation may not peak until mid-2026, potentially reaching 4.9% on the headline measure.
- Global equity markets are flashing cautious optimism about a diplomatic off-ramp, but Australian households stretched by successive rate rises have little room left to absorb more pain.
Australia is about to receive its first hard economic data since the Iran conflict reshaped global energy markets. When inflation figures land on Wednesday, they will reflect the real cost of war — not in casualties, but in petrol prices, grocery bills, and mortgage stress.
The numbers are expected to be stark. Commonwealth Bank economists forecast headline inflation jumping nearly a full percentage point in March alone, from 3.7% to 4.6%, driven by fuel price surges after strikes on Iran forced the closure of the Strait of Hormuz. Even the RBA's preferred trimmed mean measure — designed to filter out volatile swings — is tipped to rise to 3.5%, well above the bank's 2–3% target band.
The timing is critical. The data arrives less than a week before the RBA board meets on May 5, with money markets pricing a 72% chance of a third consecutive rate hike. Governor Michele Bullock was already on a tightening path before the conflict began; these figures will almost certainly reinforce that resolve.
NAB's head of Australian economics, Gareth Spence, sees worse ahead — forecasting inflation to peak in the second quarter of 2026, with headline CPI potentially reaching 4.9% and the Middle East shock adding half a percentage point to inflation across the full year.
Global markets offered a flicker of hope, with Wall Street closing at record highs on signals that US-Iran negotiations might ease tensions. But for Australian households already stretched by rising rates, Wednesday's data will be the first clear measure of how much a distant conflict is costing them — and whether relief is anywhere close.
Australia is about to get its first real economic reading since the Iran conflict sent oil prices into the stratosphere. When inflation data drops on Wednesday, it will tell a story that matters to every Australian with a mortgage.
The numbers are expected to be ugly. In March, petrol and diesel prices spiked sharply after US and Israeli strikes on Iran forced the closure of the Strait of Hormuz, one of the world's most critical shipping lanes for oil. That shock has rippled through the economy in ways that are about to become visible. Commonwealth Bank economists are forecasting headline inflation will jump nearly a full percentage point for the month alone—from 3.7 per cent to 4.6 per cent. That's the kind of move that gets central bankers' attention.
But the Reserve Bank doesn't look at headline inflation. It watches trimmed mean inflation, a measure that strips out the most volatile price swings like petrol to get at the underlying trend. Even that figure is expected to climb from 3.3 per cent to 3.5 per cent. The RBA's target band sits between two and three per cent. The gap is widening, and it's a problem.
The timing matters enormously. This inflation data arrives less than a week before the RBA's board meets on May 5 to decide on interest rates. Money markets are pricing in a 72 per cent chance of another 25 basis point increase—the third in a row. RBA Governor Michele Bullock was already worried about inflation before the war started. These numbers will almost certainly push the bank toward hiking again. Commonwealth Bank economists say a rate rise is more likely than not.
The broader economic picture is murkier than the inflation story alone suggests. Other economic data has trickled out since the Middle East conflict began, but this inflation release will be the first comprehensive window into how deeply the war is cutting into Australian wallets. National Australia Bank's head of Australian economics, Gareth Spence, expects the pain to get worse before it gets better. He's forecasting inflation will peak in the second quarter of 2026, with trimmed mean reaching 3.9 per cent and headline inflation hitting 4.9 per cent. Over the full year, he estimates the Middle East cost shock will add half a percentage point to inflation cumulatively.
On global markets, there's a different mood. Wall Street closed Friday with the S&P 500 and Nasdaq both hitting record highs, suggesting investors believe negotiations between the US and Iran might ease tensions or at least produce a ceasefire. The S&P 500 gained 56.68 points to close at 7,165.08, while the Nasdaq climbed 398.09 points to 24,836.60. The Dow fell slightly, dropping 79.61 points to 49,230.71. Australian markets were quieter. The ASX 200 slipped 6.9 points to 8,786.5, with the All Ordinaries down 17.8 points to 9,006.4. Futures suggested modest weakness ahead.
For Australian households, the real test is what happens next. If inflation keeps climbing and the RBA keeps raising rates, mortgage payments will keep rising. The inflation data on Wednesday will be the first hard evidence of how much the Iran conflict is costing ordinary Australians—and whether the RBA's resolve to fight inflation will hold firm even as it makes borrowing more expensive for millions of people already stretched thin.
Notable Quotes
We expect trimmed mean inflation to be cumulatively 0.5 percentage points higher over the course of 2026 due to the cost shock emanating from the Middle East.— Gareth Spence, NAB head of Australian economics
The Hearth Conversation Another angle on the story
Why does this particular inflation number matter more than the others the RBA will see this year?
Because it's the first one that captures the full economic shock of the war. The RBA has been worried about inflation for months, but now they have to decide whether to keep hiking rates into an economy that's being hit by an external cost shock they can't control.
Can the RBA actually do anything about oil prices?
Not directly. But they can raise rates to cool demand and try to stop inflation expectations from becoming unanchored. The problem is that if they keep hiking while petrol prices are already squeezing household budgets, they're making life harder for people who are already struggling.
What's the difference between headline and trimmed mean inflation that keeps getting mentioned?
Headline is what you see at the petrol pump and the supermarket—the raw number. Trimmed mean strips out the most volatile stuff to show the underlying trend. The RBA cares about trimmed mean because it's more stable, but right now even that's climbing and it's well above their target.
If Wall Street thinks the war might end soon, why are Australian markets so flat?
Markets price in different things. Wall Street is betting on a ceasefire or negotiations. But Australian investors know that even if the war ends tomorrow, oil prices don't snap back instantly. The damage to inflation is already baked in for months.
What happens to mortgage holders if the RBA keeps hiking?
Their payments go up. If the RBA raises rates three times in a row, someone with a million-dollar mortgage is paying thousands more per year. That's the real pressure on the RBA—they need to fight inflation, but they're also watching households get squeezed.
Is there any scenario where the RBA doesn't hike in May?
Only if something dramatic changes between now and then. But Commonwealth Bank economists are saying a hike is more likely than not. The inflation data on Wednesday will probably seal it.