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Trump's Iran war is costing Australian households $42 a week

Forty-two dollars a week. That’s what Trump’s Iran adventure is costing the average Australian household, and most people don’t even realise it yet.

John Naughton highlighted a neat calculation on his blog this week, drawing on methodology from the Financial Times. The IEA reported the UK consumed 4.4 million terajoules of oil and gas in 2024. Convert that to barrels, apply the roughly US$40 per barrel price increase since the Iran war kicked off, and British households are about £22 billion worse off. Around 0.7% of national income, gone.

I wanted to know what the same calculation looks like for Australia. The answer is worse. But first, it’s worth pausing on the war itself.

An illegal war with no exit

This is not a sanctioned military operation with defined objectives and international backing. The US launched strikes against Iran without Congressional authorisation and without a UN Security Council mandate. No coalition of allies was assembled. No clear military objective was articulated beyond vague gestures at Iran’s nuclear programme, a programme that multiple rounds of diplomacy had been managing, imperfectly but manageably, until Trump tore up the JCPOA in his first term.

The result has been entirely predictable. The Middle East is more volatile, not less. Iran’s hardliners are strengthened, not weakened. Oil infrastructure across the Gulf is at higher risk than at any point since the Tanker War of the 1980s. Shipping insurance premiums through the Strait of Hormuz have spiked. And the global oil price now carries a fat war premium that flows directly into the cost of living for every oil-importing nation on Earth.

Worse, Trump is showing every sign of fleeing the scene. Having created the mess, the administration is already distancing itself from the consequences, pivoting to domestic talking points and leaving allies, partners and the region itself to deal with the fallout. No ownership. No plan. No endgame. Just a shattered status quo and a bill that lands on everyone else’s doorstep.

The numbers

Australia consumed approximately 1.15 million barrels of oil per day in 2024. Strip out LPG (about 21,000 barrels per day) since we source that domestically, and you’re left with roughly 1.12 million barrels per day of oil products. That’s 410 million barrels a year.

Multiply by the US$40 per barrel war premium and the hit is US$16.4 billion. Convert at this week’s AUD/USD rate of 0.688 and that becomes A$23.9 billion per year.

Against Australia’s nominal GDP of around A$2.65 trillion, that’s 0.9% of national income. Worse than the UK’s 0.7%.

Divide by Australia’s 10.9 million households (per ABS projections for 2025-26) and you land on A$2,190 per household per year. Or roughly A$42 per week.

Averages lie

That $42 figure is an average, and averages are deceptive. A household in inner Melbourne with two e-bikes and a tram stop out front barely notices. A family in regional Queensland running two cars, commuting 80km round-trip on roads with no public transport alternative, is getting hammered.

But even the inner-city household isn’t escaping this. Oil-derived products are embedded in everything. The diesel that moves freight. The jet fuel that moves people. The petrochemical feedstocks that become plastics, fertilisers, pharmaceuticals and bitumen. When oil goes up $40 a barrel, it doesn’t just show up at the bowser. It shows up in the price of groceries, building materials, airfares and the cost of getting anything from a warehouse to a shelf.

This is the insidious part. The direct fuel cost is visible and painful. The second-order inflationary effects are invisible and arguably worse. They compound through supply chains, erode margins for small businesses and push up the cost of living in ways that are hard to attribute but impossible to avoid.

Australia’s particular vulnerability

The UK comparison is instructive but the structural differences matter. Australia imports virtually all of its refined fuel. We closed most of our refineries over the past two decades and now depend on a long, thin supply chain stretching back to refineries in Singapore, South Korea and Japan. When global oil prices spike, we have almost no buffer.

We’re also a big country with dispersed population centres, which means we burn more fuel per capita moving people and goods around than most developed economies. The UK, by contrast, is compact, heavily urbanised and has extensive rail infrastructure. Their 0.7% GDP hit is painful. Our 0.9% hits a population with fewer alternatives. EV sales are soaring but they’re a long-term transition not a quick fix.

What this actually means

Nearly one per cent of national income, redirected from Australian pockets to global oil markets, because of an illegal war that has nothing to do with Australian interests and everything to do with American domestic politics. That’s A$23.9 billion that won’t be spent in local businesses, won’t flow into household savings and won’t support the consumer spending that is needed to prop up a sluggish economy.

And for what? Iran’s nuclear programme isn’t dismantled. The regime isn’t toppled. The region is less stable than before the first missile launched. The only measurable outcome is a wealth transfer from ordinary households in allied nations to oil producers, defence contractors and the geopolitical chaos that breeds more of both.

Forty-two dollars a week doesn’t sound catastrophic. But for households already stretched by housing costs, insurance premiums and grocery inflation, it’s one more weight on a pile that’s getting dangerously heavy. The bill for someone else’s recklessness, posted to every letterbox in the country.

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