Why is fuel so expensive in Australia?

Australian drivers spent 2026 watching the board climb. As at 26 August 2026, average petrol across the five largest cities was around $2.06 a litre and diesel around $2.50, according to federal fuel statistics drawn from ACCC monitoring. That's roughly 35c a litre above where petrol sat before the Middle East conflict began in late February, and about 74c higher for diesel.

The frustrating part is how little of that is visible at the bowser. Here's the full fuel price breakdown for Australia — what each component is, who sets it, and which parts you can actually do something about.

The Australian fuel price breakdown

Take a litre of unleaded priced at 206c. It splits roughly like this:

Component	Approx. per litre	Who sets it
Fuel excise	53.7c	Federal government (indexed each February and August)
GST	~18.7c	Federal government — 1/11 of the total price
Wholesale fuel cost	~100–115c	International benchmark prices and the AUD/USD rate
Freight, storage and retail margin	Remainder	Wholesalers and your local retailer

So about 72c of a 206c litre is federal tax — a little over a third. There is no state fuel tax anywhere in Australia, which is why the tax component is identical in Kalgoorlie and Hobart. Our guide to fuel excise in Australia works through the tax side in detail.

Australia imports almost all of its fuel

This is the structural answer, and it's the one that gets left out of most explanations.

Australia once had eight oil refineries. It now has two — Ampol's at Lytton in Brisbane and Viva Energy's at Geelong — and together they supply only around 20% of national fuel demand. Roughly 90% of Australia's liquid fuel arrives as refined product on ships, mostly from Asian refineries.

That has a direct consequence for what you pay. Australian pump prices don't track the cost of producing fuel in Australia, because barely any is produced here. They track international refined benchmarks: Singapore Mogas 95 for petrol, Singapore Gasoil for diesel, and Saudi contract prices for LPG. When an Asian refinery has an outage or a shipping route gets disrupted, that reaches your local servo whether or not anything changed in Australia.

It also explains the diesel gap. In the week to 26 August 2026, Brent crude sat around US$94 a barrel, up 29% on pre-conflict levels — but Singapore Gasoil was up about 80%. Diesel didn't get dearer because crude got dearer. It got dearer because the specific refined product Australia buys got scarce.

Australia holds strategic reserves against this exposure. As at 25 August 2026 they covered about 41 days of petrol and 36 days of diesel at normal consumption — above pre-conflict levels, but a thin buffer for a country at the end of a long supply chain.

The exchange rate moves the price quietly

International benchmarks are priced in US dollars. Australia buys in Australian dollars. So every move in the AUD/USD rate changes the landed cost of a litre before anyone in Australia has touched it.

A weaker Australian dollar makes imported fuel dearer even when the benchmark price hasn't moved at all. The reverse doesn't reliably work in your favour, though — as the ACCC points out, a stronger dollar only shows up at the pump if benchmark prices hold steady and local factors don't push in the other direction at the same time.

Tax: 53.7c a litre, plus GST on top of it

Fuel excise is a flat federal charge per litre — not a percentage — currently 53.7 cents a litre on petrol and diesel from 3 August 2026. It's indexed to CPI twice a year, in February and August.

Much of the 2026 price story is excise policy. The government cut the rate to 20.6c/L from April, extended relief at 36.6c/L through July, then let it end on 2 August. The return to the full indexed rate added 17.1c a litre in excise, or close to 18.8c at the pump once GST is applied.

And GST is applied — to the whole pump price, excise included. You pay 10% GST on the tax as well as on the fuel. That compounding is why the total federal take is around 72c rather than the 53.7c most people assume.

Why your servo is dearer than the one down the road

Everything above is national. None of it explains why two stations three minutes apart can differ by 30c a litre — and that gap is where the real money is.

Retail margin is set station by station. It reflects site costs, local competition and what the operator thinks the area will bear. Freeway and highway sites charge a convenience premium because they can. Suburbs with a dense cluster of servos price harder than towns with one.

Layered on top, in the larger capitals, are petrol price cycles: prices climb sharply over a few days, then grind down over weeks before repeating. The ACCC is explicit that these are the result of retailer pricing decisions, not movements in wholesale costs. Cycles don't occur in Canberra, Hobart or Darwin, and diesel and LPG don't cycle anywhere.

One caveat worth knowing in 2026: since the conflict began in late February, the ACCC reports that price cycles have mostly not occurred in Sydney, Melbourne, Brisbane and Adelaide. Perth's weekly cycle has kept running. If you've been waiting for a trough on the east coast that never arrived, that's why.

Worth dismissing one myth while we're here: the ACCC's analysis found that price rises before public holidays and long weekends were, on average, no larger than ordinary price cycle increases. Holiday fills feel dearer mostly because you're buying more fuel.

Is fuel actually more expensive in Australia than overseas?

Less than the complaints suggest. Australian pump prices sit comfortably below most of Western Europe and well above the United States, and the difference is mostly tax — Australia's flat excise plus 10% GST is modest next to European fuel duties, and there are no state fuel taxes on top.

What Australia genuinely does have is distance: a long import chain from Asian refineries, then long domestic freight runs to move fuel inland. That's why remote and regional prices run well above capital city prices, and why the gap widens the further you get from a fuel terminal.

When will fuel prices go down in Australia?

Honestly, nobody can tell you — it depends on international benchmarks and the exchange rate, and anyone forecasting either with confidence is guessing.

What is predictable is the lag. The ACCC puts it at around two weeks for benchmark movements to work through to city bowsers, and longer in regional areas. So a fall in international prices this week shows up at your servo late in the month, not tomorrow.

There's also more room to move than the headlines imply. Retail prices in late August 2026 were around 52c a litre below their late-March peak for petrol, and 72c below for diesel. Prices had already fallen a long way, even while sitting above pre-conflict levels.

Meanwhile the controllable part hasn't changed. The tax is fixed, the benchmark is set overseas, and the exchange rate is nobody's to steer — but the 20–40c spread between the cheapest and dearest servo near you is real and available every single fill. Our guide to finding the cheapest fuel in Australia covers how to use the official state feeds, fuel prices by state explains how reporting works where you drive, and the fuel cost calculator will tell you what a cheaper station is worth over a year.

This is general information about fuel pricing and fuel tax, current at September 2026, not financial or tax advice. Prices and excise rates change — excise is re-indexed each February and August. Always confirm the price at the pump.

Frequently asked questions

Why is fuel so expensive in Australia right now?

Two things stacked up in 2026. International refined fuel benchmarks rose sharply after conflict in the Middle East began in late February, and temporary fuel excise relief ended on 2 August, restoring the excise rate to 53.7 cents a litre. As at 26 August 2026, average petrol in the five largest cities was about 35 cents a litre above pre-conflict levels, and diesel about 74 cents higher.

What percentage of an Australian petrol price is tax?

Around 35%. On a litre priced at 206c you pay 53.7c of fuel excise plus roughly 18.7c of GST — about 72c in federal tax. GST is charged on the whole pump price, so you pay 10% GST on the excise as well.

Why is diesel more expensive than petrol in Australia?

Petrol and diesel track different international benchmarks. Australian petrol follows Singapore Mogas 95 and diesel follows Singapore Gasoil, and through 2026 the gasoil benchmark rose far more sharply — up about 80% on pre-conflict levels in late August, against 29% for Brent crude. Diesel also doesn't move in price cycles, so there's no cheap trough to wait for.

Is fuel more expensive in Australia than in other countries?

Australian pump prices sit well below most of Western Europe and well above the United States. The main reason is tax: Australia charges a flat federal excise and 10% GST, with no state fuel taxes, which is modest by developed-country standards. What Australia does have is a long import supply chain and long domestic freight distances.

Does Australia still refine its own fuel?

Only a small share. Australia has two remaining refineries — Ampol's at Lytton in Brisbane and Viva Energy's at Geelong — which together supply around 20% of national fuel demand. The rest arrives as refined product on ships, which is why Australian prices follow Asian refined benchmarks rather than domestic costs.

When will fuel prices go down in Australia?

Nobody can forecast it reliably, because it depends on international benchmark prices and the Australian dollar. What is predictable is the lag: changes in benchmark prices take about two weeks to reach city bowsers and longer in regional areas. Retail prices had already fallen well below their late-March 2026 peak by late August.

Why did petrol prices go up today at my local servo?

A same-day jump is almost never a tax or crude oil change. In Sydney, Melbourne, Brisbane, Adelaide and Perth it is usually the sharp restoration phase of a petrol price cycle, which the ACCC attributes to retailer pricing decisions rather than wholesale costs. Elsewhere it is typically one retailer moving and nearby stations following.