Petrol Rose 28 Cents in July and Only 16 of Them Were the Tax
Something happens at midnight on Sunday that will touch every fuel bill in the country, and plenty of motorists still have no idea it is coming. The last slice of Australia's temporary fuel excise relief expires on 2 August, and from Monday the full tax of 52.6 cents lands on every litre of petrol and diesel that leaves a fuel terminal. Here's what's really going on, because the tax is only half the story of what July just did to your wallet.
The final instalment lands Monday
A quick recap for anyone who missed the earlier chapters. When conflict in the Middle East sent oil markets into a spin in late February, Canberra responded on 1 April by slashing fuel excise from 52.6 cents a litre to 20.6 cents. That 32 cent lifeline was halved on 1 July, when the rate stepped back up to 36.6 cents. On 3 August the training wheels come off entirely and the full 52.6 cent rate returns.
Factor in GST, which you pay on top of excise (yes, a tax on a tax, more on that shortly), and the government's own fact sheet puts the pump impact of Monday's change at up to 17.6 cents a litre.
Anyone hoping for a last minute reprieve should let that go. Asked about extending the relief a third time, the Prime Minister indicated it was "not in our planning". You can see why from the budget papers. The April cut cost around $2.9 billion in forgone revenue in three months, and Treasury expects fuel excise collections to climb from $22.78 billion this financial year to $28.26 billion next year. That rebound only happens if the full rate comes back.
What July actually did to your fuel bill
Here's where it gets interesting. The 1 July step should have added about 17.6 cents a litre at the very most. According to the ACCC's weekly monitoring report of 24 July, what actually happened was worse. Average petrol across the five largest cities hit 179.5 cents a litre on 22 July, up 28.0 cents since 30 June. Diesel did far worse again, reaching 214.9 cents, a rise of 41.4 cents in barely three weeks.
So where did the rest come from? Straight off the water. The ACCC tracks the international benchmark prices Australian importers actually pay, and in the three weeks to 22 July the refined petrol benchmark rose about 10 Australian cents a litre while the refined diesel benchmark jumped roughly 34 cents. The conflict premium in world fuel markets is sitting squarely on diesel, the fuel that moves ships, trucks and armies.
To put this in perspective, the tax explains roughly two thirds of petrol's July rise. For diesel prices it explains well under half. If you run a diesel ute or tow a caravan for a living, the war premium has quietly cost you more this month than the Treasurer has.
A tax with more history than you'd think
Fuel excise has been part of Australian life since 1929, when it was introduced to pay for roads, and governments have been tinkering with it ever since. The closest parallel to this moment came in March 2022, when the Morrison government halved the then 44.2 cent excise after Russia invaded Ukraine. Commentators lined up to declare no government would ever have the nerve to put it back. It returned to the full rate that September with barely a murmur, mostly because world oil prices had fallen far enough to swallow the difference.
That's the uncomfortable contrast with 2026. This time the tax is being restored while international prices are still climbing, so motorists cop both at once. The July numbers are what that looks like in practice.
And the tax on a tax business? GST is charged on the full pump price, excise included. Once the 52.6 cent rate returns, a touch over 5 cents of the GST in every litre is tax you are paying on another tax. It has been debated and grumbled about for a quarter of a century and it is not going anywhere.
What Monday actually means at your servo
The rise will not hit every bowser at one minute past midnight. Excise is levied when fuel leaves the terminal, so your local servo sells down the stock already in its tanks at the old rate first. People in the industry will tell you full pass through usually takes a few days to a week, with busy metro sites repricing fastest because they restock most often.
Price cycles complicate the picture. Sydney, Melbourne, Brisbane and Adelaide run discounting cycles that swing prices 20 to 30 cents regardless of what Canberra does. A cycle trough this weekend could partly mask Monday's jump, and a cycle peak could pile straight on top of it. Perth runs on FuelWatch's locked daily pricing, where Tuesday is reliably the cheap day and Wednesday brings the weekly jump. Check where your city sits before deciding to fill early. Our best time to fill up guide covers each capital, and the price trends page shows the movement week by week.
Diesel drivers get the rough end again. Diesel barely cycles, so there is no discount window to ride, and it is carrying the larger international increase on top of the tax. Regional motorists, who skew heavily to diesel and were already paying well north of 200 cents in many towns, will notice Monday most of all.
One thing you should not do is panic buy. Supply is in decent shape. The ACCC notes national fuel stocks remain above average and the Geelong refinery is back above 90 per cent of normal capacity. There is no shortage coming, just a price change.
Spare a thought for freight too. The heavy vehicle road user charge, the trucking industry's equivalent of excise, has been wound back up on the same timetable. That cost lands on the pallet before it lands on the shelf, which is how a fuel tax quietly finds its way into your grocery trolley by spring.
The bigger picture
The excise is not done moving either. The rate is indexed to inflation twice a year, in February and August, so 52.6 cents is a floor rather than a ceiling. And hanging over all of it is the question Canberra keeps dodging: fuel excise is a shrinking pot as electric vehicles spread, this year's Budget deferred a national road user charge for them, and the motoring lobby wants one on the table by 2027. Monday's restoration papers over that hole for now, nothing more.
The takeaways
- The full 52.6 cent excise returns from Monday 3 August, worth up to 17.6 cents a litre at the pump once GST is included.
- Expect the rise to filter through over several days as servos restock, not all at once on Monday morning.
- Petrol in the five largest cities already averages 179.5 cents and diesel 214.9, according to the ACCC's latest weekly report.
- Most of July's diesel rise was the international war premium rather than the tax, and that part can fall as quickly as it rose if the conflict eases.
- Time your fill around your city's price cycle, not just the tax date. Buying at a cycle peak can cost you more than beating the excise saves.
Fuel taxes only make headlines twice: when they are cut and when they come back. Now you know what the second one looks like from the inside. Keep an eye on this space, because the next argument, over who pays for the roads once petrol cars are the minority, is already warming up.
