The Last 16 Cents of the Fuel Tax Holiday Disappear on Sunday Night

Put a note in your phone for this weekend. At midnight on Sunday 2 August, the final slice of the fuel excise relief that has been propping up your hip pocket since April gets clawed back, and every litre of petrol and diesel sold in Australia goes back to carrying the full 52.6 cents of federal excise. Treasurer Jim Chalmers confirmed it this week, and he left no wriggle room. "It was never the government's intention for that to be permanent," he said.

So that's the news. But here's what's really going on behind it: the price at your local servo will not leap 17.6 cents at 12:01am on Monday, and the reason why is one of the more interesting quirks of how fuel tax actually works in this country. Understanding it will spare you from panic queuing on Sunday afternoon, and it might save you real money too.

How we got to this weekend

Rewind four months. The Middle East conflict had sent international fuel prices vertical, and the ACCC's own monitoring shows capital city petrol was sitting roughly 78 cents a litre higher at the start of April than it is today. Diesel was more than a dollar higher. Filling an ordinary hatchback was suddenly a $130 exercise.

Canberra's answer, announced on 30 March, was emergency excise relief. From 1 April, motorists paid 32 cents a litre less tax at the bowser. That relief was always designed to shrink in stages. Stage one arrived on 1 July, when half of it was withdrawn. The ACCC calculates that step added up to 17.6 cents a litre once GST was stacked on top, and it's the main reason July was such a rough month at the pump, with capital city petrol climbing 28 cents across the month.

Sunday night is stage two, and it's the same arithmetic again. The remaining 16 cents of excise comes back, GST applies on top of excise (yes, a tax on a tax, perfectly legal and older than most of us), so the full effect works out at up to 17.6 cents a litre. On a 60 litre tank, that's about $10.50. The government's own estimate of what the relief was worth: around $11 a fill.

Why Monday morning won't be carnage

Here's the bit most people don't realise. Fuel excise isn't collected at the pump. It's paid at the terminal gate, the point where fuel leaves the big wholesale storage terminals and heads out on tankers to individual servos. That means every litre already sitting in a station's underground tanks on Sunday night was taxed at the old, cheaper rate. Your servo doesn't pay a cent more for that fuel just because the calendar ticked over.

We've run this exact experiment before. In March 2022, the Morrison government halved excise from 44.2 to 22.1 cents during the Ukraine price shock, and that cut expired on 28 September the same year. Plenty of motorists braced for an overnight jump. It never came. The ACCC pointed out at the time that roughly 700 million litres of fuel taxed at the lower rate was still sitting in the country's terminals and servo tanks, and the increase flowed through over a couple of weeks as stations restocked, not overnight.

Expect the same pattern this time, with two caveats. Nothing legally stops a retailer lifting the board price early, and some will try it on. And in the big east coast cities the discounting cycle can disguise the tax entirely, because a cycle jump and a tax rise landing in the same week just looks like one ugly Monday.

A tax closing in on its century

Let's put this in perspective. Australia first slapped an excise on petrol in 1929, to pay for roads. That road funding link was quietly severed decades ago, and these days the money simply flows into general revenue, billions of dollars a year the budget depends on. The rate is indexed to inflation twice a year, which is why it only ever travels in one direction. John Howard famously froze indexation in 2001, when the rate was just over 38 cents and motorists were revolting. The freeze lasted 13 years before being switched back on, and the steady creep since is how we arrived at 52.6.

Compared with other countries, we sit somewhere in the middle of the pack. The Brits cut their fuel duty by 5 pence in 2022 as a temporary measure, then kept extending it year after year because no chancellor wanted to own the headline of putting it back. The Americans haven't touched their federal petrol tax since 1993. It works out to under 8 Australian cents a litre, which goes a long way to explaining those American road trip videos where someone fills a giant pickup for 60 bucks.

What to actually do before Sunday

The practical upshot for your wallet comes down to where your city sits in its price cycle right now.

The Australian Institute of Petroleum's latest weekly figures put the national average for unleaded around 182 cents a litre, and the ACCC had capital city diesel at just under 215. Add the full tax step and, all else being equal, petrol averages push toward the high 190s and diesel toward the $2.30 mark over the coming weeks. The NRMA reckons comparatively soft crude oil prices should cushion part of the blow, and here's hoping they're right.

But the cycle matters more than the tax. In Sydney, Melbourne, Brisbane and Adelaide, the gap between the top and bottom of the discounting cycle regularly tops 30 cents a litre, nearly double what the excise change will add. If your suburb is near the bottom of its cycle this week, filling up before Sunday is a genuine double win. If prices near you have just spiked, chasing a cheap tax fill at a cycle peak is a false economy. Check the price trends for your city before you decide, and if timing is your thing, our guide to the best time to fill up covers each capital's rhythm. Perth folk have it easiest: the weekly cycle there still bottoms out on Tuesdays, so this weekend a Saturday fill comfortably beats waiting for Wednesday.

Diesel drivers, your calculation is simpler. Diesel doesn't really cycle, so a full tank before Sunday night is 16 cents a litre you will simply never pay. It has been the uglier story all year too, still 38 cents above its level before the conflict by the ACCC's count, against 9 cents for petrol, so it pays to compare diesel prices around you rather than defaulting to the usual servo. Petrol drivers can do the same with unleaded petrol prices across the country.

The quiet story underneath

One more thing worth filing away. While petrol was artificially cheap these past four months, something curious happened: electric vehicles hit a record 23.3 per cent of new passenger vehicle sales in June. The excise base, that dependable river of revenue, is shrinking as the fleet electrifies, and this year's budget papers again contained no road user charge for EVs. Industry contacts tell me Treasury understands this maths perfectly well. Every temporary excise holiday makes the eventual conversation about how we pay for roads a little harder to avoid.

The takeaways for this week:

Fuel taxes rarely make the front page until they move, and this one has moved three times in four months. Now you know exactly what's coming, which puts you a tank ahead of most of the country.