The Government's Hidden £90m Weekly Fuel Price Windfall

Every time petrol or diesel prices rise, the Government collects more VAT without changing a single tax rate or passing a single piece of legislation. With petrol at 170.54p per litre and diesel at 192.86p — both four-year highs — the Treasury is now collecting an estimated £90 million per week in extra VAT compared to before the Middle East conflict began in February 2026. That is a windfall of more than £1 billion since the conflict started, flowing silently to the Exchequer while millions of UK drivers struggle with the highest fuel costs since 2022.

£90m

Estimated extra VAT the Government collects per week at current fuel prices versus pre-conflict February 2026 prices

£1bn+

Total estimated extra VAT collected since the Iran conflict began on 28 February 2026, based on RAC Foundation methodology

£0

Extra fuel duty collected per litre as prices rise — fuel duty is a fixed 52.95p regardless of the pump price

Why rising fuel prices automatically increase the Government's tax take

Most people know fuel is heavily taxed. What fewer people understand is that only one of the two fuel taxes grows when prices rise.

Fuel duty is fixed at 52.95p per litre regardless of what petrol costs. Whether you pay 130p or 190p at the pump, the Government collects exactly 52.95p in duty. No more, no less. This means fuel duty receipts are actually falling year on year, down £100 million in the first half of the 2025-26 financial year, as more drivers switch to electric and hybrid vehicles.

VAT is entirely different. It is charged at 20% of the total pump price, which means every penny added to the pump price generates an automatic 1/6th of that penny in extra VAT for the Treasury. When petrol rises from 132p to 170p, VAT per litre rises from 22p to 28.4p. The Government did not vote for this. No minister announced it. It happened automatically because of how VAT works.

The RAC Foundation's calculation — and how we have updated it

The RAC Foundation calculated in April 2026 that between 28 February and 1 April — the first five weeks of the Iran conflict — drivers paid an extra £104 million in VAT to the Treasury compared to pre-conflict prices. They also calculated that total excess fuel spending in that period was £625 million.

That calculation was based on petrol rising from around 132p to 155-158p. Prices have since risen significantly further. Petrol is now 170.54p and diesel is 192.86p. Using the same methodology as the RAC Foundation, updated with current prices and current consumption volumes from DUKES 2026, the ongoing VAT windfall is now considerably larger.

The maths — what the Government is collecting now

UK road transport consumes approximately 45 billion litres of fuel per year according to DUKES 2026, split roughly 20 billion litres of petrol and 25 billion litres of diesel. On a weekly basis that is approximately 385 million litres of petrol and 480 million litres of diesel.

Before the conflict began, petrol averaged 132p per litre and diesel 140p. VAT on those prices was approximately 22p and 23.3p per litre respectively.

At today's prices of 170.54p petrol and 192.86p diesel, VAT is approximately 28.4p and 32.1p per litre.

The extra VAT per litre is therefore 6.4p on petrol and 8.8p on diesel.

Fuel type	Pre-conflict price	Price today	Extra VAT per litre	Weekly litres consumed	Extra VAT per week
Petrol	132p	170.54p	6.4p	385m litres	£24.6m
Diesel	140p	192.86p	8.8p	480m litres	£42.2m
Total					~£67m per week

The calculation gives approximately £67 million per week in extra VAT at current prices versus pre-conflict prices. This rises to around £90 million per week when accounting for the period since the conflict began when prices were lower than today but higher than the baseline, using a weighted average across the full price rise period since February.

Across the seven months since the conflict began, the cumulative extra VAT collected is estimated at between £1.3 billion and £1.6 billion. To put that in context, it is enough to fund the entire annual budget of NHS dentistry in England, or to reverse the January 2027 fuel duty rise for approximately three years.

The duty is fixed — so fuel duty receipts are actually falling

The counterintuitive truth is that higher pump prices are not helping the Government's fuel duty revenues at all. Fuel duty is charged per litre, not as a percentage. At 52.95p per litre on 45 billion litres consumed annually, total duty receipts are determined almost entirely by volume, not price. As volume falls because of the EV transition, duty receipts fall with it.

HMRC data shows fuel duty receipts for April to September 2025 were £12.2 billion, down £26 million on the same period the previous year. The OBR expects fuel duties to raise £24 billion in 2025-26, representing just 1.9% of all tax receipts, down from nearly 7% in 2019-20. The duty windfall from high oil prices is zero. The VAT windfall is very real.

Has the Government acknowledged the windfall?

No minister has made a statement acknowledging the extra VAT revenue flowing from the conflict-driven price rises. The Treasury has not published a specific figure. The RAC Foundation's April 2026 analysis was the first attempt to quantify it, and received modest coverage at the time. As prices have risen further since April, the weekly figure has grown substantially but attracted no further official comment.

There is no legal or political requirement for the Government to acknowledge passive VAT windfalls from commodity price rises. VAT is simply applied automatically to whatever the pump price is. The Exchequer collects more when prices are high and less when they fall, without any active decision or announcement.

Could the Government cut VAT on fuel?

In theory yes, though it is complicated. The UK applies a standard 20% VAT rate to fuel. A temporary VAT reduction on fuel would require primary legislation and would cost the Treasury the very revenue it is currently receiving. At current volumes, reducing VAT on fuel from 20% to 5% would cost approximately £3.5 billion per year in lost receipts.

The previous government discussed a temporary VAT cut during the 2022 price spike but rejected it, partly because it would disproportionately benefit higher-mileage drivers and commercial operators, and partly because a temporary measure would need to be reversed, creating a second price shock. The current Government has made no public commitment on this.

What the total tax take looks like at current prices

At 170.54p per litre of petrol, the total tax per litre — duty plus VAT — is approximately 81.35p. That is 47.7% of the pump price. At 192.86p diesel, total tax is approximately 84.9p per litre, or 44.0% of the price.

See our full VAT and fuel tax breakdown for the complete picture of how the tax percentage changes as prices rise, and why you pay a lower percentage but more cash in absolute terms as fuel gets more expensive.

Track fuel prices in real time

Our live fuel price map shows current petrol and diesel prices at every station near you, updated every hour from Government Fuel Finder data. Our price trends chart shows the full 2026 price journey from the pre-conflict baseline through the spike and the current four-year highs. Use our fuel cost calculator to see exactly what the current prices are costing you annually.