When you fill up at 142.9p per litre, you might assume most of that goes to the fuel company. In reality, over half goes straight to the government. Understanding where your money actually goes explains why UK fuel costs what it does — and why comparing prices between stations matters more than you might think.
Every litre of fuel you buy has four main cost components: fuel duty, VAT, the wholesale cost of the fuel itself, and the retailer's margin. Let's break down exactly how these stack up.
The Price Breakdown
Based on an average pump price of 142.9p per litre for unleaded petrol in February 2026, here's where your money goes:
That means on a typical 50-litre fill-up costing £71.45, approximately £38.48 goes to the government in duty and VAT. The actual fuel — the refined petroleum product — costs around £28, and the retailer keeps roughly £5.
Fuel Duty: The Fixed Tax
Fuel duty is a flat tax added to every litre of petrol and diesel sold in the UK. As of February 2026, the rate is 52.95p per litre. This is a fixed amount, not a percentage — so it doesn't change whether oil prices are high or low.
The duty was frozen at 57.95p per litre from 2011 to 2022, then cut by 5p to 52.95p in March 2022 to help with cost-of-living pressures. This temporary cut has been extended several times and remains in place. Without it, you'd be paying an extra 5p per litre on every fill-up.
The Fuel Duty Freeze
Fuel duty has effectively been frozen for over 14 years. In real terms (accounting for inflation), it has actually fallen significantly. Had it risen with inflation since 2010, duty would now be around 75p per litre. Whether you see this as a giveaway to motorists or a barrier to decarbonisation depends on your perspective.
VAT: The Tax on Taxes
After fuel duty is added, VAT is charged at the standard 20% rate on the total — including the duty. This means you're effectively paying tax on tax. On that 52.95p of duty, you pay an additional 10.59p in VAT. It's a quirk of the system that particularly irritates motorists.
VAT varies with the price — when wholesale costs rise, so does the VAT take. This creates a perverse incentive: the government actually collects more tax revenue when fuel is expensive.
Why Does the UK Tax Fuel So Heavily?
Fuel duty raises around £25 billion per year for the Treasury — roughly 3% of all tax revenue. It's justified on three main grounds:
- Road maintenance — Vehicle usage causes road wear. Fuel duty is a proxy for road use: the more you drive, the more you pay. (Though much of the revenue goes to general spending, not roads.)
- Environmental costs — Burning fossil fuels produces CO2, air pollution, and associated health costs. Fuel duty is intended to make drivers pay for these externalities.
- Revenue — Frankly, it's a reliable revenue stream. Demand for fuel is relatively inelastic (people need to drive), making it easy to tax without severely reducing consumption.
How Does the UK Compare?
The UK has some of the highest fuel taxes in the world. Here's how we compare to other major economies:
For a detailed comparison of pump prices globally, see our global fuel price comparison.
The Retailer's Margin
This is the part you can actually influence. The retailer's margin — typically 8-12p per litre — is what pays for the forecourt, the staff, and the company's profit. It's the only flexible component in the price.
Supermarkets typically operate on thinner margins (as low as 5-7p per litre) because they use cheap fuel to attract shoppers. Motorway services charge much higher margins (often 15-20p) because they have captive customers with no alternatives. This is why the price difference between the cheapest and most expensive station in your area can be 10-15p per litre — that's almost entirely down to retailer margin.
Why Comparing Prices Matters
On a 50-litre tank, a 10p per litre difference saves you £5. Fill up weekly and that's £260 a year — just by choosing where to stop. Fuel duty and VAT are fixed. Wholesale costs are broadly similar. The only real variable is the retailer's take. Use Fuelwise to find the stations with the smallest margin.
What Happens When Oil Prices Change?
When crude oil prices rise, wholesale fuel costs increase — but duty stays the same. This is why price spikes feel less severe at the pump than they are in the commodity markets. If oil doubles in price, pump prices might rise by 30-40%, not 100%.
Conversely, when oil prices fall, the fixed duty component means pump prices don't fall as sharply. The government's tax take remains stable while oil companies and refiners take the hit on revenue.
The Future of Fuel Tax
As more drivers switch to electric vehicles, fuel duty revenue will decline. The government faces a £25 billion hole to fill. Treasury officials have been working on alternatives, with road pricing (pay-per-mile) being the most discussed option.
For now, petrol and diesel drivers continue to pay the lion's share of motoring taxes. EV drivers pay no fuel duty, reduced VED (vehicle excise duty), and no benefit-in-kind tax on company cars — though some of these advantages are being phased out.
Quick Summary
Fuel Duty: 52.95p per litre (fixed, goes to Treasury)
VAT: 20% of total price (~24p at current prices)
Wholesale Cost: ~56p (fluctuates with oil markets)
Retailer Margin: ~10p (this is where you can save)
Total Government Take: ~54% of every litre
Understanding where your money goes won't reduce how much you pay in tax — that's set by Parliament. But knowing that retailer margins are the variable you can control should motivate you to shop around. Check Fuelwise before your next fill-up and make sure you're not giving away more than you need to.