What Is Fuel Duty?
Fuel duty is a tax charged by the UK Government on petrol and diesel. It is applied at a fixed rate per litre before VAT is added.
At present, fuel duty stands at 52.95p per litre, after a temporary 5p cut introduced in 2022.
On top of fuel duty, drivers also pay 20% VAT — which is charged on the total price, including duty. That means tax makes up a significant portion of what you pay at the pump.
How Much of Pump Prices Is Tax?
When petrol costs around 145p per litre, roughly:
- 52.95p is fuel duty
- Around 24p is VAT
- The rest covers wholesale fuel costs, distribution, retail margins and operating costs
In many cases, around 55–60% of the pump price is tax. This is why even small changes to duty can have a noticeable impact.
What Happens If Fuel Duty Rises?
Let's look at the practical impact:
Impact on a typical 55-litre tank:
- 1p per litre increase → about 55p more per fill-up
- 5p per litre increase → about £2.75 more per fill-up
Because VAT is applied on top, the real increase would be slightly higher than the headline duty rise.
For drivers filling up weekly, even small increases add up over the year.
Why Has Fuel Duty Been Frozen?
Fuel duty has been frozen or cut repeatedly since 2011. Governments have argued that rising wholesale oil prices and cost-of-living pressures justify keeping duty steady. However, freezes also reduce government revenue over time.
There is ongoing debate about whether long-term freezes are sustainable — particularly as electric vehicle adoption grows and fuel tax income declines.
Would a Duty Rise Explain High Fuel Prices?
Not entirely. While fuel duty is a large component of pump prices, day-to-day fluctuations are driven mainly by:
- Wholesale oil and refined fuel prices
- Exchange rates
- Retail competition
- Regional pricing differences
This is why prices can vary significantly between nearby stations — even when duty remains unchanged. In other words, tax policy matters — but competition and transparency matter just as much.
Why Comparing Fuel Prices Still Matters
Even without a duty rise, drivers can see differences of:
- 5p to 15p per litre between stations
- Sometimes more between motorway sites and supermarkets
On a full tank, that can mean saving £5–£10 simply by choosing a different station. Regardless of what happens with fuel duty in 2026, the biggest savings often come from comparing local prices — not waiting for tax changes.
What Should Drivers Expect in 2026?
At the time of writing, no confirmed fuel duty increase has been announced. However, as public finances tighten and long-term road funding models evolve, fuel taxation will likely remain a live political issue.
For now:
- The current 5p cut remains in place
- Pump prices are still heavily influenced by wholesale markets
- Local competition continues to be the main factor affecting what you pay
If fuel duty policy changes, it will affect every driver in the UK — but how much it changes your weekly fuel bill depends just as much on where you choose to fill up.
The Bottom Line
Fuel duty makes up more than half of the pump price — so any increase would be noticeable. But the difference between nearby petrol stations often has a bigger impact on your annual fuel costs than a small tax change.
Staying informed — and comparing prices before you fill up — remains the most reliable way to keep fuel costs down in 2026.
Find Cheaper Fuel Near You
Use our free fuel price comparison tool to find the cheapest fuel near you and track how prices are changing in your area.