The short version: the 5p a litre cut in fuel duty that drivers have had since March 2022 was due to end after 31 December 2026. At the Autumn Budget on 28 October 2026 the Chancellor extended it again, so the main rate stays at 52.95p a litre until the end of June 2027. The planned inflation-linked rise has also been pushed back to 1 July 2027. Nothing changes at the pump on 1 January, and the next date to put in the diary is the start of next July.
That does not make fuel cheap. The Budget document itself records that diesel went over £2 a litre in October 2026, and it puts the extra cost of filling a typical 55-litre car at about £24 for petrol and £32 for diesel compared with before the Middle East conflict that began at the end of February. The duty decision stops the bill getting worse in January; it does nothing about the wholesale price, which is what has moved this year.
What the Budget actually changed
The Treasury's overview of tax legislation and rates spells out the mechanics, and it is worth reading the wording rather than the headlines:
- The temporary 5p per litre cut in the main fuel duty rates now runs to 30 June 2027 instead of ending on 1 January 2027.
- The separate 3.7p cut on rebated fuels such as red diesel for excepted machines is extended to the same date.
- From 1 July 2027 the rates go back to their pre-March 2022 level and then rise in line with RPI.
The Budget 2026 document adds the government's own estimate of what this is worth: about £230 for the average car driver over this Parliament compared with the previous government's plans, £472 for the average light goods vehicle driver and nearly £4,000 for the average HGV. Those are Treasury modelling figures, not a promise of what you will see on a receipt.
Why pump prices moved so much this year
Duty is a fixed amount per litre, so it is not what pushed prices up in 2026. The Budget paper says UK petrol rose 33% and diesel 41% between February and October. The RAC's Fuel Watch explains the usual chain: forecourt prices follow wholesale prices, and wholesale prices depend on crude oil, refinery capacity, the pound against the dollar, delivery costs and retailer margins. On top of that sit the 52.95p duty and 20% VAT, which is charged on the duty as well as the fuel.
For context, the RAC lists the previous diesel record as 199.09p a litre in June 2022. This autumn's diesel prices have gone past that mark, which is why the gap between petrol and diesel has felt so wide on forecourt signs.
What 1 July 2027 could look like
When the cut ends, the duty goes back up by 5p a litre, and the deferred RPI uprating is applied from the same date. With VAT on top, a 5p duty rise works out at 6p a litre at the pump before any inflation increase. On a 55-litre fill that is £3.30 from the duty reversal alone.
Three things could change that picture, and none of them are known yet:
- The Chancellor could extend the cut again. It has been extended several times since 2022, but there is no commitment beyond June 2027.
- Wholesale prices could fall back, which would soften the effect. They could also rise further.
- RPI in the run-up to the change decides how large the inflation step is.
So treat July 2027 as a known step up in tax with an unknown starting point. If you run a diesel van for work or budget tightly for a long commute, it is worth pencilling in a higher fuel line from next summer rather than assuming this year's prices hold.
Making a tank last longer in the meantime
You cannot do much about duty, but you can do something about how much fuel you buy. Most of it is free:
- Check prices before you set off. Every UK filling station now has to publish its prices, and we cover how to read them in our guide to using Fuel Finder. Avoiding motorway services is the single biggest easy saving.
- Tyre pressures. Soft tyres raise rolling resistance. Cold weather drops pressures, so a car set up in early autumn is probably under-inflated by now.
- Weight and drag. Roof boxes and bike racks left on through winter cost fuel at motorway speeds. Take them off when they are not in use.
- Short cold trips. An engine is least efficient in the first few miles. Combining errands into one run, once the engine is warm, uses less than three separate cold starts.
- Smooth driving. Looking further ahead, lifting off early for lights and holding a steady speed save more than any additive or gadget.
If you are thinking about changing car partly to escape fuel costs, our guide to switching from petrol to an EV covers the practical differences, and the used-car buying guide is the place to start if you are looking at something smaller and cheaper to run rather than a new car.
Other motoring lines in the same Budget
A few related measures sit alongside the fuel duty decision. The VED holiday for most HGVs runs to 1 July 2027. Car, van and motorcycle VED rates rise with RPI from 1 April 2027. The 55p tax-free mileage rate for business journeys in your own car becomes permanent, with the rate above 10,000 miles going up to 35p from April 2027. And the pay-per-mile charge for electric and plug-in hybrid cars, known as eVED, is still due to start in April 2028. We cover car tax and eVED in separate articles because they affect different drivers.
Dates to remember1 January 2027: no change at the pump from duty. 1 April 2027: VED rises with RPI. 1 July 2027: the 5p cut ends and the RPI uprating is applied, unless a future fiscal event changes it.
A note on reading the forecourt sign
Duty changes are applied at the refinery or terminal when fuel leaves bond, so the price on a forecourt sign reflects what the retailer paid for the fuel in its tanks. When duty rises, prices tend to move within days; when wholesale costs fall, drivers often feel the drop more slowly. Watching published prices across a few nearby stations is the most reliable way to see whether your local forecourt is passing on changes fairly.
For anything that affects a business budget, such as fuel cards or fleet costs, the Budget documents linked above are the primary source, and an accountant can tell you how the changes apply to your own figures.