Car tax and petrol vs diesel UK 2026: the difference in road tax between petrol and diesel cars. First-year rates, standard rates and the diesel supplement that applies to certain vehicles.
Understanding Petrol vs Diesel Tax UK 2026
Vehicle Excise Duty (VED) rules in the UK cover a wide range of vehicle types and uses. Understanding how road tax applies to your specific situation is essential for staying compliant with DVLA requirements and avoiding fines.
VED Rates and Classifications
UK road tax is calculated based on vehicle type, CO2 emissions and usage. The following table summarises key rates for petrol vs diesel tax uk 2026:
| Vehicle Type | VED Class | Notes | Annual Cost |
|---|---|---|---|
| Petrol Band D | First year | No supplement | £185 |
| Diesel Band D | First year | Plus £30 | £215 |
| Petrol Band D | Standard year 2 plus | Same rate | £165 |
How Road Tax Works for This Vehicle Type
Diesel cars pay more road tax in the first year than equivalent petrol cars due to the diesel vehicle excise duty supplement of £30. This supplement applies to most diesel cars registered after 2018 that do not meet Real Driving Emissions Step 2 (RDE2) standards. From year two onwards, both fuel types are taxed identically based purely on CO2 emissions.
Key Takeaways
- Diesel Supplement Year 1: Diesel cars pay £30 extra in the first year of road tax
- Year 2 Parity: From year two, petrol and diesel cars pay the same standard VED rate
Note: Diesel cars that meet RDE2 emission standards do not pay the diesel supplement. Many newer diesel vehicles from 2020 onwards meet RDE2, so check your V5C for the emissions standard before assuming the supplement applies.
For more information about UK vehicle tax and to calculate your specific road tax obligations, use our free car tax calculator covering all UK vehicle types and emissions bands.