What do I put in V55/5 box 31 type of fuel?
Reviewed 2026-07-10
Short answer
Put the fuel type, such as Petrol, Diesel or Electricity, matching the vehicle and approval evidence.
Official position
The V355/5 guidance says box 31 is type of fuel and gives examples including Petrol, Diesel and Electricity. Fuel type also affects tax treatment, so it should be consistent with tax class and emissions evidence.
What to do
Take the fuel type from the CoC, IVA/MSVA certificate, foreign registration document or vehicle evidence.
Make sure box 31 agrees with box 2 tax class and the payment amount.
For hybrids, EVs, LPG or conversions, use the evidence-backed fuel description and keep conversion evidence.
Do not confuse fuel type with tax class wording.
Common mistakes
- Putting petrol car or diesel car in the fuel box instead of just fuel type.
- Using the wrong fuel type after an engine or fuel conversion.
- Leaving fuel inconsistent with emissions and tax-class fields.
Related help
Official sources
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