Chassis number vs VIN — what's the difference?

For every car built after 1981 the chassis number and the VIN are the same 17 characters. Older cars (and some low-volume kit cars) may have a separate chassis number — a shorter identifier stamped on the frame — that does not follow the VIN standard.

When it matters

UK insurers, DVLA and importers all use the VIN. If you're insuring a modern car, always quote the VIN from the V5C or windscreen plate — a shorter chassis number from an old registration document will be rejected.

Classic and imported vehicles

Pre-1981 vehicles may only carry a manufacturer chassis number. For imports, ensure the DVLA-issued VIN plate is affixed before selling the vehicle in the UK.