The V5C logbook number is the 11-digit document reference number printed on the V5C registration certificate. It is labelled 'Document reference number' and sits on the main page of the document, not on the tear-off green new keeper slip. If you are holding the V5C, look for that label and an 11-digit number beside it.
The exact layout has changed over the years, so the number may be in a different spot on an older V5C than on a newer one. Go by the label rather than the position on the page.
Which number do people mean by 'logbook number'?
'Logbook' is the everyday name for the V5C, and a few different numbers appear on it. That is where most of the confusion comes from:
- Document reference number: the 11-digit number that identifies that particular paper document. This is what most people mean, and it is what DVLA services usually ask for.
- Registration number: the number plate, such as AB12 CDE.
- VIN or chassis number: the vehicle's unique identifier, which is a different thing entirely.
- Other reference numbers: the new keeper slip and any DVLA letters can carry their own references, so do not assume they match.
If a form asks for the 'V5C reference' or 'logbook number', it almost always wants the 11-digit document reference number.
Step by step: finding it on your V5C
- Pick up the main V5C document, which is the one with the vehicle and keeper details.
- Look for the heading 'Document reference number' and read the 11 digits beside it.
- Check it against any form or website you are filling in, and watch for transposed digits.
- If you are buying, do not rely on a photo or screenshot alone. Ask to see the original document.
What the document reference number is used for
You may need it to:
- Update your address or other keeper details with DVLA online.
- Tax the vehicle in some situations, although the reminder letter reference is often an alternative.
- Tell DVLA you have sold or bought a vehicle, depending on the service you use.
- Confirm that the V5C you are looking at belongs to the vehicle in question.
Check GOV.UK for the current requirements, as DVLA services and their input requirements can change.
What if you can't find your V5C?
If the V5C is lost, stolen or destroyed, you can apply to DVLA for a replacement. There is normally a fee, so check GOV.UK for the current price and the correct application route. The vehicle must be registered in your name as the keeper. A replacement will carry a new document reference number, so the old number is no longer the one to use.
If you have only just bought the vehicle and received the green new keeper slip, your full V5C should arrive from DVLA by post. If it has not turned up after a reasonable time, contact DVLA through GOV.UK rather than a third party.
If you're buying a used car: V5C red flags
The V5C proves who the registered keeper is. It does not prove who owns the car, and it does not prove the car is free of problems. Before you hand over any money, check these:
- Keeper details: the name and address should match the seller, and the seller should be able to show ID.
- Registration, VIN and engine number: these should match the vehicle itself. Check the VIN on the car against the paperwork.
- Number of previous keepers: it should be consistent with what the seller tells you.
- Signs of tampering: look for alterations, smudging or an unusual paper feel. Be wary if the seller cannot produce the document at all.
- Recently issued V5C: a very recent replacement is not necessarily a problem, but ask why it was issued.
A genuine-looking V5C is only one part of the picture. A history check can show things the paperwork will not, such as MOT history and mileage records that may reveal clocking, insurance write-off categories (Cat A, B, S or N on the MIAFTR database), a police stolen marker (PNC) and outstanding finance. Entering the registration on motorpeek.com is a quick way to look at that background before you commit. Motorpeek is an independent service and is not affiliated with DVLA or the government.
Keep the number safe
Treat the V5C and its reference number as sensitive. Do not post clear photos of the whole document online, and never send it to strangers. When you sell, complete the sale details properly and send the correct section to DVLA, or use the online service where available, so the change of keeper is recorded.
Frequently asked questions
Is the V5C logbook number the same as the document reference number?
In everyday use, yes. People say 'logbook number' to mean the 11-digit document reference number on the V5C. It is different from the registration number and the VIN, so check the label on the form.
How many digits is the V5C document reference number?
It has 11 digits. If the number you have is shorter or longer, you may be looking at a different reference, such as the VIN, a letter reference or part of another document.
What should I do if I've lost my V5C and don't know the number?
Apply to DVLA for a replacement through GOV.UK, which normally involves a fee. You must be the registered keeper. The new V5C will have its own document reference number, so the lost one will no longer be the one to use.