Declaring a Cat N write-off when you sell: what the law expects of you

01

Does the law treat dealers and private sellers differently?

Yes. Consumer protection law is aimed at traders, so a dealer has more to disclose than someone selling their own car. A private seller's duties are narrower and come down to describing the car truthfully and not misleading the buyer.

Both share one rule: the car must match the description they give. Beyond that, a dealer must not leave out information a buyer needs in order to decide, and a past write-off is exactly that kind of information. The diagram sets the two side by side.

02

What must a car dealer disclose about a Cat N car?

The short answer to whether car dealers have to declare Cat N is yes, in practice. The rules that catch a dealer who stays silent are in Part 4 of the 2024 Digital Markets, Competition and Consumers Act, which covers the whole of the UK. It came into force on 6 April 2025, replacing most of the 2008 regulations on unfair trading, and it bans unfair commercial practices by traders. Two of its tests catch a dealer who keeps a write-off quiet:

• A misleading action (section 226): telling a buyer something false or misleading about the car, or presenting it in a way likely to deceive. Calling a repaired Cat N car "never written off" would be one.
• A misleading omission (section 227): omitting something a typical buyer would need to know to make an informed choice, which the Act calls material information. Information that is unclear, or arrives too late, is treated by the Act as not given at all.

Trading Standards make the point directly. Among the examples of misleading omissions in their Business Companion guidance, written for businesses in England, Scotland and Wales, is not telling a buyer that a car was once an insurance write-off. The same guidance rules out using labels like "sold as seen" or "trade sale" to cut down a consumer's rights.

Contract law points the same way. Under the Consumer Rights Act 2015, a car supplied by description must match it, and what a trader says about its main characteristics is treated as a term of the contract. A dealer who first mentions the category at the handover risks it counting as too late, so the advert is the place for it.

03

What does a private seller have to say about Cat N?

Less than a dealer. Ask whether private sellers have to declare Cat N and the honest answer is that the duty is not to mislead, rather than a duty to volunteer. The unfair trading rules apply to traders, and the promise that goods are of satisfactory quality, in section 14 of the Sale of Goods Act 1979, binds only someone selling in the course of a business.

What a private seller cannot do is misdescribe the car or mislead the buyer. Section 13 of the same Act requires goods sold by description to correspond with that description. A buyer persuaded by an untrue statement may also have a claim for misrepresentation: in England and Wales under the Misrepresentation Act 1967, and in Northern Ireland under its own Act of the same year. The 1967 Act does not extend to Scotland, where different rules apply.

The danger lies in what you say and write. These are the statements that most often go wrong with a repaired write-off:

Someone who buys and sells cars to make money can count as a trader in law, whatever the advert claims, and Trading Standards list a trader posing as a private seller among the practices banned outright. Where the line falls is explained in our guide to buying from a private seller or a dealer.

04

Does the logbook or the DVLA tell the buyer about Cat N?

Not reliably. The keeper's duty to the DVLA arises at the time of the write-off: reporting it is one of the steps GOV.UK lists, and it says the keeper can be fined £1,000 for failing to.

What happens to the logbook then depends on the category. Keep a Cat S car and the full V5C goes to the insurer while you apply on form V62 for a free duplicate, in which the DVLA records the category. Someone keeping a Cat N car may simply hold on to the logbook they have, so a Cat N car's V5C can say nothing about the write-off.

When the car is sold later, there is nothing extra to report about the write-off. You notify the sale as you would for any car, with the buyer's name and address, and GOV.UK's instructions for doing so do not mention write-offs. Nothing in that process reaches the buyer, so telling them is down to you.

05

How should you word a Cat N declaration?

1. Lead the advert with the category and the year, such as "Cat N, [year]". If the listing form asks about write-offs, answer it.
2. Describe the damage in a sentence, say how it was put right, and offer the repair invoices and photos.
3. Reply to questions by message where you can, tell every buyer the same thing, and save the thread.
4. On the receipt, write something like: "The buyer has been told this car is a repaired Category N insurance write-off ([year])." Each of you signs both copies and keeps one. The car sale receipt template covers the rest of what a receipt should say.
5. Screenshot the advert before taking it down.

Not sure what the record says? Check before you write the advert, so that your description is right. Our category car check shows any write-off category on record, with the date of the loss where the record has it, as part of the Premium report (£7.99).

Whichever kind of seller you are, a written declaration in the advert and on the receipt is your best protection. This is general information, not legal advice.

06

Why does declaring Cat N up front help you sell?

The category shows up on any write-off check a buyer runs, so silence does not hide it. Discovered after a long drive to a viewing, it makes the buyer doubt everything else in the advert, and most will leave.

Mentioned at the start, it filters out buyers who would never accept it, so the people who come to look have already priced it in. The written declaration is also your evidence if anyone later claims they were misled.

Expect a lower price than for a clean car. The guide to how much Cat N lowers a car's value helps you set a fair one.

07

What if the Cat N record comes as news to you?

Plenty of owners only find out when they come to sell. You cannot describe something you never knew about, but once you do know, you must not deny it or play it down to a buyer.

The law in England and Wales puts the burden on the seller. Under section 2 of the Misrepresentation Act 1967, a seller whose untrue statement causes the buyer a loss is liable for it, unless the seller can show they had reasonable grounds for believing the statement and did believe it until the contract was made. Checking the record before you advertise is the simplest way to stay on the right side of that.

And if the write-off was hidden from you when you bought the car, Citizens Advice can tell you what options you have against your own seller.

08

Buying a Cat N car: can you count on the seller to mention it?

No. Some sellers will stay silent whatever the law says, and others honestly do not know. Check the registration yourself before any money changes hands.

If the record turns up after you have bought the car and nobody mentioned it, gather the advert, your messages and the receipt. Bought from a dealer? Contact them in writing first: Citizens Advice says a car that does not match the advert or the description you were given may entitle you to a repair, the cost of one, or some or all of your money back.

Bought privately? Then the questions are whether the description was wrong and whether anything you were told was false. For your own case, contact Citizens Advice.