The four ways to sell a used car in the UK
There are four realistic ways to sell a used car in the UK: privately, as a part-exchange against your next car, to an instant-buy or online car-buying service, or through an auction. Every one is a trade between money and hassle. Sell privately and you'll usually get the most, but you do all the work. Hand the keys to a dealer or a buying service and you're paid quickly with almost no effort, and you accept less for it.
That's the whole decision. The rest of this guide covers what each route involves, the paperwork DVLA requires either way, and — the bit most selling guides skip — what the law says you're obliged to tell a buyer.
| Route | Speed | What you typically get | Effort |
|---|---|---|---|
| Private sale | Slowest — advertise, field messages, host viewings | The most, usually: around 4% above part-exchange on the one figure with a published methodology (below) | Highest |
| Part-exchange | Same day as buying your next car | The baseline in that comparison | Lowest |
| Instant-buy service | Fast — valuation online, then collection or a branch visit | Generally less than a private sale, but no independent UK study has quantified the gap | Very low |
| Auction | Tied to the sale date, then payment after | Variable, and closer to trade money once entry and commission fees come off | Low to medium |
One caveat: only the price column has real data behind it, and less of it than the confident percentages elsewhere online suggest.
Selling privately
A private sale means advertising the car, dealing with buyers, and handling the money and paperwork yourself. It reliably pays best, and it costs you evenings.
The work splits into three parts. Preparation: clean it properly, gather the service history and receipts, sort the small stuff that makes a car look neglected (a blown bulb, a warning light, a missing locking wheel-nut key), and photograph it honestly in daylight — flaws included, which saves a wasted viewing later. The advert: real mileage, real service history, real faults. The sale: viewings, test drive, negotiation, payment.
Two things catch private sellers out more than anything else. The first is the test drive. Anyone driving your car must be insured to drive it. Some policies include driving-other-cars cover, many no longer do, and it's legally the driver's responsibility — but it's your car. Ask to see their certificate or insurer app first, and go with them. The stakes are set out plainly on gov.uk: police can issue a fixed penalty of £300 and six penalty points for driving a vehicle you're not insured to drive, and a court can impose an unlimited fine and disqualification.
The second is payment. Take the money before the car leaves, in a form you can verify has landed — a bank transfer you can see cleared, not a screenshot of one, and not a cheque or banker's draft that can be reversed after the car's gone.
A full step-by-step guide to selling privately — pricing, the advert, viewings and completing safely.
Part-exchange vs private sale: which gets you more?
Part-exchange is the path of least resistance. The dealer takes your old car against the price of the new one, the paperwork is done in the showroom, and you drive away the same day. You pay for that in the valuation.
How much? This is where nearly every guide online quotes a percentage without saying where it came from. There's essentially one analysis with a disclosed methodology behind it.
Auto Express took a random sample of 1,000 registrations from Carwow's listings and asked market data specialist UKVD for its part-exchange and private-sale estimates on each. The average gap came out at £407 in the private sale's favour, about 4%. Carwow's own guide, updated April 2026, quotes the same UKVD source at "around £400 more". Two caveats: both outlets cite the same underlying data, so that's one source quoted twice rather than two studies, and the Auto Express analysis dates from September 2024 — read it as the right order of magnitude, not today's number.
The more useful finding is that the gap isn't flat. Nearly-new cars on 5,000–10,000 miles showed less than a 2% benefit from selling privately; it peaked at close to 6% around 50,000 miles, then settled back to roughly 4% above that. In some cases part-exchange edged it, typically on high-demand versions of mainstream models a dealer can turn around quickly. So it depends on your car: on a low-mileage, in-demand motor part-exchange may cost you little; on a mid-life family car it's the most expensive convenience on this page. Our guide to depreciation covers what's driving the value you're negotiating over, and there's a dedicated comparison of the two routes.
Instant-buy and online car-buying services
WeBuyAnyCar, Motorway and the rest all sell the same thing: certainty. A valuation online, an inspection, and if the figure holds you're paid quickly without ever meeting a buyer. For a car you need gone this week, that's worth real money.
The honest position on price is this: no independent UK study has ever quantified how these services compare with a private sale. Not "the gap is small", not "the gap is large" — the comparison hasn't been published by anyone without a commercial interest in the answer. Any site quoting you a firm percentage is either guessing or repeating a company's own marketing.
The companies do publish figures. Motorway's site states sellers get "£1,600 more than part exchange, on average", referencing a customer survey it ran in April 2026, and that 84% of sellers beat market price, described as validated against two independent sources it doesn't name. That's Motorway's claim about Motorway, from Motorway's own survey. It may well be accurate; it isn't independent evidence, and we won't present it as though it were.
You can test it for your own car in an afternoon, which beats any average: quotes from two or three buying services, a part-exchange figure from a dealer, and a look at what comparable cars are advertised for privately. Four real numbers for your car instead of one average for somebody else's.
Two things to watch. The online valuation is provisional, confirmed or revised after a physical inspection — a downward revision at collection is the most common complaint about this route. And some services charge an admin fee that comes off the headline figure, so ask what lands in your account, not what the quote says.
Check your own car before you advertise it
Most people think of a car history check as something a buyer runs. It's at least as useful the other way round: a serious buyer will run one on your car, and you want to know what it says before they do, not while they're standing on your driveway with it open on their phone. Three things routinely surface on a seller's own car and derail the sale.
Outstanding finance. If the car is on hire purchase or conditional sale, you don't own it yet. Citizens Advice puts it plainly: the goods don't belong to you until the final instalment is paid, and "while you are still making payments, you aren't allowed to sell or dispose of the goods without the lender's permission. If you do, you'll be committing a criminal offence." Get a settlement figure and clear it, or agree the process with the lender, before you advertise. Our guide to outstanding finance covers how buyers find it.
An old write-off marker. A car can carry a Cat S or Cat N marker from before you owned it, recorded by an insurer after a repair you knew nothing about. Plenty of repaired cars sell perfectly well — but a buyer finding it themselves after you've said nothing looks like concealment, and as the next chapter explains, a description that doesn't match the car is a legal problem, not just an awkward one. Write-off categories explained covers each one.
A mileage discrepancy. Recorded mileages that don't run in order — usually a keying error at an MOT years ago, occasionally something worse — will show on a buyer's check and cast doubt on everything else you've said. Better to find it and be ready to explain it: see how mileage discrepancies show up.
Running a comprehensive check on your own registration before you list does two jobs: it tells you what a buyer's check will say, and a clean report is something you can show a viewer to shorten the conversation. The sample report shows what one covers. A check is point-in-time — it reflects what's recorded at the moment you run it and doesn't change afterwards, so run a fresh one if there's a long gap before the sale.
The paperwork you need to sell a car
The legal minimum is smaller than most people expect, but the one step you cannot skip is telling DVLA.
Give the buyer the green 'new keeper' slip. gov.uk's seller guidance is explicit: "give the green 'new keeper' slip from the log book to the buyer" and "tell DVLA you've sold the vehicle and give them the full name and address of the buyer". The buyer uses that slip to tax the car and register it; their own V5C (the log book itself) follows from DVLA.
Tell DVLA online, straight away. The service at gov.uk/sold-bought-vehicle is open Monday to Friday, 7am to 9pm, and Saturday and Sunday, 7am to 8pm. You can't use it if you've already posted the log book. Regulation 22 of the Road Vehicles (Registration and Licensing) Regulations 2002 requires the registered keeper to notify DVLA "forthwith" with the new keeper's name and address and the date of sale. "Forthwith" is the legal standard, not "when you get round to it".
What happens if you don't is more nuanced than the flat "£1,000 fine" you'll read elsewhere. DVLA's enforcement policy says failure to notify a change of keeper draws an out-of-court settlement letter first, "set at £55 reduced to £35 if paid in 17 days"; only if that goes unpaid can it reach the magistrates' court, where "the maximum penalty is £1,000". So £1,000 is the court ceiling, not the standard penalty. The bigger practical risk: until DVLA has the change of keeper you're still the registered keeper on record, so speeding tickets, tax penalties and clean-air-zone charges come to you.
Your tax refund is automatic. Once DVLA has the notification the tax is cancelled and you "automatically get a refund cheque for any full months left", calculated from the date DVLA receives the information — which is why you tell them the same day, not the same month. Allow up to eight weeks; a Direct Debit is cancelled automatically. Tax doesn't transfer to the buyer, who must tax it in their own name before driving it.
Beyond that: hand over the service history, receipts and both sets of keys; write a receipt with the date, price, registration, VIN and both parties' names and addresses, signed by both, and keep a copy; and tell your insurer. That last one isn't a DVLA requirement and we found no primary UK source making it a legal obligation — but it's standard practice, since your policy is written against a car you no longer have.
You don't legally need a valid MOT to sell a car. You do need one to drive it: gov.uk states "you cannot drive or park your vehicle on the road if the MOT has run out", and that you "can be fined up to £1,000" for doing so — the only exceptions being a pre-arranged test or somewhere it's being repaired. A car with a fresh MOT sells faster anyway, and a buyer can confirm its MOT and tax status in seconds with our free car check. Our full guide to selling paperwork.
What you're legally required to tell a buyer
Almost every selling guide says "be honest" and leaves it there. Here's what the law actually says, because a private seller's obligations are different from a dealer's.
The Consumer Rights Act 2015 does not apply to you. It governs contracts between a "trader" and a "consumer", and section 2 defines a trader as someone "acting for purposes relating to that person's trade, business, craft or profession". Selling your own car isn't that — so the protections a buyer gets from a dealer, like the 30-day right to reject, don't exist in a private sale.
"Satisfactory quality" doesn't apply either. Section 14 of the Sale of Goods Act 1979 opens by stating there is "no implied term about the quality or fitness for any particular purpose of goods supplied under a contract of sale", then makes one exception: "where the seller sells goods in the course of a business, there is an implied term that the goods supplied under the contract are of satisfactory quality." In the course of a business. Not you. A private buyer takes on the risk of a fault developing later.
But the description must match the car. Section 13 of the same Act is not limited to business sellers: "where there is a contract for the sale of goods by description, there is an implied term that the goods will correspond with the description." Advertise "full service history" when there are gaps, "never been in an accident" on a car carrying a write-off marker, or a mileage it hasn't done, and the goods don't correspond with the description.
And you must not actively mislead. Under section 2(1) of the Misrepresentation Act 1967, a buyer who enters a contract after a misrepresentation and suffers loss can claim damages even where it wasn't fraudulent — unless the seller "proves that he had reasonable ground to believe and did believe up to the time the contract was made the facts represented were true." Note where that burden sits: on you. "I didn't know" only helps if you had reasonable grounds for what you said.
One myth deserves killing: "sold as seen" is not a magic phrase that removes your obligations. Section 6 of the Unfair Contract Terms Act 1977 says liability for breach of sections 13 to 15 of the Sale of Goods Act "cannot be excluded or restricted by reference to a contract term except in so far as the term satisfies the requirement of reasonableness", and subsection (4) makes clear that isn't limited to business sellers. Whether a given wording is reasonable is for a court to decide on the facts — so it's not the automatic shield it's assumed to be.
None of this is legal advice, and a real dispute turns on its own facts; Citizens Advice is the right first stop. The practical takeaway is simpler than the statutes: write an advert you could defend line by line, disclose what a check would reveal anyway, and keep the advert and the receipt.
FAQs
What's the best way to sell a car in the UK — privately, part-exchange or an instant-buy service?
Privately, if you want the most money and can spare the time. Part-exchange, if convenience matters more than a few hundred pounds. An instant-buy service, if you need the car gone quickly without meeting anyone.
Do I have to tell DVLA when I sell my car?
Yes. Regulation 22 of the Road Vehicles (Registration and Licensing) Regulations 2002 requires the registered keeper to notify DVLA "forthwith" with the buyer's name and address and the date of sale. Do it online (7am–9pm weekdays, 7am–8pm weekends). DVLA's enforcement policy sets an out-of-court settlement of £55, reduced to £35 if paid within 17 days, rising to a maximum £1,000 at the magistrates' court.
Am I legally required to disclose known faults when selling my car privately?
You aren't obliged to volunteer every fault, but everything you state must be true. Section 13 of the Sale of Goods Act 1979 requires goods to match their description and applies to private sellers; section 2(1) of the Misrepresentation Act 1967 makes you liable for an untrue statement unless you can prove you had reasonable grounds to believe it. Section 14's "satisfactory quality" obligation applies only to sellers acting in the course of a business, so not to you.
Is it worth getting my car checked before I sell it?
It's worth knowing what a buyer's check will show before they run one. Outstanding finance, a write-off marker predating your ownership and a mileage discrepancy are all things sellers routinely don't know their car carries, and all three are easier to handle before a buyer finds them.
How much more can I get selling privately compared to part-exchange?
Around 4% on average — £407 across 1,000 sampled registrations (Auto Express/UKVD, September 2024) — but it varies with mileage, from under 2% on a nearly-new car to close to 6% around 50,000 miles.
Is WeBuyAnyCar or Motorway worth it compared to selling privately?
That depends what your time and certainty are worth, because nobody has published an independent comparison. Motorway states its sellers get "£1,600 more than part exchange, on average", from its own April 2026 customer survey — the company's claim about itself, not independent data. Get quotes from two or three services, a part-exchange figure and a look at private asking prices, then decide on real numbers.