How to Sell a Car on Behalf of Someone Else in the UK

Whether you're helping an elderly parent downsize, assisting a friend who has moved abroad, or navigating the difficult task of handling affairs after a loved one has passed away, you might find yourself needing to sell a car on behalf of someone else. It's a kind gesture, but it comes with a significant hurdle: you can't just take the keys and put a "For Sale" sign in the window. The DVLA has strict rules about who can transfer ownership of a vehicle. Doing it incorrectly can lead to legal complications, invalid insurance, or a fine.

The right route depends almost entirely on one question: is the owner still alive and able to make their own decisions? If they are, this is about getting their clear permission and cooperation. If they have lost the mental capacity to decide for themselves, you need a registered Lasting Power of Attorney. If they have died, you step into the role of executor or administrator and act for their estate. Each path has its own paperwork, and using the wrong one — or skipping a step — is where people get caught out. This guide walks through all three, the documents to gather for each, and the mistakes to avoid.

First, Match Your Situation to the Right Authority

Before you do anything else, work out which legal footing you are on. The table below maps the most common situations to the authority and paperwork you actually need. Getting this right at the start saves you from agreeing a sale you then can't legally complete.

Scenario 1: Selling for a Living Owner Who Can Still Decide (Permission & Authority)

This is the most common case: an elderly parent who no longer drives, a partner working overseas, or a relative recovering from surgery. The owner is perfectly capable of making the decision — they just can't physically handle the listing, the viewings, and the paperwork themselves. Crucially, because they still have mental capacity, you do not need a Power of Attorney. What you need is their clear, ideally written, permission.

Get a Letter of Authority

A short, signed letter of authority protects both of you and reassures buyers. It should name the owner, name you, describe the car (make, model, registration), and state plainly that the owner authorises you to advertise and negotiate the sale on their behalf. Have the owner sign and date it, and keep a copy of their photo ID (passport or driving licence) attached. It costs nothing and takes minutes, but it turns a vague "my mum said I could" into something you can show a cautious buyer.

The Registered Keeper Still Has to Sign the V5C

Here is the part people underestimate: a letter of authority lets you arrange the sale, but it does not let you sign the V5C in the owner's place. Notifying the DVLA of a change of keeper is the registered keeper's legal act. So you still need the owner's cooperation to either sign the relevant section of the V5C, or — far simpler — complete the change of keeper online at gov.uk, which they can do from anywhere in the world in a couple of minutes using the document reference number from the log book. Plan this in before you accept an offer, so you are not left with a buyer ready to pay and no way to transfer ownership.

• Agree the ground rules first: confirm with the owner the minimum price they will accept, who the money goes to, and how the V5C will be signed or transferred — before you advertise.
• Keep the money clean: arrange for payment to go to the owner's bank account, not yours. If it must briefly pass through your account, get that agreement in writing.
• Use the online transfer where possible: a remote owner can notify the DVLA of the sale themselves at gov.uk in minutes, sidestepping posted forms.
• Issue a receipt in the owner's name: the receipt should name the registered keeper as the seller, with you noted as acting on their behalf.

Scenario 2: Selling When the Owner Has Lost Capacity (Power of Attorney)

If the registered keeper is still alive but can no longer manage their own affairs — through advanced dementia, a serious stroke, or another condition that removes their mental capacity to decide — a simple letter of authority is no longer enough, because they cannot validly give one. In this situation you need a Power of Attorney (POA). In England and Wales this is a Lasting Power of Attorney (LPA) for Property and Financial Affairs (registration fee £82 via the Office of the Public Guardian, or up to £120 with solicitor assistance). In Scotland it's a Continuing Power of Attorney. These documents legally grant you authority to manage finances and property, which includes selling vehicles.

Ordinary Permission vs a Power of Attorney — the Key Difference

The distinction trips a lot of people up. If the owner still has capacity, you act on their instructions — they remain the decision-maker and they sign their own paperwork. A Power of Attorney is different: it lets you step into the decision-making role and sign on their behalf, which is precisely why it is only valid once it has been registered with the Office of the Public Guardian (OPG). An LPA that has been signed but never registered cannot be used. And an LPA must be set up while the person still has capacity — you cannot create one after they have lost it. If there is no registered LPA and the person can no longer decide for themselves, you would have to apply to the Court of Protection to become a deputy, which is slower and more involved.

The Process for Selling with Power of Attorney

• Check Your Legal Authority: Ensure the POA document specifically grants you authority over "property and financial affairs," and that it has been registered with the OPG. A Health and Welfare LPA does not allow you to sell a car.
• Gather the Documentation: You will need the V5C log book, the owner's valid ID, your own ID, and the original POA document (or a certified copy).
• Notify the DVLA: You must write to the DVLA to inform them that you are acting under Power of Attorney. Include the POA reference number or a certified copy.
• Complete the V5C: Sign the owner's name on their behalf, followed by your own signature and the notation "(Attorney)."
• Show the LPA to the buyer: a careful buyer may want to see that you genuinely have authority. Having the registered LPA to hand removes their last hesitation and prevents the deal stalling.

Remember that as an attorney you have a legal duty to act in the donor's best interests. That means selling at a fair market price — not undervaluing the car for a quick sale — and paying every penny of the proceeds into the donor's own account. The OPG can ask attorneys to account for their decisions, so keep a clear record of how you priced the car, who you sold it to, and where the money went.

Scenario 3: Selling a Deceased Person's Car (Executors and Administrators)

If you are the Executor (named in the will) or the Administrator (if there is no will), you are legally responsible for handling the estate's assets — and the car is one of them. The single most important principle here is that the car belongs to the estate, not to you. You are selling it for the estate, the proceeds go to the estate, and they are then distributed according to the will or the rules of intestacy.

First Steps After the Death

• Tell the DVLA the keeper has died: you can do this as part of registering the death (the Tell Us Once service, where available) or directly. The DVLA needs to know both about the death and, later, about the sale.
• Sort out insurance immediately: the deceased's motor policy usually ends on death, which means the car may no longer be insured to drive. Do not let anyone drive it on the old policy — driving uninsured is an offence, and an accident would be uninsured. Speak to the insurer before anyone turns a key.
• Keep the car off the road if it is not insured or taxed: if it is parked on a public road it must be taxed and insured, or formally declared off the road with a SORN if kept on private land.
• Locate the V5C and the will: you will need both, plus the death certificate.

Do You Need Probate Before You Can Sell?

Not always. For a small or simple estate, the value of the car alone may not trigger the need for a formal grant — and in practice many used-car dealers will buy a car from an executor before probate is granted. But for a larger or more complex estate, or where a cautious private buyer asks for proof of your authority, you may need to wait for the Grant of Probate (where there is a will) or Letters of Administration (where there isn't). These grants of representation typically take in the region of 4–8 weeks once applied for, sometimes longer. If a buyer or a bank asks to see the grant, it is because they want certainty that you are entitled to sell — having it ready avoids the deal falling through.

Selling the Car as Executor

• Completing the V5C: In the signature section, do not sign the deceased's name. Instead, write "Executors of the estate of [Full Name of the Deceased]" and sign your own name next to it. Send the green "New Keeper" slip to the DVLA. Give the rest of the V5C to the buyer.
• Obtain Probate: If the estate is large or complex, you may need to wait for the Grant of Probate before selling significant assets like a car. However, many dealers will buy a car directly from an executor before probate is granted.
• Pay the money into the estate: proceeds go into the estate account, never your personal one. The receipt should name the estate as the seller.

Transferring the Car to a Beneficiary

If a car is left to a specific person in the will, fill out the V5C as above (as executor) to show the transfer to the beneficiary as the "new keeper." The beneficiary will then receive a new V5C in their name. The same applies if the family simply wants to keep the car: rather than selling, you transfer keepership from the estate to the relevant family member, who then arranges their own tax and insurance before driving it.

A Note on Insurance for a Deceased Estate

Because the deceased's policy normally lapses, the car effectively becomes uninsured the moment they die. If it needs to be moved — to a viewing, a dealer, or simply off a public road — you must arrange cover first. Some insurers offer short-term or "executor" cover for exactly this purpose, and some classic-car or specialist policies have provisions for estates. Whatever you do, never assume the old policy still protects a driver after the keeper has died.

What If There Is No Will or Power of Attorney?

Without a POA (for a living person who lacks capacity) or a grant of representation (for someone who has died), you cannot legally sell the vehicle. For a deceased person with no will, you will need to apply to the Probate Registry for Letters of Administration to become the estate's administrator, following the rules of intestacy that decide who inherits. For a living person who has lost capacity with no registered LPA, the route is an application to the Court of Protection to be appointed a deputy. Both take time, so be patient — and resist any pressure from a keen buyer to "just sort the paperwork later."

Documents to Gather Before You List

Whichever scenario applies to you, pulling the paperwork together first makes everything that follows smoother — and it is exactly the proof a careful buyer will want to see. Tick these off before you advertise.

Common Mistakes When Selling for Someone Else

• Signing the V5C Yourself: Unless you have Power of Attorney, you cannot sign the V5C. For a deceased estate, you sign as an "Executor," not as yourself or the deceased.
• Forgetting the Date of Sale: Always accurately record the date of sale. This is when responsibility for the vehicle shifts to the new owner.
• Insurance Gaps: You cannot insure a car in your name if you don't own it. For a deceased person's car, check with your insurer about "Driver's Insurance" before driving it.
• Not Sending the Slip to the DVLA: It is your responsibility to notify the DVLA. If the buyer doesn't do it, fines and penalties will still come to the estate.
• Letting the money land in your own account: proceeds belong to the owner or the estate. Mixing them with your own funds creates real problems, especially if other beneficiaries or the OPG later ask where the money went.
• Undervaluing the car for speed: as an attorney or executor you have a duty to get a fair price. Take a moment to check market values before accepting the first offer.

How car-spot Makes This Easier

Handling the legal side of a sale is one challenge; marketing the car to get a good price is another. When you're already dealing with the stress of managing someone else's affairs, the last thing you need is a complicated selling process — or a sale you can't account for afterwards. That's where car‑spot comes in. A platform that keeps a clear, documented trail is genuinely invaluable when you are acting for someone else, because you can show exactly how the car was priced, who enquired, and what was agreed.

• Your contact details stay private: your phone number and address are never published on the listing. Enquiries come to you through the platform, which matters when you're handling a vulnerable owner's or an estate's affairs and don't want strangers turning up.
• Buyer accountability: enquirers submit their own details before they can contact you, so you always know who you are dealing with — no anonymous, untraceable messages. That accountability is reassuring when the sale isn't even your own car.
• Secure messaging keeps a record: every conversation is logged in one place. If a beneficiary, a co-executor, or the Office of the Public Guardian ever asks how the sale was handled, you have a complete, timestamped trail rather than a tangle of texts and call notes.
• Accurate Listings in Minutes: When selling a car that isn't yours, you might not know every technical detail. The AI Vehicle Specification Assistant automatically fills in missing specs like engine size, CO2 emissions, and standard features.
• Build Trust with Buyers: Buyers can be wary when the seller isn't the registered keeper. Feature-to-Photo Highlighting lets you link specific features directly to the photo evidence, proving the car's condition.
• Create Professional Listings Fast: The AI Description Generator takes the selected features and creates a compelling, accurate description—ensuring you don't forget key selling points.
• No Pressure, No Fees: With car‑spot, there are no fees, ever. Your listing is free for 30 days. If it hasn't sold, you can extend affordably (30 days at £6.50).

Rules and fees change, and individual circumstances vary — especially around probate thresholds, intestacy, and capacity. For the definitive position always check the official guidance on gov.uk, the Office of the Public Guardian for Power of Attorney questions, and the probate service for estate matters, or take legal advice where a lot of money or a dispute is involved.