When someone dies and leaves a car in the estate, most executors do one of two things: they type the registration into We Buy Any Car or a similar instant valuation site, or they have no idea where to start at all.
Neither is a good position for probate. Instant online quotes are not designed to meet HMRC’s requirements, and using one without understanding its limitations can lead to a valuation that is either too high, costing the estate in unnecessary tax, or too low and poorly evidenced, which opens the executor to an HMRC challenge.
This guide covers what HMRC actually expects, why instant quotes fall short, and what a proper probate car valuation looks like in practice.
Car Valuation For Probate: What Does HMRC Actually Require?
HMRC requires what is known as the open market value. Under Section 160 of the Inheritance Tax Act 1984, this is defined as the price the car would reasonably be expected to fetch if sold on the open market on the date of death. Not what a dealer might ask for a comparable model, and not an estimate based on current market conditions. The value must reflect what a realistic buyer would have paid, on that specific date, for that specific vehicle.
The date of death requirement is where many executors come unstuck. Car values shift over months, sometimes significantly, so a figure obtained weeks after the death needs to reflect market conditions at the time, not at the point of valuation.
HMRC’s own IHT400 guidance acknowledges that a professional valuation is not always required for a car. However, the figure used must still represent a genuine open market value, one that could be evidenced and defended if HMRC were to query it.
Cars are listed individually on form IHT407, the schedule used to declare personal property and household goods as part of the estate.
Why The Car Is Often The Most Important Asset To Value Correctly
Cars are frequently the most valuable moveable asset in an estate. A typical family car in reasonable condition can easily be worth £8,000 to £15,000, and many are worth considerably more.
On a taxable estate, inheritance tax runs at 40%. That means a valuation error of £3,000 in either direction translates directly into £1,200 of tax paid incorrectly. Overpay, and that money comes out of the beneficiaries’ inheritance unnecessarily. Underpay, and the estate faces a potential HMRC challenge, with interest and penalties on top of the additional tax owed.
The car is also one of the few estate assets where executors routinely reach for an informal or unverified figure, precisely because it feels straightforward. In practice, it is one of the assets most likely to be misvalued, and one where the financial consequences of getting it wrong are easy to underestimate.
Why Instant Online Valuations Fall Short For Probate
Services such as We Buy Any Car are useful tools for selling a car quickly. For probate, they are the wrong starting point, and it is important to understand why.
Instant online quotes are generated from a registration number, a mileage figure, and little else. They are designed to produce a fast lead, not a defensible open market valuation pinned to a specific date. We Buy Any Car’s own purchase terms confirm that the online figure is provisional, and that a physical inspection will always take place before a final offer is made. The price can change if condition or history differs from the assumptions made online. Motorway is similarly explicit, stating that its initial valuation assumes the vehicle is in perfect condition.
Most cars in an estate are not in perfect condition. They may have incomplete service history, a single key, minor bodywork damage, or simply the kind of wear that accumulates on a car used by an older person over many years.
Each of those factors carries a real cost. We Buy Any Car’s own published guidance states that missing service history alone can reduce a car’s value by at least 15%, and in some cases by as much as 40%. A missing or damaged key can cost £250 to £300 to replace according to RAC guidance, and a buyer will typically deduct at least that amount from any offer. Minor bodywork repairs, scratches and scuffs that might seem cosmetic, commonly run to £150 or more per panel. Alloy wheel refurbishment averages around £80 to £130 per wheel. These are not trivial sums on a car already subject to negotiation.
On a car with an initial online quote of £6,000, a missing service history, one key and a couple of scuffed panels could realistically reduce the true open market value by 25% or more once a buyer has factored in their preparation costs.
The deeper problem for probate is structural. These services generate a figure from a number plate and little else, with no account taken of the car’s actual condition, history, or specification. If an executor uses that figure at face value, and the realistic open market value is 25% lower, on a £6,000 car that is a £1,500 overvaluation. At 40% inheritance tax, the estate would overpay £600 in tax that was never owed, money that should have passed to the beneficiaries.
What Counts As Good Evidence For HMRC?
HMRC’s own internal guidance states that the best evidence of a car’s value is usually an actual sale shortly after the date of death, particularly if sold at auction. The gross sale proceeds, meaning the hammer price before any fees are deducted, is what HMRC considers the relevant figure in that scenario.
In practice, most estates will not sell the car before probate is granted. That means executors need the next best thing: a well-documented valuation that can be evidenced and defended.
AutoTrader and similar marketplaces are a reasonable starting point for comparables, but asking prices are not the same as achieved prices. AutoTrader’s own research found that 70% of buyers would expect a discount of at least 6% if a used car appeared in average condition, and only 9% would pay the full asking price for a car that was not properly presented. Consumer negotiation guides commonly suggest that buyers routinely open at 10 to 15% below the listed price.
A car sitting in an estate driveway, unloved and possibly unwashed for months, is not the same as a dealer-prepared example with a fresh MOT and a valet. Using an asking price without adjusting for condition, mileage, service history and the state of the market at the date of death will rarely produce a figure HMRC would consider a realistic open market value.
The most defensible position is a valuation that documents the car’s actual condition, accounts for its history, and can demonstrate how the figure was arrived at.
Special Cases Worth Knowing About
Private number plates
If the car carries a personalised number plate, it cannot simply be valued as part of the vehicle. HMRC’s own guidance treats the right to use a particular registration as a separate intangible asset, distinct from the car itself. That means the plate and the car need to be valued independently, each at open market value at the date of death. The plate can be retained by the estate or transferred, but its value must be declared separately. Removing a private plate from a vehicle costs £80 through the DVLA.
Classic cars
Standard book values do not apply to classic cars, and most consumer platforms are not designed to handle them. Motorway explicitly states it does not have classic car buyers in its network. A classic car valuation needs specialist input, taking into account condition, originality, provenance, and comparable sales in the enthusiast market at the relevant date. This is not a job for an instant online quote.
Non-runners and write-offs
A car that is not roadworthy cannot be valued on the same basis as one that is. Standard valuations assume a retailable, roadworthy vehicle. For a non-runner or a category write-off, the defensible value is likely to sit closer to salvage or parts market evidence, and a specialist assessment becomes much easier to justify under HMRC’s requirement to make the fullest enquiries reasonably practicable.
So What Should You Actually Do?
Start by gathering the basic facts about the car: registration number, current mileage, condition, service history, number of keys, and any known mechanical faults or bodywork damage. Without these details, any figure you arrive at will be difficult to evidence if HMRC asks questions.
From there, executors typically have three options.
1. Use Swift Values’ Probate Vehicle Valuation Service
Most trade-level tools used to produce date-of-death valuations are only available to solicitors and professional estate practitioners, not to private executors. Swift Values has built a service specifically to fill that gap. For £30 plus VAT, you upload the car’s details and photographs, a qualified valuer assesses the vehicle against industry pricing databases covering up to eight years of historic market data, and you receive an HMRC-compliant report pinned to the date of death. It is the simplest and most cost-effective route for the majority of estates.
Start your probate car valuation here.
2. Take the car to a buying service and get a written inspection offer
If the estate plans to sell the car, take it physically to a branch of We Buy Any Car or a similar service and obtain their final written offer after inspection. That figure, not the online quote, represents an evidenced price that HMRC is likely to accept.
3. Research and declare the value yourself
It is possible to use publicly available comparables such as AutoTrader listings to arrive at your own figure, and HMRC’s IHT400 guidance permits this. However, you must document your methodology carefully, adjust for the car’s actual condition, and be prepared to defend the figure if HMRC queries it. The risk sits with the executor.
A Final Note On Getting It Wrong
Dealing with the practicalities of an estate is stressful at the best of times, and most people are doing it while grieving, often without any prior experience of probate at all. The car on the driveway can feel like a minor detail in the middle of everything else that needs to be dealt with.
You are not alone in finding this confusing. Car valuations for probate trip up even experienced executors, and the rules around evidence, condition, and date of death values are not exactly well signposted.
The important thing to know is that getting it right does not have to be complicated or expensive. A car in an estate deserves the same careful attention as any other asset, but with the right support it is one of the more straightforward parts of the process to resolve.
If you have questions about valuing a car for probate, or you are not sure where to start, Swift Values is here to help. Get in touch and we will talk you through it.