A car write off check is one of the most important steps you can take before buying a used vehicle. DVLA data shows that 562,185 vehicles were recorded as written off in 2024 alone, which works out at roughly one every 60 seconds. Many of these cars are repaired and returned to the road, but not all repairs are carried out to a safe standard. If you are buying from a dealer, they are legally required to tell you about any write-off history. Private sellers have no such obligation, and some may withhold this information to secure a higher sale price. Running a write off check with the vehicle's registration number reveals whether it carries a Cat A, Cat B, Cat S or Cat N marker, so you know exactly what you are buying.
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When an insurer declares a vehicle a total loss, it is placed into one of four categories based on the type and severity of the damage. The current category system was introduced by the Association of British Insurers in October 2017 to replace the old Cat C and Cat D labels, shifting the focus from repair cost alone to whether the vehicle's structure has been compromised.
The old Category C and Category D labels are no longer used for new write-offs but still appear on vehicles that were classified before October 2017. Cat C is broadly equivalent to today's Cat S, and Cat D to Cat N, although the old system was based purely on repair cost rather than the nature of the damage.
Our write off check searches the Motor Insurance Anti-Fraud and Theft Register (MIAFTR), a centralised database maintained by the Motor Insurers' Bureau. MIAFTR holds records of vehicles that have been written off or reported stolen across the UK, as required by the Code of Practice for the Disposal of Motor Vehicle Salvage. Once a write-off marker is recorded on MIAFTR, it remains against the vehicle permanently and cannot be removed, even after full repair. This is why a write off check is essential before purchasing any used car, as it reveals history that a seller may not disclose.
Understanding the write-off process helps you make informed decisions, whether you are the owner of a damaged car or a buyer looking at a vehicle with write-off history.
Cat S and Cat N vehicles can offer genuine savings, often priced 20% to 40% below equivalent cars with clean histories. However, those savings come with risks that require careful checks before you commit.
A paid vehicle history check confirms the write-off category, date, and whether the car has outstanding finance, has been stolen, or has mileage discrepancies.
For Cat S vehicles in particular, pay for an independent engineer inspection costing around £150 to £250. They will check structural alignment, panel gaps and overall repair quality.
Request invoices, photographs and a written record of exactly what was damaged and how it was repaired. Be cautious if the seller cannot provide this evidence.
Bear in mind that insuring a previously written-off car typically costs 15% to 20% more than an identical vehicle with no write-off marker. Some insurers will decline to cover Cat S or Cat N cars entirely, so get insurance quotes before agreeing to purchase. The write-off marker stays on the MIAFTR database permanently and will always affect the vehicle's resale value.
An insurance write-off is a vehicle that an insurer has declared either too damaged to be safely driven again, or still repairable but not worth fixing given the cost. Insurers use a repair-to-value ratio, typically between 50% and 60% of the car's market value, to make this decision. If your car is worth £5,000 and repairs exceed £3,000 under a 60% threshold, it would be classed as beyond economical repair and written off.
When your car is written off, ownership normally transfers to your insurer. You will receive a payout based on the car's market value at the time of the incident, not what you originally paid. Your no-claims bonus may be affected depending on fault, and your next premium could increase. If you believe the payout is too low, you have the right to challenge the valuation with evidence such as recent sale prices for similar vehicles.
A Cat S or Cat N vehicle can be a worthwhile purchase if it has been professionally repaired and you have seen full documentation of the work carried out. However, you should expect insurance premiums to be around 15% to 20% higher, and resale value will always be lower than an equivalent car with no write-off marker. Always commission an independent engineer inspection, check the full MOT history, and run a vehicle history check before buying.
In October 2017 the Association of British Insurers updated the salvage code to focus on the type of damage rather than just the cost of repair. Categories A and B remained the same, but Cat C was replaced by Cat S (structural damage) and Cat D by Cat N (non-structural damage). This change gives buyers clearer information about whether a vehicle's safety frame has been compromised, rather than simply knowing that repair costs exceeded a certain figure.
After you file a claim, your insurer sends an assessor to inspect the damage. The assessor calculates the cost of repair using approved workshop rates and new OEM parts, then compares that figure against the vehicle's current market value using a repair-to-value ratio, usually set between 50% and 60%. If the repair cost exceeds this threshold, or if structural damage makes the car unsafe to restore, the insurer will declare it a write-off and assign a category.
Yes, most major insurers will cover a Cat S or Cat N vehicle, although premiums tend to be higher. Some insurers may require an independent engineer's report before offering cover, and a small number may decline to quote altogether. It is important to disclose the write-off status when getting quotes, because failing to do so could invalidate your policy.
Yes. Once a vehicle is recorded as written off on the MIAFTR database and the DVLA's records, that marker stays for the life of the vehicle. It cannot be removed, even after the car has been fully repaired and returned to the road. This permanent record is why write-off vehicles sell for less than equivalent cars with a clean history.
If your car is on a finance agreement and gets written off, you are still responsible for repaying the outstanding balance. The insurance payout will go towards clearing the debt, but if the payout is less than what you owe, you must cover the difference yourself. Gap insurance is designed to cover this shortfall, so it is worth considering when you take out a finance agreement.