An insurance write-off is a vehicle that an insurer has decided not to repair after an accident, fire, flood or theft recovery. This is usually because the repair bill would be too high compared with the car's value, or because the damage makes it unsafe. The insurer pays a settlement instead, and the car is given a salvage category that is recorded on the MIAFTR database (the Motor Insurance Anti-Fraud and Theft Register).
A write-off is not always a wreck. Some are repaired and driven again, and some are sold on at a discount. What matters is knowing the category and whether the repair was done properly.
How does a car become a write-off?
Insurers weigh the likely repair cost against the car's pre-accident market value, plus the salvage value of what is left. If repairing it costs too much compared with what the car is worth, it is usually written off. The exact threshold varies between insurers, so there is no single percentage that applies to every claim.
This is why older, lower-value cars can be written off after damage that would be a routine repair on a newer or more valuable model. A write-off can also be declared when the damage is so severe that the car cannot be made safe, whatever it is worth.
The UK write-off categories explained
For vehicles written off on or after 1 October 2017, the categories are:
- Category A: The car is scrap only. It should be crushed entirely, with no parts salvaged for reuse. It must never return to the road.
- Category B: The body shell should be crushed, but some parts, such as the engine or gearbox, can be salvaged. The car itself must never return to the road.
- Category S: The car has structural damage, for example to the chassis or crumple zones. It can be repaired and returned to the road, but the repair must be done to a safe standard.
- Category N: The car has non-structural damage, such as electrical, cosmetic or mechanical faults. It can be repaired and returned to the road, and it is not classed as having damaged its structure.
Before October 2017 the system used Categories A, B, C and D. Cat C meant repairable but uneconomic, and Cat D meant repairable but the repair cost was less than the value. Older cars may still show these letters. Cat C and D were replaced by S and N, and the two systems are not a like-for-like match.
Can a write-off go back on the road?
Cat S and Cat N cars can legally return to the road once they have been repaired. Cat A and Cat B cars cannot. Many Cat S and N cars are bought at auction by traders or repairers, fixed and resold.
Quality varies widely. A well-repaired Cat N car can be a sound purchase at a lower price, while a poorly repaired Cat S car may have hidden problems. Independent inspection and repair evidence matter far more than the label alone.
Why does a write-off record matter when buying?
- Value: Written-off cars usually sell for less than equivalent cars without a write-off record, and they can be harder to resell later.
- Safety: Structural repairs, airbags and crumple zones need proper workmanship.
- Insurance: Some insurers will not cover previously written-off cars, or charge more. Always tell your insurer the full history.
- Disclosure: A seller should not misrepresent a car's history. If you are told the car has never been damaged and it later turns out to be a write-off, you may have grounds to complain, but it is far better to find out before you pay.
How to check if a car has been written off
A vehicle history check searches several records for the registration number. For write-offs, it looks at the insurance loss data recorded on MIAFTR. A good check can also show other things that matter alongside a write-off marker:
- The DVSA MOT history, including past failures, advisories and recorded mileage readings
- Whether the Police National Computer (PNC) has a stolen marker
- Outstanding finance that could affect your ownership
- Mileage discrepancies that may suggest clocking
- The number of previous keepers
You can check a vehicle's registration on motorpeek.com before you view the car or hand over any money. We are an independent service and are not affiliated with the DVLA, DVSA or any government body. No check can cover every possible problem, so treat the report as one part of your research.
Extra steps before buying a previously written-off car
- Ask the seller for repair invoices, photos of the damage and details of the garage that did the work.
- Pay for an independent inspection by a qualified mechanic or an engineer who can assess structural repairs.
- Compare the V5C logbook details with the car itself, including the VIN and registration.
- Check that the MOT history is consistent, and look for recent changes in advisories or sudden mileage jumps.
- Get insurance quotes first, so you know the real cost of ownership.
- Be cautious if the price is far below similar cars, or if the seller is vague about the history.
The bottom line
An insurance write-off means the insurer decided the car was not worth repairing or was too badly damaged. Cat A and B cars must never return to the road. Cat S and N cars can, and they range from well-fixed bargains to risky buys. Check the history, inspect the car properly and only buy if you are comfortable with the category, the price and the evidence of repair.
Frequently asked questions
What does insurance write-off mean on a car?
It means an insurer has decided not to repair the vehicle after damage or loss, and has paid out a settlement instead. This is usually because repairs would cost too much compared with the car's value, or the damage makes it unsafe. The car is then given a salvage category and recorded on MIAFTR.
Can you drive a car that has been written off?
It depends on the category. Cat A and Cat B cars must never return to the road. Cat S and Cat N cars can be driven again once they have been properly repaired, and they may need to pass an inspection or MOT. You should tell your insurer about the write-off history.
What is the difference between Cat S and Cat N?
Cat S means the car had structural damage, for example to the chassis or another load-bearing part. Cat N means the damage was non-structural, such as cosmetic, mechanical or electrical. Both can be repaired and put back on the road, but Cat S repairs deserve closer scrutiny.