How Is My Car’s Value Worked Out If It’s Written Off?

If your car is written off, your payout is based on its pre-accident market value — what a comparable car in the same condition would have sold for immediately before the accident — not what you originally paid for it or what you still owe on finance.

Hearing that your car has been written off can feel frustrating, especially if the damage looks repairable. Understanding how the figure is actually calculated helps you know what to expect, and what you can challenge if the number doesn't look right.

Why Do Insurers Write Cars Off?

A car is declared a total loss when the cost of repairing it isn't economically justified compared to its value, or when the damage makes it unsafe to repair. Insurers typically apply a threshold — often somewhere between 50% and 70% of the car's market value — above which repair simply doesn't make financial sense, even if the car looks fixable.

How Is "Market Value" Actually Calculated?

Insurers use trade guides such as Glass's Guide, CAP, and comparable listings data to establish what your specific make, model, age, mileage, and condition of car was worth on the open market immediately before the accident. This is sometimes called the pre-accident value (PAV). It's an assessment of current worth, not sentimental or original purchase value — so the figure is often lower than people expect, particularly for older cars.

What Are the Write-Off Categories?

Since October 2017, UK insurers have used four categories:

• Category A — the most severe. The vehicle must be crushed and cannot be resold, even for parts.

• Category B — the body shell must be destroyed, though some parts may be salvaged.

• Category S — structural damage. The car can legally return to the road, but only after professional repair and inspection.

• Category N — non-structural damage (cosmetic, electrical, or mechanical). The car can usually be repaired and returned to the road without a structural inspection.

Categories S and N replaced the older Category C and D markers. If you're comparing quotes on a used car, a Cat S or N history is worth checking for, as it affects resale value.

What Gets Deducted From My Payout?

Your settlement is generally calculated as: pre-accident market value, minus your policy excess and any outstanding finance. If you want to keep the vehicle (usually only possible for Category S or N), the insurer will also deduct its salvage value from the payout.

What If I Think the Valuation Is Too Low?

You're entitled to challenge it. Useful evidence includes:

• Listings for comparable vehicles for sale at the time of the accident

• Recent auction results for similar cars

• Receipts for recent repairs, upgrades, or accessories that add value

• A request that the insurer reconsider using a different trade guide

If you remain unhappy after raising this with the insurer, you can escalate the matter to the Financial Ombudsman Service. If the accident was non-fault, this process is separate from — and often supported by — the wider handling of your claim, which is where our team can help.

Can I Still Get a Replacement Car While This Is Sorted?

If the accident wasn't your fault, yes — you can usually remain in a credit hire vehicle while your total loss claim is being valued and settled. See our guide on what credit hire is and whether you're entitled to one.

Frequently Asked Questions

• Is the payout the same as what I paid for the car?

  No. Cars depreciate, so the payout reflects what the car was worth immediately before the accident, not its original price.

• What if my car is on finance and worth less than I owe?

  This is known as being in "negative equity," and it's a common source of disputes after a write-off. GAP insurance, if you hold it, can cover this shortfall — check your finance agreement and any GAP policy for what applies to you.

• Can I keep my written-off car?

  Usually only for Category S or N write-offs. The insurer deducts the estimated salvage value from your payout, and you'll need the car professionally repaired, inspected, and re-registered before it can go back on the road.

• Does a write-off affect the car's history permanently?

  Yes. The write-off marker stays on the vehicle's history indefinitely and will show up on any full vehicle history check when it's eventually sold.

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This guide provides general information for England and Wales and does not constitute legal or financial advice. Every claim is assessed on its own facts — for help with your specific situation, get in touch with our team at Back on the Road UK.