What Is Diminished Value?

Diminished value, defined

Diminished value is the difference between what your vehicle was worth before an accident and what it’s worth afterward — even when it’s been completely and correctly repaired. Put two identical cars side by side, same year, make, model, and mileage; if one has an accident on its record and the other doesn’t, the one with the accident sells for less. That price gap is your diminished value.

Say your car was worth $30,000 the day before the crash. After a flawless repair, comparable buyers will only pay $26,000 because of the accident history. You’ve lost $4,000 in value — and in most cases the at-fault driver’s insurer owes it to you. The repair fixed the car; it didn’t fix the resale price.

Why your car loses value — even after a perfect repair

The instant an accident is reported, it generally lands on a vehicle history report like Carfax or AutoCheck — and it stays there for good. Dealers pull those reports before they make a trade-in or resale offer, and private buyers check them too. A clean history is a selling point; an accident is a red flag, regardless of how well the work was done. So buyers discount the car, and it’s worth measurably less than it was the day before.

Diminished value vs. normal depreciation

It’s easy to confuse the two, but they’re different. Depreciation is the value any car loses gradually with age and mileage — it happens to every vehicle whether or not it’s ever in a crash. Diminished value is the additional loss caused specifically by the accident and its permanent mark on your car’s history. That extra loss is what a diminished value claim recovers.

How much value does a car lose?

There’s no flat percentage — it depends on your specific vehicle. As a rule of thumb, the loss tends to be larger for newer cars, lower-mileage cars, and more valuable makes, because those are the vehicles where an accident history moves the price the most. Older, high-mileage, or lower-value cars may have little measurable diminished value. The only way to know your number is to measure it.

How diminished value is measured

A credible figure comes from the market, not a formula. A proper comparable-vehicle analysis looks at what cars like yours actually sell for — same year, make, model, trim, and mileage — with and without an accident on record. The spread is your real, evidence-backed diminished value. Insurers often counter with the 17c formula, a capped calculation that usually understates the loss — which is exactly why a documented valuation matters.

Diminished value FAQ