Diminished value (merkantiler Minderwert)

The diminished value (merkantiler Minderwert) – colloquially also called the loss in value after an accident – describes the financial disadvantage a vehicle owner suffers because their vehicle is regarded as an “accident vehicle” after a crash. Even if the damage has been repaired completely and professionally, an accident vehicle generally fetches a lower price on the used-car market than a comparable accident-free vehicle.

The reason lies in market behaviour: buyers are wary of repaired accident vehicles because of possible hidden defects and are therefore only willing to pay less. It is exactly this price difference that the diminished value compensates.

Two forms of loss in value must be distinguished:

• Diminished value: A purely market-driven loss in value despite a flawless repair – solely because of the stigma of the accident.
• Technical diminished value (technischer Minderwert): A loss in value because technical or visual residual defects remain despite the repair, such as minor deviations in panel gaps or paint finish. It occurs less frequently in modern repair practice.

Damage assessment reports (Schadengutachten) usually state the diminished value; a technical diminished value is only stated if specific residual defects are to be expected.

Under established German case law, the diminished value is an independent, recoverable item of damage. The injured party is generally entitled to it regardless of whether they have the vehicle repaired, settle the claim on a notional basis (fiktive Abrechnung) or sell the vehicle later.

• A prerequisite is significant damage; mere minor damage that is not relevant for disclosure does not usually give rise to a diminished value.
• Vehicle age and mileage are taken into account in the assessment; case law has increasingly relaxed rigid age limits, so that older vehicles may also suffer a loss in value in individual cases.
• The amount is estimated by the trial judge – the most important basis being the expert report.

There is no statutorily prescribed calculation method. In practice, assessors use recognised estimation methods and valuation models that typically weight the following factors:

• the replacement value (Wiederbeschaffungswert) and resale value of the vehicle,
• the amount of the repair costs and the share of labour versus material costs,
• the extent and nature of the damage (e.g. whether load-bearing parts or only attachment parts are affected),
• vehicle age, mileage and marketability,
• any previous damage.

The assessor selects the method appropriate to the individual case, checks the plausibility of the result against the market and substantiates it comprehensibly in the report.

A nearly new used car suffers side damage in an accident that was not the owner's fault, with load-bearing structures also affected. The specialist workshop repairs it fully in accordance with the manufacturer's specifications. When the owner later sells the car, however, they must disclose the accident damage – prospective buyers therefore offer noticeably less than for a comparable accident-free vehicle. It is precisely this difference that the diminished value stated in the expert report reflects, which the opposing party's liability insurer generally reimburses in addition to the repair costs.

For injured parties, the diminished value is a frequently overlooked item of damage: anyone who merely submits a cost estimate often forfeits this claim, because only an expert report substantiates the loss in value reliably.

For assessors, the methodically sound derivation of the diminished value is a core element of report quality. Since insurers regularly reduce or dispute this item, a comprehensible methodology and market-based plausibility checks are crucial.