What is Vehicle Depreciation – How to Calculate It

What is Vehicle Depreciation – How to Calculate It. Following a traffic accident, even if the damage to the vehicle is repaired and its original performance is restored, the negative impact on its second-hand market value persists. This negative impact is expressed by the legal and commercial concept of “vehicle diminished value” (değer kaybı). Diminished value is of great importance for the compensation of the actual loss suffered by vehicle owners after an accident.

Thanks to modern vehicle technologies, the repair of a damaged automobile often yields results that are close to perfect; however, the accident record (Tramer/damage record) in the vehicle’s history creates suspicion and distrust among potential buyers. This situation inevitably leads to a decline between the vehicle’s damage-free market value before the accident and its second-hand sales value after being repaired. This difference in value is defined as the direct financial loss suffered by the vehicle owner due to the accident and legally required to be compensated. Therefore, diminished value represents a permanent deficiency in the vehicle’s commercial identity, independent of the repair costs. What is Vehicle Depreciation – How to Calculate It.

What is Vehicle Diminished Value

Vehicle diminished value refers to the difference in value between a motor vehicle’s damage-free second-hand market value before an accident and its second-hand market value after being damaged in a traffic accident and subsequently repaired. Regardless of how flawlessly the vehicle is repaired, the recorded damage information creates a “damaged vehicle perception” in the market, leading to a decrease in the vehicle’s market price. This difference constitutes the direct financial loss that must be compensated to the vehicle owner.

Vehicle Diminished Value Calculation Formula

In the calculation of vehicle diminished value, two main methods stand out, especially in judicial processes: the Court of Appeals (Yargıtay) method and the former Mandatory Financial Liability Insurance (ZMSS) General Conditions formula. Following the Constitutional Court’s annulment decision in 2020, the principles of determining the actual loss in the Turkish Code of Obligations (TBK) are applied, and the calculation is based on the market value.

Court of Appeals Method (Actual Loss Principle)

According to the established jurisprudence of the Court of Appeals, diminished value is calculated by determining the difference between the vehicle’s second-hand market value free of damage and its second-hand market value after repair, as of the date of the accident:

• The damage-free market value before the accident, and
• The market value after the repair.

This calculation is performed according to free market conditions, taking into account the vehicle’s age, the extent of the damage, and the characteristics of the damaged parts. Since this method is based on market conditions, it generally yields a higher compensation amount that reflects the vehicle owner’s actual loss compared to the ZMSS formula.

Current Expert/Appraiser Calculation Elements

Expert appraisers consider the following elements within the scope of the actual loss principle when determining the vehicle’s diminished value:

• Vehicle Market Value: The second-hand market price on the date the accident occurred.
• Base Rate: A fixed rate determined by considering the vehicle’s age and mileage.
• Part Coefficient: A rate determined by the structural and functional importance of the damaged parts.
• Damage Area Coefficient: A coefficient determined by the location and impact of the damage on the vehicle.
• Damage History: Previous damage records, if any.

ZMSS Formula (Former Method)

The ZMSS General Conditions formula dated 01.06.2015 calculated the diminished value using mathematical coefficients (mileage coefficient, damaged part coefficient, paint coefficient). While insurance companies generally based their calculations on this formula, which often resulted in lower figures, the principle of actual loss (Court of Appeals method) has become prioritized in legal proceedings following the Constitutional Court’s decision.

How to Claim Vehicle Diminished Value

Vehicle diminished value compensation is claimed from the Mandatory Financial Liability Insurance (Traffic Insurance) policy of the counterparty who was at fault in the accident.

The steps of the compensation process are as follows:

1. Application to the Insurance Company: A written application is made to the insurance company of the vehicle at fault in the accident.
2. Response Period: Insurance companies are obligated to examine the claim and respond to the applicant within 15 days from the date of application.
3. Legal Remedies: In the event that the application is rejected, inadequately assessed, or not responded to in time, the rightful owner may apply to:
   • The Insurance Arbitration Commission.
   • File a lawsuit in the Civil Court of Commerce.

Legal Liability and Source of Compensation

Pursuant to the Turkish Commercial Code (TTK) and the Highway Traffic Law (KTK), multiple persons and institutions may be responsible for diminished value compensation:

• Mandatory Financial Liability Insurer: According to the relevant articles of the KTK, the traffic insurer of the at-fault party is liable to compensate for the resulting damage and diminished value. The insurer is jointly and severally liable, up to a certain limit, for the responsibilities of the at-fault vehicle operator.
• At-Fault Vehicle Operator and Driver: The vehicle owner (operator) and the driver are jointly and severally (together and chain-linked) liable for damages arising from tortious acts under the Code of Obligations. The vehicle owner can seek and collect the diminished value not only from the insurance company but also from the at-fault vehicle owner and driver.

Vehicle Diminished Value Application

The submission of complete documents for the diminished value application is critical for a fast and positive outcome of the process.

Required Documents

The main documents that must be included in the application file are:

• Accident Scene Investigation Report (Kaza Tespit Tutanağı) prepared at the time of the accident.
• Damage Assessment Report and the Report showing the Fault Ratios.
• Appraiser’s Report determining the vehicle’s diminished value (It is recommended to obtain one from an expert appraiser).
• Photographs showing the damage from every angle.
• Invoices for parts and labor related to the repair (if any).
• Vehicle Registration Certificate (Ruhsat), Driver’s License, and Mandatory Traffic Insurance Policy.

Note: Direct application for vehicle diminished value cannot be made via E-Devlet (e-Government). The application must be made in writing to the insurance company. However, damage records and appraiser reports can be viewed via E-Devlet.

2nd Vehicle Diminished Value Calculation

A fundamental condition that must be met to claim vehicle diminished value is that the damaged part has not been previously repaired due to another accident. Claims for diminished value for vehicles with a damage history or for parts damaged a second time in the same area are generally rejected.

• Damage in the Same Area: A vehicle cannot claim diminished value due to damage sustained twice in the same area. If the same area was previously damaged, the diminished value claim will be rejected.
• Severe Damage/Total Loss (Salvage) Record: Diminished value cannot be claimed for vehicles with a severe damage record or those previously designated as a “total loss” (pert total/with withdrawal certificate). This is because these vehicles are already considered to have lost significant value prior to the current accident.

Therefore, if the damage occurred in a different area, a second diminished value calculation and claim may be possible, independent of the first damage; however, this claim will be rejected for a second damage in the same area.

Vehicle Diminished Value Calculation Example

Assuming a vehicle with a market value of 1,000,000 TL was damaged and repaired as a result of an accident, two different calculation methods may yield the following results:

Method	Calculation Detail	Calculated Diminished Value
Court of Appeals Method	Damage-Free Market Value (1,000,000 TL) – Value After Repair (930,000 TL)	70,000 TL
ZMSS Formula (With Example Coefficients)	Market Value x Coefficients (Mileage, Part, Paint Multipliers)	40,000 TL

As seen in this example, the actual loss principle adopted by the Court of Appeals (market value difference) can result in a higher compensation amount compared to the result found by the ZMSS formula using mathematical coefficients. While insurance companies generally rely on the ZMSS formula, the actual loss principle is taken as the basis in legal proceedings.

Vehicle Diminished Value Calculation Criteria

There are fundamental conditions that must be met for the compensation claim to be accepted, as well as elements considered in the calculation of diminished value.

Factors Affecting the Amount of Diminished Value

The factors considered during expert examination that directly affect the amount of diminished value are:

• Vehicle Brand, Model, and Technical Specifications
• Vehicle Age and Mileage on the Date of the Accident
• Nature of the Damage and the Damaged Area on the Vehicle After the Accident
• Type and Number of Damaged Parts (Bodywork, chassis, painted parts, etc.)
• Quality of the Repair Process (Original part or aftermarket?)
• Market Value Before and After the Accident
• Previous damage history (if any)

Application Conditions (Reasons for Rejection)

The following basic conditions must be met to claim diminished value compensation; otherwise, the claim may be rejected:

1. Bilateral Accident: In unilateral accidents, diminished value cannot be claimed because the driver is 100% at fault.
2. No-Fault Condition: The party claiming diminished value must not be 100% at fault in the accident.
3. Damage and Repair: Damage must have occurred in the vehicle as a result of the accident and must have been repaired. Simple procedures that can be remedied by mini-repair do not lead to diminished value.
4. Parts History: The damaged parts must not have been previously repaired due to another accident.
5. No Severe Damage Record: The vehicle must not have a severe damage record (ağır hasar kaydı).
6. Statute of Limitations: The 2-year statute of limitations from the date of the accident must not have expired.

Statute of Limitations

Pursuant to the Code of Obligations, the time limit for filing a diminished value lawsuit is subject to a legal 2-year statute of limitations. This period begins from the date the rights holder learned of the damage and the person who caused the damage. However, in any case, there is also a supreme statute of limitations of 10 years from the date the accident occurred. What is Vehicle Depreciation – How to Calculate It.

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