What is Vehicle Depreciation? Calculation and Application Requirements for 2026

 THE CONCEPT OF VEHICLE DEPRECIATION AND ITS LEGAL ASSESSMENT

Vehicle depreciation compensation is not merely a technical term, but a type of compensation aimed at protecting property rights. In this section, we will divide the topic into two parts: first, we will examine the conceptual anatomy, and then the legal mechanism that gives rise to this right.

1. Conceptual Anatomy: What Exactly Is Depreciation?

When a vehicle is involved in an accident, it suffers two types of damage: material (physical) damage and economic (market) damage.

• Repair of Physical Damage: This involves straightening, repainting, or replacing parts of the vehicle's bodywork. The insurance company will cover this cost to the service center.
• Economic Damage (Loss of Value): Even if a vehicle is repaired with "zero defects," it has lost its "no paint damage/no replaced parts" status. In the used car market, buyers prefer the accident-free vehicle over two vehicles with similar characteristics. The price of an accident-damaged vehicle needs to be reduced to make it sellable. This price differenceis the vehicle's loss of value.

Why Doesn't Even an "Original Part" Prevent Depreciation?

Many vehicle owners think, "The part was replaced with an original one at an authorized service center, why should it lose value?" However, in the Turkish market, "replaced parts" are always a question mark. If the assembly isn't factory original, if the paint thickness changes, and if the accident record appears in the 5664 (Tramer) inquiry system, it automatically lowers the vehicle's market value.

2. Legal Grounds: Laws Protecting Your Rights

Claiming compensation for vehicle depreciation is not a favor, but a legal right. This right rests on three main pillars:

A) Highway Traffic Law No. 2918 (KTK)

This law establishes the liability regime in traffic accidents. Article 85regulates the liability of the operator and vehicle owner, Article 91 mandates that this liability be covered by insurance companies (Compulsory Financial Liability Insurance). In other words, the insurance company of the vehicle that hit you is legally obligated to compensate you for the resulting decrease in your assets.

B) Turkish Code of Obligations No. 6098 (TBK)

Diminution in value is a form of compensation for a "tort." According to Article 49 of the Turkish Code of Obligations , anyone who causes harm to another through a negligent act is obligated to compensate for that harm. Article 50 grants the court (judge) the authority to determine the amount and scope of the damage. Diminution in value directly falls under the definition of "actual damage" within the scope of these articles.

C) General Insurance Terms and Conditions and the Intervention of the Constitutional Court

Previously, insurance companies calculated depreciation based solely on their own restrictive "General Terms and Conditions" table. However, the Constitutional Court (AYM), in its annulment decisions in 2020 and subsequent years, overturned these limitations. The AYM stated: "Insurance companies cannot restrict the actual damages arising from the law for citizens through their own regulations." This decision is the most important revolution that paved the way for today's "Market Value" system.

3. Essential Criteria for Claiming Diminution in Value

To be eligible for compensation for depreciation following an accident, the following technical requirements must be met:

1. Fault Balance: You must not be entirely at fault in the accident. If you are 100% at fault, you cannot claim compensation for depreciation from your own car insurance (unless your comprehensive insurance includes a specific "depreciation coverage").
2. No Duplicate Damage: The damaged area of ​​the vehicle must not have been previously damaged, repaired, or repainted in another accident. The law assumes that "a part that has already lost value will not lose value again."
3. Statute of Limitations: You must file your claim within 2 years of the accident date . After 2 years and 1 day, the insurance company will refuse payment, citing the "statute of limitations."
4. Extent of Damage: Minor scratches and scuffs that can be removed with polishing usually do not cause a decrease in value. A decrease in value would require repainting, repair, or replacement of the part.

HOW IS VEHICLE DEPRECIATION CALCULATED? CALCULATION METHODS AND CRITERIA

The "mathematical coefficient formula" previously used by insurance companies, which often resulted in losses for vehicle owners, has been annulled by the Constitutional Court. Now, the "Market Value Basis" is the standard for calculations. In this section, we will detail the criteria used to determine a vehicle's value decrease and how appraisers perform this calculation.

1. Market Value Method: Determining Actual Damages

This is the basic method accepted in current legal practice. This method seeks to answer the following simple but effective question: "How much would this vehicle sell for today if it hadn't been in an accident, and how much would it sell for today in its damaged condition?"

The following four main data sets are combined during the calculation:

1. The Vehicle's Pre-Accident Second Hand Market: The vehicle's make, model, equipment package, mileage, and market popularity at the time of the accident are examined.
2. Nature and Severity of Damage: There is a huge difference in value between simply repainting a fender and repairing the chassis or airbags. Major structural damage maximizes the depreciation in value.
3. Repair Quality: Was the part replacement done with an original part? Was the repair performed at an authorized service center or a private repair shop? While a record showing "Original Part Replacement" provides more credibility in the market compared to "Repair/Correction," it still results in a decrease in value.
4. Vehicle History (Tramer Inquiry): If the vehicle has no damage history (no defects/no paintwork), its value will depreciate significantly in its first accident. However, for a vehicle that already has 5-6 painted parts, the value loss from a new paint job will be minimal.

2. Critical Factors Affecting the Amount of Compensation

Experts and insurance adjusters use these “golden variables” when preparing their reports:

• Mileage Effect: There used to be a 165,000 km limit, but that no longer exists. However, the rule is: as mileage increases, the vehicle's "lifespan" is assumed to decrease, so the depreciation due to an accident also decreases mathematically. Vehicles with low mileage (near new) experience the highest depreciation.
• Vehicle Age: As a vehicle ages, its market value decreases. Generally, vehicles over 10 years old tend to experience less depreciation because the wear and tear on parts is higher.
• Part Type:
  • Parts that depreciate in value: Doors, fenders, hood, roof, trunk lid, chassis, underbody, pillars.
  • Controversial/Low-impact parts: Plastic bumpers, headlights, wipers, rims, and windows. (In the new regulations, these parts may also experience a slight decrease in value due to "labor and paint" costs).

3. Why is an Independent Expert Report Important?

Insurance companies usually determine a figure using their own software and offer you the "lowest" amount. However, you are not obligated to accept this offer.

• Arbitration and Pre-Litigation Preparation: A “Vehicle Depreciation Assessment Report” prepared by an independent insurance expert is the strongest evidence in court or before the Insurance Arbitration Commission.
• Technical Details: The report includes micron values ​​of the parts, reasons for replacement, and comparisons with similar vehicles on the market. This report allows you to pit your "real market data" against the insurance company's "formula".

4. Increased Demand for Commercial Vehicles: Loss of Earnings

If the vehicle involved in the accident is a taxi, service vehicle, rental car, or transport truck, it can claim not only "Diminution in Value" but also "Loss of Earnings" for the days the vehicle is in service

• Note: Loss of earnings cannot be claimed from compulsory motor insurance (ZMSS); it must be claimed directly from the at-fault vehicle owner or driver.

 PROCEDURE FOR APPLYING TO THE INSURANCE COMPANY AND THE INSURANCE ARBITRATION COMMISSION PROCESS

Obtaining compensation for vehicle depreciation is not a process that ends with a simple phone call. The Highway Traffic Law establishes a specific procedure and sequence for this process. Failure to follow this procedure may result in your case being dismissed on procedural grounds, even if you are in the right.

1. First Step: Required Written Application to the Insurance Company

Article 97 of the Turkish Traffic Law No. 2918 , submitting a written application to the relevant insurance company before filing a lawsuit for compensation claims arising from traffic accidents is a "prerequisite for litigation".

• Which Insurance Should You Apply For? You should apply for the Compulsory Financial Liability Insurance (ZMSS/Traffic Insurance) of the party at fault in the accident, not your own comprehensive insurance (unless you have special coverage) .
• Required Documents: Accident report, photos of the vehicles, photocopies of the vehicle registration documents, repair invoice, and expert report (if available).
• Waiting Period: The insurance company has a legal period of 15 days to respond to your application . You cannot pursue any other legal avenue before this period expires.

Important Warning: Insurance companies often deposit a sum of money into your account after you file a claim. However, this amount is usually significantly less than the actual market loss. Receiving this money does not mean you are waiving your remaining rights; however, you should be cautious when signing a release form.

2. Second Step: Insurance Arbitration Commission (Fast Track)

If your insurance company rejects your claim or makes an incomplete payment, it makes much more sense to apply to the Insurance Arbitration Commission than to file a lawsuit in civil courts that could drag on for years

What are the advantages of insurance arbitration?

1. Speed: While normal court proceedings take 2-3 years, the arbitration process is completed in an average of 4 to 8 months .
2. Expertise: Your case will be reviewed only by “Arbitrators” who specialize in insurance law.
3. Finality: Decisions below a certain amount are final and can be enforced immediately. For higher amounts, an appeal is possible, but the process is still much faster.
4. Low Cost: Application fees are much more reasonable compared to court costs.

3. How does the process work?

1. File Acceptance: After your application, a rapporteur reviews your file and, if there are no deficiencies, assigns it to a referee.
2. Expert Appointment: The arbitrator requests a report from an independent expert to clarify the vehicle's depreciation. At this stage, the calculation is based on the "Market Value" mentioned in Section 2.
3. Decision: After receiving objections from the parties to the expert report, the arbitrator will render the final decision.
4. Enforcement Based on a Court Order: An arbitration award has the force of a court order. If the insurance company fails to make the payment, enforcement proceedings can be initiated directly based on this award.

4. Important "Key" Points to Pay Attention To

• The Waiver Trap: Insurance companies may try to get you to sign a document stating "I waive all my rights" when making a payment. Signing such documents without legal assistance can cost you thousands of liras in outstanding balances.
• Attorney's Fees: If you file for arbitration through a lawyer and win, the attorney's fees (according to the proportional rate) will also be collected from the insurance company.
• Partial Claim: If you are unsure of the exact amount of the depreciation, you can file your claim as "uncertain claim" or "partial claim," and increase the amount after receiving the expert report.

CONCLUSION: GOLDEN RULES TO AVOID LOSS OF RIGHTS DURING VEHICLE DEPRECIATION PROCESS

Vehicle depreciation compensation is a right that, when managed correctly, alleviates the vehicle owner's losses; however, if managed incorrectly, it can get lost in the complex procedures of insurance companies. At the end of this guide, we offer a concise checklist to protect both your wallet and the value of your vehicle.

1. Checklist to Facilitate the Process

Make sure you follow these steps from the time of the accident until the day the money is deposited into your account:

1. Accident Scene: Take photos not only from a wide angle, but also showing the details of the damage and the license plates of the vehicles involved.
2. Report: In the accident report, clearly and unequivocally state the "position of the vehicles" and "how the accident occurred."
3. Service Selection: Request a detailed repair bill from the service center that will repair your vehicle, including a list of replaced parts and details of labor
4. Expert Report: Get an opinion from an independent expert, other than the expert appointed by the insurance company, to determine your "true loss."
5. Application Registration: Submit your application to the insurance company via email or courier (registered mail with return receipt) and record the "date of notification".

2. Common Mistakes and Warnings

• Don't say, "Minor damage, not worth buying": A depreciation that seems like 10,000 TL today could turn into a 50,000 TL bargaining obstacle when you sell your car tomorrow.
• Beware of Unauthorized "Claims Consulting" Companies: Stay away from entities in the market that claim to handle your claim but are not legal professionals. This is a legal process that should only be conducted by lawyers and authorized insurance adjusters.
• Don't forget the statute of limitations: You cannot pursue any legal action after two years have passed since the date of the accident . Don't assume "the case will drag on anyway," you must also be within this time limit to file a lawsuit.

3. Projections for 2026 and Beyond

With technological advancements, sensors, driver assistance systems, and advanced body components in vehicles are increasing repair costs. This, in turn, is causing vehicle depreciation amounts to reach higher figures each year. The Supreme Court's adoption of the "full actual damage" principle has paved the way for even high-mileage or older vehicles to receive a certain amount of compensation.

Final Words

Your vehicle is your property, and any decrease in its value due to the fault of another constitutes a violation of your constitutional right to property. A vehicle depreciation lawsuitis the most powerful weapon available to you to remedy this violation. By filing your application before the legal deadlines and using accurate calculation methods, you can receive what you are entitled to.