Vehicle Value Loss Formula: How to Calculate It Yourself?

Introduction — Why Should You Ask Yourself the Question “Calculate Vehicle Depreciation”?

Repairing your vehicle after an accident covers the material aspect of the damage; however, the repaired vehicle may not always retain its former market value. This is where vehicle depreciation comes into play: the decrease in the second-hand market value of the vehicle after the accident. It is necessary to pursue this compensation, apply in a timely manner, and claim it with accurate calculations.

Issue/Need: What, how much, and within what time frame can I claim?

The claim for vehicle depreciation arises in cases covered by both comprehensive insurance and mandatory liability insurance. There are two main periods to consider in legal processes: 2 years from the date of learning about the damage and 10 years from the date of the accident. These periods are determined in accordance with the Turkish Code of Obligations Art. 72 and Traffic Law Art. 109.

Solution / Process Details — Steps to Take

1. Required Documents

• Accident assessment report (prepared by traffic police or the parties involved).
• Copy of vehicle registration and ID.
• Repair invoices and service reports.
• Expert or appraiser reports (if available, pre- and post-accident value assessments).
• Mileage records, sales advertisements (for market value comparison).

2. Insurance Application and Expert

• A written request for depreciation can be submitted to the insurance company within 15 days from the date of the accident. Insurance companies typically assign an expert and conduct damage assessment.
• Although the expert report is a primary document in official processes, an independent expert report is more decisive during the court stage.

3. Solutions if the Insurance Denies

• Insurance Arbitration Commission: An application can be made against the insurance company's denial within 8 weeks (56 days). Applications to the commission are free for amounts up to 150,000 TL.
• In cases of objection to the arbitration result or extra-arbitration situations, a lawsuit can be filed in the Civil/Commercial Court. Expert review is important in court processes.

Practical (Unofficial) Calculation Formula for Vehicle Depreciation

There is no single, clear formula in the law; depreciation is generally determined by an expert report. However, an approximate formula that can be used at home or for preliminary assessment is as follows:

Depreciation = (Vehicle Market Value × Damage Rate × Depreciation Coefficient) − Repair Cost

Explanation of Elements Used in the Formula

• Vehicle Market Value: Determined by sales advertisements of the same make-model-year and similar mileage or by appraisal assessment.
• Damage Rate: Percentage expression of the severity/location of the damage (e.g., body, chassis, electronics). The rate increases for chassis or structural damage.
• Depreciation Coefficient: The coefficient that decreases according to the vehicle's age and mileage. Example: for vehicles aged 0-3 years approximately 15-20%, for 3-7 years approximately 10-15%.
• Repair Cost: The cost of the repair stated on the invoice (in most calculations, repair costs are considered a separate item or offset).

Sample Calculation (Simple, Schematic)

• Vehicle market value: 400,000 TL
• Damage rate (not chassis, moderate severity): 25%
• Depreciation coefficient (vehicle is 4 years old): 12%
• Repair cost: 40,000 TL

Calculation: (400,000 × 0.25 × 0.12) − 40,000 = (12,000) − 40,000 = −28,000 → As seen in this example, if the repair cost is high, the formula may yield a negative result; in practice, a negative result indicates that there is no depreciation, or different calculation methods may be applied. Therefore, court and expert findings are essential.

Statute of Limitations and Periods (in days/months/years)

• Relative statute of limitations: 2 years (730 days) from the date you learned about the damage and the party liable for compensation. If an application is not made within this period, the legal claim weakens.
• Absolute statute of limitations: 10 years (3,650 days) from the date of the accident in any case.
• Insurance notification: It is recommended to provide written notification to the insurance company within 15 days after the accident.
• Arbitration application: 8 weeks (56 days) from the date of denial.

These periods are in accordance with Turkish Code of Obligations Art. 72 and Traffic Law Art. 109; disputes regarding application periods are frequently raised in court.

Costs — Estimated Figures for 2026

Expenses in legal processes vary depending on the scope of the case. The estimated figures as of 2026 are as follows:

• Insurance Arbitration Commission: Free, valid for applications up to 150,000 TL.
• Court fees: The relative fee rate is approximately 7-7.5% (varies according to the claimed amount). Example: for a claim of 100,000 TL, the fee may be between ~6,800–7,500 TL (subject to annual Official Gazette adjustments).
• Expert fees: Between 1,500–15,000 TL (varies by type of expert).
• Attorney fees: Varies according to the agreement; generally includes success fee rate or hourly/nominal fee arrangement. Minimum case initiation costs and expenses are calculated separately.

Note: These figures are estimates. Relevant legislation and announcements in the Official Gazette should be checked for official fees and rates.

Supreme Court Jurisprudence — What to Pay Attention To?

• The Supreme Court emphasizes that statute of limitations rules must be strictly followed in depreciation claims; the 2-year condition from the date of learning about the damage is important.
• Supreme Court decisions indicate that the expert report alone may not be binding; independent expert assessments and market data must also be considered.
• Case law frequently illustrates that the vehicle's age and mileage are critical in determining the depreciation rate, and that percentages are kept lower for older vehicles.

How Do We Assist as Korkmaz Law Office?

As Korkmaz Law Office, with our experienced team based in Izmir, we provide the following services for vehicle depreciation claims arising from traffic accidents:

• Evaluation of your documents before application and determination of market value through expert/advertisement search.
• Preparation and follow-up of written requests to the insurance company.
• Legal representation during the Insurance Arbitration Commission or court process, selection of experts, and evaluation of reports.
• Evidence strategy and statute of limitations analysis to prevent loss of rights.

Collecting the correct documents, adhering to statute of limitations rules, and effectively using expert reports increase the chance of acceptance of the claim. Korkmaz Law creates solutions where technical findings are combined with legal arguments.

Conclusion

Vehicle depreciation compensation is a technical area that requires proper document and time management. You can make a preliminary assessment with a quick calculation at home; however, in legal processes, the expert report and institutional evidence management are decisive. Acting with attention to the statute of limitations periods prevents the claim from becoming time-barred.

Disclaimer

This text is for general informational purposes; it does not replace personalized legal counsel. Official legislation and current fee/rate percentages may change over time. For definite information and strategy, we recommend seeking professional legal support from an attorney who reviews your documents.