The power to conduct on-site inspections is one of the leading tools used in detecting whether the Act no 4054 on the Protection of Competition (Act no 4054) was violated. The productive use of this power is of utmost importance in establishing effective competition.

Within the scope of the power to conduct on-site inspections, which is based on the Act no 4054, Competition Authority (Authority) experts can examine undertakings’ books as well as all types of data and documents they keep on physical or electronic media and in information systems, take copies and physical samples, and request written or oral statements from employees of the undertakings on certain issues. Employees of the undertakings are obliged to provide copies of information, documents, books and other instruments requested.

Inspections on the premises are conducted meticulously by the Authority using state-of-the-art equipment. The inspection covers only work-related elements; personal or private data are in no way accessed and are kept strictly outside the scope of the inspection.

From the moment the on-site inspection begins, employees of the undertaking must not, under any circumstances, delete any data from any device that they use containing electronic data, such as mobile phones or computers. Otherwise, this can be easily detected by the Authority experts and undertakings may face administrative fines up to 0.5% of their turnover within the scope of prevention and/or obstruction of on-site inspections.

In fact, in the on-site inspection conducted at Coca-Cola Satış ve Dağıtım AŞ (COCA-COLA) on 07.10.2025, Authority experts detected that a manager of the undertaking deleted data after the beginning of the on-site inspection, and COCA-COLA was imposed an administrative fine of 282,416,376.34 TL, at 0.5% of its gross revenues in 2024, with the decision taken by the Competition Board on 20.11.2025, which ruled that the on-site inspection was prevented and/or obstructed.