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ARTICLE · 01 JULY 2026

Constitutional Court Curbs The Personal Data Protection Board’s Authority: Law Takes Precedence Over Guidelines

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The Turkish Constitutional Court has ruled that the Personal Data Protection Board violated the principle of legality by imposing administrative fines based on its own interpretation rather than clear legal grounds. This landmark decision requires companies to fundamentally reassess how they process data from publicly available sources under Article 5 of the Personal Data Protection Law.

TurkeyPrivacy

The Constitutional Court held that the principle of legality was violated in the administrative fine imposed on an insurance company by the Personal Data Protection Board. The Court clarified that the Board cannot rely on its interpretation of the “purpose of making data public” as a basis for sanctions without a clear legal ground. The decision indicates that companies processing data from publicly available sources should reassess their processes, inventories and ongoing investigation files under Article 5 of the Personal Data Protection Law.

Introduction

The Constitutional Court (“TCC”) unanimously held that an administrative fine imposed on an insurance company by the Personal Data Protection Board (“Board”) violated the principle of legality in crimes and punishments, as guaranteed under Article 38 of the Constitution. In terms of both its scope and implications, this decision is of significant importance for the Board’s practices.

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