How to Apply for Leniency (active Cooperation) with the Turkish Competition Authority, Step‑by‑step Guide

Understanding how to apply for leniency in Turkey can mean the difference between full immunity from administrative fines and exposure to penalties that may reach up to 10 per cent of annual gross revenue. The Regulation on Active Cooperation for Detecting Cartels (the “Leniency Regulation”), published in the Official Gazette on 16 December 2023 (No. 31542), governs the process administered by the Turkish Competition Authority (Rekabet Kurumu). This guide walks in‑house counsel, compliance officers and company leadership through every stage of the leniency application process in Turkey, from the first internal decision to preserve evidence through to the Board’s final ruling, incorporating the practical clarifications that have emerged in 2024–2026 enforcement practice.

Whether your company is responding to a dawn‑raid, conducting an internal investigation, or weighing pre‑emptive disclosure, the procedural steps, document checklist, timeline and cost estimates below provide the tactical framework you need before engaging competition counsel.

Overview of the Leniency Process and Who It Applies To

Turkey’s leniency mechanism offers undertakings, as well as their managers and employees, the opportunity to receive full immunity or a significant reduction in administrative fines in exchange for voluntarily disclosing a cartel and actively cooperating with the Rekabet Kurumu throughout its investigation. The legal basis is Article 4 of Law No. 4054 on the Protection of Competition, supplemented by the Leniency Regulation and the accompanying Guidelines published by the Authority.

The system operates on a “first‑in” priority principle: the first applicant to provide sufficient evidence before the TCA has enough information to launch a full investigation may qualify for complete immunity. Subsequent applicants may still receive graduated fine reductions, provided they supply evidence of significant added value. Because timing is decisive, companies should treat a leniency decision as urgent the moment a cartel risk is identified, whether through a dawn‑raid, an internal audit finding, or a whistleblower report.

A leniency application can be made at any point before the TCA formally serves the investigation report on the parties. In practice, however, the earlier the application is filed, the stronger the applicant’s position. The Rekabet Kurumu accepts applications directly or, where available, through the e‑Government (e‑Devlet) portal. Companies operating in Turkey, including foreign subsidiaries and non‑Turkish parent entities, may apply, provided they can demonstrate a connection to the cartel conduct and satisfy the cooperation requirements set out in the Regulation.

Leniency Eligibility and Prerequisites in Turkey

Who can apply, undertakings versus natural persons

Leniency eligibility in Turkey extends to several categories of applicant. Under the Active Cooperation Regulation, the following may file an application with the Rekabet Kurumu:

• Undertakings. Any legal entity that participated in the cartel, domestic or foreign‑incorporated, may apply. Foreign subsidiaries and non‑Turkish parent companies are eligible provided they can establish their role in the anticompetitive conduct and authorise legal representation in Turkey.
• Managers and employees. Natural persons who participated in or had knowledge of the cartel may apply independently. The Regulation provides that managers and employees of an applicant undertaking also benefit from the immunity or reduction granted to the undertaking itself, provided they cooperate fully.
• Third parties. In specified circumstances, parties that facilitated or were otherwise connected to the cartel may be eligible. Industry observers note that the 2023 Regulation and subsequent TCA guidance have broadened the practical scope for third‑party applications, aligning Turkish practice more closely with OECD recommendations.

Critically, each application must be independent, it cannot be filed jointly with or on behalf of another undertaking. The applicant must act on its own initiative and must not have coerced other undertakings to participate in the cartel.

Disqualifying conduct

An applicant will lose eligibility, or have immunity revoked after it is granted, if any of the following apply:

• Continued participation. The applicant must cease involvement in the cartel immediately upon application (except where the Rekabet Kurumu instructs otherwise to preserve the integrity of the investigation).
• Obstruction or concealment. Destroying, falsifying or concealing evidence, or otherwise obstructing the TCA’s investigation, disqualifies the applicant.
• Coercion. If the applicant coerced others into joining or remaining in the cartel, full immunity is generally unavailable, although a fine reduction may still be considered.
• Incomplete cooperation. Failing to provide continuous, complete and timely cooperation throughout the investigation, including making witnesses available and producing all relevant documents, may result in revocation of the leniency benefit.

Step‑by‑Step Leniency Application Process in Turkey

The leniency application process in Turkey follows a structured sequence. The table below summarises each step, the responsible party and the typical duration, followed by detailed guidance on each stage.

Step 1, Preserve evidence and impose a legal hold

The moment a cartel risk is identified, whether through a dawn‑raid, an internal investigation, a whistleblower tip or external intelligence, the company must immediately preserve all potentially relevant evidence. This means issuing a formal legal hold notice to all custodians (employees whose devices or files may contain relevant data), suspending routine document‑destruction schedules and instructing IT to image or quarantine relevant servers, email accounts and messaging platforms. Metadata integrity is essential: the TCA places significant weight on contemporaneous records, and evidence that has been altered or selectively deleted will undermine the application.

Step 2, Assess eligibility and engage competition counsel

Before contacting the Rekabet Kurumu, the general counsel and, where possible, external Turkish competition counsel should conduct a rapid eligibility assessment. Key questions include whether the company was the ringleader or coerced others (which affects immunity eligibility), whether the cartel is already under formal investigation, and whether another participant may have already applied. This assessment typically takes 24–72 hours and determines whether the company should pursue full immunity (as first applicant), request a marker to reserve its position, or apply for a fine reduction as a subsequent cooperating party.

Step 3, Prepare and submit the leniency application to the Rekabet Kurumu

The application is submitted directly to the Rekabet Kurumu. Where the applicant does not yet have a complete evidence package, it may request a marker, a preliminary filing that reserves the applicant’s place in the priority queue while the full dossier is being assembled. The marker should include a summary of the cartel (participants, affected markets, the applicant’s role), an indication of the evidence to follow, and the applicant’s commitment to cooperate fully.

A full application includes the signed application letter, all available contemporaneous evidence, a chronology, witness lists and any supporting materials. The filing is typically made through counsel, either via sealed submission to the Authority’s registered address or through the e‑Government (e‑Devlet) portal where this channel is available. Companies should confirm the current submission route directly with the Rekabet Kurumu’s contact office, as procedural channels have been updated periodically since the 2023 Regulation entered into force.

Step 4, Receive TCA preliminary review and marker confirmation

Upon receipt of the application or marker request, the Rekabet Kurumu conducts a preliminary assessment. If a marker is granted, the applicant is given a defined period to complete the evidence package. Early indications from practitioner experience suggest this confirmation typically arrives within 3–14 days, though the Regulation does not prescribe a fixed statutory deadline for the marker response. The marker is critical: it fixes the applicant’s position in the queue, meaning a competitor who files later cannot leapfrog the marker holder for first‑applicant immunity.

Step 5, Hand over evidence, provide witness statements and cooperate on‑site

Following marker confirmation (or upon filing a full application), the applicant must deliver all substantive evidence. This includes contemporaneous documents (emails, meeting minutes, price lists, contracts), signed witness statements from employees and managers, a complete chronology of the cartel’s operation, and any digital forensic reports. The TCA may request on‑site access, follow‑up interviews with personnel, or coordination with dawn‑raid teams operating at other participants’ premises. The applicant must remain available and responsive, delays or gaps in cooperation at this stage risk downgrading or revoking the leniency benefit.

Step 6, Investigation report and possible hearing before the Board

After the evidence phase, the TCA’s case handlers prepare an investigation report. This report is served on all parties to the investigation, including the leniency applicant. The applicant may request an oral hearing before the Rekabet Kurumu Board. During this phase, the applicant’s cooperation record is evaluated against the requirements of the Active Cooperation Regulation. The duration of this phase depends on the complexity of the case and the number of parties involved; industry observers note that multi‑party cartel investigations can extend for several months.

Step 7, Receive the Board’s final decision and assess next steps

The Rekabet Kurumu Board issues a final decision granting full immunity, a specified fine reduction, or, in rare cases, rejecting the leniency application. The decision is communicated to the applicant in writing. If the application is rejected or the reduction is lower than expected, the applicant retains the right to appeal before the administrative courts. Where immunity is granted, the applicant’s cooperation obligations typically continue through any subsequent private damages litigation. Companies should maintain counsel engagement through this phase to protect against follow‑on exposure.

Documents Needed for a Leniency Application in Turkey

A well‑prepared evidence package is fundamental to a successful application. The documents needed for a leniency application can be grouped into mandatory items and supporting materials. The table below provides a leniency checklist of the core documents, together with practical notes on format and preparation.

Evidence hierarchy and privilege considerations

The Rekabet Kurumu assigns the greatest weight to contemporaneous records, documents created at the time of the cartel conduct. Witness statements are valuable supporting evidence but are generally treated as secondary to documentary proof. Digital forensic extracts (e.g., recovered deleted files, server logs) can be powerful corroboration.

A recurring tactical question concerns internal investigation reports. Sharing the full report, including legal analysis, may waive privilege. The recommended approach is to separate factual findings from privileged advice: submit the factual summary to the TCA and retain the privileged analysis under counsel’s control. Discuss the trade‑offs with experienced competition counsel before making disclosure decisions, as an incomplete submission can weaken an otherwise strong application.

Leniency Timeline in Turkey, Key Deadlines

Timing is the single most important variable in the leniency application process. The table below sets out the critical deadlines and the practical implications for businesses considering how to apply for leniency in Turkey.

The overarching principle under the Active Cooperation Regulation is that the applicant must provide information and evidence that enables the TCA to carry out a targeted investigation, or, if an investigation is already under way, that provides significant added value. The leniency timeline in Turkey is therefore compressed at the front end: every day of delay between identifying a cartel risk and filing the application erodes the applicant’s position.

Costs of Leniency in Turkey, Fees and Practical Expenses

The Rekabet Kurumu does not charge an application fee for leniency filings. The principal costs are professional and operational. The estimates below are indicative and will vary with case complexity.

Where leniency results in a reduced fine, companies should consult tax advisors on the financial reporting and corporate tax treatment of both the original fine exposure and any reduction granted. These implications vary by corporate structure and jurisdiction of incorporation.

What Changed in 2026, Active Cooperation Regulation Updates

The current framework rests on the Active Cooperation Regulation published in the Official Gazette on 16 December 2023 (No. 31542), which replaced the previous 2009 regulation. The 2023 instrument introduced several structural changes that remain directly relevant to businesses applying for leniency in 2026:

• Formalised marker procedure. The Regulation codified the marker mechanism, giving applicants a defined pathway to reserve their priority position while assembling full evidence. Practitioner commentary from leading Turkish firms confirmed that this reduced uncertainty around timing that had existed under the prior regime.
• Explicit deadlines for evidence completion. The Regulation introduced clearer expectations for the timeframe within which a marker‑holding applicant must deliver substantive evidence, reinforcing the TCA’s emphasis on speed.
• Expanded applicant scope. The 2023 text clarified eligibility for managers, employees and, in defined circumstances, third parties, a development aligned with OECD and ICN recommendations on broadening leniency access.
• Strengthened cooperation obligations. The Regulation placed greater emphasis on continuous, proactive cooperation, with explicit consequences (including revocation) for applicants that obstruct the investigation or provide incomplete information.

Since the Regulation’s entry into force, the Rekabet Kurumu has also published draft Leniency Guidelines for public consultation and has issued Board decisions that further clarify the practical application of these rules. The likely practical effect for businesses in 2026 is that the TCA expects faster, more comprehensive initial disclosures and will hold applicants to stricter standards of ongoing cooperation than was typical under the 2009 framework.

Common Pitfalls in the Turkish Leniency Process and How to Avoid Them

• Delaying the marker submission. Every hour of delay risks another cartel participant filing first. Appoint a response team in advance and have template marker documents prepared as part of standing compliance protocols.
• Failing to preserve metadata. The TCA places high evidentiary value on original metadata (timestamps, sender/recipient fields, edit histories). Instruct IT to image, not just copy, relevant devices and servers.
• Continuing infringing conduct after application. The Regulation requires immediate cessation of cartel participation unless the TCA specifically instructs otherwise. Even informal market contacts with co‑cartelists can jeopardise the entire application.
• Over‑disclosing privileged material. Submitting a full internal investigation report, including privileged legal analysis, may waive legal professional privilege. Separate facts from legal advice and share only the factual layer with the TCA.
• Poor witness preparation. Witness statements that are vague, inconsistent with documentary evidence, or clearly drafted without reference to underlying records undermine credibility. Work with counsel to prepare witnesses thoroughly using the contemporaneous documents.
• Incomplete translations. Submitting evidence in a foreign language without certified Turkish translations causes processing delays and signals a lack of commitment to cooperation. Budget for translation from day one.

Conclusion

Knowing how to apply for leniency in Turkey, and acting on that knowledge quickly, is the most effective way for a cartel participant to limit financial and reputational exposure. The process demands rapid internal decision‑making, meticulous evidence preservation, and sustained cooperation with the Rekabet Kurumu from the moment of first contact through to the Board’s final decision. The Active Cooperation Regulation published on 16 December 2023 has brought greater procedural clarity, but it has also raised the bar for what the TCA expects from applicants. Companies that invest in advance compliance planning, pre‑drafted marker templates, standing legal hold protocols and pre‑vetted counsel relationships, will be best positioned to secure the maximum benefit if a leniency decision becomes necessary.

Last reviewed: 15 June 2026

Sources

1. Rekabet Kurumu, Leniency Applications
2. Esin Attorney Partnership, Turkish Competition Authority’s Leniency Regulation Is Updated and Entered into Force
3. Paksoy, New Turkish Leniency Regulation Enters into Force
4. ELIG Gürkaynak, Leniency Mechanism in Turkish Competition Law
5. ICLG, Cartels & Leniency Laws and Regulations: Turkey
6. International Competition Network, Anti‑Cartel Enforcement Template: Turkey
7. OECD, Alternatives to Leniency Programmes: Contribution from Türkiye
8. Rekabet Kurumu, Draft Leniency Guidelines
9. Lexology, Cartel Immunity and Leniency Programmes in Türkiye