Leniency vs Settlement in Turkey (2026): Which Should Your Company Use After a TCA Investigation?

When the Turkish Competition Authority (TCA) opens a formal investigation into your company, or worse, executes a dawn-raid, the general counsel’s most consequential early decision is whether to pursue leniency or settlement. The choice between leniency vs settlement in Turkey determines the size of the fine your company will ultimately pay, the speed of resolution, the admissions on record, and whether private follow-on damages claims become easier to bring. The 2025–2026 regulatory cycle, specifically the TCA’s Fines Guidelines published on 21 February 2025, the updated Leniency Regulation that entered into force in late 2023, and the Constitutional Court’s 11 December 2025 ruling on settlement reviewability, has materially changed the calculus, making older guidance unreliable for decisions taken today.

The short answer: choose leniency if you hold primary evidence of a cartel and can be the first (or an early) applicant, the potential for full immunity is unmatched. Choose settlement if the TCA already has strong evidence, you cannot secure an advantageous leniency ranking, and you need faster closure with a predictable discount. The rest of this article gives you the dimension-by-dimension framework to make that call with confidence.

Option A: The Leniency Programme in Turkey

Leniency delivers the largest possible fine reduction, up to full immunity, but only for cartel conduct and only if you move first. The TCA’s leniency programme (formally the “active cooperation” mechanism under Article 16 of Law No. 4054 and the New Leniency Regulation) allows undertakings involved in cartels to receive immunity from, or significant reductions in, administrative fines in exchange for evidence and sustained cooperation throughout the investigation.

What Leniency Delivers: Immunity and Discount Tiers

Under the New Leniency Regulation, the benefits are structured in a clear hierarchy:

• First applicant, full immunity. The undertaking that is the first to submit evidence enabling the TCA to launch an investigation (or, if an investigation has already been launched, evidence that provides significant added value) may receive complete immunity from administrative fines.
• Second applicant, fine reduction of up to one-third to one-half. Subsequent cooperating undertakings receive progressively smaller reductions, calibrated by the added value of their evidence relative to what the TCA already holds.
• Third and later applicants, fine reduction of up to one-quarter to one-third. The marginal benefit diminishes with each additional applicant, but meaningful discounts remain available.

Eligibility is limited to cartel conduct, horizontal agreements on prices, output, market allocation, or bid-rigging. Vertical restraints and abuse-of-dominance cases do not qualify for the leniency programme in Turkey.

When to Apply: Dawn-Raid Timing and First-Mover Safety

The optimal moment to apply for leniency is before or during a dawn-raid, not after. Once TCA inspectors arrive at your premises, the window for first-applicant status narrows rapidly. Practical steps during a competition investigation in Turkey include:

• Instruct external antitrust counsel immediately upon learning of a raid, do not wait for the inspection to conclude.
• Submit a marker application to the TCA to secure your place in the queue while the full evidence package is being assembled.
• Preserve all internal documents, emails, messaging records, meeting notes, that may constitute evidence of the cartel. Destruction of evidence disqualifies the applicant.

A company can submit a leniency application and later also pursue settlement (these are not formally mutually exclusive in all circumstances), but the practical and strategic interactions are complex and must be assessed case-by-case. The TCA Fines Guidelines address the interaction of discounts where both routes are used simultaneously.

Practical Risks and Evidence Obligations

Leniency demands full, continuous, and genuine cooperation. The applicant must disclose all evidence in its possession, make employees available for interviews, and refrain from destroying or concealing documents. Failure to cooperate at any stage can result in revocation of conditional immunity. Attorney-client privilege protections under Turkish law are narrow, in-house counsel communications may not enjoy the same protection as external counsel communications, and companies should assume that most internal business documents are discoverable.

Option B: The Settlement Procedure in Turkey

Settlement offers a faster, more predictable resolution with a moderate fine discount, but requires an admission and carries appeal limitations that shifted significantly in December 2025. The settlement procedure under Turkish competition law allows an undertaking under investigation to negotiate the terms of a Competition Board decision, including the admitted facts and the fine, in exchange for a reduction in the final penalty.

What Settlement Delivers: Discount Structure and Faster Closure

The TCA Fines Guidelines published on 21 February 2025 formalised the settlement discount framework. The typical settlement procedure in Turkey delivers:

• A fine discount of up to 25% off the base fine that would otherwise be imposed, contingent on the scope and timing of cooperation.
• Shortened proceedings, settlement cases typically resolve faster than fully contested investigations, reducing internal compliance costs, management distraction, and legal fees.
• A negotiated statement of facts, the undertaking accepts the TCA’s characterisation of the infringement (or an agreed version), which becomes part of the final decision.

Unlike leniency, settlement is not limited to cartel cases. It can apply to horizontal agreements, vertical agreements, and abuse-of-dominance investigations, giving it a broader scope of eligibility.

Eligibility and Procedure: The Added-Value Test

Settlement becomes available only after the TCA has formally initiated an investigation. The undertaking must apply (or accept the TCA’s invitation) and demonstrate willingness to admit the infringement and cooperate. The added-value criterion plays a role: if the undertaking provides evidence or admissions that materially advance the TCA’s case beyond what it already holds, the resulting discount may be higher within the permitted range. The Fines Guidelines codify how this added-value assessment interacts with any concurrent leniency application.

Practical Risks: Appeal, Admission, and Follow-On Litigation

The most significant risk shift in 2025–2026 concerns judicial review of settlement decisions. The Constitutional Court’s decision of 11 December 2025 addressed whether undertakings that accept settlement can subsequently challenge the Competition Board’s decision before the administrative courts. Early indications suggest that the ruling narrows, but does not eliminate, the scope of judicial review available to settling parties, creating a tension between the certainty of settlement and the loss of appellate options.

Additionally, the admission of facts in a settlement decision can be used as evidence in private follow-on damages actions. Companies operating in sectors with significant customer or supplier litigation risk should weigh this exposure carefully before accepting settlement terms.

Leniency vs Settlement in Turkey: Side-by-Side Comparison

Choose leniency when you have first-mover evidence of a cartel; choose settlement when speed and predictability outweigh the size of the discount. The following table maps the ten critical decision dimensions.

Illustrative Fines Scenarios (Hypothetical)

The following three scenarios apply TCA Fines Guidelines logic to a hypothetical cartel with a base fine of TRY 100 million. These are illustrative only, actual outcomes depend on case-specific factors assessed by the Competition Board.

The critical insight: a third-ranking leniency applicant may receive a comparable or even smaller discount than a settling party, making leniency ranking position the decisive variable. Where first-applicant status is unavailable, settlement frequently delivers a better risk-adjusted outcome.

Dimension-by-Dimension Analysis: Leniency vs Settlement in Turkey

Financial Impact and Fines Calculation

Leniency offers the widest discount range, but only first-applicant status consistently outperforms settlement on a pure cost basis. The TCA Fines Guidelines (21 February 2025) codified how discounts are calculated and how they interact when a company has applied for both leniency and settlement.

For companies evaluating how to mitigate antitrust fines, the arithmetic is stark: first-applicant leniency eliminates the fine entirely. Every other position requires careful comparison against the settlement discount.

Timing and Operational Cost

Settlement is almost always faster; leniency demands more sustained internal resources.

• Leniency: The cooperation obligation runs for the entire duration of the investigation, often 12 to 24 months. Internal costs include document review, employee interviews, external counsel coordination, and ongoing compliance monitoring. Legal fees for a fully contested leniency process in a multi-party cartel investigation can be substantial.
• Settlement: Once the TCA and the undertaking agree on the statement of facts and the fine, the decisional phase is truncated. Industry observers expect settlement cases to conclude several months faster than fully investigated matters, reducing both legal fees and management distraction.

Liability and Criminal Exposure

Neither route provides a complete shield against criminal liability, but leniency offers stronger administrative protection.

• Leniency: Full immunity eliminates the administrative fine, but Turkish law does not formally extend leniency to shield individuals from potential criminal prosecution under separate statutes (e.g., bid-rigging under the Turkish Criminal Code). In practice, the TCA’s leniency decision is a powerful mitigating factor.
• Settlement: Provides a fine reduction only. The admission of infringement in the settlement text could, in theory, strengthen any separate criminal case. Companies with exposed individuals should weigh this carefully.

Evidence, Added Value, and Burden of Proof

The added-value criterion is the gateway to maximising benefits under both routes. The TCA assesses whether the evidence or admissions provided by the applicant materially advance the investigation beyond the authority’s existing knowledge. Under leniency, evidence that enables the TCA to prove a cartel it could not otherwise demonstrate carries the highest value. Under settlement, admissions that save investigative resources and confirm the TCA’s theory of harm enhance the discount. Companies should conduct a thorough internal evidence audit before deciding which route to pursue, the quality and exclusivity of available evidence is often the single most important variable in the leniency vs settlement decision.

Enforceability and Appeal Risk

The December 2025 Constitutional Court ruling changed the appeal landscape for settlement decisions. Before this ruling, there was debate over whether an undertaking that voluntarily accepted settlement could subsequently challenge the Board’s decision in full. The 11 December 2025 Constitutional Court decision clarified the scope of judicial review available to settling parties, the likely practical effect is that companies accepting settlement now face a narrower appellate corridor than those whose leniency applications are denied. A denied leniency applicant retains full access to administrative court review of both the underlying infringement finding and the fine calculation.

What Changed in 2025–2026: The Real 2026 Hook

Four developments in 2025–2026 fundamentally alter the leniency vs settlement calculus in Turkey.

• TCA Fines Guidelines (21 February 2025). For the first time, the TCA published comprehensive guidance on how base fines are calculated, how aggravating and mitigating factors apply, and, critically, how leniency and settlement discounts interact when both are pursued simultaneously. This codification increased predictability but also revealed that combined discounts are not simply additive.
• New Leniency Regulation (entered into force 2023–2024). The updated regulation refined the added-value criterion, formalised the marker system, and strengthened confidentiality protections for leniency statements. The practical consequence is a more structured, and more demanding, process for applicants.
• Güres decision (2025). This Competition Board decision provided precedent on how the TCA evaluates the added value of evidence in the context of overlapping leniency and settlement applications. Industry observers expect this decision to anchor future practice on evidence valuation.
• Constitutional Court ruling (11 December 2025). By addressing settlement reviewability, this ruling reduced the appellate safety net for companies choosing the settlement route. The practical consequence: settlement is now a more final, and therefore higher-stakes, commitment.

Taken together, these changes favour leniency for first movers with strong evidence and increase the risk premium attached to settlement, particularly for companies that may later wish to challenge the infringement finding.

Decision Framework: When to Choose Leniency vs Settlement

Run this five-question triage in the first hours after you learn of a TCA investigation.

Quick Triage Checklist (15 Minutes)

1. Is the conduct a cartel (price-fixing, bid-rigging, market allocation, output limitation)? If no → leniency is unavailable; settlement is your primary route.
2. Do you hold primary documentary evidence of the cartel (emails, meeting records, pricing communications)? If yes → leniency has strong potential.
3. Are you likely the first undertaking to apply? If yes → pursue leniency immediately for full immunity. If no → assess your likely ranking.
4. Is criminal exposure for individuals a material concern? If yes → leniency’s administrative immunity is more protective; consider personal liability implications of settlement admissions.
5. Is speed of resolution the dominant commercial priority (e.g., pending M&A, regulatory approval, refinancing)? If yes → settlement’s faster timeline may outweigh a smaller discount.

Choose Leniency When:

• The conduct is a cartel and you can secure first-applicant or second-applicant status
• You possess primary evidence the TCA does not yet hold
• Full immunity or a large fine reduction justifies the extended cooperation burden
• Individuals face potential criminal exposure and administrative immunity is strategically valuable
• You are willing to commit to full, sustained cooperation for the duration of the investigation

Choose Settlement When:

• The conduct is not a cartel (vertical restraints, abuse of dominance), leniency is unavailable
• First- and second-applicant leniency positions are already taken
• The TCA already holds strong evidence and your additional evidence adds limited incremental value
• Speed of resolution is the overriding commercial priority
• You have assessed and accepted the narrower judicial review corridor following the December 2025 Constitutional Court ruling
• Follow-on private damages exposure is manageable or the admission of facts is commercially tolerable

Decision Matrix

When to Engage a Lawyer for This Decision

This is not a decision to make without specialist competition counsel. The stakes, fines that can reach 10% of Turkish turnover, criminal referral risk, and permanent admissions on the public record, demand expert guidance from the first hour. Engage an antitrust lawyer immediately in any of the following situations:

• A TCA dawn-raid is under way or imminent. Counsel should be on-site or available by phone within the first hour to advise on document handling, employee interviews, and whether to file an immediate leniency marker.
• You discover internal evidence of cartel conduct (e.g., through an internal audit or whistleblower report) and must decide whether to self-report before the TCA acts.
• The TCA has formally notified you of an investigation and invited or indicated openness to settlement discussions, you need counsel to assess your leniency ranking prospects before responding.
• Your company is a foreign parent of a Turkish subsidiary under investigation, cross-border privilege, disclosure obligations, and multi-jurisdictional leniency coordination require specialist advice.
• Individual employees or directors face potential criminal exposure (particularly in bid-rigging cases) and you need to understand how the choice between leniency and settlement affects their personal liability.

Within 48 to 72 hours, experienced competition counsel should deliver: (a) a preliminary evidence audit and leniency ranking assessment; (b) a written recommendation on leniency vs settlement with projected discount ranges; and (c) a document preservation and privilege protocol for the investigation period.

Conclusion

The choice between leniency vs settlement in Turkey is not abstract, it is a high-stakes, time-pressured decision with permanent consequences. The 2025–2026 regulatory changes, particularly the TCA Fines Guidelines and the Constitutional Court’s December 2025 ruling on settlement reviewability, have sharpened the trade-offs. First-mover leniency applicants with strong cartel evidence should pursue immunity without hesitation. Companies facing non-cartel investigations, or those arriving late to the leniency queue, will often find settlement the more rational path. In every case, the decision requires a rapid evidence audit, a realistic assessment of leniency ranking, and experienced Turkish antitrust counsel who can execute within the narrow windows the TCA process allows.

The framework above, triage checklist, comparison table, and decision matrix, gives general counsel a structured starting point, but the final call on leniency vs settlement in Turkey must be made with full knowledge of the specific facts and specialist legal advice.

Sources

1. Turkish Competition Authority, Guidelines on Fines (21 Feb 2025) (via Esin Attorney Partnership summary)
2. Paksoy, New Turkish Leniency Regulation Briefing
3. ELIG Gürkaynak, Cartel Leniency in Turkey Overview
4. Lexology, Turkey Cartels and Leniency Comparative Notes
5. ICLG / Actecon, Cartels and Leniency 2025 (18th Edition)
6. OECD, Alternatives to Leniency Programmes (2023)
7. Turkish Competition Authority (TCA) Official Website