Abuse of Dominance in Turkey 2026: Triggers, TCA Process and How Businesses Should Respond

Abuse of dominance Turkey enforcement has entered a more assertive phase in 2026, and any business with meaningful market power operating in the Turkish market needs to understand what that means in practice. The Turkish Competition Authority (Rekabet Kurumu, the TCA) has broadened its investigatory focus, sharpened its procedural tools and turned its attention increasingly toward digital and platform conduct. For in-house counsel, foreign investors and M&A teams, the practical questions are no longer academic: what triggers a TCA abuse investigation, what happens once one begins, and how should a company respond in the critical first hours and weeks?

This guide answers those questions with a jurisdictional test, a red-flag list, forensic checklists, a decision framework and a clear position on when to contest, negotiate or settle.

Who this is for: in-house counsel, foreign investors, M&A teams and competition counsel assessing risk or responding to a TCA abuse-of-dominance investigation. What this guide delivers: the legal test, ten concrete triggers, an evidence checklist, a 0–72 hour response protocol, a 30-day plan, a side-by-side decision table comparing your strategic options, likely remedies and fines, and a practical FAQ. For the wider penalty picture, read our Competition fines in Turkey, essential guide.

Legal framework for abuse of dominance in Turkey

The foundation of abuse of dominance Turkey law is Law No. 4054 on the Protection of Competition. The statute prohibits the abuse, by one or more undertakings, individually or jointly, of a dominant position in a relevant product or geographic market. Two things must be established: first, that the undertaking is dominant; and second, that its conduct constitutes an abuse. Dominance alone is not unlawful. Turkish competition law penalises the misuse of market power, not its mere possession.

Law No. 4054, the key provisions

Law No. 4054 sets out the definition of a dominant position, the prohibition on abusing it, and the enforcement architecture, the powers of the TCA and its decision-making Competition Board. The same statute governs the fine framework, giving the TCA authority to impose administrative monetary penalties calculated as a percentage of an undertaking’s annual turnover. Because the consolidated text and any amendments are published in the Official Gazette and referenced on the TCA site, businesses and their counsel should always work from the primary text rather than secondary summaries when assessing exposure.

The dominance test in Turkey

There is no single market-share number that automatically makes an undertaking dominant. The TCA applies a contextual, evidence-based assessment. In practice, a high market share can raise questions worth examining, but share is only the starting point. The dominance test in Turkey weighs a cluster of indicators:

• Market share and its stability. A high, durable share sustained over time carries more weight than a fluctuating one.
• Barriers to entry and expansion. Regulatory hurdles, sunk costs, network effects and access to essential inputs all strengthen a finding of dominance.
• Countervailing buyer power. Where customers are large and can credibly switch or self-supply, dominance is harder to establish.
• Vertical integration and control of infrastructure. Control over a distribution channel, data set or platform that rivals need can confer market power beyond what share alone suggests.

Getting the market definition right is often the single most consequential step in any defence, because it determines the denominator against which share, and therefore dominance, is measured. Companies preparing for or responding to scrutiny should invest early in rigorous market-definition analysis and dominance test evidence.

Types of abuse, exclusionary and exploitative conduct

Abuse of a dominant position in Turkey falls into two broad families. Exclusionary conduct targets rivals and forecloses competition: predatory pricing, margin squeeze, exclusivity arrangements, loyalty rebates, tying and refusal to deal in Turkey are all classic examples. Exploitative conduct directly harms customers or suppliers: excessive pricing, unfair trading terms and discriminatory pricing between comparable counterparties. The TCA has pursued both, and in recent years the exclusionary category, especially in digital markets, is where enforcement energy has been most visible.

What triggers an abuse of dominance Turkey investigation, concrete red flags

Investigations rarely begin at random. They are triggered by identifiable events and patterns. Understanding the triggers lets a business self-assess its exposure before a complaint lands. Below are ten evidence-based triggers, each with the kind of evidence the TCA looks for and a rough likelihood indicator.

Formal referrals and complaints

A common starting point for an abuse of dominance Turkey probe is a complaint from a competitor, customer or distributor. Ex-partners and terminated distributors are a particularly fertile source, because they hold internal documents and can testify to conduct that outsiders cannot see.

• Competitor complaint (Likelihood: High). A rival alleging foreclosure or predatory pricing. Evidence sought: pricing below cost, exclusivity terms, sudden loss of shelf space or access.
• Customer or distributor complaint (Likelihood: High). Allegations of discriminatory terms or refusal to supply. Evidence sought: differential pricing schedules, correspondence refusing supply, rebate conditions.
• Whistleblower from a former partner (Likelihood: Medium). Internal emails or contracts evidencing exclusivity or coordinated foreclosure.

Market signals and conduct-based red flags

The TCA also acts on patterns it detects itself, through market monitoring, sector inquiries and evidence surfaced in unrelated cases. These conduct-based red flags are where compliance teams should focus internal audits.

• Sustained below-cost pricing by a dominant firm (Likelihood: High). Evidence: cost-accounting data, pricing models, internal justifications for loss-making campaigns.
• Loyalty or fidelity rebates conditioned on exclusivity (Likelihood: High). Evidence: rebate calculation spreadsheets, target-based discount agreements.
• Margin squeeze in vertically integrated markets (Likelihood: Medium). Evidence: wholesale vs retail pricing spreads, internal transfer pricing.
• Refusal to deal or refusal to grant access to an essential input (Likelihood: Medium). Evidence: correspondence declining supply, internal decisions to cut off a counterparty. Refusal to deal in Turkey is scrutinised closely where the input is genuinely indispensable to competition downstream.
• Tying and bundling (Likelihood: Medium). Evidence: product-linkage terms, contractual conditions requiring purchase of a second product.
• Discriminatory pricing between comparable customers (Likelihood: Medium). Evidence: price lists showing unexplained differentials for similar buyers.
• Long-term exclusivity clauses that foreclose the market (Likelihood: Medium). Evidence: distribution and supply agreements with lengthy tie-ins.

Data and platform triggers, the current emphasis

A distinctive feature of recent TCA enforcement is its sharpened focus on digital markets. Platform self-preferencing, ranking one’s own products or services above rivals, is a leading concern, echoing comparative enforcement trends discussed by the OECD and the European Commission. Evidence the TCA seeks here includes ranking-algorithm documentation, records of ranking adjustments, data-access policies and internal decisions on how third parties appear on a platform. For any undertaking operating a marketplace, app store, search or comparison service, algorithmic conduct is now a front-line risk. Companies in this space should assume that platform logs and algorithm change histories may be discoverable and should preserve them accordingly.

Investigative powers and process, what to expect from the TCA

Once a trigger is acted upon, the TCA deploys substantial investigatory powers under Law No. 4054. Knowing the sequence and your rights at each stage is essential to responding well.

Dawn raids and on-site inspections

The TCA has the power to conduct unannounced on-site inspections, dawn raids, at company premises. Investigators may examine and copy books, records and electronic data, request oral explanations on the spot, and take copies of documents relevant to the inquiry. Companies have rights during a raid, including the right to have counsel present, but the inspection generally proceeds while counsel travels to the site. Obstruction, including deleting data or refusing access, is itself sanctionable and materially worsens a company’s position. The single most damaging mistake a company can make is to interfere with, conceal or destroy material during or after a raid.

Information requests and interim measures

Outside of raids, the TCA issues formal written information requests with binding deadlines. Failure to respond accurately and on time can attract penalties. In appropriate cases the TCA may also impose interim measures to prevent serious and irreparable harm to competition while the investigation runs, an important consideration, because such measures can constrain a business well before any final decision.

The TCA timeline: from preliminary probe to Board decision and appeal

The process moves through recognisable stages:

1. Preliminary inquiry. The TCA assesses whether the allegations warrant a full investigation. This phase may involve information requests and, sometimes, a dawn raid.
2. Formal investigation. If opened by the Board, the investigation involves detailed fact-finding, written submissions, access to the file, and the opportunity to respond to the investigation report.
3. Oral hearing (on request). Parties may request an oral hearing before the Board.
4. Board decision. The Competition Board issues a reasoned decision, infringement or no infringement, and imposes fines and remedies where applicable.
5. Judicial appeal. The Board’s decision may be challenged before the administrative courts, with the Council of State (Danıştay) as the apex administrative jurisdiction.

For a tactical, step-by-step protocol tailored to the raid itself, a dedicated dawn-raid response checklist is a valuable companion resource.

Evidence and forensic checklist, what companies must preserve and produce

In an abuse of dominance Turkey case, the outcome frequently turns on documents and data. The moment a company anticipates or receives notice of a TCA inquiry, a litigation hold should be triggered. What follows is a practical forensic checklist.

Document and data preservation checklist

• Email and messaging. Preserve mailboxes of commercial, pricing, sales and senior management personnel, including instant-messaging channels used for business.
• Pricing data. Retain price lists, cost-accounting records, margin analyses and any models used to set prices, especially anything justifying discounts or promotional pricing.
• Rebate and discount records. Rebate calculation spreadsheets, target agreements, and terms conditioning discounts on exclusivity or volume.
• Contracts. Distribution, supply, exclusivity and tying agreements, including drafts and negotiation correspondence.
• Platform and algorithm logs. Ranking algorithms, records of ranking or parameter changes, data-access policies, and A/B testing records for platform businesses.
• Board and strategy materials. Minutes, presentations and internal strategy documents discussing competitors, market share or responses to entry.

Sample eDiscovery search terms should capture pricing tables, rebate spreadsheets, promotional agreements and internal discussion of competitors. For each dataset, follow proper forensic procedure: hash files at collection, maintain a documented chain of custody, and image devices rather than working on live originals.

Economists and market studies

Because dominance and abuse both hinge on economic analysis, a company should engage economic expertise early. Prepare market-definition studies, share calculations, cost analyses (to rebut predation or margin-squeeze theories) and evidence of countervailing buyer power or low entry barriers. A well-constructed economic rebuttal is often the most effective way to defeat a dominance finding at its root, and the same evidence supports building a defence around market definition and the dominance test.

What not to do, common preservation failures

• Do not delete anything. Suspend all auto-deletion policies for relevant custodians immediately.
• Do not create new “explanatory” documents. Post-hoc memos rationalising conduct are frequently read as consciousness of exposure.
• Do not discuss the matter on unmonitored channels. Route all case communications through counsel to help protect privilege.
• Do not let non-lawyers manage the response. Preservation and communication decisions carry legal consequences.

Preservation notice, sample language: “You are receiving this notice because you may hold information relevant to a competition matter involving the Company. Effective immediately, you must preserve all documents, emails, messages, spreadsheets and data relating to [pricing / rebates / the relevant product]. Do not delete, alter or move any such material. Automatic deletion is suspended for your accounts. Direct any questions only to [named counsel]. This notice is confidential.”

Response options, immediate steps and strategic decision points

How a company acts in the first days often determines the trajectory of the entire case. This section sets out the immediate protocol, the short-term tactical steps and the three strategic routes, with a clear recommendation on how to choose between them.

Immediate 0–72 hour checklist

1. Activate the response team. Notify the General Counsel, senior management and pre-designated external competition counsel within minutes, not hours.
2. Get counsel to the premises. If it is a dawn raid, request that inspectors allow a reasonable time for counsel to arrive, while cooperating with the inspection.
3. Do not obstruct. Provide access; never delete, hide or alter anything. Obstruction is a separate, serious offence.
4. Assign a shadow. Have an employee accompany each inspector, taking contemporaneous notes of what is examined, asked and copied.
5. Log everything seized or copied. Keep a precise inventory of every document and dataset taken.
6. Control communications. Instruct staff not to volunteer explanations; questions of substance should be routed to counsel.
7. Preserve privilege. Identify and flag potentially privileged material to inspectors.
8. Trigger the litigation hold. Issue the preservation notice firm-wide to relevant custodians the same day.

Short-term tactical options (first 30 days)

1. Complete the forensic hold. Confirm all relevant data is preserved and imaged with chain-of-custody documentation.
2. Launch a privileged internal investigation. Establish the facts before the TCA does, so strategy is built on reality, not assumption.
3. Map the exposure. Assess dominance, the alleged conduct and the likely theory of harm; commission preliminary economic analysis.
4. Assess the market-definition battleground. Determine whether dominance can be credibly contested.
5. Prepare information-request responses. Build a system to respond accurately and on deadline.
6. Decide the strategic route. With the facts in hand, choose between contesting, negotiating commitments, or settling, the decision analysed below.

Strategic options: contest, negotiate or settle

There are three core strategic responses to a TCA abuse-of-dominance investigation. Turkish competition law provides mechanisms for both commitments and settlement, alongside the option of contesting. The right choice is dictated by the strength of the evidence, the survivability of the business model under remedies, and the value of speed and certainty. The table below compares them across the dimensions a General Counsel actually cares about.

Source: Law No. 4054 on the Protection of Competition and related TCA secondary legislation.

Remedies, fines and likely outcomes

Understanding the consequences focuses the strategic mind. In an abuse of dominance Turkey case, penalties and remedies operate together.

Fine calculation basics

Under Law No. 4054, administrative monetary fines for abuse of a dominant position are calculated as a percentage of the undertaking’s annual gross revenues, subject to the framework set out in the statute and the applicable TCA regulation on fines. The final figure reflects aggravating and mitigating factors, the gravity and duration of the infringement, whether the conduct was repeated, the degree of cooperation with the investigation, and whether the company took steps to end the conduct. Cooperation and early, credible engagement can meaningfully reduce exposure; obstruction and continued infringement increase it. Because the fine is turnover-based, the absolute amounts at stake for large or multinational undertakings can be very substantial.

Behavioural versus structural remedies

The TCA can impose behavioural remedies, obligations to grant access, supply on non-discriminatory terms, cease exclusivity or alter platform ranking practices, and, in appropriate cases, structural remedies affecting the shape of the business. Behavioural remedies are the more common outcome in abuse cases and are precisely what a commitments negotiation seeks to shape. The attraction of the commitments route is control: a company that engages early can help design remedies it can actually live with, rather than having them imposed.

Recent enforcement direction

The clear direction of recent TCA enforcement is toward more active intervention, particularly in digital and platform markets where self-preferencing, data access and algorithmic conduct are under scrutiny. Undertakings in these sectors should treat the risk as live and current, and calibrate compliance accordingly. For a fuller treatment of penalty ranges and calculation, consult our Competition fines in Turkey, essential guide.

Decision framework, choosing how to respond

Do not treat the three options as interchangeable. Use these rules to choose decisively:

• Choose “Contest / litigate” when the TCA’s factual or legal case is weak, strong exculpatory economic evidence exists, the business model would be destroyed by remedies, and the budget for a protracted defence is available.
• Choose “Negotiate commitments” when there is credible exposure but workable behavioural or operational remedies could preserve the core business, and speed plus reputational management matter more than outright vindication.
• Choose “Settle” when the evidence is strong against the firm, the cost and uncertainty of litigation outweigh long-term remedy costs, or immediate business continuity is critical.

A simple decision flow: Is the dominance finding genuinely contestable? → If yes and remedies would be fatal to the model, contest. → If no, can proportionate behavioural remedies preserve the business? → If yes, negotiate commitments. → If the evidence is overwhelming and certainty is paramount, settle for maximum mitigation.

Litigation and appeals, challenging a TCA decision

A Board decision is not the end of the road. Companies retain the right to judicial review.

Administrative appeal routes

Decisions of the Competition Board are subject to review by the administrative courts, with the Council of State (Danıştay) as the apex administrative jurisdiction. Appeals scrutinise both the legality of the procedure followed and the substance of the Board’s reasoning, including its market definition, dominance finding and characterisation of the conduct. Where fundamental procedural rights are implicated, an individual application to the Constitutional Court may also be relevant once ordinary remedies are exhausted.

Timing, interim relief and the evidence standard

Appeal deadlines are strict, so a decision to challenge must be taken and acted upon promptly. Courts may grant a stay of execution where the statutory conditions are met, an important tool where a fine or remedy would cause serious, hard-to-reverse harm before the appeal is resolved. Success on appeal typically depends on the quality of the economic and factual record built during the investigation, which is why disciplined evidence work from day one pays off if the matter reaches court.

Compliance and preventive measures, practical policies for firms

The cheapest abuse of dominance Turkey case is the one that never happens. Any undertaking with a strong market position should operate a competition compliance programme calibrated to that position.

Building an effective competition compliance programme

• Behavioural rules. Clear, written policies on pricing, rebates, exclusivity, dealing with rivals and, for platforms, ranking and data access.
• Dominance awareness. Train commercial teams that conduct which is lawful for a smaller player may be unlawful for a dominant one.
• Targeted training. Regular sessions for pricing, sales and senior management, with realistic Turkish scenarios.
• Document hygiene. Guidance on how commercial strategy is recorded, avoiding loose language about “crushing” or “excluding” rivals.
• Monitoring and audits. Periodic internal audits of pricing, rebate schemes and, for platforms, algorithmic conduct.
• Dawn-raid readiness. A tested protocol and trained reception and IT staff, so the 0–72 hour checklist executes smoothly under pressure.

Conclusion, acting decisively on abuse of dominance Turkey risk

Abuse of dominance Turkey enforcement rewards the prepared and punishes the reactive. The businesses that fare best are those that understand the dominance test before a complaint arrives, that run genuine compliance programmes, that preserve evidence correctly from the first hour, and that choose their strategic route, contest, negotiate or settle, deliberately rather than by default. Take a clear position: where dominance is genuinely contestable and remedies would be fatal, fight; where exposure is real but survivable remedies exist, negotiate commitments early; where the evidence is overwhelming, settle for maximum mitigation.

This guide is general information and not legal advice; the right course depends on the specific facts, and any company facing or anticipating a TCA abuse-of-dominance investigation should obtain qualified Turkish competition counsel without delay.

This article is provided for general information only and does not constitute legal advice. For advice on a specific matter, consult qualified Turkish competition counsel.

Sources

1. Turkish Competition Authority (Rekabet Kurumu), official site
2. Official Gazette (Resmî Gazete)
3. Council of State (Danıştay)
4. Constitutional Court of the Republic of Türkiye
5. OECD, Competition
6. European Commission, Competition policy