How to File an Unfair‑competition Complaint in the Czech Republic (step‑by‑step, 2026)

Understanding how to file an unfair competition complaint in the Czech Republic is essential for any business, competitor, or consumer confronting misleading practices, predatory pricing, or other conduct that distorts market competition. Czech law channels these complaints through three distinct forums, the Office for the Protection of Competition (ÚOHS), the Czech Trade Inspection Authority (CTIA / ČOI), and the civil courts, each with its own procedural rules, document requirements, and timelines. A draft amendment to the Competition Act (Act No. 143/2001 Coll.

), submitted by ÚOHS in March 2026, is poised to expand administrative remedies and introduce a new market‑intervention instrument, making the choice of forum and the framing of relief requests more strategically important than at any point in the last decade. This guide walks through the entire unfair competition complaint process in the Czech Republic, from eligibility and evidence gathering to filing, costs, and the practical implications of the 2026 reform.

Overview of the Unfair‑Competition Complaint Process and Who It Applies To

Czech unfair‑competition law rests on a general clause supplemented by a catalogue of specific prohibited practices. Act No. 143/2001 Coll. (the “Competition Act”) empowers ÚOHS to investigate and sanction anti‑competitive conduct, while the Czech Civil Code (Act No. 89/2012 Coll.) provides private‑law remedies, injunctions, corrective statements, removal of harm, and damages, enforceable through the courts. Consumer‑facing unfair commercial practices (misleading advertising, aggressive selling) fall under the jurisdiction of the Czech Trade Inspection Authority (CTIA / ČOI).

The unfair competition complaint process in the Czech Republic is open to a broad range of complainants. Business competitors, consumers, trade associations, and, in limited circumstances, public authorities may all initiate proceedings. The decision rule for choosing a forum is straightforward: if the conduct distorts competition between undertakings at a market level, file with ÚOHS; if it harms consumers through misleading or aggressive commercial practices, file with CTIA; if you seek monetary damages or a private injunction, file with the competent civil court. Parallel filings are permissible, a complainant may pursue administrative enforcement and civil damages simultaneously.

Remedies vary by forum. ÚOHS can impose cease‑and‑desist orders, behavioural or structural remedies, and substantial fines. CTIA can order corrective measures and impose administrative fines for consumer‑protection violations. Civil courts can award injunctions, removal of harm, corrective publications, and compensatory damages. The 2026 draft amendment, discussed in detail below, would add a market‑intervention power to the ÚOHS toolkit, potentially making the administrative route even more attractive for complainants seeking rapid structural relief.

Eligibility and Prerequisites for Filing an Unfair‑Competition Complaint

Before preparing a complaint, confirm that you have standing and that the conduct falls within Czech jurisdictional reach.

• Competitors. Any undertaking whose competitive position is or could be harmed by the respondent’s conduct may file with ÚOHS or commence civil proceedings under the Competition Act.
• Consumers. Individual consumers and consumer organisations may file complaints with CTIA regarding unfair commercial practices, or pursue civil‑court claims for damages and injunctive relief.
• IP rights holders. Where unfair competition overlaps with trademark or design infringement, rights holders may pursue both competition complaints and IP enforcement.
• Foreign entities. A foreign company or individual may file an unfair‑competition complaint in the Czech Republic provided the allegedly unfair conduct has an effect on the Czech market. There is no requirement for a registered Czech presence, standing derives from the market‑effect principle embedded in the Competition Act.

Before filing, identify the specific statutory provision you rely on. For ÚOHS complaints, cite the relevant section of Act No. 143/2001 Coll. For civil claims, reference the applicable unfair‑competition provisions of the Czech Civil Code. Where conduct may also constitute a criminal offence (e.g., trade‑secret misappropriation), a separate criminal complaint to the police is available but rarely used as a primary enforcement mechanism.

Step‑by‑Step Procedure for Filing an Unfair‑Competition Complaint in the Czech Republic

The procedure differs depending on whether you file with ÚOHS, CTIA, or a civil court. Below are the numbered steps for each route, followed by a consolidated cross‑forum timeline table.

Filing with ÚOHS

1. Conduct a pre‑filing review and gather evidence. Prepare an internal memo documenting the timeline of events, affected markets, market data, witness accounts, screenshots of the respondent’s conduct, invoices, price lists, and any correspondence. Preserve all originals, digital evidence should be timestamped and archived.
2. Prepare the formal written complaint. The complaint must identify the parties (complainant and respondent), describe the alleged anti‑competitive conduct in detail, cite the legal basis under Act No. 143/2001 Coll., include a numbered evidence index, and specify the remedies sought, including interim measures, a cease‑and‑desist order, fines, and (where the 2026 draft is enacted) a market‑intervention request.
3. File the complaint in writing with ÚOHS. Submit by post to ÚOHS headquarters in Brno or by e‑mail. Include the signed complaint as a PDF with supporting exhibits. Original signed documents may be requested at a later stage.
4. Await ÚOHS preliminary assessment. ÚOHS will review the complaint and decide whether to open a formal investigation. This preliminary assessment typically takes 2–6 weeks. The complainant is notified of the outcome.
5. Cooperate during the formal investigation. If ÚOHS opens an investigation, it may issue evidence requests to the respondent and third parties and, where justified, conduct on‑site inspections (dawn raids). The complainant should be prepared to supply additional information promptly.
6. Receive the ÚOHS decision. At the conclusion of the investigation, ÚOHS issues a decision that may include cease‑and‑desist orders, behavioural remedies, structural remedies, and/or fines. Formal investigations commonly take 6–12 months or longer for complex, market‑wide cases. Decisions are appealable to the administrative courts.

Tactical tip: Request interim (urgent) measures at the time of filing if the respondent’s conduct is causing immediate, irreversible harm. ÚOHS can act on interim‑measure requests within days to weeks depending on urgency.

Filing with the Czech Trade Inspection Authority (CTIA / ČOI)

1. Identify the consumer unfair commercial practice. Determine whether the conduct constitutes misleading advertising, unfair contract terms, aggressive commercial practices, or another consumer‑protection violation within CTIA’s jurisdiction.
2. Submit the complaint to CTIA. Complaints may be filed online via the CTIA web portal, by telephone, by post, or in person at any regional CTIA inspectorate. Include a description of the conduct, supporting evidence (receipts, screenshots, advertising material), and your contact details.
3. CTIA assesses competence and investigates. CTIA will confirm jurisdiction and, where the complaint falls within its mandate, may initiate an inspection or investigation. For out‑of‑court consumer dispute resolution, CTIA targets conclusion within 90 days of commencement, although complex cases may take longer.

Tactical tip: Use the CTIA route for consumer‑facing misrepresentations and the ÚOHS route for competition distortions between businesses. Where conduct affects both consumers and competitors, consider parallel filings.

Civil Court Route, Injunctive Relief and Damages

1. Prepare the civil claim. Draft the statement of claim seeking the appropriate remedy, injunctive relief (prohibiting the unfair conduct), removal of the detrimental state, a corrective public statement, and/or compensatory damages. Collect valuations, expert reports, and documentary evidence of loss.
2. File with the competent district court. Jurisdiction follows general Czech procedural rules (typically the respondent’s registered seat). File the claim together with all exhibits and, where immediate harm exists, an application for a provisional injunction (předběžné opatření).
3. Pursue enforcement and coordinate with administrative proceedings. Court judgments are independently enforceable. A civil damages award is separate from any ÚOHS fine, the two proceedings can run in parallel without double‑jeopardy concerns.

Consolidated Cross‑Forum Timeline

Required Documents and Information for an Unfair‑Competition Complaint

The strength of a complaint depends on the quality and completeness of its supporting documentation. The table below sets out the documents needed for the unfair competition complaint process in the Czech Republic, regardless of the forum chosen. Preserve all originals and, where documents originate in a language other than Czech, obtain certified Czech translations before filing.

A well‑structured evidence index is critical. Number each exhibit consecutively and cross‑reference it in the body of the complaint. Where the complaint involves digital evidence (social‑media posts, online advertising, pricing algorithms), capture and preserve data promptly, digital content can be removed or altered without notice.

Timeline and Key Deadlines for Filing an Unfair‑Competition Complaint

Many administrative deadlines in unfair‑competition proceedings are case‑specific rather than fixed by statute. The table below consolidates the principal benchmarks a complainant should plan around when assessing how to file an unfair competition complaint in the Czech Republic.

Complainants should diarise every procedural deadline immediately upon receipt of a decision or notice. Missing an appeal window, which is typically set at a fixed number of days from service of the decision, can extinguish the right to challenge an adverse outcome.

Costs, Fees, and Practical Financial Considerations

One advantage of the administrative enforcement route is cost: filing with ÚOHS or CTIA generally incurs no filing fee. Civil litigation, however, carries court fees and potentially substantial counsel and expert costs. The table below provides indicative guidance.

Complainants should budget for expert evidence early. In damages claims, courts routinely expect economic analysis of loss and causation, and the cost of a credible expert report can be substantial.

What Changes in 2026, The Draft Competition Act Amendment and Its Implications

On 27 March 2026, ÚOHS submitted a draft amendment to Act No. 143/2001 Coll. for inter‑ministerial comment. The draft proposes a significant expansion of the authority’s enforcement toolkit, with three principal changes that directly affect complainant strategy.

• New market‑intervention instrument. ÚOHS would gain the power to impose structural or behavioural market‑level remedies even in the absence of a finding that a specific undertaking has infringed the Competition Act. Industry observers expect this tool to be used where market conditions, rather than any single actor’s behaviour, lead to persistent competition concerns.
• Broader and faster interim measures. The draft contemplates enhanced interim‑measure powers, enabling ÚOHS to intervene more rapidly where ongoing conduct threatens irreversible competitive harm. The likely practical effect will be to make the administrative route more attractive for complainants who need immediate relief and currently default to civil provisional injunctions.
• Wider remedial palette. The draft signals a move toward more flexible remedies, including the ability to address conduct that falls short of a full infringement finding. Early indications suggest this could lower the evidentiary threshold for obtaining some forms of administrative relief.

For complainants, the strategic consequence is clear: when drafting a complaint to ÚOHS, describe market‑wide harm and request specific market remedies, not just firm‑specific cease‑and‑desist orders. If the amendment is enacted, a well‑framed ÚOHS complaint may deliver faster corrective action than civil litigation for certain types of unfair conduct.

Important caveat: The draft was in inter‑ministerial comment as of 27 March 2026 and may be materially amended before enactment. Complainants should verify the current legislative status on the ÚOHS website or through the ZakonyProLidi legislative monitor before relying on the proposed new powers in their filing strategy.

Common Pitfalls When Filing an Unfair‑Competition Complaint, and How to Avoid Them

• Late preservation of evidence. Digital content, web pages, social‑media posts, pricing displays, can be removed overnight. Capture and archive evidence immediately using timestamped screenshots, web.archive.org snapshots, or notarised captures.
• Weak market‑harm analysis. Regulators and courts expect concrete data on competitive impact, not unsupported assertions. Engage an economic expert early to quantify market harm and loss.
• Filing in the wrong forum. A consumer misleading‑advertising complaint filed with ÚOHS may be redirected to CTIA, costing weeks. Match the conduct to the correct authority before filing.
• Disclosing trade secrets without protection. If your evidence contains commercially sensitive data, mark it as confidential and request protective measures from ÚOHS at the time of filing. Failure to do so may result in disclosure to the respondent during the investigation.
• Missing translation and certification requirements. Non‑Czech documents must be accompanied by certified Czech translations. Unsigned or untranslated submissions may be returned, delaying the process.
• Not requesting interim measures early. If the respondent’s conduct is causing ongoing harm, request interim measures in the initial filing, not as an afterthought weeks later.
• Underestimating expert‑evidence costs. Budget for economic and market expert reports from the outset. A damages claim without credible quantification is unlikely to succeed.
• Ignoring confidentiality procedures. ÚOHS has established procedures for handling confidential business information. Use them proactively to protect your own data and to request access to non‑confidential versions of the respondent’s submissions.

Sources

1. Office for the Protection of Competition (ÚOHS), Complaints
2. Office for the Protection of Competition (ÚOHS), Legislation / Competition
3. Consolidated Act No. 143/2001 Coll. (Competition Act), WIPO Wipolex
4. ÚOHS, Novela ZOHS 2026 (Draft Amendment Page)
5. Czech Trade Inspection Authority (CTIA / ČOI), Complaints
6. BusinessInfo.cz, Czech Trade Inspection Authority
7. ZakonyProLidi.cz, Draft Bill Listing (Legislative Monitor)
8. ÚOHS Press Release, New Competition Tools
9. ÚOHS, Consolidated Act No. 143/2001 Coll. (PDF)