Introduction
Filing a complaint against a public tender in Turkey is one of the most important legal remedies available to bidders, candidates and potential bidders affected by unlawful procurement procedures. Public tenders in Turkey are highly formal administrative processes. A bidder may lose a tender not because its offer is commercially weak, but because the contracting authority drafted an unlawful technical specification, rejected a valid document, accepted a non-compliant competitor, misapplied qualification criteria, wrongly evaluated an abnormally low bid explanation or cancelled the tender without lawful grounds.
The main legislation governing public tender complaints is Public Procurement Law No. 4734. Under this law, candidates, tenderers and potential tenderers who claim that they have suffered or may suffer loss of rights or damage due to unlawful procedures or actions within the tender process may file complaint and appeal applications. The law also states that complaint and appeal applications are mandatory administrative remedies before filing a lawsuit.
For this reason, a company that wants to challenge a public tender in Turkey must understand the correct sequence: first, a complaint application to the contracting authority; then, where necessary, an appeal complaint before the Public Procurement Authority; and finally, judicial review before administrative courts. Missing a deadline or filing the wrong type of application may cause loss of rights even where the tender is genuinely unlawful.
What Is a Public Tender Complaint in Turkey?
A public tender complaint is a formal administrative application submitted against an allegedly unlawful act, omission or decision in a public procurement process. It is not an informal objection, commercial protest or ordinary email to the contracting authority. It is a legally regulated remedy under Public Procurement Law No. 4734.
The complaint mechanism exists to protect the principles of transparency, competition, equal treatment, reliability, public supervision and efficient use of public resources. If a tender document, technical specification, qualification criterion, bid evaluation or award decision violates these principles, the affected party may use the complaint procedure.
A complaint may target different stages of the tender. For example, a potential bidder may complain about a restrictive technical specification before the tender deadline. A candidate may complain about an unlawful prequalification decision. A tenderer may complain about being excluded from evaluation. A bidder may also complain that the winning competitor should have been excluded because its bid did not comply with the tender documents.
Complaint and Appeal Complaint: The Difference
Turkish public procurement law uses a two-stage administrative remedy system.
The first stage is the complaint application before the contracting authority. This is submitted to the public institution conducting the tender. The contracting authority may accept the complaint, reject it, amend the tender documents, take corrective action or maintain its original decision.
The second stage is the appeal complaint before the Public Procurement Authority. If the contracting authority rejects the complaint, fails to answer within the legal period or gives an insufficient decision, the applicant may file an appeal complaint before the Authority. The Public Procurement Authority then reviews the dispute within the limits of procurement law, tender documents and the applicant’s claims.
This distinction is essential. In most cases, a bidder cannot directly go to court or directly apply to the Public Procurement Authority without first filing a complaint before the contracting authority. The administrative remedy sequence must be followed carefully.
Who Can File a Complaint Against a Public Tender?
A complaint may be filed by candidates, tenderers and potential tenderers.
A candidate is generally a person or company that applies for prequalification in a tender where prequalification is required. A tenderer is a person or company that submits a bid. A potential tenderer is a person or company that may be interested in the tender and is affected by the tender notice, tender documents or technical specifications.
This means that a company does not always need to submit a bid before filing a complaint. If the tender documents prevent fair participation, the company may complain as a potential tenderer. For example, if a technical specification unlawfully points to a specific brand or if an administrative specification imposes an impossible qualification criterion, a potential bidder may file a complaint before the tender takes place.
The key requirement is legal interest. The applicant must claim that the unlawful tender act has caused or may cause loss of rights or damage. A general public-interest objection without bidder interest may not be sufficient.
Common Legal Grounds for Filing a Complaint
Public tender complaints in Turkey may be based on many legal grounds. The most common grounds include:
Restrictive technical specifications; brand- or model-oriented tender documents; discriminatory qualification criteria; excessive work experience requirements; unclear administrative specifications; unlawful domestic bidder advantage; wrongful exclusion from evaluation; rejection of valid documents; acceptance of a competitor’s non-compliant bid; defective abnormally low bid evaluation; unlawful tender cancellation; failure to apply equal treatment; incorrect EKAP procedures; and violation of public procurement principles.
A complaint should not be based only on the statement that the tender is “unfair.” The applicant must identify the unlawful act and explain why it violates the law, tender documents or procurement principles.
For example, if the complaint concerns a technical specification, the applicant should identify the exact clause, explain how it restricts competition and show that equivalent products or methods can satisfy the public need. If the complaint concerns the winning bidder’s documents, the applicant should explain which document is allegedly missing, invalid or non-compliant.
Complaint Against Tender Documents
One of the most important complaint types concerns tender documents. Tender documents include the tender notice, administrative specification, technical specification, draft contract, standard forms and annexes. If these documents are unlawful, the tender may be defective from the beginning.
Complaints against tender documents are especially time-sensitive. Under Law No. 4734, the complaint period for issues included in the procurement notice starts from the first publication date of the notice. For other provisions of prequalification or tender documents that are not reflected in the notice, the period starts from the date of obtaining the relevant document.
The law also provides that complaints regarding the procurement notice, prequalification documents or tender documents must be submitted no later than three working days before the tender or application deadline, provided that the ordinary complaint periods are not exceeded.
This is a crucial rule. If a bidder notices that the technical specification is restrictive, it should not wait until after losing the tender. If the defect is visible in the tender documents, the complaint must generally be filed before the tender deadline.
Complaint Deadlines Under Turkish Public Procurement Law
Deadlines are one of the most dangerous aspects of public procurement complaints in Turkey. Under Article 55 of Law No. 4734, a complaint must be filed before the contract is signed and within the applicable complaint period.
The general complaint period is ten days. However, for procurements conducted under Article 21(b) and Article 21(c), the period is five days. The period begins from the date when the procedure or action subject to complaint occurred or should have been realized.
In practice, the relevant starting date may be the publication date of the tender notice, the date of downloading or obtaining the tender documents, the notification date of an exclusion decision, the tender award notification date or the date on which another unlawful act became known.
Because these periods are short, companies should calculate deadlines immediately. A strong legal argument may become useless if filed late.
Content of the Complaint Petition
A complaint petition must be specific, structured and evidence-based. Under Law No. 4734, complaint and appeal petitions must include information such as the applicant’s name, title and address; the contracting authority; the subject matter of the procurement or procurement registration number; the date when the disputed act was notified or became known; and the subject, reasons and evidence of the application.
A strong complaint petition should include the following elements:
The identity and contact information of the applicant; the tender registration number; the contracting authority; the tender subject; the applicant’s status as candidate, tenderer or potential tenderer; the specific act or decision being challenged; the date of notification or awareness; the legal grounds; the factual explanation; supporting evidence; and a clear remedy request.
The remedy request is important. The applicant may request amendment of the tender documents, cancellation of an unlawful clause, re-evaluation of bids, exclusion of a non-compliant bidder, correction of an evaluation error or cancellation of the tender where the illegality cannot be remedied.
How to File the Complaint
A complaint is generally submitted to the contracting authority conducting the tender. Depending on the tender and applicable electronic procurement rules, the application may be made physically or electronically through EKAP.
The electronic complaint system has become increasingly important. The Public Procurement Authority announced that, for tenders announced or notified on or after 15 April 2024, complaint applications to contracting authorities and appeal complaint applications to the Authority must be made through EKAP with e-signature in certain negotiated procedure tenders under Article 21(a), 21(d) and 21(e), and in all tender procedures where the application is made through lawyers.
The Authority also announced that lawyers can submit complaint and appeal complaint applications through EKAP, provided that the EKAP-registered real or legal person grants the lawyer “Attorney” authorization and the lawyer pays the bar stamp fee through EKAP before signing and submitting the petition.
Therefore, bidders should not leave EKAP authorization until the last day. If a lawyer will file the complaint, the company must ensure that the lawyer is properly authorized in EKAP and that e-signature and payment steps are completed.
What Happens After the Complaint Is Filed?
After receiving the complaint, the contracting authority must review it and issue a reasoned decision within the legal period. Under Law No. 4734, the contracting authority must decide on the complaint within ten days after receiving it.
The authority may accept the complaint and take corrective action. It may amend the tender documents, postpone the tender, re-evaluate a bid, correct an administrative error or exclude a non-compliant bidder. Alternatively, it may reject the complaint.
If the contracting authority rejects the complaint or does not respond within the legal period, the applicant may proceed to the second stage by filing an appeal complaint before the Public Procurement Authority.
The first-stage complaint should be taken seriously. It is not merely a procedural formality. The arguments raised before the contracting authority may shape the later appeal complaint. A weak first complaint may reduce the effectiveness of the appeal.
Appeal Complaint Before the Public Procurement Authority
If the applicant is not satisfied with the contracting authority’s decision, or if the authority fails to decide within the legal period, the applicant may file an appeal complaint before the Public Procurement Authority.
Article 56 of Law No. 4734 regulates appeal complaints. Candidates, tenderers and potential tenderers who previously filed a complaint before the contracting authority may apply to the Public Procurement Authority before the contract is signed if they consider the contracting authority’s decision unlawful or if no decision is given within the required period.
The appeal complaint is a specialized administrative review. The Public Procurement Authority examines whether the tender procedure complies with the law, tender documents and public procurement principles. It does not simply conduct a commercial re-evaluation; it reviews legality.
Appeal Complaint Fee and Refund
Filing an appeal complaint before the Public Procurement Authority requires payment of an application fee under the relevant legal framework. The Authority announced that appeal complaint fees may be refunded if the applicant is found justified in all claims, provided that the applicant submits a written request within thirty days following notification of the Board decision.
This is an important practical point. If the Public Procurement Board accepts all claims of the applicant, the applicant should not forget to request refund of the appeal complaint fee within the required period.
In practice, the fee issue should be handled carefully at the time of filing. Failure to pay the required fee or attach proof of payment may create procedural risk.
Possible Decisions of the Public Procurement Authority
After reviewing the appeal complaint, the Public Procurement Authority may issue several types of decisions.
It may reject the application if it is late, procedurally defective, outside jurisdiction or legally unfounded. It may order corrective action if the illegality can be remedied without cancelling the entire tender. It may also determine that the tender process cannot lawfully continue where the defect is fundamental.
Corrective action is often the most practical remedy. For example, the Authority may require re-evaluation of bids, reconsideration of a work experience certificate, exclusion of a non-compliant bidder, re-examination of an abnormally low bid explanation or correction of an unlawful evaluation method.
If the Public Procurement Authority’s decision is unlawful, the applicant may seek judicial review before administrative courts.
Can the Contract Be Signed During the Complaint Process?
The timing of contract signing is critical in public procurement disputes. If the contract is signed before the complaint and appeal process is properly completed, the bidder’s remedy may become less effective.
Law No. 4734 contains rules restricting contract signing during the complaint and appeal process. Where a complaint has been filed, the contracting authority must observe the relevant waiting periods and must check whether an appeal complaint has been filed before signing the contract. If an appeal complaint is filed, the Public Procurement Authority’s final decision must be awaited within the legal framework.
This is why bidders must act quickly. Filing a proper complaint before contract signing can preserve the effectiveness of the remedy.
Judicial Review After the Public Procurement Authority Decision
Final decisions of the Public Procurement Authority may be challenged before Turkish administrative courts. Article 57 of Law No. 4734 provides that final decisions of the Authority regarding complaints are subject to judicial review and that such cases have priority.
Judicial review generally focuses on whether the Public Procurement Authority’s decision is lawful. The court may examine whether the Authority correctly applied Law No. 4734, secondary legislation, tender documents, equal treatment and public procurement principles.
In many procurement disputes, the judicial process is time-sensitive because the tender may proceed quickly. Therefore, the claimant may also request suspension of execution where the conditions exist.
EKAP and Electronic Complaint Strategy
EKAP is now an essential part of public tender complaints. The Public Procurement Authority’s digital systems allow certain complaint and appeal applications to be filed electronically, and the use of e-signature has become mandatory in important categories, especially where lawyers file the application.
Companies should therefore create an internal EKAP complaint protocol. This protocol should determine who monitors tender notifications, who downloads tender documents, who calculates deadlines, who authorizes the lawyer, who signs applications and who preserves electronic submission records.
The EKAP system may reduce formal errors, but it does not replace legal analysis. The complaint petition must still be legally strong, factually accurate and supported by evidence.
Complaint Against Restrictive Technical Specifications
One of the most common complaint types concerns restrictive technical specifications. A technical specification may be unlawful if it effectively favours one brand, model, product, manufacturer, supplier or technology without objective justification.
A bidder challenging a technical specification should identify the exact clauses that restrict competition. The petition should explain why the clause is not necessary for the public need and should show that alternative products, methods or technologies can satisfy the same requirement.
Technical evidence is important. Product catalogues, comparison tables, expert reports, market research and international standards may strengthen the complaint.
The most important rule is timing. If the restrictive clause is in the tender documents, the complaint must generally be filed before the tender deadline.
Complaint Against Wrongful Exclusion
Another common complaint concerns wrongful exclusion from evaluation. A bidder may be excluded because of alleged document deficiency, invalid tender security, insufficient work experience, non-compliant technical documents, financial qualification failure or improper EKAP submission.
To challenge exclusion, the bidder must focus on the exact exclusion reason. If the issue is work experience, the petition should explain how the document satisfies the tender criteria. If the issue is tender security, the petition should compare the guarantee with the required standard. If the issue is technical compliance, the bidder should show where the product or service meets each requirement.
A general claim that the exclusion is unfair is not enough. The complaint must directly answer the contracting authority’s reasoning.
Complaint Against Acceptance of a Competitor’s Bid
A bidder may also complain that a competitor’s bid was unlawfully accepted. This may occur where the winning bidder lacked required documents, submitted an invalid guarantee, failed to meet work experience criteria, offered a non-compliant product or provided an inadequate abnormally low bid explanation.
This type of complaint must be specific. The applicant should identify the competitor, the alleged non-compliance and the tender rule violated. Where the applicant does not have access to all competitor documents, it may rely on disclosed evaluation information, tender documents, price data, technical requirements and reasonable legal arguments.
The Public Procurement Authority may examine the tender file within the scope of the applicant’s claims at the appeal stage.
Complaint Against Abnormally Low Bid Evaluation
Abnormally low bid evaluation is a frequent source of disputes. A bidder whose explanation is rejected may complain that its explanation was sufficient and legally supported. Other bidders may complain that the winning bidder’s abnormally low bid explanation was wrongly accepted.
A strong complaint should compare the explanation request with the submitted documents. It should show whether labour costs, material costs, logistics, supplier offers, public unit prices, technical advantages or stock conditions were properly addressed.
Because abnormally low bid disputes involve technical and financial analysis, supporting documents are essential. A vague allegation that a price is “too low” is usually insufficient.
Complaint Against Tender Cancellation
Tender cancellation may also be challenged in certain circumstances. A contracting authority may cancel a tender for lawful reasons, but the cancellation must be reasoned, objective and consistent with procurement principles.
If the cancellation is arbitrary, discriminatory, unsupported by the tender file or designed to avoid awarding the tender to a particular bidder, legal remedies may be available.
Appeal rules for cancellation decisions may differ depending on the basis of cancellation. Therefore, deadline calculation must be done carefully and immediately after notification.
Practical Checklist for Filing a Complaint
Before filing a complaint against a public tender in Turkey, bidders should follow this checklist:
Identify the disputed act or decision. Determine whether the applicant is a candidate, tenderer or potential tenderer. Calculate the deadline. Check whether the complaint must be filed before the contracting authority. Review the tender notice, administrative specification, technical specification and draft contract. Collect supporting evidence. Prepare a precise petition. Include the tender registration number and notification date. Request a concrete remedy. If filing through a lawyer, ensure EKAP authorization and e-signature readiness. Preserve proof of submission. Monitor the contracting authority’s response period. Prepare for appeal before the Public Procurement Authority if needed.
This checklist is essential because public procurement complaints are formal and time-sensitive.
Common Mistakes When Filing a Complaint
The first common mistake is filing late. Turkish public procurement deadlines are short, and late applications are usually rejected without examination of the merits.
The second mistake is filing a vague complaint. A complaint should identify the exact unlawful act and legal grounds.
The third mistake is objecting to tender documents after the tender result. If the defect was visible in the tender documents, the complaint should generally have been filed before the tender deadline.
The fourth mistake is failing to authorize the lawyer properly through EKAP where electronic filing is required.
The fifth mistake is not preserving evidence. Tender documents, EKAP records, notifications, bid documents and technical reports may become critical at the appeal and court stages.
The sixth mistake is confusing complaint with appeal complaint. The first application is generally made to the contracting authority; the Public Procurement Authority stage comes later.
Special Considerations for Foreign Companies
Foreign companies may file complaints against public tenders in Turkey if they are candidates, tenderers or potential tenderers affected by an unlawful tender act. However, foreign bidders should be especially careful with EKAP registration, Turkish representation, sworn translations, apostille, foreign work experience documents, foreign bank guarantees and domestic bidder advantages.
If a foreign bidder claims that a tender document unlawfully excludes foreign participation, favours domestic bidders beyond legal limits or rejects equivalent foreign documents, it should act quickly.
Foreign companies should also authorize Turkish legal counsel early. Waiting until the final days of the complaint period may be risky because translations, EKAP authorization and internal approvals can take time.
Why Legal Support Is Important
Filing a complaint against a public tender in Turkey requires knowledge of public procurement law, administrative procedure, EKAP, Public Procurement Authority practice and tender-specific technical issues.
A public procurement lawyer can help identify the correct remedy, calculate deadlines, draft the complaint petition, prepare technical and legal evidence, file through EKAP, pursue appeal before the Public Procurement Authority and initiate judicial review where necessary.
Legal support is especially important in high-value tenders, construction works, service procurement, medical device tenders, software tenders, foreign bidder disputes, abnormally low bid cases and restrictive technical specification challenges.
Frequently Asked Questions
Who can file a complaint against a public tender in Turkey?
Candidates, tenderers and potential tenderers who claim that they have suffered or may suffer loss of rights or damage due to unlawful tender procedures may file complaint and appeal applications under Law No. 4734.
What is the first step in filing a complaint?
The first step is generally filing a complaint before the contracting authority conducting the tender.
What is the complaint deadline?
The general deadline is ten days, but it is five days for procurements under Article 21(b) and 21(c). The complaint must be filed before contract signing.
Can tender documents be challenged?
Yes. Tender notices, administrative specifications, technical specifications and other tender documents may be challenged, but complaints against tender documents must generally be filed before the tender deadline and no later than three working days before the tender or application deadline.
Can lawyers file complaints through EKAP?
Yes. The Public Procurement Authority announced that lawyers can file complaint and appeal complaint applications through EKAP if the relevant EKAP-registered person grants “Attorney” authorization and the required bar stamp fee is paid through EKAP.
Is electronic filing mandatory?
For tenders announced or notified on or after 15 April 2024, electronic filing through EKAP with e-signature is mandatory in certain negotiated procedure tenders and in all tender procedures where applications are made through lawyers.
Can Public Procurement Authority decisions be challenged in court?
Yes. Final decisions of the Public Procurement Authority regarding complaints are subject to judicial review before Turkish courts.
Conclusion
Filing a complaint against a public tender in Turkey is a powerful but highly formal legal remedy. It allows candidates, tenderers and potential tenderers to challenge unlawful tender documents, restrictive technical specifications, wrongful exclusion, unlawful acceptance of competitor bids, defective abnormally low bid evaluations, arbitrary cancellation and other procurement violations.
However, the complaint process is strict. Deadlines are short, procedural requirements are detailed and the correct sequence must be followed. In most cases, the applicant must first file a complaint before the contracting authority. If the complaint is rejected or not answered, an appeal complaint may be filed before the Public Procurement Authority. Final Authority decisions may then be challenged before administrative courts.
The most important practical lesson is early action. Tender documents should be reviewed immediately after publication or download. If the illegality is visible in the tender documents, the complaint should generally be filed before the tender deadline. If the issue arises during bid evaluation, the bidder should act immediately after notification.
A successful complaint requires more than alleging unfairness. It requires precise legal reasoning, evidence, correct deadline calculation, proper EKAP use and a clear remedy request. For Turkish and foreign companies alike, professional legal support can make the difference between losing a tender permanently and restoring legality in the procurement process.
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