Introduction
Evidence and ex officio investigation in Turkish administrative courts are central features of administrative litigation. Unlike ordinary private law disputes, administrative cases usually involve an imbalance between the individual and the administration. The administration holds the official file, prepares the administrative act, controls internal records, stores inspection reports, possesses technical documents and often has institutional knowledge that the claimant cannot access easily.
For this reason, Turkish administrative procedure does not rely only on the parties’ submissions. Administrative judges have an active duty to investigate the dispute. This is known as the principle of ex officio investigation, or re’sen araştırma ilkesi. Under this principle, administrative courts may request documents, obtain information, order expert examination, inspect files and clarify the factual and legal basis of the dispute where necessary.
The constitutional foundation of administrative litigation is Article 125 of the Turkish Constitution. This article provides that judicial review is available against administrative acts and actions, that the time limit for filing a lawsuit against an administrative act begins from written notification, and that judicial power is limited to legality review rather than review of administrative expediency. It also states that the administration is liable to compensate damages resulting from its acts and actions.
In practice, evidence and ex officio investigation are decisive in annulment actions, full remedy actions, tax cases, zoning disputes, public procurement cases, disciplinary sanctions, administrative fines, public service liability claims, residence permit disputes, deportation cases and regulatory authority litigation.
What Is Ex Officio Investigation in Turkish Administrative Courts?
Ex officio investigation means that the administrative court is not limited to the evidence and explanations submitted by the parties. The court has the authority and duty to investigate the facts necessary to resolve the dispute lawfully.
Article 20 of Law No. 2577 on Administrative Jurisdiction Procedure is the key provision. It states that the Council of State, administrative courts and tax courts carry out all examinations regarding the cases before them of their own motion. It also provides that courts may ask the parties and other persons or authorities to send documents they deem necessary and to present all types of information within a determined period. Compliance with such interlocutory decisions is compulsory.
The Association Internationale des Hautes Juridictions Administratives also summarizes the Turkish system by explaining that, under the judge’s ex officio investigation principle, administrative judges may request from persons or institutions all information and documents they consider necessary for resolving the dispute.
This principle is one of the main differences between administrative procedure and ordinary civil procedure. In civil litigation, the parties usually carry the main burden of bringing facts and evidence. In administrative litigation, the court has a more active role because the dispute concerns legality of public power.
Why Ex Officio Investigation Matters
The principle matters because administrative litigation is usually asymmetric. The claimant may only possess the final administrative decision and notification document, while the administration holds the complete administrative file. For example, in a disciplinary case, the public institution may have the investigation report, witness statements, internal correspondence and defense request letters. In a tax case, the tax office may hold the tax audit report, assessment documents and collection records. In a zoning case, the municipality may hold zoning plans, plan notes, council decisions, technical reports and construction suspension records.
If the court were limited only to the claimant’s documents, judicial review could become ineffective. The claimant might not be able to prove illegality because the key evidence is in the administration’s possession. Ex officio investigation corrects this imbalance.
This principle also reflects the nature of administrative judicial review. Administrative courts review legality. They must determine whether the administrative act was issued by the competent authority, whether procedure was followed, whether the factual basis was correct, whether the legal basis existed and whether the act was proportionate. These issues often require examination of the administrative file, not merely the parties’ statements.
Written Procedure and the Importance of Documents
Turkish administrative litigation is primarily written. Petitions, defenses, replies, administrative files and written evidence play a central role. Oral hearings may be held in certain cases, but even where a hearing is held, the file remains decisive.
Law No. 2577 requires administrative lawsuit petitions to include the subject and reasons of the case, the evidence on which the case is based, the notification date of the challenged administrative act and, in tax and compensation cases, the disputed amount and relevant tax details where applicable.
This means that the claimant should not rely passively on the court’s ex officio duty. A strong administrative petition must clearly identify the administrative act, explain the legal defects, list evidence, request the administrative file and state which documents should be obtained from the administration.
In Turkish administrative courts, documentary evidence is usually more important than witness testimony. Administrative courts generally resolve disputes through official records, administrative files, expert reports, technical documents, inspection reports, correspondence and written submissions.
The Administrative File as Core Evidence
The administrative file is often the most important evidence in administrative litigation. It contains the documents, reports, internal correspondence, decisions, minutes and technical materials that led to the challenged administrative act.
Under Law No. 2577, the original or certified copy of the files concerning the action must be submitted to the Council of State or the relevant court together with the administration’s defense.
This rule is highly important. The court cannot properly review legality without seeing the administrative file. For example, if a municipality issues a demolition order, the court should examine the construction suspension report, photographs, technical inspection records, committee decision and notification documents. If a public authority imposes a disciplinary penalty, the court should examine the investigation appointment, defense request, witness statements, investigation report and disciplinary board decision. If a tax office issues a payment order, the court should examine whether the debt was finalized, notified, unpaid and legally collectible.
A lawyer should always request that the full administrative file be brought to the court. If the administration submits an incomplete file, this should be expressly objected to.
Evidence in Annulment Actions
An annulment action seeks cancellation of an unlawful administrative act. Evidence in annulment actions is usually directed at proving that the act is unlawful in terms of authority, form, reason, subject or purpose.
Evidence may include:
The administrative decision, notification document, application petitions, rejection letters, internal administrative correspondence, inspection reports, permits, licenses, zoning documents, disciplinary investigation records, tax notices, public procurement documents, regulatory authority reports, expert opinions and photographs.
In an annulment action, the claimant should focus on the legality of the act at the time it was issued. For example, if a residence permit rejection was based on allegedly missing documents, the claimant should submit proof that the documents were actually provided. If a disciplinary penalty was imposed without a proper defense request, the claimant should submit the defense request letter and show its defects. If a zoning plan is challenged, the claimant should submit the previous plan, new plan, plan notes and technical impact evidence.
The court’s ex officio power helps uncover missing or hidden administrative materials. However, the claimant must guide the court by explaining which documents are relevant and why.
Evidence in Full Remedy Actions
A full remedy action seeks compensation for damage caused by administrative acts, administrative actions or omissions. Evidence in full remedy actions is broader than in annulment actions because the claimant must prove damage, causation and administrative responsibility.
Common evidence includes medical records, accident reports, expert opinions, photographs, invoices, repair costs, employment records, income documents, bank statements, property valuation reports, administrative correspondence and previous court decisions.
In public hospital malpractice cases, hospital records and expert medical reports are decisive. In road and infrastructure cases, photographs, accident reports and engineering reports are important. In unlawful enforcement cases, payment orders, attachment records, bank blockage documents and tax files may be crucial. In public service liability cases, the claimant must connect the damage to the administration’s action or failure.
The Constitution expressly provides that the administration is liable to compensate damages resulting from its acts and actions. However, compensation is not automatic. The claimant must establish damage, causation and the legal basis of liability.
Evidence in Tax Courts
Tax courts are part of the administrative judiciary and apply the principle of ex officio investigation. Tax cases are highly document-based. The court may examine tax audit reports, tax/penalty notices, payment orders, accounting records, invoices, bank statements, tax returns, e-notification records, settlement documents, correction requests and collection files.
In tax assessment cases, the key evidence is usually the tax audit report and the taxpayer’s accounting records. In payment order cases, the focus is usually on whether the debt exists, whether it has been paid, whether it is time-barred and whether it has become legally collectible.
Tax courts may also request additional documents from the tax office or taxpayer. Because tax disputes often involve technical accounting issues, expert examination may be ordered where necessary. However, the court must still make the legal assessment itself. An expert report cannot replace judicial reasoning.
Expert Reports in Administrative Litigation
Expert examination is frequently used in administrative cases requiring technical knowledge. Zoning, construction, tax, public procurement, medical malpractice, environmental law, valuation, engineering, financial loss and regulatory disputes may all require expert input.
Law No. 2577 refers to the application of the Civil Procedure Act in matters not regulated by the Administrative Jurisdiction Procedure Law, including expert examination, inspection and obtaining evidence. It also states that the Council of State, court or judge may appoint an expert of its own motion.
This is significant because expert reports often determine the direction of the case. In zoning disputes, experts may examine plan hierarchy, urban planning principles and parcel-specific impact. In medical malpractice cases, experts may evaluate whether public healthcare services were defective. In tax cases, accounting experts may review commercial books and tax calculations. In compensation cases, experts may assess damage amount.
However, expert reports are not binding on the court. The judge must evaluate whether the report is clear, reasoned, complete and consistent with the law. If the report is insufficient, contradictory or incomplete, the parties should object and request a supplementary report or a new expert panel.
Judicial Inspection and On-Site Examination
Some administrative disputes cannot be properly resolved only through documents. In zoning, construction, environmental, road, infrastructure, expropriation and property-related cases, on-site inspection may be necessary.
Judicial inspection helps the court understand physical conditions. For example, in a demolition case, the court may need to see whether the alleged unauthorized construction exists, which part of the building is affected, whether the violation is measurable and whether the administrative report accurately describes the structure. In an infrastructure damage case, an on-site inspection may clarify drainage, road defects, slope, excavation or safety conditions.
Under the procedural framework, inspection and obtaining evidence may be handled through rules referred to by Law No. 2577, and the court may use expert assistance where technical evaluation is required.
A party requesting inspection should explain why the file cannot be resolved without it. A generic inspection request may be rejected. A persuasive request should connect inspection to specific disputed facts.
Late Evidence and Documents Submitted Later
Administrative litigation follows a written sequence: petition, defense, reply and second defense. However, sometimes a party cannot submit a document at the beginning. Law No. 2577 provides that documents not submitted with the petition or defense may be accepted and notified to the other party if the court is convinced that timely submission was impossible.
This rule is important but should not be abused. Parties should submit all available evidence as early as possible. Late evidence should be justified. For example, a document may have been obtained later from the administration, discovered after the case began, or created as part of a later expert process.
If late evidence is accepted, the opposing party should have an opportunity to respond. This protects equality of arms and the right to be heard.
Burden of Proof in Administrative Courts
The principle of ex officio investigation does not completely remove the burden of proof from the parties. The claimant must still present the facts, legal interest, challenged act, harm and supporting evidence. The administration must justify its decision and submit the administrative file.
The burden of proof in administrative litigation is flexible. Where the administration holds the relevant file, it is expected to produce it. If the administration relies on a report, sanction, investigation or technical assessment, it must submit the documents supporting that basis. If it fails to do so, the court may draw conclusions from the absence of evidence.
At the same time, the claimant must be proactive. In a full remedy action, the claimant must prove damage. In a tax case, the taxpayer should submit accounting evidence. In a zoning case, the property owner should submit title records, plans and technical objections. In a disciplinary case, the public servant should submit defense arguments and documents contradicting the allegation.
Failure to Comply With Court Requests
Article 20 of Law No. 2577 provides that compliance with the court’s request for documents and information is compulsory. If a party fails to comply with an interlocutory decision, the court must assess in advance the effect of that failure on the judgment and indicate this in the interlocutory decision.
This mechanism is important because parties and administrations should not be able to obstruct the court’s investigation. If the administration fails to submit a document that it is legally required to produce, the court may evaluate that failure against the administration, especially where the missing document is central to the legality of the act.
A lawyer should carefully review interlocutory decisions. If the court requests documents from the administration and they are not submitted, the claimant should ask the court to consider the consequences of non-compliance. If the requested document is essential, the claimant should insist that the file cannot be decided without it or that the administration’s failure supports annulment.
State Secrets and Non-Submitted Documents
Article 20 also contains a special rule for information and documents concerning state security, high interests of the state or foreign governments together with state security and high interests. In such cases, the relevant ministerial authority may refuse to submit the information or documents by stating reasons. However, the law also provides that a decision cannot be given based on a defense relying on information and documents that have not been submitted.
This is a crucial guarantee. The administration cannot both withhold evidence and use that undisclosed evidence as the basis of its defense. If the administration relies on confidential information, the court must balance state interests with the right to effective judicial protection.
This issue may arise in security-related deportation cases, public order decisions, intelligence-based administrative measures, disciplinary proceedings, public employment security assessments and regulatory matters.
The Court’s Role Is Active but Not Unlimited
Ex officio investigation does not mean that the administrative court becomes the claimant’s lawyer. The court investigates the dispute, but the parties must still present their claims and defenses. The court cannot create a new case outside the subject matter of the petition. It cannot replace the administration by issuing a decision that has the character of an administrative act.
The Constitution and Law No. 2577 both limit administrative judicial review to legality, not expediency. Administrative courts cannot review whether an administrative act is merely convenient or preferable; they review whether it is lawful.
This limitation is important in evidence evaluation. The court may request documents and examine facts, but its final role is to decide legality. For example, in a public procurement case, the court does not manage the tender. In a zoning case, it does not prepare a new plan. In a disciplinary case, it does not act as the disciplinary authority. It reviews whether the administration acted within legal boundaries.
Evidence and the Right to a Fair Trial
Evidence rules in administrative courts are closely connected to the right to a fair trial. Parties must have a meaningful opportunity to present evidence, respond to opposing evidence and comment on expert reports. If the court relies on a document or report without giving the parties an opportunity to respond, this may raise fair trial concerns.
The AIHJA overview notes that Turkish procedural principles are connected with constitutional guarantees such as the freedom to claim rights, the principle of natural judge and the duty of the judiciary to conclude trials as quickly as possible and at minimum cost.
Administrative judges must therefore balance active investigation with procedural fairness. A court may obtain evidence ex officio, but the parties should be informed of decisive materials and allowed to comment where necessary.
Evidence in Zoning and Construction Disputes
Zoning and construction cases are among the most evidence-heavy administrative disputes. Courts often need zoning plans, plan notes, municipal council decisions, construction permits, occupancy permits, construction suspension reports, demolition decisions, photographs, cadastral records, title deeds and technical expert reports.
Ex officio investigation is particularly important because municipalities hold most of the file. The property owner may not have access to internal plan reports or technical records. The court should request the full municipal file and, if necessary, conduct expert examination.
A strong petition should identify the missing documents and explain their relevance. For example, in a zoning plan annulment case, the claimant may request upper-scale plans, plan explanation reports and technical justification documents. In a demolition case, the claimant may request the construction suspension report, photographs and committee decision.
Evidence in Disciplinary Sanction Cases
Disciplinary cases require examination of the full disciplinary investigation file. The court should review the investigator appointment, allegation notice, defense request, witness statements, documents, investigation report, disciplinary board minutes and final sanction decision.
The right of defense is a constitutional guarantee in disciplinary matters. Public servants cannot be subjected to disciplinary penalties without being granted the right of defense, and disciplinary decisions are subject to judicial review.
Evidence matters because a disciplinary sanction cannot rest on suspicion alone. The administration must prove the alleged act. If the investigation is incomplete, the witness statements are contradictory, the defense request is vague or the sanction lacks factual basis, the court may annul the disciplinary penalty.
Evidence in Deportation and Immigration Cases
In immigration-related administrative lawsuits, evidence often includes deportation decisions, residence permit records, entry-exit records, passport pages, notification documents, criminal records, family records, medical reports, employment documents and country-risk evidence.
Where the administration relies on public order or public security, the court may need to examine whether the allegation is concrete, individualized and current. If the administration withholds the evidence but relies on it as a defense, Article 20’s protection against decisions based on non-submitted documents becomes important.
For foreigners, evidence must be collected quickly because immigration cases often have short deadlines. The lawyer should submit all available documents early and ask the court to request missing records from migration authorities.
Evidence in Public Procurement Cases
Public procurement disputes depend heavily on tender documents, administrative specifications, technical specifications, bid files, evaluation minutes, Public Procurement Authority decisions, EKAP records and correspondence.
Because tender processes are time-sensitive, courts and administrative bodies often move quickly. A bidder challenging an exclusion decision should submit bid documents, proof of compliance, comparative evaluation arguments and procurement board precedent where relevant.
Ex officio investigation can help obtain the full tender file. However, the claimant must identify the specific procurement illegality. Courts will not reconstruct the entire tender dispute without precise objections.
Evidence in Regulatory Authority Cases
Regulatory cases may involve complex technical and economic evidence. Competition, banking, energy, capital markets, data protection, electronic communication and public procurement disputes may require review of investigation reports, market data, compliance documents, financial statements, expert economic reports, technical audits and board decisions.
In regulatory litigation, ex officio investigation helps the court examine whether the regulator relied on sufficient evidence. However, companies should submit their own technical and economic evidence. For example, in a competition case, market analysis may be necessary. In a data protection case, cybersecurity and compliance records may be decisive. In an energy case, technical license documents may matter.
Practical Litigation Strategy
A strong evidence strategy in Turkish administrative courts should begin before the lawsuit is filed.
First, identify the exact administrative act. Second, determine which documents the claimant already has. Third, identify which documents are likely held by the administration. Fourth, list the evidence in the petition. Fifth, request the complete administrative file. Sixth, request expert examination or inspection where technical issues require it. Seventh, object to incomplete expert reports or missing administrative documents.
The petition should not simply say “we request ex officio investigation.” It should say what the court should investigate and why. For example:
“The full disciplinary investigation file, including witness statements and the defense request letter, should be requested from the defendant administration because the challenged sanction was imposed without sufficient evidence and without an effective defense opportunity.”
This style guides the court and strengthens the evidentiary foundation of the case.
Common Mistakes in Evidence Management
The first mistake is assuming that the court will find everything without guidance. Ex officio investigation is powerful, but a vague petition weakens the case.
The second mistake is failing to request the full administrative file. Many cases are won or lost based on documents held by the administration.
The third mistake is submitting evidence too late without justification. Late documents may be accepted only if the court is convinced that timely submission was impossible.
The fourth mistake is not objecting to expert reports. If a report is incomplete or legally flawed, objections should be detailed and timely.
The fifth mistake is focusing only on legal arguments and ignoring factual proof. Administrative litigation is legality review, but legality often depends on facts.
The sixth mistake is failing to connect evidence to legal defects. Each document should support a specific argument.
Why Legal Representation Matters
Evidence in administrative litigation is technical. A lawyer must know what the administrative file should contain, which documents must be requested, when expert examination is necessary, how to object to reports and how to use Article 20 strategically.
In many cases, the decisive issue is not the existence of a legal rule, but whether the administration can prove that it applied the rule correctly. A Turkish administrative lawyer can expose missing documents, defective investigations, incomplete technical reports, unsupported allegations and procedural violations.
For companies and foreign investors, evidence strategy is especially important in tax, regulatory, procurement, zoning and licensing disputes. For individuals, it is critical in disciplinary, immigration, public employment and compensation cases.
Conclusion
Evidence and ex officio investigation are defining features of Turkish administrative litigation. Administrative courts are not passive observers limited to the parties’ submissions. Under Article 20 of Law No. 2577, the Council of State, administrative courts and tax courts examine cases of their own motion and may request documents and information from parties, persons and authorities.
This principle protects effective judicial review because administrative disputes often involve an imbalance of information. The administration usually holds the official file, internal records and technical reports. Ex officio investigation allows the court to request those materials and assess whether the administrative act is lawful.
However, parties must still act strategically. A claimant should submit available evidence, identify missing documents, request the administrative file, seek expert examination where necessary and object to incomplete reports. The court’s active role does not excuse vague petitions or weak evidence management.
In Turkish administrative courts, successful litigation depends on combining legal argument with evidentiary precision. The strongest petitions do not merely assert that an administrative act is unlawful. They show which facts, documents and procedural defects prove unlawfulness. When used effectively, evidence and ex officio investigation can reveal the real basis of administrative action, protect individuals and companies against arbitrary public power, and strengthen the rule of law in Turkey.
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