Participation, aiding, and joint criminal liability in Turkey are among the most important topics in Turkish criminal law because many criminal cases do not involve a single actor operating alone. Business crimes, violent incidents, organized conduct, fraud files, customs cases, digital crimes, and even ordinary street offenses often raise the same central question: who is legally responsible, and in what capacity? Turkish law does not answer that question with a vague theory of collective blame. It uses a structured system that distinguishes between principal perpetrators, co-perpetrators, indirect perpetrators, instigators, and aiders, and it limits liability through the legality principle, the requirement of an intentional and unlawful principal act, and the rule that criminal responsibility is personal. The core statutory framework appears in Articles 37 through 41 of the Turkish Penal Code No. 5237, read together with Articles 2, 20, 21, 35, and 36, and with the constitutional guarantees of fair trial, lawful evidence, and personal criminal responsibility.
The constitutional background matters from the outset. Article 36 of the Constitution guarantees the right to a fair trial through legitimate means and procedures. Article 38 states that no one shall be considered guilty until proven guilty in a court of law, that no one may be compelled to incriminate himself or herself or close relatives, that findings obtained through illegal methods shall not be considered evidence, and that criminal responsibility is personal. Those guarantees are especially important in participation cases because prosecutors and courts are often tempted to move too quickly from group involvement to group guilt. Turkish constitutional law rejects that shortcut. Even where several people are present in the same event, each person’s criminal role must still be established lawfully and individually. (Anayasa Mahkemesi)
The legality principle reinforces the same point. Article 2 of the Penal Code states that no one may be punished for an act that the law does not clearly define as a crime, and that criminal provisions cannot be expanded by analogy. In the context of participation, this means courts cannot invent a free-floating notion of “being somehow involved.” They must classify the defendant under the categories the Code actually recognizes: principal perpetrator, indirect perpetrator, instigator, aider, or non-liable participant. This is one of the reasons participation doctrine matters so much in Turkish criminal law. It prevents criminal responsibility from expanding purely because a case involves several actors.
A proper analysis also starts with Article 20 of the Penal Code, which states that criminal responsibility is personal and that no one may be held responsible for another person’s act. The same article adds that criminal sanctions cannot be imposed on legal persons, though security measures specifically provided by law remain possible. This rule does enormous work in participation cases. It means that even in a coordinated setting, liability must still be traced to each defendant’s own culpable conduct. It also means that in corporate or organizational settings, the mere existence of a company or legal entity does not eliminate the need to identify the natural persons who allegedly committed, directed, or assisted the offense.
The mental-state structure is equally important. Article 21 provides that an offense is formed only where intent exists and defines intent as knowingly and willingly realizing the statutory elements of the offense. That matters because the participation provisions in Articles 37 to 41 are built around intentional crime logic. Participation is not an all-purpose doctrine that automatically converts proximity or carelessness into criminal liability. In Turkish law, the classification of a person as a perpetrator, instigator, or aider presupposes a culpable relationship to an intentional offense, unless a separate statute expressly creates a different model.
Principal perpetration and joint perpetration
Article 37 begins with the law of principal perpetration. Its first paragraph states that where several persons jointly realize the act contained in the legal definition of the offense, each of them is responsible as a perpetrator. This is the statutory foundation of joint perpetration in Turkish law. The key point is that the persons must jointly realize the act defined in the offense. Turkish law does not treat every form of support or sympathy as perpetration. Perpetration is tied to the offense act itself. That is why the distinction between Article 37 and Article 39 is so important: one concerns direct participation in the realization of the offense, while the other concerns assistance.
In practical terms, Article 37 requires careful factual analysis. The court must ask whether the accused actually participated in carrying out the conduct that makes up the statutory definition, rather than merely creating a favorable atmosphere or providing peripheral support. As an inference from the text of Article 37, Turkish law reserves the status of perpetrator for those whose conduct is sufficiently central to the offense’s realization. This is especially important in multi-defendant files, where prosecutors sometimes describe a shared scene but fail to identify who actually carried out the offense act and who merely accompanied, observed, or supported in a lesser way.
Article 37 also recognizes indirect perpetration. Its second paragraph states that a person who uses another person as an instrument in committing the offense is also responsible as a perpetrator. It further provides that where the person used as an instrument lacks culpability capacity, the indirect perpetrator’s sentence is increased by one-third to one-half. This is a very significant rule because it shows that Turkish law looks past physical execution in some cases and focuses on who actually controlled the offense through another human instrument. It also confirms that exploiting a person who lacks culpability capacity is treated more seriously, not more leniently.
This indirect-perpetration rule is especially important in cases involving minors, persons lacking criminal capacity, manipulated subordinates, or intermediaries who do not fully appreciate the offense they are being used to carry out. Defense lawyers should pay close attention here because prosecutors may sometimes label a person a principal without proving the control structure that Article 37(2) presupposes. Turkish law does not treat “giving an order” and “using another as an instrument” as interchangeable concepts in the abstract. The factual and mental structure still has to fit the statutory model.
Instigation under Article 38
Article 38 regulates instigation. Its first paragraph states that a person who instigates another person to commit an offense is punished with the penalty of the committed offense. That is a strong rule. Turkish law treats instigation as a full form of criminal participation with punishment tied to the principal offense itself. But that does not mean the concept is loose. The legal question is whether the accused truly caused another person to form or activate the decision to commit the crime in the legally relevant sense described by Article 38. Mere approval after the fact, passive awareness, or weak moral support should not automatically be treated as instigation.
Article 38 then adds two special rules. First, where instigation occurs through the influence arising from an ascendant-descendant relationship, the instigator’s sentence is increased by one-third to one-half; the same increase applies to instigation of children even without such a relationship. Second, where the instigator is not otherwise identifiable, the perpetrator or another accomplice who enables the instigator’s identity to be revealed may receive a substantial sentence reduction. These provisions show that Turkish law is sensitive both to coercive influence within family power structures and to evidentiary difficulties in proving who stood behind the offense.
From a defense perspective, Article 38 creates several important issues. The first is causation of the criminal decision. Did the accused truly instigate, or did the principal already have the offense plan? The second is proof. In many files, “he told me to do it” appears in statements without much corroboration. Because instigation carries the full offense penalty, Turkish courts should require careful proof rather than infer it from association or hierarchy alone. The third is classification. Conduct that looks accusatory may sometimes fit aiding under Article 39 better than instigation under Article 38, and that distinction can dramatically affect sentencing.
Aiding under Article 39
Article 39 governs aiding. Its first paragraph sets the punishment rule: where the completed offense carries aggravated life imprisonment, the aider is punished with fifteen to twenty years’ imprisonment; where it carries life imprisonment, the aider receives ten to fifteen years; and in other cases the principal penalty is reduced by half, though the resulting sentence may not exceed eight years. Turkish law therefore treats aiding as serious criminal participation, but it still differentiates it from full perpetration and instigation by imposing a lower penalty structure in ordinary cases.
The second paragraph of Article 39 is especially valuable because it lists the typical forms of aiding. A person is treated as an aider where that person: encourages the commission of the offense, strengthens the decision to commit it, promises assistance after the act, gives guidance on how the offense will be committed, provides the tools used in the offense, or facilitates execution by helping before or during the offense. This list is one of the most practically useful provisions in Turkish participation law because it gives courts and lawyers concrete statutory language for separating aid from principal perpetration.
For defense lawyers, the structure of Article 39 offers an important strategic lesson. The prosecution must do more than show that the accused was present in a broad criminal environment. It must identify which form of aid is actually alleged and prove it. Was there encouragement, advice, tool provision, promise of later help, or pre- or mid-offense facilitation? A vague claim that the accused was “connected” to the main actor is not enough under the statute itself. Because Article 39 contains a defined participation model, defense submissions should force the court to match the facts precisely to one of its categories or abandon the aiding theory.
The accessory rule in Article 40
Article 40 contains one of the most important ideas in Turkish participation law: the accessory rule, or bağlılık kuralı. Its first paragraph states that, for criminal participation, the existence of an intentional and unlawful act is sufficient. It further states that each participant is punished according to his or her own culpable act without regard to personal reasons that may prevent another participant’s punishment. This sentence performs several functions at once. It shows that participation depends on the existence of an intentional and unlawful principal act. It also shows that personal exculpatory or non-punishment reasons do not automatically spread from one participant to another. Turkish law thus combines dependency and individuality in the same provision.
This rule is especially important where one participant benefits from a personal defense, immunity, or excuse. Article 40 says that such personal reasons do not determine the liability of other participants. In practical terms, one person’s personal non-punishability does not necessarily collapse the whole case. At the same time, because Article 40 still requires an intentional and unlawful act, the prosecution cannot build participation liability on a non-offense or on a legally justified principal act. This balance is one of the defining features of Turkish participation doctrine.
Article 40(2) then deals with special offenses, or özgü suçlar. It states that in such offenses only a person possessing the special perpetrator quality can be the principal perpetrator, while other participants are punished only as instigators or aiders. This is a critical rule in public-official crimes, fiduciary offenses, and other offense types that require a special legal status. Turkish law therefore does not allow the principal-perpetrator category to expand beyond the person who actually possesses the legally required characteristic. Others may still be liable, but only through the participation forms recognized by law.
Article 40(3) adds another major limit: for participation liability to arise, the relevant offense must have reached at least the attempt stage. This is a crucial doctrinal point. Turkish law does not permit participation liability to attach where the supposed principal offense never advanced even to criminal attempt. That means participation is not triggered by mere criminal conversation, raw intention, or abstract planning in the absence of at least attempted execution, unless a separate offense specifically punishes that earlier conduct. Article 40(3) therefore ties the law of participation directly to the law of attempt in Article 35.
Voluntary abandonment in participation cases
Article 41 deals with voluntary abandonment in jointly committed crimes. It states that only the accomplice who voluntarily abandons the offense benefits from the voluntary-abandonment rules. It then adds that those rules still apply where the crime was not committed for a reason other than the abandoning participant’s efforts, or where the crime was committed despite all of that participant’s efforts to prevent it. This is a strikingly precise rule. Turkish law recognizes that in multi-actor cases, one participant may genuinely try to withdraw or stop the offense even if others continue. The law therefore individualizes the abandonment doctrine rather than treating all accomplices as locked together fatefully.
This provision is important because it rewards de-escalation. It also prevents overbroad guilt by making room for the possibility that one participant’s role changed before completion. In defense practice, Article 41 should be considered carefully whenever the file shows late withdrawal, warning others to stop, calling for help, trying to prevent completion, or refusing to carry through a coordinated criminal plan. The difference between Article 41 and ordinary participation liability can be outcome-determinative.
Participation, attempt, and abandonment
Because Article 40(3) requires the offense to reach at least the attempt stage, Articles 35 and 36 matter directly to participation analysis. Article 35 states that a person is liable for attempt where, with intent to commit a crime, the person begins directly to execute it through suitable acts but cannot complete it for reasons beyond the person’s control. Article 36 then provides that a person who voluntarily abandons execution or personally prevents completion is not punished for attempt, though liability for any separately completed offense remains. These rules help define when participation liability becomes possible and when voluntary abandonment may block it.
In practice, this means lawyers handling participation cases must often ask a layered set of questions: Did the principal offense reach at least attempted execution? If yes, what role did the defendant play—principal, instigator, aider? If the file involves abandonment, was that abandonment external failure under Article 35 or genuine voluntary abandonment under Articles 36 and 41? Turkish law is designed to keep these categories separate, and mistakes in classification can produce serious sentencing errors.
Procedural proof and the role of the trial court
The law of participation does not operate outside criminal procedure. The Code of Criminal Procedure states in Article 1 that it regulates how criminal proceedings are conducted and the rights, powers, and duties of participants in the process. Article 206 states that evidence requested to be produced must be rejected if it was obtained unlawfully. Article 217 states that the charged offense may be proven only by lawfully obtained evidence, and that the court bases its decision on evidence presented and discussed at the hearing. Article 230 requires the reasoning of a conviction to set out the views raised in accusation and defense, to discuss and evaluate the evidence, to identify the evidence relied upon and rejected, and to specify separately and expressly any evidence in the file obtained through unlawful methods.
These provisions are especially important in participation cases because the danger of over-attribution is high. Joint presence, common communication, friendship, kinship, employment links, and sequential conduct may all look suspicious, but suspicion is not enough. The trial court must identify through lawful evidence whether the defendant jointly realized the offense act, instigated the offense, aided it in one of Article 39’s listed ways, or did neither. Article 230’s reasoning requirement is therefore critical. A conviction that simply says “the defendants acted together” without explaining the exact legal category and evidentiary basis is vulnerable under Turkish law.
The judgment rules in Article 223 of the Code confirm this structure. That article states that acquittal is required, among other cases, where the charged act is not defined as a crime, where it is established that the defendant did not commit the offense, where the defendant lacked intent or negligence for the charged offense, where a justification ground existed, or where it is not proven that the defendant committed the charged offense. In participation cases, these acquittal routes are highly important. A defendant may be acquitted because the prosecution failed to prove any participation at all, because it proved the wrong participation category, because the mental state was not established, or because the supposed principal act was itself justified.
Practical defense issues in participation cases
From a defense perspective, the first task in any multi-defendant file is to force the prosecution and the court to identify the exact participation category. Too many indictments and judgments describe a shared event but fail to say whether the defendant is being treated as a co-perpetrator under Article 37, an indirect perpetrator under Article 37(2), an instigator under Article 38, or an aider under Article 39. That ambiguity is not harmless. Each category has different elements and, in ordinary cases, different sentencing consequences. A proper defense should insist on precise legal labeling.
The second practical issue is overuse of joint-perpetrator language. Because Article 37 punishes each person who jointly realizes the statutory act as a principal, prosecutors sometimes try to place all visible actors in that category. But Article 39 exists for a reason. The Code distinguishes between joint realization of the offense act and acts that facilitate, encourage, guide, or support. A strong defense will often seek to downgrade an alleged principal-perpetrator role to aider status, or eliminate participation entirely where the facts do not even satisfy Article 39.
The third practical issue is proof of instigation. Because Article 38 imposes the penalty of the committed offense on the instigator, courts should not accept instigation lightly. Defense counsel should challenge whether the alleged principal already had the criminal plan, whether the supposed instigating statement is actually proved, and whether the prosecution has confused hierarchy, influence, or post-event approval with legally meaningful instigation. In many cases, the evidence may fit aiding more plausibly than instigation, or may not support either category at all.
The fourth practical issue is special offenses. Where the charged offense can be committed only by a person with a particular legal status, Article 40(2) becomes decisive. Defense counsel should ask whether the client actually possessed the special perpetrator quality. If not, principal liability may already be legally barred, even if some form of participation remains conceivable. This can radically alter the structure of the case and the sentencing framework.
The fifth practical issue is abandonment and distancing. In group cases, evidence often shows that one participant stepped back, warned others, refused to continue, or tried to prevent completion. Article 41 exists precisely for that scenario. Defense counsel should not let such facts disappear into a generic “the group acted together” narrative. If the client voluntarily abandoned and meets the statutory conditions, Turkish law requires that to be assessed individually.
Conclusion
Participation, aiding, and joint criminal liability in Turkey are governed by a carefully structured statutory regime rather than by a vague concept of shared guilt. Article 37 regulates principal and joint perpetration, including indirect perpetration through another person. Article 38 governs instigation and generally punishes the instigator with the penalty of the committed offense. Article 39 governs aiding and defines its main forms while applying a lower punishment structure in ordinary cases. Article 40 supplies the accessory rule, preserves the personal nature of liability, limits principal liability in special offenses, and requires the offense to have reached at least the attempt stage. Article 41 individualizes voluntary abandonment in multi-actor crimes. Read together with Articles 2, 20, 21, 35, and 36 of the Penal Code, and with Articles 206, 217, 223, and 230 of the Code of Criminal Procedure, these provisions show that Turkish law insists on precision: the court must identify what role the accused actually played, prove it with lawful evidence, and explain it in a reasoned judgment. That is why participation doctrine remains one of the most important safeguards against both under-punishment of true accomplices and over-punishment of people who were merely near the event.
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