Contracts Law
This section covers the core institutions of the law of obligations — from contract formation to termination, from performance to adaptation. The articles are prepared in light of the Turkish Code of Obligations (No. 6098).
Penalty Clause: Types, Validity and the Court of Cassation's Approach
Application of the penalty clause under TBK m.179-182
What is a penalty clause and what are its types? Alternative, additional and recissory penalty clauses, and reduction of excessive penalties under TBK m.179-182.
A penalty clause (ceza koşulu) is a sum agreed in advance that the debtor undertakes to pay the creditor in the event of non-performance or improper performance. Regulated in TBK m.179-182, it operates both as a deterrent and as a tool that eases the creditor's burden of proving damages.
Three Types of Penalty Clause — TBK m.179
Alternative penalty (TBK m.179/1): stipulated for non-performance or improper performance. Unless the contract provides otherwise, the creditor may demand either performance or the penalty; not both. Where performance remains possible, performance must be requested in priority.
Penalty additional to performance (TBK m.179/2): stipulated for failure to perform at the agreed time or place. The creditor may demand both performance and the penalty; delay penalties and damages for late delivery are typically of this kind.
Recissory (withdrawal) penalty (TBK m.179/3): the debtor reserves the right to rescind by paying the penalty. After paying, the debtor is released from performance; the creditor cannot demand performance.
Independence from Actual Damage — TBK m.180
The creditor may demand the agreed penalty even without having suffered any damage (TBK m.180/1). This is the key feature distinguishing the penalty clause from classical damages: the creditor need not prove the damage.
However, if the creditor's actual damage exceeds the penalty, the excess can be demanded only on proof of the debtor's fault (TBK m.180/2). The penalty thus operates as a guaranteed minimum; it accrues to the creditor even where the actual damage is less.
Reduction of Excessive Penalties — TBK m.182/3
The court reduces, on its own motion, a penalty it finds excessive (TBK m.182/3). This rule is mandatory; the parties cannot waive it in advance. The Court of Cassation evaluates the amount of the penalty, the debtor's economic position, the value of the performance and the gravity of fault.
The position differs for contracts between merchants. Under TCC m.22, a debtor who is a merchant cannot demand reduction of an excessive penalty; however, the provisions on contracts contrary to morals (TBK m.27) are reserved. Penalty rates must therefore be set carefully from the outset in B2B contracts.
Relationship to the Principal Obligation and Validity
The penalty clause is accessory to the principal obligation. If the principal obligation is invalid or has been extinguished, the penalty produces no effect (TBK m.182/1). If the principal obligation is later extinguished, the penalty falls with it; however, in delay penalties, the creditor's acceptance of performance must reserve the right to the penalty.
Special limitations apply in labour law: a penalty stipulated solely in favour of the employer breaches reciprocity, and unilateral penalty clauses in employment contracts are frequently held invalid by the Court of Cassation's 9th Civil Chamber.
Practical Considerations
In contractual disputes, not only the signed text but also offer correspondence, revision history, invoices, delivery records, payment records, formal notices and the parties' subsequent conduct are taken into account. The formation, performance and termination of a contract often acquire meaning only through these ancillary documents.
Form requirements, authority of representation, penalty clauses, exclusion-of-liability provisions, standard terms and consumer-protection rules may all affect the validity or enforceability of a contract. In standard-form documents in particular, the other party must be informed, express acceptance obtained, and onerous provisions specifically highlighted.
Before any dispute arises, the scope of obligations, delivery date, defect notice, default notice, interest and competent-court clauses should be drafted explicitly. Vague provisions may give rise to interpretation disputes and to difficulties of proof later on.
Relevant Statutory Provisions
- TBK m.179Types of penalty clause
Original (Turkish, official):
MADDE 179- Bir sözleşmenin hiç veya gereği gibi ifa edilmemesi durumu için bir ceza kararlaştırılmışsa, aksi sözleşmeden anlaşılmadıkça alacaklı, ya borcun ya da cezanın ifasını isteyebilir. Ceza, borcun belirlenen zaman veya yerde ifa edilmemesi durumu için kararlaştırılmışsa alacaklı, hakkından açıkça feragat etmiş veya ifayı çekincesiz olarak kabul etmiş olmadıkça, asıl borçla birlikte cezanın ifasını da isteyebilir. Borçlunun, kararlaştırılan cezayı ifa ederek sözleşmeyi, dönme veya fesih suretiyle sona erdirmeye yetkili olduğunu ispat etme hakkı saklıdır.
English summary (non-binding):
Where a penalty is stipulated for non-performance or improper performance, the creditor may, unless the contract provides otherwise, demand either performance or the penalty. Where the penalty is stipulated for failure to perform at the agreed time or place, the creditor — unless it has expressly waived the right or accepted performance without reservation — may demand both performance and the penalty. The debtor's right to prove that, by paying the penalty, it is authorised to bring the contract to an end by rescission or termination is reserved.
Source: mevzuat.gov.tr · last reviewed: 2026-05-12
- TBK m.180Penalty clause and damage
Original (Turkish, official):
MADDE 180- Alacaklı hiçbir zarara uğramamış olsa bile, kararlaştırılan cezanın ifası gerekir. Alacaklının uğradığı zarar kararlaştırılan ceza tutarını aşıyorsa alacaklı, borçlunun kusuru bulunduğunu ispat etmedikçe aşan miktarı isteyemez.
English summary (non-binding):
The penalty agreed upon is payable even if the creditor has suffered no damage. Where the creditor's actual damage exceeds the agreed penalty, the excess can be demanded only on proof of the debtor's fault.
Source: mevzuat.gov.tr · last reviewed: 2026-05-12
- TBK m.181Application of penalty rules to performed portion on rescission
Original (Turkish, official):
MADDE 181- Ceza koşuluna ilişkin hükümler, dönme durumunda ifa edilmiş olan kısmın alacaklıya kalacağını öngören sözleşmelere de uygulanır. Taksitle satışa ilişkin hükümler saklıdır.
English summary (non-binding):
The provisions on penalty clauses also apply to contracts providing that, in case of rescission, the part already performed remains with the creditor. Provisions on instalment sales are reserved.
Source: mevzuat.gov.tr · last reviewed: 2026-05-12
- TBK m.182Amount, invalidity and reduction of the penalty
Original (Turkish, official):
MADDE 182- Taraflar, cezanın miktarını serbestçe belirleyebilirler. Asıl borç herhangi bir sebeple geçersiz ise veya aksi kararlaştırılmadıkça sonradan borçlunun sorumlu tutulamayacağı bir sebeple imkânsız hâle gelmişse, cezanın ifası istenemez. Ceza koşulunun geçersiz olması veya borçlunun sorumlu tutulamayacağı bir sebeple sonradan imkânsız hâle gelmesi, asıl borcun geçerliliğini etkilemez. Hâkim, aşırı gördüğü ceza koşulunu kendiliğinden indirir.
English summary (non-binding):
The parties may freely determine the amount of the penalty. If the principal obligation is for any reason invalid, or — unless otherwise agreed — has subsequently become impossible for reasons not attributable to the debtor, the penalty cannot be demanded. Invalidity or subsequent non-attributable impossibility of the penalty itself does not affect the validity of the principal obligation. The judge reduces, of his or her own motion, a penalty found excessive.
Source: mevzuat.gov.tr · last reviewed: 2026-05-12
- TTK m.22Merchants cannot seek reduction of an excessive penalty
Original (Turkish, official):
MADDE 22- (1) Tacir sıfatını haiz borçlu, Türk Borçlar Kanununun 121 inci maddesinin ikinci fıkrasıyla 182 nci maddesinin üçüncü fıkrasında ve 525 inci maddesinde yazılı hâllerde, aşırı ücret veya ceza kararlaştırılmış olduğu iddiasıyla ücret veya sözleşme cezasının indirilmesini mahkemeden isteyemez.
English summary (non-binding):
A debtor who is a merchant cannot, in the cases listed in TCO m.121/2, m.182/3 and m.525, request the court to reduce a wage or contractual penalty on the ground that it is excessive.
Source: mevzuat.gov.tr · last reviewed: 2026-05-12
- TBK m.27Absolute nullity for contracts contrary to morals
Original (Turkish, official):
MADDE 27- Kanunun emredici hükümlerine, ahlaka, kamu düzenine, kişilik haklarına aykırı veya konusu imkânsız olan sözleşmeler kesin olarak hükümsüzdür. Sözleşmenin içerdiği hükümlerden bir kısmının hükümsüz olması, diğerlerinin geçerliliğini etkilemez. Ancak, bu hükümler olmaksızın sözleşmenin yapılmayacağı açıkça anlaşılırsa, sözleşmenin tamamı kesin olarak hükümsüz olur.
English summary (non-binding):
Contracts contrary to mandatory rules, morals, public order or personality rights, or whose subject matter is impossible, are absolutely null. Nullity of some provisions does not affect the others; however, if it is clear that the contract would not have been concluded without them, the entire contract is null.
Source: mevzuat.gov.tr · last reviewed: 2026-05-12
The statutory provisions are reproduced for information purposes only. The current and official text on mevzuat.gov.tr is authoritative.
Conclusion
When properly drafted, the penalty clause is a powerful security for the creditor. Clearly designating the type, keeping the amount reasonable, and observing the special limits in employment and consumer contracts prevent later disputes over reduction or invalidity.
This article is for information purposes only and does not constitute legal advice. If you would like professional assistance on a specific matter, you may request a consultation.
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