Learn how hardship and adaptation of contracts work under Turkish law, including Article 138 of the Turkish Code of Obligations, excessive difficulty of performance, judicial adaptation, rescission, termination, foreign currency debts, force majeure, and practical drafting risks.
Introduction
Hardship and adaptation of contracts in Turkey have become one of the most important subjects in modern contract practice. Long-term commercial relationships are frequently affected by currency shocks, supply-chain disruptions, extraordinary regulatory changes, inflation, sudden import restrictions, energy crises, logistics failures, and geopolitical developments. Yet Turkish law does not treat every commercial difficulty as a reason to walk away from a contract. The legal analysis is more disciplined. The main framework is found in the Turkish Code of Obligations No. 6098, especially Article 138 on excessive difficulty of performance, together with Articles 112, 117 to 126, and 136 to 137, which regulate non-performance, default, impossibility, and partial impossibility.
In practice, parties often describe a disruptive event as “force majeure,” “hardship,” “economic impossibility,” or “commercial frustration” without distinguishing between these concepts. Under Turkish law, however, these are not interchangeable labels. A contract may become impossible to perform, partially impossible, excessively burdensome, or merely late in performance. Each category produces different legal consequences. Sometimes the obligation ends. Sometimes the contract survives but can be judicially adapted. Sometimes the creditor may insist on performance and claim damages. Sometimes the contract may be rescinded or terminated, but only after statutory conditions are met.
For that reason, the real question in Turkish-law hardship disputes is not whether circumstances became difficult in a general sense. The real question is whether the situation satisfies the statutory conditions of Article 138, whether the contract itself allocates the risk differently, whether performance has already taken place, and whether the relationship is a one-off reciprocal exchange or a continuous-performance arrangement. These issues determine whether the debtor may seek adaptation of the contract, rescission, or termination, and whether the creditor can still invoke default-based remedies.
This guide explains hardship and adaptation of contracts in Turkey in practical English. It focuses on the legal structure of Article 138, the difference between hardship and impossibility, the relationship between hardship and force majeure clauses, the consequences for long-term contracts, the impact on foreign currency debts, and the practical risks that businesses should consider when drafting or litigating Turkish-law contracts.
The Legal Basis: Article 138 of the Turkish Code of Obligations
The central rule is Article 138 of the Turkish Code of Obligations. It states that if, after the contract is made, an extraordinary event occurs that was not foreseen and could not reasonably have been foreseen by the parties, arises from a cause not attributable to the debtor, and changes the facts existing at the time of contract formation to such an extent that demanding performance from the debtor would be contrary to the rules of honesty, the debtor may request the judge to adapt the contract to the new conditions. If adaptation is not possible, the debtor may rescind the contract; in continuous-performance contracts, the debtor generally uses termination instead of rescission. The same article expressly states that this rule also applies to foreign currency debts.
This wording is extremely important because it shows that Turkish law does not treat hardship as an automatic self-help defense. Article 138 does not say that the debtor may simply stop performing whenever circumstances worsen. It builds a structured judicial remedy. The primary solution is adaptation, not immediate dissolution. Only where adaptation is not possible does the law move toward rescission or termination. That feature makes Turkish hardship law both flexible and conservative: it protects the contractual equilibrium, but it does not lightly release parties from their bargains.
The article also reveals a strong connection between hardship and fairness. The statutory test is not merely whether performance became more expensive or less profitable. The test is whether the change became so serious that insisting on performance would be contrary to the rules of honesty. As a practical inference from the text, ordinary market fluctuation, bad business judgment, or a contract turning economically unattractive will not by themselves satisfy Article 138. The statutory threshold is built around extraordinary change and serious imbalance, not routine commercial risk.
The First Condition: An Extraordinary and Unforeseeable Event
The first major requirement under Article 138 is the occurrence of an extraordinary event that was not foreseen when the contract was concluded and could not reasonably have been expected to be foreseen. This is a strict threshold. Turkish law does not allow parties to re-open contracts merely because circumstances evolved in a difficult direction. The event must be outside the normal commercial horizon of the contract at the time it was made.
This requirement matters especially in inflationary or volatile sectors. In practical terms, a party entering a contract in a market already known for instability may face a harder argument on foreseeability than a party confronted by a truly exceptional disruption. That conclusion follows from the statutory emphasis on what the parties did not foresee and were not expected to foresee at formation. Turkish courts therefore look backward to the contract date and ask what kind of risk was objectively inside the bargain from the beginning.
The legal consequence is clear: a hardship claim in Turkey should be built not only on the severity of the later event, but also on the contract formation context. The stronger the evidence that the event was genuinely beyond ordinary contractual risk at the time of signature, the stronger the Article 138 argument becomes.
The Second Condition: The Event Must Not Be Attributable to the Debtor
Article 138 also requires that the extraordinary event arise from a cause not attributable to the debtor. Turkish law does not permit a party to rely on hardship where the relevant difficulty was caused, aggravated, or assumed by that same party. This fits the broader structure of the Code of Obligations, which places contractual liability at the center unless the debtor can establish a legally recognized excuse. Article 112 provides that if the obligation is not performed at all or is not properly performed, the debtor must compensate the creditor’s loss unless it proves that no fault is attributable to it.
That interaction between Articles 112 and 138 is practically important. Hardship is not a shortcut for escaping the debtor’s own commercial or operational failures. If the debtor created the disruption, failed to hedge an assumed risk, ignored obvious exposure, or worsened the difficulty through its own conduct, the hardship argument becomes substantially weaker. As a practical inference, Turkish-law adaptation claims work best where the causal chain points clearly away from the debtor and toward an external, exceptional development.
The Third Condition: Fundamental Change in the Contractual Equilibrium
Article 138 requires more than an extraordinary event. The event must change the facts existing at the time of the contract so significantly that demanding performance from the debtor would be contrary to the rules of honesty. This is the heart of the doctrine. Turkish law is not protecting the debtor against inconvenience; it is protecting the contractual balance against a radical distortion.
This means the hardship inquiry is intensely contextual. The court will not look only at market-wide events in the abstract. It will ask what the contract originally assumed, how the event altered the economic or operational basis of that assumption, and whether performance under the original terms still remains tolerable within the logic of good faith. In practice, the more clearly the claimant can show a sharp disruption between the original bargain and the new conditions, the stronger the adaptation claim becomes.
It also means that hardship in Turkey is not identical to loss of profitability. A party that still can perform but at a lower margin or under tougher commercial conditions may not necessarily meet the statutory threshold. The article requires a deeper imbalance: performance must become so burdensome that enforcing the original bargain would contradict the rules of honesty.
The Fourth Condition: The Debtor Must Not Have Fully Performed Without Reservation
Article 138 contains another crucial condition: the debtor must either not yet have performed, or must have performed while reserving the rights arising from the excessive difficulty of performance. This is a highly practical rule because it prevents parties from fully performing without reservation and only later attempting to reopen the bargain under hardship theory.
In other words, Turkish law expects procedural consistency from the disadvantaged party. If performance continues despite the extraordinary change, the party should expressly reserve its rights. Otherwise, the conduct may be treated as acquiescence to the altered circumstances. For lawyers and businesses, this means that written reservations, contemporaneous notices, and documented objections are not mere formalities. They can be decisive in preserving the Article 138 remedy.
Adaptation Is the Primary Remedy
One of the defining features of Turkish hardship law is that adaptation comes first. Article 138 expressly gives the debtor the right to ask the judge to adapt the contract to the new conditions. This makes Turkish law more nuanced than systems that focus only on discharge or frustration. The aim is to save the contract if possible by restoring fairness under the new reality.
Adaptation can take many practical forms depending on the contract. In a supply agreement, it may involve price revision, delivery rescheduling, or quantity adjustment. In a lease-like economic arrangement, it may involve recalibration of the payment burden. In a long-term services or infrastructure contract, it may involve timing revision, staged performance, or rebalancing of cost allocation. These are examples by inference from the statutory adaptation power; Article 138 itself does not list a closed set of judicial techniques.
This adaptation-first structure is especially important for commercial stability. Turkish law does not assume that every serious disruption should destroy the contract. Instead, it gives the court a corrective role aimed at preserving the contractual relationship where that remains possible in a fair form.
When Adaptation Is Not Possible: Rescission and Termination
Article 138 then provides a secondary remedy. If adaptation is not possible, the debtor may rescind the contract. In continuous-performance contracts, however, the debtor generally uses termination instead of rescission. This distinction matches the broader remedial structure of the Turkish Code of Obligations.
That difference matters because rescission and termination do not operate identically under Turkish law. In reciprocal one-off contracts, rescission is tied more strongly to the unwinding of the exchange. In continuous-performance relationships, termination works prospectively and is a more natural fit for ongoing obligations. Article 126 separately confirms that in continuous-performance contracts where the debtor falls into default, the creditor may terminate and seek the damage caused by the premature end of the relationship. Article 138 follows the same logic by preferring termination rather than rescission for continuous-performance hardship cases.
As a practical matter, this means the contract type matters from the beginning. A hardship analysis for a construction milestone contract, a one-off sale, a long-term distributorship, a services framework, and a lease-style economic arrangement will not always end at the same remedy even if the disruptive event is similar.
Foreign Currency Debts Are Expressly Included
One of the most commercially significant parts of Article 138 is its final sentence, which states that the provision also applies to foreign currency debts. This is especially important in Turkish contract practice because exchange-rate volatility is one of the most common triggers for hardship arguments.
The statutory text does not say that every increase in exchange-rate burden automatically justifies adaptation. It says that foreign currency debts are not excluded from Article 138. So the debtor must still satisfy the same full test: extraordinary and unforeseeable event, non-attributable cause, serious distortion of the contractual equilibrium, and no completed performance without reservation. The foreign-currency sentence broadens the field of application, but it does not abolish the threshold.
This makes Article 138 a central tool in Turkish-law disputes involving rent indexed to foreign currency, import-based supply contracts, financing-linked obligations, and cross-border commercial deals. Yet it remains a structured judicial remedy, not an automatic rate-correction mechanism.
Hardship Is Not the Same as Impossibility
Hardship under Article 138 must be distinguished from impossibility under Articles 136 and 137. Article 136 states that if performance becomes impossible for reasons for which the debtor cannot be held responsible, the obligation ends. In reciprocal contracts, the debtor released from performance must return what it received under unjust-enrichment rules and loses the right to demand any counter-performance not yet rendered. The same article also requires the debtor to notify the creditor without delay and take necessary measures to prevent further loss; otherwise, the debtor must compensate the resulting damage.
Article 137 deals with partial impossibility. If only part of the performance becomes impossible for reasons not attributable to the debtor, the debtor is released only from that part, unless it is clear that the parties would not have made the contract had they foreseen the partial impossibility. In reciprocal contracts, if the creditor accepts partial performance, the counter-performance is reduced proportionally; if the creditor does not accept partial performance, or if the counter-performance is indivisible, the total impossibility rules apply.
The difference is decisive. Impossibility extinguishes the obligation where performance cannot be carried out. Hardship does not extinguish the obligation immediately. It opens the path to adaptation and only secondarily to rescission or termination. In practice, many parties misclassify their case. A contract that is still performable, though extremely burdensome, usually belongs to Article 138, not Article 136.
Hardship Is Also Different From Ordinary Default
Hardship must also be distinguished from ordinary debtor default. Article 117 states that the debtor of a due obligation falls into default upon creditor notice, unless the due date was jointly fixed or properly fixed through a contractual mechanism, in which case default arises automatically when the day passes. Articles 123 to 126 then regulate additional cure periods, exceptions to cure periods, election of remedies, rescission, and termination in reciprocal and continuous-performance contracts.
This means that not every difficult-performance case should be presented as hardship. Where performance is still fully possible and the event does not satisfy Article 138, the ordinary law of delay and breach may apply. The creditor may grant a cure period, insist on performance, claim delay damages, or in the appropriate circumstances move toward rescission or termination. Turkish law therefore requires parties to classify the disruption correctly before choosing their legal theory.
Contract Drafting Matters: Hardship Clauses, Force Majeure Clauses, and Risk Allocation
Article 26 of the Turkish Code of Obligations allows parties to determine the content of their contract freely within legal limits, and Article 27 invalidates clauses that violate mandatory law, public order, morality, personal rights, or involve impossible subject matter. This means parties may include hardship clauses, renegotiation clauses, force majeure clauses, economic rebalance mechanisms, indexation formulas, cost-sharing provisions, and stepped termination rights in Turkish-law contracts.
That drafting freedom is commercially important because Article 138 is a statutory safety valve, but sophisticated parties often want more detail than the statute alone provides. A strong Turkish-law hardship clause should define triggering events, require prompt written notice, regulate documentary proof, establish a renegotiation timetable, coordinate with force majeure language, specify whether performance is suspended during negotiations, and address what happens if rebalancing fails. These are drafting recommendations by practical inference from Articles 26, 27, and 138, rather than direct code wording.
The main risk is vagueness. A contract that merely says “hardship shall be considered by the parties in good faith” may do little to reduce litigation. Turkish law already contains a statutory hardship regime. Contractual language is most useful when it clarifies procedure, evidence, timing, and interim rights.
Consumer Contracts Need Extra Caution
Where the contract is consumer-facing, hardship or rebalancing language must also be assessed against consumer-protection law. Article 5 of the Consumer Protection Law defines unfair terms as non-negotiated clauses that create an imbalance against the consumer contrary to good faith, states that such terms are definitively invalid, and places the burden of proving individual negotiation on the party that drafted the standard term. It also requires written consumer terms to be clear and understandable, and ambiguous terms are interpreted in favor of the consumer.
This does not mean hardship clauses are forbidden in consumer contracts. It means one-sided clauses that allow only the trader to reprice, suspend, or escape performance in vaguely defined extraordinary circumstances may face unfair-term scrutiny. Turkish law accepts contractual adjustment mechanisms, but in consumer settings those mechanisms must be transparent and balanced enough to survive Article 5 review.
Practical Litigation and Evidence Considerations
A successful hardship case under Turkish law is usually evidence-heavy. Because Article 138 contains multiple cumulative conditions, the claimant should be prepared to show the contractual assumptions at formation, the extraordinary nature of the later event, the absence of debtor fault, the scale of the change, the reason demanding literal performance became contrary to honesty, and the timing of any reservation of rights. This follows directly from the statutory structure of the article.
In practice, contemporaneous documents matter. Negotiation records, market data, regulatory acts, correspondence, reservation notices, payment records, and expert financial analysis may all become relevant. A hardship argument framed only in general terms is usually weaker than one tied to the specific economic and factual architecture of the contract.
If the dispute is commercial and also includes payment or compensation claims, the Turkish Commercial Code’s mediation rule may become relevant. Article 5/A states that in commercial cases concerning monetary receivables and compensation claims, applying to a mediator before filing suit is a condition of action. Pure adaptation claims and mixed claims should therefore be analyzed procedurally with care before litigation is commenced.
Conclusion
Hardship and adaptation of contracts in Turkey are governed primarily by Article 138 of the Turkish Code of Obligations. The article offers a carefully structured remedy for extraordinary, unforeseeable, non-attributable events that fundamentally upset the contractual equilibrium and make literal performance contrary to the rules of honesty. Its primary remedy is judicial adaptation. Only where adaptation is not possible does the law move toward rescission or, in continuous-performance contracts, termination. The article also expressly applies to foreign currency debts.
The doctrine must be kept distinct from impossibility under Articles 136 and 137 and from ordinary default under Articles 117 to 126. Under Turkish law, not every serious commercial difficulty is hardship, and not every disruption excuses performance. The classification of the event determines the remedy.
The practical lesson is straightforward. Parties using Turkish-law contracts should draft risk-allocation clauses carefully, preserve reservations promptly, and analyze extraordinary events through the exact language of the Code rather than through loose commercial vocabulary. In Turkey, the strongest hardship claim is not the loudest one. It is the one that fits Article 138 precisely.
FAQ
What is hardship under Turkish law?
Hardship is regulated mainly by Article 138 of the Turkish Code of Obligations. It applies where an extraordinary and unforeseeable event, arising from a cause not attributable to the debtor, changes the circumstances so seriously that demanding performance would be contrary to the rules of honesty.
Does hardship automatically terminate the contract?
No. Under Article 138, the primary remedy is judicial adaptation of the contract to the new conditions. Only if adaptation is not possible may the debtor rescind the contract, or terminate it in continuous-performance contracts.
Can Article 138 be used for foreign currency debts?
Yes. Article 138 expressly states that it also applies to foreign currency debts.
What is the difference between hardship and impossibility?
Impossibility under Article 136 ends the obligation where performance becomes impossible for reasons not attributable to the debtor. Hardship under Article 138 applies where performance is still possible but has become excessively difficult and unfair to demand under the original terms.
What if only part of the performance becomes impossible?
Article 137 provides that the debtor is released only from the impossible part, unless it is clear the parties would never have entered into the contract had they foreseen the partial impossibility. In reciprocal contracts, the counter-performance is generally reduced proportionally if partial performance is accepted.
Can a party rely on hardship after fully performing?
Usually not, unless the party performed while expressly reserving its rights arising from the excessive difficulty of performance. Article 138 requires that the debtor either not yet have performed or have performed with reservation.
Are hardship clauses in consumer contracts always enforceable?
No. In consumer contracts, Article 5 of the Consumer Protection Law invalidates unfair non-negotiated terms that create an imbalance against the consumer contrary to good faith, and ambiguous written terms are interpreted in the consumer’s favor.
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