Learn how set-off, netting, and payment adjustment mechanisms work under Turkish law, including statutory set-off requirements, contractual netting, current account structures, insolvency-related issues, protected claims, and drafting strategies for Turkish contracts.
Introduction
Set-off, netting, and payment adjustment mechanisms under Turkish law are among the most practical tools for managing payment risk in commercial relationships. They matter in supply contracts, service agreements, construction projects, distribution arrangements, loan and settlement structures, multi-invoice trading relationships, and financial-market infrastructure. In simple terms, these mechanisms allow parties to reduce gross exposure, avoid unnecessary circular payments, and convert multiple reciprocal claims into a smaller net balance. But Turkish law does not treat all of these mechanisms as identical. The rules on statutory set-off are found primarily in the Turkish Code of Obligations, while current account netting is regulated separately in the Turkish Commercial Code, and system-level netting in payment and securities settlement systems is protected by a different statute altogether.
This distinction is important because commercial language often blurs the concepts. Parties may use the words “set-off,” “netting,” “deduction,” “holdback,” “true-up,” “payment adjustment,” or “close-out” almost interchangeably. Turkish law is more precise. A bilateral set-off between two mature money claims is not the same as a current-account mechanism that defers separate collection until an account period is closed, and neither of those is the same as netting within a regulated payment or securities settlement system. The legal basis, the requirements, and the consequences differ.
That is why the real legal question is not whether the contract contains a “netting” clause. The real questions are whether the parties have reciprocal claims that are legally eligible for set-off, whether a contractual netting structure is validly formed, whether certain claims are protected against set-off, whether insolvency changes the analysis, and whether the contract uses payment-adjustment language in a way that Turkish law will actually recognize and enforce. This article explains set-off, netting, and payment adjustment mechanisms under Turkish law in practical English and with a focus on drafting, enforceability, and dispute risk.
The Legal Foundation: Contract Freedom and Mandatory Limits
The basic starting point is Article 26 of the Turkish Code of Obligations, which allows parties to determine the content of a contract freely within the limits laid down by law. This is what makes contractual payment-adjustment language, netting structures, true-up clauses, and holdback mechanics generally possible in Turkish law. But Article 27 immediately adds the outer boundary: contracts contrary to mandatory law, morality, public order, personal rights, or impossible subject matter are definitively void. In practical terms, parties have broad room to allocate payment risk, but they cannot do so in a way that defeats mandatory statutory protections.
This matters because set-off and netting are partly statutory and partly contractual in Turkey. The statute supplies a default set-off regime. Contract freedom then allows the parties to expand operational mechanisms around payment adjustment, invoicing, periodic settlement, and account balancing. But protected claims, exclusive statutory regimes, and mandatory commercial or consumer rules may still intervene. So Turkish law does not approach payment adjustment as a purely private drafting exercise. It is a mixed regime in which contractual design and mandatory law operate together.
Statutory Set-Off Under the Turkish Code of Obligations
The core statutory rules are in Articles 139 to 145 of the Turkish Code of Obligations. The basic rule appears in Article 139. If two persons owe each other a sum of money or other fungible obligations of the same kind, and both debts are due and payable, each party may set off its claim against its debt. The same article also states that set-off may be asserted even if one of the claims is disputed, and that a time-barred claim may still be used for set-off only if it had not yet become time-barred at the time when set-off first became possible.
This rule contains the main building blocks of Turkish statutory set-off. First, there must be reciprocity: the parties must be debtor and creditor of each other. Second, the claims must concern money or homogeneous fungible performance. Third, both claims must generally be mature. Those are not technical side issues. They are the essential conditions that distinguish a real statutory set-off from a mere argument that one party would prefer not to pay. If any of those elements is missing, statutory set-off becomes much harder to sustain.
One of the most commercially useful aspects of Article 139 is that a claim does not lose its set-off value merely because it is disputed. In practice, that means a debtor may still raise set-off even where the opposing party contests the underlying receivable. This can be strategically important in litigation and enforcement because it allows a party to reduce apparent exposure without first having converted every claim into an uncontested or adjudicated amount. Turkish law therefore takes a relatively practical approach to the disputed-claim problem.
The rule on limitation periods is equally important. A claim that later becomes time-barred may still be used for set-off if it was still timely when the conditions for set-off first arose. That can be decisive in long-running commercial relationships where invoices, credits, rebates, and counterclaims accumulate over time. A party that believes its claim is too old to matter may still discover that it retains defensive value through set-off under Article 139.
Set-Off and the Need for a Declaration
Turkish law does not make set-off automatic in every case. Article 143 states that set-off takes effect only when the debtor declares its intention to set off to the creditor. Once that declaration is made, both debts are extinguished up to the amount of the smaller debt as of the moment when they first became eligible for set-off. The same provision also preserves special commercial customs relating to current accounts.
This is a key practical point. Turkish statutory set-off is not merely a background economic reality. It is a legal mechanism that generally requires a set-off statement. A party that has a reciprocal claim but never communicates set-off may not achieve the desired legal effect when payment becomes disputed. In practice, contracts should therefore deal with notice mechanics, and parties should be disciplined about how and when they declare set-off if they want the extinguishing effect of Article 143.
The effect of the declaration is also important. Turkish law treats the debts as extinguished not only from the date of the declaration, but by reference to the point when the debts first became capable of being set off. This helps explain why set-off can be so powerful in disputes over default interest, maturity, and remaining balance. Once validly declared, it can reshape the underlying payment position from the legally relevant eligibility date rather than only from the day the letter was sent.
Special Situations: Suretyship, Third-Party Beneficiary Contracts, and Bankruptcy
The Turkish Code of Obligations also deals with several important special cases. Under Article 140, a surety may refuse performance to the creditor as long as the principal debtor still has the right to assert set-off. This is a significant protective rule because it prevents the creditor from bypassing the principal debtor’s set-off position by moving straight against the surety.
Under Article 141, a person who promised performance to a third-party beneficiary cannot set off that obligation with its own claim against the other contracting party. This preserves the position of the third-party beneficiary and prevents the promisor from undermining the third party’s benefit by relying on a separate cross-claim against the promisee.
Bankruptcy creates another important adjustment. Article 142 states that if the debtor goes bankrupt, creditors may set off their claims against debts owed to the bankrupt estate even if the claims are not yet due. This is a notable insolvency-side facilitation of set-off. It shows that Turkish law recognizes the importance of netting mutual exposure when the ordinary payment structure collapses because of bankruptcy. In practice, this can materially affect insolvency strategy, proof of claims, and the real economic value of receivables.
Claims That Cannot Freely Be Set Off
Turkish law does not make every claim freely set-offable. Article 144 lists claims that, once the right of set-off has arisen, may be set off only with the creditor’s consent. These include claims relating to the return of deposited property or its value, claims relating to the return or value of property wrongfully taken or retained by deceit, and claims such as maintenance and wages, where the claim is essential for the maintenance of the debtor and the debtor’s family and, by its nature, must be paid directly to the creditor.
This provision is highly important in practice because it marks the boundary between ordinary commercial reciprocity and protected claims. A party cannot simply use set-off to neutralize sensitive claims that the law wants delivered directly to the creditor, especially where livelihood or personal protection is at stake. This is one reason why contracts that attempt to impose universal set-off across every category of claim should be drafted cautiously. Turkish law contains protected pockets that party language may not easily displace.
Waiver of Set-Off
Article 145 states that the debtor may waive the right of set-off in advance. This is commercially significant because many contracts, especially financing agreements, supply agreements, and high-control payment structures, include “no set-off” or “payment without deduction” language. Turkish law recognizes that such waivers can be made beforehand.
That does not mean every no-set-off clause will always prevail in every context. Protected claims, good-faith constraints, and sector-specific mandatory rules may still matter. But Article 145 does mean that Turkish law generally accepts advance contractual waiver of the ordinary set-off right. Parties who want gross-payment certainty therefore have a solid statutory basis for drafting no-set-off provisions, and parties accepting such clauses should understand that they may be surrendering an otherwise powerful statutory tool.
Current Account as a Contractual Netting Mechanism
Beyond ordinary set-off, Turkish commercial law contains a more specialized mechanism: the current account (cari hesap). Under Article 89 of the Turkish Commercial Code, a current account agreement is a contract by which two persons mutually waive the separate and individual collection of claims arising from any legal cause or relationship and instead convert them into debit and credit entries, with only the remaining balance being claimable after the account is closed. The statute also requires that the current account agreement be in writing.
This is one of the clearest statutory netting structures in Turkish law. Unlike ordinary set-off, current account is not just a defensive extinction device applied claim by claim. It is a contractual framework for ongoing account-based netting over time. Claims are not pursued separately during the accounting cycle in the ordinary way; instead, they are absorbed into the account structure, and only the balance after closing becomes independently claimable. That makes current account especially useful in long-running trading relationships with recurring two-way flows.
The Turkish Commercial Code also clarifies the effects of current account. Under Article 90, entry into current account does not, unless otherwise agreed, eliminate litigation and defense rights arising from the underlying contract or transaction; if the underlying contract or transaction is invalidated, the relevant entry can be removed from the account. The Code also regulates the treatment of negotiable instruments, balance carry-forward between accounting periods, interest on entries where applicable, and the position of fees and expenses.
Current account law also defines what stays outside the account. Under Article 93, claims that cannot be set off and claims arising from money or goods delivered for a specific purpose or to be held separately at the recipient’s disposal cannot be entered into the current account. This is consistent with the protected-claim logic in the Code of Obligations and shows again that Turkish law does not allow contractual netting to consume every kind of claim indiscriminately.
The balance mechanics are also important. Under Article 94, after each account period the debit and credit entries are balanced and the resulting excess is determined; where no account period is agreed or established by custom, the last day of the calendar year is deemed to be the closing date. The party receiving the balance statement is deemed to have accepted it unless it objects within one month through notarial notice, registered letter, telegram, or a writing with secure electronic signature. This is a powerful evidentiary and operational rule that makes current-account netting much more than an informal bookkeeping habit.
In short, current account is one of the most effective statutory netting structures available under Turkish law, but it only works well if it is properly documented, uses the required written form, and fits a relationship where periodic net-balancing is commercially sensible. It is not just a generic label for “we net things sometimes.” It is a legally structured mechanism with its own rules and effects.
Payment Adjustment Mechanisms Beyond Set-Off
Not every payment-adjustment mechanism in Turkish contracts is a true set-off or netting arrangement. Many contracts use deductions, holdbacks, retentions, true-ups, rebates, credit notes, or performance-based price adjustments. Turkish law generally allows such structures through contract freedom under Article 26, as long as they stay within mandatory limits under Article 27. This means the parties can usually design commercial formulas that adjust the amount payable based on quality deviations, milestone completion, KPI achievement, post-closing working-capital variations, volume rebates, or other agreed metrics.
But these mechanisms should be drafted carefully, because not every deduction is automatically a legal set-off. A contractual price-adjustment formula is usually strongest when it is drafted as part of the primary payment architecture rather than as an afterthought. If the contract clearly says how the payable amount will be calculated, reduced, retained, or reconciled, Turkish law will often treat that as ordinary contractual content. If the clause is vague and later one party tries to characterize it as a unilateral deduction right, the dispute may shift toward whether the deduction is actually permitted or whether a separate set-off declaration was required.
This is why payment-adjustment clauses should usually answer five practical questions: what triggers the adjustment, how the amount is calculated, whether evidence or certification is required, whether the payer may deduct unilaterally or only after notice or acceptance, and what happens if the other side disputes the calculation. Turkish law can support sophisticated adjustment mechanisms, but it favors clarity over improvisation.
Simultaneous Performance and Insecurity as Payment Protection Tools
Payment adjustment under Turkish law is also connected to the law of reciprocal performance. Article 97 of the Turkish Code of Obligations states that, unless a party has the right to perform later under the contract or the nature of the relationship, a party seeking performance of a reciprocal contract must itself have performed or at least offered its own performance. This is the Turkish-law expression of the basic “simultaneous performance” principle. In commercial terms, it functions as a structural payment-control mechanism because a party is not always required to pay first and litigate later.
Article 98 goes further. If, in a reciprocal contract, the other party falls into an inability to perform and the first party’s right is endangered—especially through bankruptcy or failed enforcement—the endangered party may withhold its own performance until adequate security is provided. If proper security is not given within a reasonable time, that party may rescind the contract. This is not set-off in the technical sense, but it is a powerful payment-protection and adjustment mechanism.
These provisions matter because many contracts do not need pure set-off to manage payment risk. Sometimes the better tool is a properly drafted withholding right aligned with Articles 97 and 98. In other words, Turkish law offers not only ex post balancing through set-off, but also ex ante control through reciprocal-performance and insecurity defenses.
Sector-Specific Netting in Payment and Securities Settlement Systems
A separate and highly specialized netting regime exists under Law No. 6493 on Payment and Securities Settlement Systems, Payment Services, and Electronic Money Institutions. This statute does not govern ordinary commercial set-off between two private counterparties. It governs system-level netting in regulated payment and securities settlement infrastructure. The law defines netting as the conversion of multiple transfer obligations into a net position and then protects the system’s functioning against later-disruptive measures.
The key provision here is Article 10. It requires system rules to define the moment when a transfer order becomes irrevocable and provides that, after that point, the transfer order cannot be revoked by a participant or a third person. It also provides that if the system operates on a netting basis, transfer orders that entered the system before notification of certain legal restraint measures are still included in the netting process. The law further provides that funds and securities in the settlement account are used first to satisfy existing system obligations and allows the system operator, within the system rules, to realize collateral without notice, grace period, or prior judicial or administrative approval in the circumstances specified there.
This is a very important distinction for lawyers and commercial parties. Ordinary set-off under the Code of Obligations is one thing. Current-account netting under the Commercial Code is another. System-protected netting under Law No. 6493 is something else again: a statutory stability regime designed for payment and settlement systems. Parties should not assume that a contractual “netting” clause between two private companies automatically enjoys the same protective status that Turkish law gives to regulated system netting.
Dispute Resolution: Mediation and Court Practice
In practice, disputes over set-off, netting, and payment adjustment are often commercial monetary disputes. Under Article 5/A of the Turkish Commercial Code, for commercial cases listed in Article 4 and in other laws, actions whose subject is a monetary receivable, compensation, annulment of objection, negative declaratory relief, or restitution require pre-suit mediation as a condition of action. Commercial cases are, unless otherwise provided, heard by the commercial court of first instance under Article 5 of the same Code.
That matters because set-off is frequently raised in commercial collection disputes, invoice litigation, current-account balance disputes, and negative declaratory actions. A party may have a strong position on the merits and still lose time procedurally if it files in court without satisfying the mediation requirement where it applies. Payment-adjustment clauses should therefore be drafted not only with substantive clarity, but also with procedural realism in mind.
If the parties want to choose a Turkish court contractually, the HMK also matters. Under Articles 17 and 18 HMK, merchants and public legal entities may agree in writing on one or more competent Turkish courts for a specific or determinable legal relationship, so long as the matter is disposable and not subject to exclusive jurisdiction. This can be useful in sophisticated B2B payment structures, but the statutory requirements should be respected carefully.
Practical Drafting Guidance
A strong Turkish-law drafting approach should first decide which mechanism is actually being used. If the parties want a classic mutual extinction of due claims, the contract should use a set-off clause and address notice, scope, excluded claims, and waiver. If the parties want recurring account-based balancing over time, a current account agreement may be the better tool, but it must be in writing and should regulate account periods, objection procedures, interest, and excluded items. If the parties want operational price corrections rather than legal extinction of separate claims, they should draft a payment-adjustment mechanism rather than using set-off language loosely.
It is also wise to identify protected claims expressly. Wages, maintenance-type claims, deposited-property claims, and deceit-related property-return claims are not freely available for set-off without consent once the right arises. Contracts that ignore these statutory boundaries are more vulnerable than parties often assume.
No-set-off clauses should be drafted consciously. Article 145 allows advance waiver of set-off, so a clause requiring payment “without set-off, deduction, or counterclaim” can have real effect under Turkish law. But the parties should still check whether the clause fits the contract type, the bargaining context, and any mandatory limits. In B2B settings, these clauses can be powerful. In more protected settings, they require more caution.
Finally, if the contract is expected to generate many reciprocal invoices, credits, or performance adjustments, the safest drafting is usually operational, not rhetorical. Define the accounting cycle, the evidence required for adjustments, the deadline for objections, the payment source and currency, and whether disputed amounts are excluded temporarily from netting or included subject to later correction. Turkish law gives parties room to design these systems. The parties should use that room intentionally.
Conclusion
Set-off, netting, and payment adjustment mechanisms under Turkish law are related but not interchangeable concepts. The Turkish Code of Obligations regulates statutory set-off in Articles 139 to 145 and requires reciprocal due money or fungible claims, subject to protected exceptions, a declaration of set-off, and the possibility of advance waiver. The Turkish Commercial Code separately regulates current account as a written contractual netting structure in which claims are converted into debit and credit entries and only the balance after closing is claimed. Law No. 6493 then creates a distinct and more specialized netting regime for regulated payment and securities settlement systems.
The practical takeaway is simple: under Turkish law, the strongest payment-risk mechanism is the one that matches the legal category the parties actually need. A set-off clause should be drafted like a set-off clause, a current-account relationship should be documented like a current-account relationship, and a payment-adjustment mechanism should be built into the primary payment formula instead of being left as a vague deduction right. Contracts that respect those distinctions are much more likely to work when the relationship turns from ordinary accounting to real dispute.
FAQ
Can a party unilaterally set off claims under Turkish law?
Yes, if the statutory conditions of Article 139 are satisfied and the party makes the required set-off declaration under Article 143. The claims must generally be reciprocal, due, and concern money or homogeneous fungible performance.
Can a disputed claim still be used for set-off in Turkey?
Yes. Article 139 expressly states that set-off may be asserted even if one of the claims is disputed.
Can time-barred claims still be used for set-off?
Sometimes. Article 139 allows this only if the claim had not yet become time-barred at the moment when set-off first became possible.
Are there claims that cannot freely be set off?
Yes. Under Article 144, claims relating to deposited property, wrongfully taken or deceitfully retained property, and certain maintenance- and wage-type claims may be set off only with the creditor’s consent once the right arises.
Can parties waive set-off rights in advance?
Yes. Article 145 states that the debtor may waive the right of set-off in advance.
What is a current account under Turkish law?
Under Article 89 of the Turkish Commercial Code, it is a written agreement under which parties stop pursuing reciprocal claims separately and instead record them as debit and credit items, with only the balance after account closing becoming claimable.
Is current account the same as ordinary set-off?
No. Current account is a contractual netting framework for ongoing relationships, while ordinary set-off is a statutory extinction mechanism for eligible reciprocal claims.
Do commercial set-off and netting disputes require mediation first in Turkey?
Often yes. Commercial monetary disputes are generally subject to mandatory pre-suit mediation under Article 5/A of the Turkish Commercial Code.
Yanıt yok