Prohibition of Expanding Claims and Defenses

Practical Examples, Strategy, and "Subsequent Additional Petitions" in Commercial Litigation

1) Concept: What does "expansion/modification" mean?

The prohibition against expanding or modifying claims and defensesis a procedural rule that prevents parties from expanding or altering the form of a case by adding "new facts, new claims, or new grounds for defense" after a certain stage. The aim is to limit surprise moves that prolong the proceedings, to ensure the principle of concentration (gathering claims and defenses at a certain stage), and to protect the opposing party's right to defense. This framework is explicitly established in Article 141 of the Code of Civil Procedure.

1.1. Distinction between "new legal cause" and "new fact"

The most common misunderstanding in commercial litigation is this:

• The court makes the legal classification ex officio. While the plaintiff may invoke the "Turkish Code of Obligations," the court may apply the "Turkish Commercial Code"; while the defendant may raise the defense of "contract," the court may consider it a "tort." In most cases, this does not violate the prohibition; because the target of the prohibition is not the legal label, but the core of the facts/claim/defense.

• Conversely, if the plaintiff a new set of facts (e.g., "there was actually a second contract," "delivery never took place"), this generally carries the risk of expansion/modification.

In short: Deepening a legal argument is often permissible; expanding the set of facts and claims is limited by Article 141 of the Code of Civil Procedure. This distinction is also widely discussed in legal doctrine.

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2) The backbone of Article 141 of the Code of Civil Procedure: At what stage does the prohibition begin?

Article 141/1 of the Code of Civil Procedure establishes the following basic system:

1. The parties may freely expand or modify their claims/defenses with reply and second reply briefs

2. After the submissions have been exchanged , the claims or defenses cannot be expanded or modified.

3. Exceptions: amendment and the explicit consent of the other party are reserved.

2.1. What does "exchange of petitions" mean?

In written procedural law, the typical sequence (in summary) is:
statement of claim → response → reply to the response → second response.

When this chain is complete (or legally deemed complete), the prohibition under Article 141 of the Code of Civil Procedure comes into effect.

2.2. If the defendant does not respond at all, when does the prohibition begin for the plaintiff?

An important detail in practice: If the defendant has not submitted a response, the plaintiff's period to freely expand their claim is not "unlimited." Case law often holds that the plaintiff's right to be subject to this prohibition after the expiration of the response period .

This is critical in commercial litigation: the reflex of "The defendant hasn't responded, so I'll expand the case" can lead to the claim being deemed procedurally invalid if it's taken at the wrong stage.

2.3. Does the same logic apply in simplified trial procedures?

Yes; in practice, there are assessments based on Supreme Court decisions indicating that the logic of Article 141 of the Code of Civil Procedure is also effective in simplified procedure, and that the limits of "expansion/modification" are also observed in simplified procedure.

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3) The “antidotes” to the ban: Explicit consent, reform, uncertain receivables

Article 141/2 of the Code of Civil Procedure lists two key exceptions to the prohibition: amendment and explicit consent.
In commercial litigation, a third "special loophole" is more commonly used: increasing the claim in case of an uncertain receivable (Article 107/2 of the Code of Civil Procedure).

3.1. Explicit consent of the other party

It must be "explicit": Implicit/silent acceptance is often not considered sufficient. Therefore, in commercial litigation, explicit consent obtained through correspondence or interim hearing minutes with the opposing party (e.g., "we consent to the plaintiff increasing the amount of their claim") is the safest approach.

When is it preferred?

• If the case is close to a settlement/payment,

• If the increase in demand is a technical/calculatory adjustment,

• If the other party is in a position to say, "I already knew that.".

3.2. Reform (Articles 176 and subsequent articles of the Code of Civil Procedure) – “one-shot” strategy

Article 176 of the Code of Civil Procedure stipulates that parties may amend their procedural actions, in whole or in part; and that, as a rule, only one amendment may be made in the same case.

Amendment is often used in commercial litigation for the following purposes:

• Increasing the amount of the claim (partial claim/account difference),

• Expanding the type of claim (adding a penalty clause/damage item instead of just a receivable),

• "Reconstructing" the case file (risky; may have consequences depending on the judge's assessment).

Important: Issues such as when amendments can be made during the proceedings and amendments after reversal have been subject to debate in case law and Constitutional Court decisions; there are also Constitutional Court assessments regarding "amendments after reversal."
A safe approach in practice: To use amendments "at the right time" and "completely in one go."

3.3. Increasing the amount of the claim in an uncertain claim case (Code of Civil Procedure, Article 107/2)

Article 107/2 of the Code of Civil Procedure stipulates that when the amount of the claim becomes ascertainable through investigation/expert opinion/information provided by the opposing party, the plaintiff may increase their claim without being subject to the prohibition against expanding the claim

The most common applications in commercial litigation are:

• Complex accounts such as current accounts, commissions, premiums, and discounts,

• Damages due to defective performance, production loss, inventory/supply chain damage,

• In foreign currency receivables, the effects of exchange rates/interest/compound rates need to be clarified by an expert.

The critical condition here is that it shouldn't be objectively possible to determine the exact amount at the time the lawsuit is filed . "I didn't bother" isn't enough to resolve the ambiguity; the case file must allow for that.

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4) Moves that count as and don't count as "expansion": Quick checklist for business files

The following distinction is a crucial one in Commercial Court practice, changing the course of a case.

4.1. Those generally considered "expansion/modification"

• a new claim item : initially only "invoice amount" but later claiming "penalty clause + loss of profit".

• a new fact : After the statement "delivery was made," adding a new set of facts such as "actually it wasn't delivered."

• Introducing new defenses : adding essential defenses such as statute of limitations, set-off/offset, performance/release at a later stage.

• a new counterclaim (a counterclaim is subject to its own time limit; often strictly bound by the response time limit)

4.2. Moves that are not generally considered "expansions" (but require attention)

• Explanation/proof of the present case : additional details supporting the same case.

• the legal classification : requesting the application of a different legal rule to the same set of events.

• Correction of account (material error) without expanding the scope of the claim – still the safest approach in most cases: explicitly using the logic of "correction of material error" and, if possible, with the other party's knowledge.

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5) Practical examples in commercial litigation: The 8 most common scenarios

The following examples provide concrete answers to the question, "Which move constitutes an extension?".

Example 1: Adding "commercial interest" and "default date" later in an invoice receivable lawsuit

• Introduction: The plaintiff only requested "reimbursement of the invoice amount".

• Later, they demanded: "Advance interest/commercial interest + a specific default date + notice fee".

Risk: If the initial petition did not mention "with interest" or did not discuss the type/start date of interest at all, this part of the claim may be considered an expansion and could be blocked by Article 141 of the Code of Civil Procedure.

Practical solution (when filing a lawsuit):
Clearly define the claim amount as “principal amount owed + (type of interest and start date) + collection fees/expenses”.

Example 2: Converting a claim for unpaid wages into a claim for damages in a service contract

• Starting point: "unpaid consulting fee"

• Later, "compensation for loss of profit due to breach of contract" was also added.

This is a typical example of an extension. This applies only if the petition stage has been passed

• Explicit consent or

• reform .

Example 3: Adding a "penalty clause" later in a distributorship/franchise relationship

In commercial contracts, penalty clauses are often a separate item. If it is forgotten in the lawsuit petition and an attempt is made to add it during the investigation phase, it will run into the wall of Article 141 of the Code of Civil Procedure.

Strategy: Is the penalty clause an alternative demand or the primary demand? It needs to be designed from the outset.

Example 4: The defendant's late presentation of the "set-off/counter-off" defense

The offsetting/set-off defense is the "case-turning" defense in most commercial cases. However, if this defense is raised too late:

• The other party may raise an objection based on the "prohibition of expansion"

• The court may choose not to hear the defense.

Practical solution: The response should include all core arguments such as "set-off/offset, payment, performance, notification of defect, statute of limitations" as a "core" point.

Example 5: Raising a jurisdiction/arbitration objection at a later date

In commercial litigation, if there are jurisdictional or arbitration clauses, these are often preliminary objections and are expected to be raised in the answer to the complaint. Raising them late risks forfeiting the right to object.

Conclusion: Arguments that "can conclude a case with a technical objection" cannot be left to a subsequent supplementary petition.

Example 6: Claiming compensation later in an unfair competition lawsuit

• Starting point: Simply “detection + ban + removal of broadcast”

• Later, a claim for "material and moral damages" is added.

This is often an overt extension. The safest option is:

• Initially, it is important to also plan the compensation (at least "rights to claim further damages reserved" + appropriate type of lawsuit),

• Alternatively, if there are uncertain terms regarding the receivables, one could consider the HMK 107/2 model.

Example 7: Increased claim after expert assessment in current account/reconciliation file

In current accounts or complex business ledgers, once the figure is clarified by an expert report, the plaintiff may wish to increase the amount.
If the lawsuit an uncertain receivable , Article 107/2 of the Code of Civil Procedure allows the plaintiff to "increase the amount without being subject to the prohibition of expansion."

Example 8: Defendant adding the fact of "defect reported / defect acknowledged" late

The defendant attempts to add commercial defenses late, such as "notification of defect was not made within the prescribed time." These defenses include:

• If he brings a new set of cases,

• If it unexpectedly alters the course of the proceedings,
  it poses a risk under Article 141 of the Code of Civil Procedure.

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6) Seven golden rules for "setting the case right from the start" in commercial litigation

1. Write down the details of the claim item by item. (Principal amount owed, type of interest, initial amount, penalty clause, compensation items…)

2. Describe the case in detail, but don't digress. Establish a sequence of events that connects each claim.

3. Plan alternative demands from the outset. (Primary-secondary-alternative)

4. If you are the defendant, summarize your initial objections and main defenses in your response brief

5. Include the evidence in the initial petitions using a core list of evidence , rather than adopting a "I'll bring it later" approach

6. If you think "an increase in claims may be necessary," an uncertain claim/partial lawsuit strategy from the outset.

7. If you have the option to amend the file, use it only once and "at the moment the file is broken" (remember the rule that amendments can only be made once).

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7) The most common mistake: Trying to add a new request using the "additional petition" option

In commercial litigation, especially during the investigation phase, petitions beginning with the following sentence are very common:
"We are updating our request due to new documents we have received..."

If the following is done:

• new case,

• new demand item,

• a new reason for defense
  often falls under the prohibition of Article 141 of the Code of Civil Procedure. The solution is explicit consent or amendment .

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Success in commercial litigation is "talking at the right time."

The prohibition against expanding claims and defenses is not merely a theoretical procedural rule in commercial litigation; it is a "timing discipline" that determines the essence of the case , from the amount of the claim to the type of interest, from penalty clauses to set-off defenses . Correctly interpreting the boundaries set by Article 141 of the Code of Civil Procedure; establishing the right strategy for obtaining consent at the right time , amending the claim at the right time , and handling uncertain claims in the right case ; is the most tangible area of ​​success in commercial litigation.