What language should a non-waiver clause use in a Dutch contract?

A non-waiver clause in a Dutch commercial contract should state: (1) that no failure or delay in exercising any right, power, or remedy constitutes a waiver of that right, power, or remedy; (2) that no single or partial exercise of any right prevents further exercise of that or any other right; and (3) that rights and remedies are cumulative and not exclusive. In contracts with a NOM clause, the non-waiver clause should also confirm that it can only be modified in writing. Including a reference to the continued ability to enforce the right after prior forbearance helps reinforce the clause's effect under Dutch law.

Non-waiver clause in Dutch law | non-waiver clausule

Q: What is a non-waiver clause in Dutch contract law?

A non-waiver clause is a contractual provision stating that a party's failure or delay in exercising a right, or its acceptance of defective performance without immediate objection, does not constitute a waiver of that right for the future. Under Dutch law, rights can in principle be lost by conduct that unambiguously suggests abandonment under Article 6:248(2) of the Dutch Civil Code (the derogerende werking of reasonableness and fairness). A non-waiver clause is intended to prevent that outcome by making clear that tolerant behaviour in the past does not commit a party to the same tolerance in the future.

Q: Is a non-waiver clause always effective under Dutch law?

A non-waiver clause is generally effective under Dutch law but is not absolute. Even a well-drafted non-waiver clause cannot override the requirements of reasonableness and fairness under Articles 6:2 and 6:248 of the Dutch Civil Code. If a party's conduct over a prolonged period has created a legitimate and reasonable expectation in the other party that a right will not be enforced, Dutch courts may hold that enforcing the right is unacceptable under the circumstances, notwithstanding the non-waiver clause. The key is whether the other party's reliance on the tolerant conduct was objectively justified.

Q: How does a non-waiver clause interact with a NOM clause?

A NOM (no oral modification) clause requires all amendments to the contract to be in writing. A non-waiver clause complements a NOM clause: the NOM clause prevents waiver by agreement (oral modification), while the non-waiver clause prevents waiver by conduct (tacit acceptance). Together, they form a robust package protecting the parties' contractual rights. For maximum protection, a well-drafted contract includes both a NOM clause and a non-waiver clause, and may go further by providing that the NOM clause itself can only be modified in writing (the so-called double NOM clause).

Q: Can a party waive a right by conduct under Dutch law?

Yes. Under Dutch law, a party can implicitly waive a contractual right through conduct that unambiguously signals its intention not to enforce that right. The legal basis is the derogerende werking of reasonableness and fairness under Article 6:248(2) of the Dutch Civil Code: continued reliance on a right may be unacceptable in light of the party's own prior behaviour. However, the standard is high, mere tolerance or repeated forbearance does not automatically constitute waiver. The other party must have been reasonably justified in relying on the tolerant conduct as a signal that the right would not be enforced.

The non-waiver clause (non-waiver clausule) under Dutch law

Remko Roosjen - contract lawyer in the Netherlands
April 30th, 2026

A non-waiver clause is one of the boilerplate provisions most frequently included in commercial contracts governed by Dutch contract law, yet its effect is often misunderstood. Under Dutch law, a party can lose a contractual right not only by expressly releasing it but also by conduct that unambiguously signals that the right will not be enforced. The non-waiver clausule is designed to prevent that outcome. Understanding how the clause works, and where its limits lie, is essential for anyone drafting or enforcing a contract in the Netherlands.

Why can waiver by conduct occur under Dutch law?

Under Dutch law, a party may implicitly waive a contractual right by behaving in a way that creates a justified and reasonable expectation in the other party that the right will not be exercised, a consequence flowing from the derogerende werking of reasonableness and fairness under Article 6:248(2) of the Dutch Civil Code.

The doctrine of derogerende werking, the overriding effect of reasonableness and fairness, allows a court to disapply a contractual provision that would be unacceptable to apply in the circumstances. Where a party has repeatedly tolerated a breach, accepted defective performance without objection, or otherwise led the other party to believe that it will not insist on strict compliance, enforcing that right at a later stage may be contrary to good faith. This is not mere theoretical risk: Dutch courts have held in various contexts that a creditor who has consistently not invoked a contractual right, such as a right to terminate, a penalty clause, or a strict delivery deadline, can lose the ability to invoke it abruptly without prior notice.

The non-waiver clause addresses this by expressly providing that past forbearance does not bind the party for the future. Without such a clause, a party must take care to periodically reassert its rights in writing to avoid the inference that it has silently accepted a deviation from the contract terms.

What is the scope and effect of a non-waiver clause under Dutch law?

A non-waiver clause in a Dutch commercial contract typically provides that no failure or delay in exercising any right or remedy constitutes a waiver; that a single or partial exercise does not preclude further exercise; and that the clause itself can only be modified in writing.

The clause reverses the default inference that tolerance equals acceptance. It signals to both parties, and to a court, that the contracting parties have consciously allocated the risk of forbearance: tolerant behaviour by one party is not to be construed as a modification of the contractual standard or as a surrender of rights. This serves a practical purpose in long-running commercial relationships where minor deviations from contract terms are common and parties would otherwise face the dilemma of either accepting every deviation formally or permanently losing their rights.

Non-waiver clauses are particularly important in contracts that include strict performance obligations, reporting requirements, insurance maintenance obligations, financial covenants in loan agreements, and exclusivity or non-compete provisions. In each of these contexts, a party that temporarily refrains from enforcement, for commercial or relationship reasons, should not be disadvantaged by that choice when the relationship deteriorates.

What are the limits of a non-waiver clause under Dutch law?

A non-waiver clause is enforceable under Dutch law but cannot override the requirements of reasonableness and fairness under Articles 6:2 and 6:248 of the Dutch Civil Code: if a party's conduct has created a sufficiently strong and objectively justified reliance that a right will not be enforced, a Dutch court may decline to give effect to the non-waiver clause.

The critical test is whether the other party's reliance on the tolerant conduct was reasonable and justified in all the circumstances. A party that has for years accepted late payment without objection, never invoked a contractual penalty, and conducted itself as if the original payment term were effectively modified may find that a Dutch court treats the non-waiver clause as insufficient to reverse that conduct. The longer the period of tolerance, the clearer and more specific the other party's reliance, and the more disproportionate the sudden enforcement, the less weight the non-waiver clause will carry.

This means that even with a non-waiver clause in place, a party intending to resume strict enforcement should give the other party reasonable advance notice, a formal letter reserving all rights and notifying that future non-compliance will result in enforcement action. This notice limits the other party's ability to claim justified reliance on continued tolerance and protects the notifying party's legal position.

How does a non-waiver clause interact with NOM and entire agreement clauses?

A non-waiver clause works best as part of a cluster of boilerplate provisions, alongside a no-oral-modification clause and an entire agreement clause, each addressing a different mechanism by which contractual rights can be eroded.

The NOM clause prevents the parties from modifying the contract orally. The non-waiver clause prevents rights from being lost by conduct. The entire agreement clause prevents pre-contractual representations from supplementing the written contract. Together, they form a comprehensive set of protections for the written agreement. In M&A transactions, all three typically appear in the same boilerplate section of a share purchase agreement or shareholders' agreement.

A subtle gap: under Dutch law, the NOM clause itself can in principle be overridden by a subsequent oral agreement. A dubbele NOM-clausule (double NOM clause) addresses this by providing that the NOM clause can only be modified in writing. Similarly, the non-waiver clause should specify that it applies equally to the clause itself: a party cannot waive the non-waiver clause by conduct any more than it can waive any other contractual right. Combining a well-drafted NOM clause with a non-waiver clause that covers itself is standard practice in Dutch commercial M&A and finance documentation.

Frequently asked questions about non-waiver clauses in Dutch law

What is a non-waiver clause in Dutch contract law?

A non-waiver clause provides that a party's failure or delay in exercising a contractual right does not constitute a waiver of that right. Under Dutch law, rights can be lost by conduct that unambiguously signals their abandonment, a result of the derogerende werking of reasonableness and fairness under Article 6:248(2) of the Dutch Civil Code. A non-waiver clause is designed to prevent this by making clear that past tolerance does not bind the party for the future.

Is a non-waiver clause always effective under Dutch law?

Not absolutely. Even a well-drafted non-waiver clause cannot override the requirements of reasonableness and fairness under Articles 6:2 and 6:248 of the Dutch Civil Code. If a party's conduct has created a legitimate and sufficiently strong expectation that a right will not be enforced, a Dutch court may decline to give full effect to the non-waiver clause. The solution is to give formal advance notice when resuming strict enforcement, which limits the other party's ability to claim justified reliance on past tolerance.

How does a non-waiver clause interact with a NOM clause?

A NOM clause prevents waiver by agreement (oral modification), while a non-waiver clause prevents waiver by conduct (tacit acceptance). Together they form a robust protection for contractual rights. For maximum effect, the contract should include both provisions and should specify that the NOM clause itself, and the non-waiver clause itself, can only be modified in writing, the so-called double protection against informal erosion of contractual standards.

Can a party waive a right by conduct under Dutch law even without intending to?

Yes. Waiver by conduct under Dutch law does not require subjective intent. The relevant question is whether the other party reasonably and justifiably understood the conduct as a signal that the right would not be enforced. A party that repeatedly accepts late payment, never complains about defective performance, or consistently acts as if a contract provision has been modified may be found to have waived its right to strict enforcement, even if it never intended to.

What steps should a party take if it wants to resume strict enforcement after a period of tolerance?

A party that has tolerated non-compliance and wishes to resume strict enforcement should send a formal written notice to the other party: expressly reserving all rights under the contract, stating that future deviations from the contractual standard will not be accepted, and giving the other party reasonable time to adjust. This notice serves two purposes: it limits the other party's ability to claim justified reliance on past tolerance, and it creates a clear documentary record that the non-waiver clause was actively relied upon rather than abandoned.

For specialist advice on non-waiver clauses and boilerplate provisions under Dutch law, contact Remko Roosjen, an English-speaking Dutch contract lawyer at MAAK Advocaten.