Client: rigidity is a virtue! It really is

A firm delivery date in your contract is no guarantee that it will be enforced. If, in practice, you adopt a flexible stance as the client—by allowing delays to pass without protest, taking coordination into your own hands, or letting the schedule become diluted—then the other party is entitled to expect flexibility as well. Under the Haviltexstandard, a judge or arbitrator can then set aside your contractual penalty clause. If you wish to maintain a firm delivery date, you must strictly monitor it, consistently insist on the deadline, and send a written reminder on time.

In short

• A date on paper is not automatically a hard deadline. The way parties behave influences how the contract is interpreted.
• A fatal deadline causes the counterparty to be in default by operation of law; a non-fatal deadline first requires a written notice of default.
• Facilitation costs rights. Silently accepting delays can undermine your penalty clause and weaken you in legal proceedings.
• Hard remains hard if you explicitly set the date as fatal, actively monitor the schedule, and immediately protest and issue a written warning in the event of impending delays.

Why a hard delivery date can become soft after all

Many entrepreneurs assume that a delivery date in the contract is binding: if a date and a penalty per day of delay are stated, that is it. In practice, Dutch contract law works differently. A contract is not only read as it is literally stated, but also interpreted based on what the parties could reasonably expect from each other – including how they behaved during the execution.

The consequence is counterintuitive: a flexible, accommodating attitude can actually cost you your own rights. Anyone who constantly makes concessions will find it difficult to invoke the hard letter of the contract later on.

What exactly is a fatal deadline?

A fatal deadline is an agreed date by which a performance must be completed at the latest, intended so that exceeding it has immediate consequences. The legal significance lies in the default: with a true fatal deadline, the counterparty is in principle automatically in default as soon as the date expires, without the need to first send a notice of default. Only upon default does the right to the penalty, compensation, or dissolution arise.

The pitfall: whether a deadline is truly fatal depends not only on the date itself, but on the intent and the circumstances. Wording such as “negotiable,” “target date,” or “target period” undermines the fatal nature—and your own flexible behavior during execution does the same. If a deadline is not (or no longer) fatal, the counterparty is only in default *after* a proper notice of default with a reasonable extension period.

Fatal deadline versus notice of default

The distinction determines whether you can act immediately or must send a letter first:

• Fatal deadline: default generally occurs automatically as soon as the date has passed. No notice of default is required.
• Non-fatal time limit: you must first put the other party in default in writing and grant them a reasonable period. Only when that period expires is there a default.

Since the fatal nature of a notice is often precisely what is contested, it is wise to send a written reminder as a precaution, even with a seemingly hard deadline. That puts you in a strong position, regardless of how the deadline is interpreted later.

A striking example from arbitration practice

A case before the Arbitration Board clearly illustrates how this plays out . It concerned a construction contract for a home. According to the specifications, the completion period was six calendar months, meaning the work should have been finished by mid-July. In reality, completion was delayed by half a year, until January of the following year.

The specifications stipulated a discount of €250 per day of delay. Based on this, the client submitted a claim for €27,250. A substantial amount – and on paper, the matter seemed clear.

The contractor, however, disputed this. He pointed to the Memorandum of Information, which mentioned a “negotiable completion date” depending on “holidays and the start of construction”. According to him, the schedule was therefore intended to be flexible. Moreover, construction had been at a standstill for a long time without the client ever expressing dissatisfaction, the client handled much of the work in-house, and he continually took over the coordination.

What did the arbitrator rule?

The arbitrator ruled that there was no fixed completion date, but rather a flexible schedule. Therefore, a contractual penalty could not be imposed: the contractor did not have to pay the €27,250.

In fact, it turned out doubly wrong for the client. The contractor claimed compensation for additional work performed. The arbitrator did not consider the fact that this had not been reported in advance to be a problem: the client carried out so much work in-house that he must have been aware of the necessity. The client therefore had to pay for the additional work after all. A costly procedure with an unexpected outcome.

The Haviltex standard: more than the literal text

The core of these types of cases is the so-called Haviltexinterpretation. This entails that the meaning of a contractual provision is not determined solely by the linguistic text, but also by the meaning that the parties could reasonably attribute to that provision in the given circumstances – and by what they could reasonably expect from each other in that regard.

The practical context therefore helps determine what applies. If you, as the client, consistently adopt a flexible stance, the counterparty may also expect that flexibility regarding the delivery date. Your behavior during the execution colors the interpretation of the contract retrospectively.

A contract is what the parties make of it in practice – not just what is literally stated.

The risks for you as a client

As a client, you run concrete risks with a flexible attitude:

• Your penalty clause lapses. If the completion date is interpreted as “flexible”, you can no longer collect the agreed delay penalty.
• You are unexpectedly paying for additional work. Anyone who handles a lot of coordination and oversight themselves can be expected to be aware of extra work – even without prior notification.
• You are in a weaker position in legal proceedings. Remaining silent regarding delays can work against you as evidence that you did not view the deadline as strict.
• Unnecessary litigation costs. Filing a lawsuit based on a clause that does not hold up is expensive and frustrating.

This is how you actually stick to a completion date

If you want a delivery date to remain truly enforceable, you must demonstrate this both on paper and in your behavior. Practical steps:

1. Explicitly establish the hardship. Designate the date as a strict deadline and attach a clear penalty clause to it. Avoid ambiguous wording such as “negotiable” or “target date”.
2. Actively monitor the schedule. Track and document progress and interim milestones.
3. Protest in a timely manner and in writing. If delays are imminent, respond immediately. Silence will be used against you later.
4. Issue a formal demand if things go wrong. Send a written formal demand in which you set a reasonable deadline and state the consequences – even if the deadline already seems fatal on paper.
5. Be consistent. A hard date and flexible practice are incompatible. If you opt for tight deadlines, act accordingly.

What MKB Juristen can do for you

At MKB Juristen, we draft agreements that take delivery dates into account and make compliance as enforceable as possible. But as this case shows, a watertight contract is not enough: your conduct during execution also counts. We therefore think along with you about how to monitor the deadline, and if desired, we will simply draft the necessary formal notice for you.

In practice, law is often more concrete and human than one might think. We act accordingly: practical, personal, and focused on workable agreements.

Frequently Asked Questions

Is a completion date in a contract always binding?

No. A completion date is a strong starting point, but not an automatic guarantee. Under the Haviltexinterpretation, a judge or arbitrator also considers the circumstances and the conduct of the parties. A flexible approach can soften a “hard” date in practice.

What is the difference between a fatal deadline and a notice of default?

In the case of a fatal deadline, the counterparty is in principle automatically in default as soon as the date expires, without the need to send a formal notice of default first. If the deadline is not fatal, you must first put the counterparty in default in writing and grant them a reasonable additional period. Since the fatal nature of the deadline is often disputed, a formal notice of default is always advisable as a precaution.

What is the Haviltex standard?

The Haviltexstandard is the Dutch standard for the interpretation of agreements. Not only the literal text counts, but also the meaning that the parties could reasonably attribute to it in the given circumstances and what they could reasonably expect from each other.

Does my penalty clause lapse if I accept the delay without protest?

That risk exists. If you repeatedly allow delays to pass without objection, this can be interpreted as consent to a more flexible schedule, making it difficult for you to rely on the fine later. Therefore, protest in a timely manner and in writing.

What should I do if the contractor threatens to miss the deadline?

Respond immediately and in writing. Point out the agreed deadline, set a reasonable additional deadline if necessary, and send a formal notice of demand stating the consequences of non-compliance. This way, you preserve your rights.

Does this only apply to construction?

No. Although the example comes from the construction industry, the Haviltexinterpretation applies to agreements in general. Even with a standard contract for services or a supply contract, a flexible practice can undermine your firm agreements.

Need a watertight agreement?

Do you want your delivery dates and penalty clauses to actually hold up? Our legal experts help you draft and review your contracts. See what we do in the field of contract law, or dive straight into a specific construction contract or contract for services.

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