Yes, accepting a business quotation by e-mail or WhatsApp can create a binding agreement. Many business contracts do not require a signature on paper. It must, however, be sufficiently clear which offer was accepted, by whom and on what terms. The content of the entire conversation and the authority of the sender are important in this respect.
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A short ‘agreed’ can therefore have far-reaching consequences, but it does not always prove consent to everything you invoice at a later stage. In case of doubt, it must be established which version of the quotation the reply related to and whether any reservations still applied. Keep the quotation, attachments and full correspondence together before you start performing the work.
A contract is formed by offer and acceptance
The statutory starting point is set out in Article 6:217 of the Dutch Civil Code (BW): a contract is formed by offer and acceptance. For many assignments, those statements can be made orally, in writing or digitally. The law does, however, recognise specific contracts and clauses to which additional formal requirements apply.
A business quotation can be an offer if it makes sufficiently clear which performance is offered on which terms. A rough cost estimate or an invitation to discuss matters further is not always the same thing. The wording and context determine whether the other party can already conclude a contract by simply saying ‘agreed’.
An e-mail saying ‘that sounds interesting’ is different from ‘I accept quotation 2026-045 of 3 September for the stated amount’. Even ‘please reserve a slot for us’ can be unclear if price and work are still being negotiated. Make sure, therefore, that the acceptance refers to an identifiable, complete quotation.
When is acceptance by WhatsApp sufficiently clear?
A chat message carries more weight if the reply follows a specific quotation and contains no reservation. Send the quotation as a file or as a clear link to a fixed version. State in the accompanying message which assignment it concerns and explicitly ask for consent to that quotation. A scattered conversation with loose amounts and images makes reconstruction more difficult.
The identity of the sender must also be sufficiently established. A saved contact name does not in itself prove who is using the number. Earlier correspondence, business contact details and the subsequent conduct of the parties can help. For larger assignments, formal confirmation via a business e-mail address or a signing process is advisable.
A tick, emoji or thumbs-up may have a meaning in a particular context, but it is not a universal legal acceptance. A reaction may also merely confirm receipt or appreciation. If in doubt, ask for a short clarification. That takes little time and can prevent you from investing on the basis of an interpretation the client does not share.
Is a signature unnecessary, then?
A signature can provide important evidence and makes clear that someone has accepted a particular text. It is simply not a general validity requirement for every business contract. A contract may already exist before the formal document is signed, for example where the parties previously gave their final agreement and began performance.
Conversely, the parties may agree that they will only be bound after signature or approval by an authorised officer. Such a reservation must be clearly worded and monitored in the communication. Anyone who, despite the reservation, acts as if everything is final may raise new questions of interpretation.
Statutory formal requirements apply to specific legal acts. Think of certain transfers or particular consumer contracts. A digital acceptance is then not automatically sufficient in the form in which you recorded it. First check, therefore, what type of arrangement is being made. Ondernemersplein, the Dutch government’s business information portal, describes the basics of concluding contracts.
Agreement with a change is not always acceptance
A reply such as ‘agreed, but for a thousand euros less’ deviates from the offer. Under Article 6:225 of the Dutch Civil Code, an acceptance that deviates from the offer is in principle treated as a new offer and a rejection of the original offer. The law makes an exception for deviations on minor points. The significance of the change must therefore be assessed.
Price, scope, delivery and liability are often essential elements. If the client writes something different about these, first confirm the final arrangements. Starting without a response can create a dispute about which version applies. An adjustment discussed orally should also be reflected in the final confirmation.
When changes are made, use a new version date or a clear supplementary confirmation. State which parts are replaced and which continue to apply. A chain of three quotations, two telephone calls and a final ‘fine’ is vulnerable if nobody knows afterwards which amount and which work were final.
Watch out for the client’s terms and conditions
When accepting, a client may refer to its own purchasing terms and conditions. That can affect payment, warranties, liability and dispute resolution. The statutory rule on conflicting general terms and conditions is set out in Article 6:225(3) of the Dutch Civil Code. Among other things, it is relevant whether the terms referred to first were expressly rejected.
Do not assume that your terms always prevail because they were attached to the first quotation. It must first be clear which messages constitute offer and acceptance and what exactly was rejected. An express rejection may mean that fresh agreement is required. Resolve the conflict before you start.
If you reach a compromise, record the order of precedence. For example: the description of the assignment and separately agreed deviations take precedence over the general terms and conditions. Keep all attachments that formed part of the acceptance. Later replacing a file on your website does not automatically change what the parties agreed earlier.
Do you have to send your general terms and conditions?
Whether terms and conditions apply and whether the other party had the opportunity to read their content are separate questions. Make sure the client receives the correct version before or at the time the contract is concluded, or can consult and store it through an appropriate statutory route. A clear PDF attachment to the quotation is often practical.
In a chat, you can send the same PDF and refer to it explicitly. Check that the client can open the file. Merely saying that the terms are ‘somewhere on the website’ offers less certainty. Specific rules apply to electronic provision and to certain service providers; the correct route depends on the situation.
If your client accepts only the price and expressly rejects the terms and conditions, that is not a detail you can safely ignore. Discuss the deviation. A statement that the client has received all the terms is of little help, moreover, if the attachment was in fact missing. Your records must support the procedure you followed.
Was the person who gave the acceptance authorised?
An employee, project manager or account manager may communicate on behalf of a business without being allowed to conclude contracts without limit. For important assignments, check who is authorised and whether several signatures are required. An extract from the trade register and clear confirmation from the business can help here.
In certain circumstances, a business can also become bound because the other party was justified in relying on authority. The rules on representation and apparent authority are set out, among others, in Article 3:61 of the Dutch Civil Code. That assessment depends on facts attributable to the principal; the sender’s own claim alone is not always sufficient.
If in doubt, ask for ratification or approval by the authorised person before you incur costs. If you have already delivered, payments, instructions and use of the result may be relevant to the file. Do not, however, automatically conclude that every benefit to the business solves all authority problems.
What if someone made a mistake?
A statement is assessed in conjunction with the actual intention and the justified reliance it created. The basis for this is found in Articles 3:33 and 3:35 of the Dutch Civil Code. An obvious typing error may have a different outcome from a price that later turns out to be unfavourable. The fact that a business owner regrets the deal does not automatically invalidate an acceptance.
Where a price is strikingly low, the other party may, depending on the circumstances, be expected to ask questions. With a quotation that looks normal, that is different. Look at the product, the market, earlier negotiations and communication. A general disclaimer that all errors are excepted does not resolve every specific situation.
If you discover an error, respond immediately and factually. Identify which passage is incorrect and propose a corrected version. Do not silently start working at a different price or scope. The longer parties build on an unclear arrangement, the harder it may become to reverse the consequences.
Does a business client have a cooling-off period?
A business client does not automatically have the fourteen-day cooling-off period that consumers enjoy. The fact that a contract was concluded online or via WhatsApp does not by itself turn a business transaction into a consumer contract. The contract may, however, offer a cancellation option, or other statutory termination rules may apply.
A self-employed professional (zzp’er) may be a consumer when making a private purchase. The capacity in which someone acts must therefore be assessed on the basis of the specific transaction, not merely a registration with the Chamber of Commerce (KVK). In the case of contracts with mixed use, the assessment may become more complex. For business assignments, record for which business and which business activity the contract is concluded.
Nor should you confuse a cooling-off period with termination by notice or rescission. A contract for services may be subject to a statutory termination scheme, whereas rescission is linked to a failure to perform. Those routes can have financial consequences. ‘I didn’t sign’ is therefore not the same as ‘I can walk away at no cost’.
How do you preserve digital evidence?
Keep the original e-mails with attachments and the full relevant chat history. Where possible, make an export and also save the versions of the quotation separately. Note which telephone number or e-mail address belonged to which person. Make sure times, sequence and reactions remain visible.
Screenshots can be useful, but selective images often lack context. Therefore also keep the original conversation and do not alter files to make them more persuasive. A legible copy for discussion is fine as long as the original data remain available. When a dispute is looming, a careful inventory of the evidence may be more important than sending yet another reminder.
Do not search the other party’s accounts without authorisation. Gather evidence from your own lawful access and safeguard confidentiality and personal data. If evidence is in the hands of the other party, there are legal means of obtaining information. Those require a targeted assessment rather than taking matters into your own hands.
Example of a clear acceptance procedure
Send one final quotation with a number and date. Mention the attachments, the price agreement and the desired start. Ask, for example: ‘Could you confirm that, on behalf of [business], you accept quotation [number, date], including the attachments referred to in it? After your confirmation, we will schedule the work in accordance with the agreed terms.’
Reply to an acceptance you receive with a short confirmation of the assignment stating the same version. Mention who the practical contact person is and how changes will be handled. If your business only wishes to be bound after formal signature, the process must be set up precisely for that and the reservation must be clear in advance.
A hypothetical example illustrates the difference. A designer sends a quotation for five pages and receives ‘agreed’. Later, the client asks for ten additional pages. The first acceptance may prove the original assignment, but not automatically the price of that extension. Confirm additions separately, therefore, even if the collaboration is informal.
What do you do if the client denies the acceptance?
Do not just send back a screenshot, but a short chronology with the quotation, acceptance and performance. State which elements you believe were agreed and ask what exactly the client disagrees with. A substantive reply can make clear whether the problem lies with identity, authority, scope or price.
If payment is not forthcoming, the existence of the contract and its performance must be substantiated. An invoice alone does not fully prove those elements. So also gather evidence of delivery, use, feedback and previous payments. Read more about a disputed invoice and not being paid for work delivered.
Make clear what the acceptance relates to
A good digital process links the reply to one identifiable offer. Give every quotation a number and date. When making adjustments, send a new version and state which earlier version it replaces. Do not let three documents with the same file name circulate when price, schedule or terms differ.
If a reply is unclear, ask targeted follow-up questions. ‘Fine, let’s go ahead’ may mean consent to the entire assignment, but also merely permission to draw up a more detailed schedule. Confirm what you have understood and, before costly performance, ask for clarification if essential points remain open. A summary you have sent yourself does not automatically make up for missing consent.
Also check whether the message really comes from the person concerned. A familiar e-mail address or visible telephone number does not remove every risk of fraud. In the event of an unexpected change of contracting party, a large additional order or new payment details, it is advisable to verify through a previously known contact channel. Record whom you spoke to and which arrangement was confirmed. Do not needlessly share confidential documents with a new contact person before it is clear on whose behalf that person is acting.
Agree within your own business who may accept which quotations. Internal limits help with organisation, but do not in themselves determine what a third party was legally entitled to assume about authority. Combine internal arrangements, therefore, with clear external communication. For recurring assignments, this process should be aligned with your contract for services and the proper provision of your general terms and conditions.
Frequently asked questions
Is a thumbs-up on WhatsApp a binding acceptance?
That can only be assessed in light of the context. A thumbs-up may mean consent, but also receipt or appreciation. For important arrangements, ask for explicit confirmation of the quotation and price. This prevents both parties from later attaching a different meaning to the same reaction.
Can a contract exist without a signature?
Yes, for many business contracts offer and acceptance can be sufficient. Digital or oral statements can then give rise to a contract. This may be different for specific legal acts or where a signature reservation has been agreed. The absence of a signature is therefore not general proof that no contract exists.
What if my client has only opened the quotation?
Opening or downloading a quotation does not in itself amount to acceptance. A read receipt, too, mainly proves that a message has been seen. There must be sufficient indications of consent. So ask for a clear response and do not start solely on the basis of a notification from your quotation system.
May I increase the price after acceptance?
Not without a proper basis. A variation clause, a new assignment or another statutory situation may be relevant, but the original acceptance gives no general freedom to change the price. Confirm additional work and its price consequences before you carry it out. Moreover, special rules on extra work apply to construction contracts.
Are screenshots sufficient evidence?
Screenshots can constitute evidence, but their value depends on completeness, origin and context. Keep the full conversations and original files. A screenshot showing only ‘agreed’ is weaker if it is not visible what the reply related to or who sent the message.
Can an employee bind my business?
That depends on authority, power of attorney and circumstances that may give rise to justified reliance. Make clear internally who may enter into assignments and communicate limitations where necessary. If there is doubt about an existing acceptance, the entire file must be assessed; a job title alone is not decisive.
Have your digital assignment process reviewed
Arslan Advocaten can assist with a dispute about a digital acceptance and with improving your quotation process. Bring the full correspondence, quotation versions, attachments and evidence of performance. See our corporate and commercial law services or get in touch to have your arrangements assessed.
Written by Onur Arslan, attorney at Arslan Advocaten. Registered in the specialisation register of the Netherlands Bar for employment law and personal injury. Content reviewed on 12 September 2026 against the statutory text on wetten.overheid.nl and the cited judgments on rechtspraak.nl.
