The Order Confirmation: What to Include So There Is No Dispute Later

Why disputes about orders often start with the confirmation

The customer is convinced that installation was included in the price. The company is convinced it is billed separately. In the quote, installation was listed as an option, the customer's order did not mention it, and the order confirmation said only: 'Thank you for your order, we will deliver as quoted.' Three months later, both sides are arguing over 2,400 euros and a customer relationship that had been good until then.

Such cases are common, and they rarely involve bad intent. Both sides understood something different, and no document made the difference visible while it was still cheap to resolve. The order confirmation would have been the right place for that.

This article answers one question: what has to go into an order confirmation so that there is no dispute about the order later? To answer, we first clarify what an order confirmation is legally, then present a thinking model from contract theory, weigh contract against trust, and finally derive a ten-point template. The article refers to German law and is not legal advice. For larger orders or your own terms and conditions, a lawyer's review is worthwhile.

A misunderstanding costs one email before delivery and a customer relationship after it.

What is an order confirmation legally?

An order confirmation is a supplier's written declaration that it accepts an order on certain terms. German law does not require it. A contract can also be concluded orally, by email, or simply by delivering. Legally, it is usually the acceptance of an offer: if the customer has ordered, the order is the offer, and the order confirmation accepts it.

What matters is what happens when the confirmation deviates from the quote or the order. Under Section 150(2) BGB, an acceptance with extensions, restrictions, or other changes counts as a rejection combined with a new offer. A different delivery date, a different price, or an additional reservation therefore turns the order confirmation into a new offer that the customer must first accept. According to the established case law of the Federal Court of Justice (BGH), the customer's silence is generally not enough for this. If the customer then accepts the delivery without objection, however, this may amount to tacit consent depending on the individual case.

This differs from the commercial letter of confirmation. It confirms a contract already concluded orally or by phone between merchants and records its content. If the recipient does not object without delay, it must, under customary law, generally accept the content as binding, unless the letter deviates so much that the sender could not expect agreement. For companies this means: incoming confirmations from suppliers should be read promptly, and deviations should be objected to immediately.

The thinking model: every contract is incomplete

With transaction cost theory, the economist Oliver Williamson showed why contracts can never settle everything (Williamson 1985). People are only partly able to foresee all future cases, and every additional rule costs time in negotiating, writing, and checking. Contracts therefore inevitably remain incomplete. Gaps are later filled by law, custom, negotiation, or, in the worst case, dispute.

For the order confirmation, a sober rule follows. The point is not to settle every conceivable case. That would produce a ten-page document nobody reads. The point is to close the gaps where disputes typically arise: what exactly is part of the work, and what is not? How binding is the date? What costs extra? Who is waiting for whom?

An everyday comparison shows the principle. Telling a tradesperson to renovate the bathroom produces an invoice that can be argued over. Recording which tiles, up to what height, whether disposal is included, and when it should be finished does not answer every question, but it answers the ones people argue about.

Contract or trust? Two perspectives

Many owners consider detailed confirmations a sign of distrust. They have known each other for years, a handshake is enough, and putting every point in writing signals that you expect a dispute. There is good evidence for this view. In a meta-analysis, Claro, Xue, Hong, and colleagues (2025) evaluated 303 studies of business relationships between suppliers and buyers from 27 countries. Relationship-based mechanisms such as trust and shared norms were more strongly associated with performance than mechanisms from transaction cost theory, which include the use of formal contracts.

The opposing position is: precisely because trust is valuable, it should not be burdened with misunderstandings. In a widely cited study, Poppo and Zenger (2002) showed that formal contracts and relational governance do not replace but complement each other. Clear contracts create the framework within which trust can grow, and trust fills the gaps every contract leaves.

I consider the second view the right one, provided the order confirmation is understood not as protection against the customer but as a shared summary. A confirmation that states in a friendly way what was agreed and openly addresses a deviation is a form of transparency. It shows the customer that you listened. How to phrase an unwelcome deviation, such as a later date, so that trust remains is described in the article on delivering bad news.

The ten-point order confirmation

The following template is the tool of this article. It addresses the points where disputes typically arise and complements the seven-point handoff from the article on how to optimize order processing. Whatever is in the confirmation is then also on the handoff sheet.

• Reference: quote number, order date, and the customer's order number.
• Scope: what exactly is delivered or performed, with quantity, specification, and location.
• Not included: what is explicitly not part of the order, such as installation, disposal, or training.
• Dates: delivery or completion date and whether it is binding or estimated.
• Customer's contribution: what the customer must provide by when, such as approvals, access, or documents.
• Price: net amount, VAT, discounts, surcharges, and what extra work costs.
• Payment: payment terms, installments, and the invoicing route, such as the address for e-invoices.
• Terms: delivery terms, reference to your own terms and conditions, and retention of title if applicable.
• Deviations: every deviation from the quote or the order, clearly marked, with a request for confirmation.
• Contact: who is responsible for the order, with phone and email.

Two points are forgotten most often. The not included point prevents most disputes about scope, because it states what both sides otherwise only assume silently. And the customer's contribution point prevents disputes about dates, because it records that a date holds only if the customer delivers on time in turn. For project orders, the success criteria belong in it as well, as the article on the handoff from sales to the project team describes.

Handling deviations, terms and conditions, and deadlines correctly

Deviations are the most delicate part. Silently inserting a different date or price into the confirmation risks, under Section 150(2) BGB, that no contract exists yet, and the customer rightly feels caught off guard. It is better to name every deviation at the top of the confirmation, give a brief reason, and ask for confirmation before work begins. For significant changes, execution should wait until consent is given.

With business customers there is often also a battle of the forms: the customer orders under its purchasing terms, the company confirms under its sales terms. According to a widely held view in case law and literature, the contract is still concluded if both sides perform it, but the conflicting clauses do not become part of the contract. They are replaced by the statutory rules (Section 306(2) BGB). Anyone who depends on a particular rule, such as a liability cap, should therefore not just hide it in their own terms and conditions but agree on it explicitly in the individual case.

1. On the day of the order

   Compare the order with the quote. If scope, price, and date match, the confirmation goes out the same day.

2. In case of deviations

   Name the deviation at the top, give a brief reason, ask for confirmation. Work on significant points begins only after consent.

3. For incoming confirmations from suppliers

   Compare immediately with your own order and object to deviations in writing without delay.

4. After the confirmation

   Transfer the content to the handoff sheet and enter the dates in the plan.

So that the confirmation is produced quickly and consistently, it should come from the same template and building blocks as the quote, as described in the article on how to standardize your quoting process. Anyone introducing e-invoicing anyway should ask for the customer's invoicing address in the confirmation, as the article on the e-invoicing mandate recommends.

Conclusion: what has to go into an order confirmation?

The opening question was
belongs in an order confirmation so that there is no dispute later. Transaction cost theory sets the direction: no document settles everything, so it must settle the points where disputes typically arise. These are above all the exact scope including what is not included, how binding the dates are together with the customer's contribution, additional costs, and payment terms. Legally, what matters most is to mark deviations from the quote openly and have them confirmed, because under Section 150(2) BGB they constitute a new offer. Research on business relationships shows that trust carries more weight than contract texts, and that the two complement each other. A clear order confirmation is therefore not a sign of distrust but a summary that protects trust.

The next step

1. Take the last three disputes or complaints and check which of the ten points was missing from the confirmation.
2. Add the points 'not included' and 'customer's contribution' to your own template.
3. Establish that deviations from the quote always appear at the top of the confirmation and must be confirmed.
4. Check the template's footer for the information required on business letters.
5. Agree on who compares incoming supplier confirmations with the order on the same day.

The changes take an hour. They pay off with the first order in which a misunderstanding surfaces before the start instead of after delivery.