Disclosure Letters: How Sellers Limit Their Liability

A disclosure letter is the document a seller of a company or a business gives the buyer at exchange, alongside the share purchase agreement or asset purchase agreement, setting out the facts that qualify the warranties the seller has given. It has nothing to do with employment references, DBS certificates or court disclosure: in a business sale it is the seller’s single most important protection against a warranty claim after completion.

The principle is simple. A warranty is a contractual statement about the target, for example that it is not involved in any litigation, that it holds all necessary licences, or that its management accounts have been properly prepared. If a warranty is untrue at exchange, the buyer has a claim for breach of contract. A matter that has been properly disclosed is carved out of the relevant warranty, so the buyer cannot claim on it. Everything turns on the word “properly”, and the standard that word has to meet is set by the agreement itself, not by any general rule of fairness.

We act for both sellers and buyers on company and business sales, and disclosure is where more deals get stuck in the final fortnight than on any other single document. This guide explains what the letter does, how general and specific disclosure differ, what the courts have actually held about “fair disclosure”, why putting documents in a data room does not disclose them unless the agreement says it does, and how sellers should prepare.

What a disclosure letter actually does

The disclosure letter is written by the seller’s solicitors and addressed to the buyer. It is not a schedule to the agreement, although it is referred to in the agreement and is normally dated and exchanged at the same moment. It does two things.

• It qualifies the warranties. The operative clause in the agreement will say that the seller is not liable for a claim to the extent that the matter giving rise to it was disclosed in the disclosure letter. Each disclosure that meets the contractual standard removes that matter from the warranty it relates to.
• It transfers risk on known problems. Once something is disclosed, the buyer takes it on with eyes open. If the buyer is not willing to take that risk, it has to react before exchange: by reducing the price, by asking for a specific indemnity, by requiring the problem to be fixed as a condition, or by walking away.

That second point is why disclosure is a commercial negotiation and not an administrative exercise. A late disclosure of something significant will often reopen price. Sellers who leave disclosure until the week of exchange hand the buyer a reason to renegotiate at the worst possible moment.

It is also worth being clear about what a disclosure letter does not do. Disclosure qualifies warranties. It does not usually qualify indemnities, which are drafted precisely because the parties already know about a risk and have agreed that the seller carries it. It does not cut down the fundamental warranties on title and capacity. And it does not reduce the agreed liability caps, time limits or de minimis thresholds, which sit separately in the limitations schedule. We cover how those pieces fit together in our guide to warranties and indemnities in a business sale.

General disclosure and specific disclosure

Almost every disclosure letter is in two parts, and they do different jobs.

General disclosures

These are sweep-up disclosures of whole categories of information, deemed disclosed against all of the warranties. They typically cover matters appearing on the Companies House register for the target, entries at the Land Registry against the target’s properties, the target’s own statutory books, matters appearing in registers kept by any regulator the business is subject to, and in many deals the contents of the data room.

General disclosure is heavily negotiated. Buyers push to narrow it, usually by requiring that only matters a reasonable buyer would actually find on a proper search are disclosed, by dating the searches, and by removing the data room from general disclosure altogether. Sellers push the other way. The outcome is a commercial question about who carries the risk of something neither side has spotted.

Specific disclosures

These are the real work. Specific disclosures are drafted warranty by warranty, against the numbering of the warranty schedule, and set out the actual facts. If the warranty says the target is not party to any litigation, the specific disclosure sets out the claim, who brought it, what it is about, the sums involved, what stage it has reached and what the target’s advisers think of it. If the warranty says all employees are on the standard contract, the specific disclosure names the three who are not and says how their terms differ.

What “fair disclosure” means, and why the agreement defines it

This is the part most commentary skates over. There is no free-standing legal rule that disclosure in a business sale must be fair. The standard a disclosure has to meet is whatever standard the agreement sets, and English courts apply it as a matter of ordinary contractual interpretation.

The usual formulation is that the seller is not liable to the extent that a matter is “fairly disclosed with sufficient detail to identify the nature and scope of the matter disclosed”. Every word in that phrase does work. Where it appears, the courts have taken a strict view of what satisfies it. In Levison v Farin [1978] 2 All ER 1149, Gibson J held that protection by disclosure “will not normally be achieved by merely making known the means of knowledge which may or do enable the other party to work out certain facts and conclusions”. In Daniel Reeds Ltd v EM ESS Chemists Ltd [1995] CLC 1405, the Court of Appeal held that leaving a lapsed licence off a list was not fair disclosure of its expiry, Beldam LJ saying that “fair disclosure requires some positive statement of the true position and not just a fortuitous omission from which the buyer may be expected to infer matters of significance”. In New Hearts Ltd v Cosmopolitan Investments Ltd [1997] 2 BCLC 249, Lord Penrose held that a “repetitive and omnibus” invitation to the buyer to make what it would of a pile of documents could not “by any stretch of the imagination be considered fair disclosure”, and that mere reference to a complex source document “within which the diligent enquirer might find relevant information” would not do.

The flip side is just as important, and it is the point sellers and buyers most often get wrong. Where the agreement does not impose a fairness standard, the court will not supply one. In Infiniteland Ltd v Artisan Contracting Ltd [2005] EWCA Civ 758, the warranties were given “save as set out in the Disclosure Letter”, with no requirement of fair disclosure attached. The disclosure letter deemed disclosed everything previously supplied to the buyer’s reporting accountants. The Court of Appeal held that was enough. Chadwick LJ observed at [70] that it would have been open to the buyer “to refuse to accept disclosure made in general terms by reference to what had been supplied to its reporting accountants”, but that it had not taken that course, and so the disclosure requirement was satisfied in relation to matters that could fairly be expected to come to the reporting accountants’ knowledge from an ordinary due diligence examination of the documents supplied.

In Triumph Controls UK Ltd v Primus International Holding Co [2019] EWHC 565 (TCC), O’Farrell J pulled the authorities together. At [335] she set out the principles: the commercial purpose of a disclosure clause is to exonerate the seller by fairly disclosing the matters giving rise to the breach; the contractual requirements are construed in the usual way; adequacy is assessed by careful analysis of the disclosure letter against those requirements; a letter that purports to disclose specific matters merely by pointing at other documents as a source of information will generally not be adequate, and disclosure by omission will rarely be adequate; but it is open to the parties to agree the form and extent of disclosure that will count, including disclosure by list or through a data room; and where disclosure is made by reference to other documents, only matters that can be ascertained directly from those documents are disclosed.

The practical consequence is that the first thing to read in any argument about disclosure is the definition clause, not the letter. A standard that requires the “nature and scope” of a matter to be identified is materially harder to satisfy than one requiring only its “nature”. In Triumph the clause required disclosure of the nature of the matter but said nothing about scope, and the judge held at [349] and [352] that the seller had validly disclosed persistent delivery and quality problems even though the full extent of them was not apparent. Negotiating that single word is worth more to either side than a page of argument about the letter itself.

The disclosure bundle and the data room

The disclosure bundle is the set of supporting documents referred to in the letter: the litigation correspondence, the leases, the customer contracts, the HMRC letters, the employment contracts that depart from the standard form. It is indexed, paginated and, in a traditional deal, initialled by both sides and handed over on a USB stick or in a secure folder at exchange so that there can be no later argument about what was in it.

The data room is a different thing. It is the repository the seller populates for due diligence, often containing thousands of documents. Putting a document in the data room does not disclose it. It is disclosed only if the agreement says data room contents are disclosed, and only to the extent the agreement’s standard allows.

Where the parties do agree to data room disclosure, the courts will give effect to it, but the mechanics have to be right. In Triumph, the disclosure letter general-disclosed the documents made available through the online data room “to the extent that such documents are specified in the Data Room index drawn up as at 25 March 2013 which has been initialled by or on behalf of us and by or on behalf of you and attached to this letter”, with a CD copy to follow within ten business days. The judge held at [348] that this was an effective and sensible mode of disclosure given the volume involved. A bare line saying “the contents of the data room are disclosed”, with no fixed index, no agreed cut-off date and no copy of the room preserved, is far weaker, and in a dispute three years later it may be impossible to prove what the room contained on the day of exchange.

Buyers should also note the limit the court drew from Man Nutzfahrzeuge AG v Freightliner Ltd [2005] EWHC 2347 (Comm), where Moore-Bick LJ held at [178] that where disclosure is made by reference to documents, “only matters that can be directly ascertained from an inspection of the relevant documents are to be treated as having been disclosed”. A problem that could only be deduced by piecing together figures across several files is not disclosed by that route.

How disclosure runs alongside due diligence

Disclosure is not a separate workstream bolted on at the end. It runs in parallel with due diligence and with the negotiation of the warranty schedule, and the three feed each other. The buyer’s due diligence questions generate the answers that become specific disclosures. The warranty schedule tells the seller’s solicitors exactly which questions to ask management. The disclosure letter then tells the buyer which of the answers it is being asked to accept as a risk it carries.

Where exchange and completion are simultaneous, which is the norm on smaller SME deals, step seven falls away. Where they are split, for example because regulatory consent or landlord consent is needed, the agreement has to say whether the seller may disclose against the completion repetition of the warranties. Buyers usually resist that, because it would let the seller disclose away a problem the buyer is contractually obliged to complete on.

Sellers who want to control this process rather than react to it should start it before the buyer arrives. We set out how in our guide to vendor due diligence and preparing your business for sale, and the wider sequence of a sale is covered in our legal guide to selling a business in the UK.

Over-disclosure and under-disclosure

Both are real risks and they pull in opposite directions.

Under-disclosure is the obvious one. A matter left out, or described so thinly that it fails the contractual standard, leaves the warranty unqualified and the seller exposed. Because the authorities are clear that disclosure by omission will rarely work, vagueness is not a safe hiding place. It is actively dangerous, because it gives the seller false comfort that something has been dealt with when it has not. A buyer bringing a claim will have six years from breach for an agreement executed under hand, or twelve years for one executed as a deed, under sections 5 and 8 of the Limitation Act 1980, although almost every SPA cuts those periods down contractually.

Over-disclosure is less discussed and costs real money. Disclosing everything that moves tells the buyer that the business has problems, invites a price chip, and in the worst cases discloses something commercially sensitive that then has to be explained to the buyer’s board. It also takes time: a 90 page disclosure letter on a business worth two million pounds is a sign that nobody has exercised judgment, and the buyer’s solicitors will take days to work through it at the seller’s cost in delay. There is a middle position, which is to disclose the facts that genuinely qualify a warranty, properly and with enough detail, and to resist the instinct to list everything that has ever happened to the company.

A specific trap sits between the two. A disclosure that is accurate but incomplete can be worse than no disclosure at all, because it may be argued to have given the buyer a misleading picture. Where the issue is serious, the better route is usually a short, complete specific disclosure with the key documents in the bundle, coupled with an agreed commercial answer such as a retention or an indemnity, rather than a long and hedged paragraph that neither side is confident about.

Preparing to disclose: what sellers should do

• Read the definition before the letter. Find how the agreement defines disclosure and whether it requires nature only, or nature and scope. That single definition governs everything that follows.
• Start at the warranty schedule, not at a precedent letter. Work down the warranties in order and record an answer against each one. Disclosures drafted from a template rather than from the actual warranties are how gaps appear.
• Put the questions to the people who know. The finance director knows about the HMRC enquiry, the operations manager knows about the customer complaint. The selling shareholder often does not. Warranty liability usually sits with the shareholder, so the review has to reach past them.
• Give each specific disclosure enough facts to stand on its own. What the matter is, who is involved, the amounts, the dates, the current status and the document reference in the bundle. If a reader who knows nothing about the business could not identify the issue from the paragraph alone, it is not detailed enough.
• Index and preserve the bundle. Agree the index, agree the date, and keep a complete copy of what was handed over. If the data room is disclosed, preserve an image of it as at exchange.
• Do not rely on what the buyer already knows. Knowledge picked up in a meeting is not disclosure. If it matters, it goes in the letter.
• Keep the file. Warranty claims surface a year or two after completion. The letter, the bundle index, the data room image and the file notes of the warranty review are the evidence that decides them.

Buyers have a mirror-image checklist: narrow general disclosure, insist on a nature and scope standard, require specific disclosures to be given against numbered warranties rather than against the warranties as a whole, refuse blanket data room disclosure or make it subject to an agreed index, and price or indemnify anything disclosed that genuinely matters. The structure of the agreement these clauses sit in is explained in our guide to what a share purchase agreement is, and the buyer-side investigation that feeds it in our guide to legal due diligence when buying a business.

Common questions

Who prepares the disclosure letter?

The seller’s solicitors draft it, working from the warranty schedule and from information the seller and the target’s management provide. The buyer’s solicitors then negotiate it. The seller carries the risk of anything missed, so the quality of the internal review matters more than the quality of the precedent.

Is the disclosure letter a public document?

No. It is a private contractual document between the parties and is not filed anywhere. It is normally expressly confidential and is only ever produced if a warranty claim is brought.

Does disclosure protect the seller against fraud?

No. Contractual limitations on warranty claims, including disclosure, are routinely drafted so that they do not apply to fraud or fraudulent misrepresentation, and the courts will not readily construe a clause as excluding liability for a party’s own fraud. Disclosure is a protection for honest sellers dealing with inconvenient facts, not a shelter from dishonesty.

Can the seller disclose against a tax covenant?

Usually not. The tax covenant and specific indemnities are drafted as a shift of a known risk onto the seller, and the agreement normally says expressly that disclosure does not qualify them. If a seller wants a particular tax matter carved out, it has to be negotiated as an exclusion in the covenant itself, not slipped into the disclosure letter.

The practical takeaway

Disclosure is effective only to the extent the agreement’s own standard allows, so the negotiation that matters most happens in the definition clause weeks before anybody drafts the letter. A seller who settles a workable standard, starts the warranty by warranty review early, discloses the right facts with real detail and preserves the bundle and the data room will usually see off a claim. A seller who leaves the letter to the last week and points at a data room will often find that nothing was disclosed at all.

We prepare and negotiate disclosure letters for sellers and review them for buyers on share and asset sales across sectors, including owner-managed trading companies and regulated businesses such as care homes and pharmacies, where sector licences and regulatory correspondence add a further layer to the disclosure exercise. You can read more about our work on selling a business, buying a business and mergers and acquisitions. For a worked sector example, see our guide to selling a dental practice and to dental practice due diligence.

If you are preparing to sell and want the disclosure exercise handled properly rather than squeezed into the final fortnight, or you are buying and want the disclosure letter you have been sent assessed before you exchange, we are happy to talk it through. Call us on +44 207 566 1188 or email info@gurvelegal.com.

This article sets out the general legal position as at 6 October 2026 and is not advice on any particular transaction.