Earn-Out Dispute UK: 5 Early Warning Signs of Buyer Manipulation

UK earn-out manipulation signs include restricted account access, unexpected overhead charges, and diverted revenue. English law rarely requires buyers to maximise pay-outs unless mandated by the Share Purchase Agreement (SPA). To protect deferred consideration, enforce information rights, document budget cuts, and identify breaches of “reasonable endeavours” or anti-avoidance clauses before deadlines expires. Find our free downloadable checklist at the end of this article to help keep track of the early warning signs of buyer manipulation.

Detecting and Preventing Earn-Out Manipulation: A Guide for UK Founders

Many UK founders agree to an earn-out expecting to share in future growth. After completion, they often find the buyer making decisions that appear to reduce the final pay out.

This guide explains:

• What earn-out manipulation can look like in practice
• The 5 key warning signs to watch for
• Your legal rights under English law
• What to do if you suspect a problem

What Is an Earn-Out (and Why Do Disputes Happen)?

An earn-out is a mechanism where the buyer defers part of the purchase price and links it to future performance. It is usually based on revenue, profit, or EBITDA over a defined period.

Earn-outs can bridge a valuation gap between buyer and seller. They also create built-in tension.

• You, as the seller, want strong performance so you receive the deferred consideration.
• The buyer controls how the business is run, how results are measured, and how accounts are prepared.

There is no automatic obligation on a buyer to maximise your earn-out. Under English law, the buyer normally does not have to run the business to achieve the highest possible earn-out payment.

Your protection instead depends heavily on your Share Purchase Agreement (SPA), including:

• How the SPA defines the earn-out metrics and accounting rules
• Any operational restrictions on how the buyer must run the business
• Your information, reporting and inspection rights
• The dispute resolution clause and any expert determination provisions

Because so much turns on drafting, earn-out disputes are among the most common post-sale conflicts in UK M&A.

5 Earn-Out Red Flags Every Founder Should Watch For

1. You’re Being Shut Out of Financial Information

Warning sign: You stop receiving clear, timely management accounts.

This may include:

• Delayed or incomplete reports
• Less detail than you received pre-sale or in earlier periods
• Refusals to provide reasonable supporting data or explanations

Why this matters:

You need financial information to verify the earn-out calculation. Without it, you cannot check whether the buyer is applying the agreed mechanism. If your SPA includes information or audit rights, the buyer’s failure to comply may amount to a breach of contract.

Practical step:

Request information in writing and refer to the specific clauses in your SPA. Keep a clear record of any refusals, delays or incomplete responses.

2. Profits Drop- But Nothing Has Really Changed

Warning sign: Profit falls unexpectedly, but the underlying business seems stable.

Common causes include:

• Higher allocations of group overheads into your company
• Changes to accounting policies or estimates
• Internal cost restructuring or new intra-group charges

Why this matters:

Even legitimate accounting changes can significantly reduce your earn-out if the SPA bases it on net profit or EBITDA. The key question is usually:

• Are the calculations consistent with the method and accounting policies set out in the SPA (and any completion accounts)?

Rather than:

• Are the calculations “fair” in a broader sense?

If the SPA requires consistency with historic accounting policies, sudden changes may be open to challenge. If it does not, you may still argue about how the buyer exercises any contractual discretion, but those arguments are more complex and fact-specific.

3. The Buyer Stops Investing in the Business

Warning sign: Growth slows and targets become unrealistic because the buyer decides to:

• Freeze hiring or delay key appointments
• Cut or reallocate marketing spend
• Cancel or postpone agreed expansion plans or product launches

Why this matters:

Your earn-out may depend on performance targets that both sides assumed were achievable when you signed the SPA. If the buyer later takes decisions that make those targets unrealistic, you will question whether that fits the deal you agreed.

From a legal perspective:

• Buyers can usually run the business as they see fit, unless the SPA restricts that freedom.
• Some SPAs include express obligations not to act with the purpose of reducing the earn-out, or to run the business broadly consistently with past practice.
• Even where the SPA is silent, there can be arguments about how the buyer must exercise contractual discretions (for example, needing to act honestly and not arbitrarily). These arguments are technical and depend heavily on context and wording.

If you see this pattern, link specific decisions to the impact on your earn-out metrics and keep good evidence of both.

4. Revenue Is Moving Elsewhere in the Group

Warning sign: Sales are still happening, but not through the company or business unit that drives your earn-out.

Examples include:

• Existing customers are encouraged to contract with another group entity instead
• The buyer restructures contracts so revenue is booked elsewhere in the group
• Products or services are bundled across divisions so it is harder to see what income relates to your business

Why this matters:

These steps can reduce the revenue or profit figures that feed directly into the earn-out calculation, even while the group as a whole benefits. The legal position depends on:

• Whether the SPA restricts the buyer from diverting business away from the target company or business
• Whether the buyer’s conduct undermines the earn-out mechanism in a way that could amount to a breach of contract or an improper exercise of discretion

These cases often involve complex factual and accounting analysis. You usually need detailed financial and contractual evidence to show how revenue moved, why, and with what effect.

5. Key Staff or Customers Start Disappearing

Warning sign: You see a pattern of changes that weaken key relationships:

• The buyer redeploys important employees to other group entities or changes their roles significantly
• The buyer alters incentives or commission structures in ways that demotivate your sales team
• Major clients begin to shift their business elsewhere in the group

Why this matters:

Your earn-out often depends on the performance of the relationships and drivers you built before the sale. If the buyer disrupts those relationships or channels them away from your business, your earn-out may fall even though the wider group continues to perform well.

Whether you can challenge this legally again depends on the SPA:

• Some agreements include express obligations relating to key staff or key customer relationships.
• Even if they do not, evidence that the buyer knew the likely impact on the earn-out and pressed ahead regardless can be important if a dispute arises.

How to Protect Your Earn-Out (Even After Completion)

1. Use Your Information Rights

If your SPA includes:

• Reporting obligations
• Audit or inspection rights
• Rights to receive management accounts or explanations of calculations

Use them early and consistently. Frame your requests by reference to the relevant clauses, and be specific about the information and documents you want.

2. Document Everything

Keep detailed records of:

• Financial discrepancies or unexplained changes in results
• Delayed, incomplete or changing reporting formats
• Operational decisions that could affect performance, such as budget cuts, restructures or staff moves

This evidence can be critical if you need to challenge an earn-out calculation or bring a formal claim later. Contemporaneous notes and emails often carry more weight than later recollections.

3. Get Legal Advice Early

A specialist solicitor can quickly:

• Review your SPA and completion documents
• Assess whether the buyer appears to act within their contractual rights or may have breached key provisions
• Explain your options, including informal engagement, expert determination, and potential litigation or arbitration routes

Early advice does not commit you to a fight. It helps you understand your position, avoid missing contractual deadlines, and choose the most commercial way forward.

What Legal Remedies Are Available?

Depending on your SPA and the facts, you may be able to:

Challenge the Earn-Out Calculation

Many SPAs require parties to refer disputes over earn-out calculations to an independent accountant acting as an expert. If that applies:

• You may challenge specific items or adjustments in line with the procedure and timetable in the SPA.
• You need to understand which issues the expert can decide, and which issues fall outside their remit and require court or arbitral determination.

Bring a Breach of Contract Claim

If the buyer has:

• Breached express restrictions in the SPA, or
• Exercised discretions in a way that arguably falls outside what the contract permits

You may be able to bring a breach of contract claim. The court will usually assess damages by asking what you would probably have received under a proper application of the earn-out mechanism, compared with what you actually received. The High Court’s decision in Porton Capital v 3M is a useful guide to how the English courts approach these issues — particularly the buyer’s obligations to support the earn-out, consent provisions in the SPA, and the calculation of damages where breach is established. See our analysis of Porton v 3M and what it means for UK earn-out disputes.

Seek Disclosure of Financial Information

In some cases, you can ask the court to order disclosure of key financial and contractual documents. This can be particularly important if the buyer has resisted providing detail and you need evidence to test the earn-out calculation or support a claim.

View your Legal Rights After Selling a Business

Important

Earn-out disputes in the UK often turn on:

• The precise drafting of the SPA
• Detailed accounting and financial evidence
• Strict contractual and statutory time limits

Missing a contractual deadline in the SPA, or delaying until a limitation period expires, can seriously damage or even extinguish your claim. Taking early advice can help you avoid that risk.

While many earn-out concerns can be resolved through the SPA’s dispute resolution mechanism or commercial negotiation, High Court litigation is usually only appropriate where:

• The earn-out at stake is substantial in the context of the deal and your wider portfolio;
• There is credible evidence that the buyer has departed from clear contractual commitments on approvals, marketing, integration or accounting treatment; and
• The SPA’s dispute resolution mechanisms still leave room for a court to decide important liability and quantum questions.

Earn-Out Manipulation Seller Checklist

Enter your email below and we’ll send the Earn-Out Manipulation Seller Checklist straight to your inbox. The PDF includes a scoring guide to help you assess your position and a fillable table for diarising the key dates in your SPA — both of which often matter more than founders realise, because some contractual challenge windows are as short as ten business days.

 

Earn-Out Dispute? Speak to a Specialist at The Jonathan Lea Network

If you believe a buyer may be reducing your earn-out, early advice can make a significant difference to your options and strategy. At The Jonathan Lea Network, we advise UK founders and shareholders on earn-out disputes, SPA interpretation and enforcement, and negotiations with buyers after completion.

We can review your SPA, the earn-out calculation and the surrounding conduct, then help you decide on the most practical and commercially sensible next step. Contact us for a confidential initial discussion.

We do not just advise in theory. Our team has acted for sellers in real transactions where the structure and deferred consideration were critical, including, the sale of a dental practice to a corporate group, where we helped the owner secure a profitable exit on carefully negotiated terms.

We provide enquiries with an indicative scope of work and fee estimate, based on the information you share. We aim to respond within one working day.

In the same email, you will be invited to arrange a 20-minute complimentary, no-obligation video consultation, should the proposed scope of work and fee estimate be of interest. This initial discussion is designed to better understand your requirements, refine the scope, and ensure our approach is fully aligned with your objectives.

Where you would prefer to receive initial advice and guidance from the outset, we may instead recommend a fixed-fee consultation (from £250 + VAT) as a more appropriate starting point. This enables us to provide considered, tailored advice at an early stage.

To make an enquiry, please email us at wewillhelp@jonathanlea.net, complete our contact form, or call us on 01444 708640.

 

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This article is intended for general information only, applies to the law at the time of publication, is not specific to the facts of your case and is not intended to be a replacement for legal advice. It is recommended that specific professional advice is sought before relying on any of the information given. © Jonathan Lea Limited. 

Photo by : Jakub Żerdzicki