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M&A fundamentals: Earn-outs in M&A transactions

In a UK M&A market which continues to face macro-economic and geopolitical headwinds, we often see parties to transactions using earn-outs to bridge valuation gaps between buyers and sellers, particularly in acquisitions involving early-stage or fast-growth technology businesses. This article explores the advantages and disadvantages of earn-outs, their key elements and alternative structuring options.

What is an earn-out?

An earn-out is a deferred payment mechanism in an M&A transaction where a portion of the purchase price is calculated based on the future financial or operational performance of the target company. Instead of receiving the full consideration on completion, the seller becomes entitled to additional payment(s) if the target meets agreed performance targets over a specified period. An earn-out will typically be documented in the sale and purchase agreement (SPA) negotiated as part of the transaction.

Why use an earn-out?

Earn-outs are commonly used where there is uncertainty around a target’s valuation – often in high-growth sectors such as technology, life-sciences or healthcare – which may depend on the future success of a product or service which is in development or about to be launched in a new market. Earn-outs therefore allow buyers to more accurately value the target and enable parties to share the financial risks of the target’s future performance. Earn-outs may also be attractive to buyers as a means of aligning the parties’ interests to maximise value and incentivise continuing participation from a seller to whom the value of the target is intrinsically linked. This may be particularly useful where the target relies on the seller’s expertise, relationships or knowledge. Where capital is limited, earn-outs can also be a practical way for a buyer to defer part of the consideration and even fund it using the target’s future cash flows. 

What are the disadvantages of earn-outs?

While earn-outs have an important role to play in M&A transactions, they do have potential disadvantages. For example, earn-outs: 

  • are one of the most common sources of post-completion disputes in M&A (see below). As it can be difficult for an SPA to cater for every scenario, the parties may disagree about various things (e.g. calculation of the earn-out, performance against financial metrics or the application of accounting principles) or the seller may feel that the buyer has breached the earn-out protections (see below);
  • take time to negotiate, add complexity to the deal process and raise a number of legal, tax and accounting issues that the parties will need to work through and address in the SPA;
  • often tie the seller in for a period post-completion and may prevent them from pursuing new ventures or stepping away from day-to-day business operations;
  • expose the seller to financial risk (both in terms of the future performance of the target and the covenant strength of the buyer – see below);
  • may, if earn-out protections are required (see below), inhibit the buyer’s ability to make strategic decisions that could otherwise enhance the target’s long-term value; and
  • can create incentives for short-term decision-making, particularly if performance is measured over a relatively short period, as the seller may be incentivised to prioritise short-term revenue or profit maximisation over long-term growth.

Key elements

While each transaction is different, an earn-out clause or schedule will typically be comprised of the following components:

 

Calculation of the amount earn-out

The SPA should contain clear drafting determining whether the earn-out is payable and, if so, the amount of the payment due. This will typically be tied to financial benchmarks, such as the target’s revenue and/or EBITDA. Sellers will generally prefer revenue-based metrics because they are less affected by costs and there is less scope for manipulation by the buyer. However, buyers often prefer earnings or profit-based metrics, because they motivate the seller to control costs and may be a more reliable indicator of the target’s value. In transactions where the valuation depends on repeatable revenue (e.g. software), a recurring revenue metric may be used. Revenue and profit-based metrics can also be combined (e.g. revenue thresholds with an EBITDA floor). Less often, an operational benchmark may be used (e.g. customer retention, product development or user numbers). It is essential that the SPA is clear as to how achievement of financial metrics is assessed (e.g. by reference to annual or audited accounts, or bespoke earn-out accounts) and the accounting principles, policies and practices applicable to such accounts. 

Earn-out payment structure

The structure of the earn-out payment(s) will also be negotiated and will vary significantly from deal to deal. Some earn-outs are binary (or “all-or-nothing”). For example, if the target achieves x million EBITDA, the seller receives a payment; if it falls short of that amount, it receives nothing. Other earn-outs use a tiered or pro-rata approach, e.g., £1.00 for every £1.00 of revenue above a baseline. The earn-out will either be paid in a lump sum at the end of the earn-out period (see below) or in instalments. Most earn-outs will be subject to an aggregate cap, limiting the buyer’s financial exposure.

Earn-out period

An earn-out will typically be calculated over a period of between 1-3 years following completion. A seller may prefer a shorter period to get paid as soon as possible and to limit their post-completion exposure and reduce uncertainty. A buyer will usually, unless it is bound by contractual restrictions in the SPA as to how it operates the business (see below), prefer a longer period to more accurately assess the target’s financial performance.

Seller earn-out protections

Since earn-outs extend a seller’s financial interest in the target post-completion, they will often ask the buyer for contractual “earn-out protections”, which prevent the buyer from doing anything that could adversely affect the target’s performance. These will be particularly important if the seller is not going to remain involved in the business during the earn-out period. These might include: 

  • a broad undertaking not to do anything with the intention of artificially reducing or distorting the earn-out;
  • an undertaking to carry on the target’s business in the ordinary course and not to make any material changes to the business;
  • an obligation not to divert business away from the target to other parts of the buyer’s group;
  • restrictions on management fees or certain other costs (e.g. capex);
  • an obligation to maintain the target as a separate entity or business; and/or
  • an undertaking to maximise the target’s profits and/or provide a certain level of working capital (a buyer is likely to resist this).

A seller may also request decision-making rights or veto powers over key decisions (e.g. hiring or firing employees, incurring debt, paying dividends/distributions, amending the articles of association of, or winding up, the target). Most buyers will resist extensive veto rights, particularly if they extend to operational aspects of the business.

 

Sellers' involvement post-completion

Many buyers will want sellers to remain involved in the business post-completion to ensure a smooth transition of key employees and customers, help integrate the target into the buyer’s group and achieve the relevant financial metrics/deliver the agreed business plan. A buyer might seek to achieve these aims by making the earn-out contingent on the continued involvement of the seller during the earn-out period. This raises additional issues, including:

  • what happens to the earn-out if the seller leaves as a “good leaver” (e.g. death, incapacity, redundancy or constructive dismissal) as opposed to as a “bad leaver” (e.g. gross misconduct or dishonesty) – a point which is often contentious is treatment of the earn-out in the event of dismissal for material under-performance; and
  • tax treatment of the earn-out payments. Sellers will want to avoid the earn-out being classified as employment income, so careful drafting and expert advice is required.

 

Security for earn-out payments

As with other forms of deferred consideration, a seller may also seek for the buyer to provide security with respect to its obligation to pay the earn-out payments (and the nature and mechanics of the security package are often heavily negotiated).

Dispute resolution mechanics

Disputes are a common issue in earn-outs, particularly with respect to calculations of financial performance and the post-acquisition management of the target. In the event that a dispute arises, an SPA will typically provide that an independent accountant will determine the correct earn-out calculation (rather than going directly to litigation, which can be costly). The SPA should also detail the manner in which such an expert will be mutually agreed between the parties and appointed, the process for the resolution of the dispute, the circumstances in which the parties can challenge an expert determination and how the expert’s fees are borne by the parties.

Set off

The buyer will typically seek to ensure that it has the ability to set-off the amount of any claims under the SPA (e.g. for breach of warranty) against any earn-out payment which becomes payable. If the seller agrees to this, it will want to ensure that the buyer’s set-off rights only apply to: 

  • settled claims (i.e. agreed between the parties or finally determined by a court); or
  • where a claim is still outstanding at the point the earn-out is payable, a claim which an independent expert (e.g. a barrister) has opined has a reasonable chance of success. In this scenario, the parties might agree that the buyer is permitted to withhold an estimated amount from the earn-out payment, pending final settlement of the claim. 

 

Alternatives

In view of the potential draw-backs of earn-outs outlined above, parties often consider alternative structuring options, including:

  • the seller retaining a minority shareholding in the target and granting the buyer a call option over these remaining shares (with the seller having a corresponding put option). However, this is often not attractive to a buyer, as it prevents them from obtaining full ownership of the target until the option is exercised. Also, as the seller and the buyer will both hold shares in the target for a period of time, the parties will need to negotiate a shareholders’ agreement and articles of association for the target to govern their relationship during the period prior to exercise of the option;
  • the seller being issued new shares, either in the target, the buyer or another entity in the buyer’s group, enabling the seller to participate in the equity upside of the new business. These could be issued as “growth shares”, which only allow the seller to participate once the business achieves a certain valuation and therefore can be more tax efficient. However, such arrangements are also complicated and will require expert tax and legal advice and the negotiation of additional documentation governing the terms of the seller’s equity; or
  • the buyer or the target retaining the seller as an employee with profit/revenue-based bonuses. While this approach may feel cleaner from a buyer’s perspective, it is likely tax inefficient for a seller, as any bonus payments will be taxed as employment income.

Conclusion

Earn-outs are a valuable tool in UK M&A transactions, particularly where the parties cannot agree on the target’s valuation or where the seller’s continued involvement in the target is integral to its success following completion. However, earn-outs do introduce additional complexity and can increase the likelihood of a dispute. As with any deal structuring decision, expert legal, tax and financial advice is essential to ensure that the chosen approach aligns with the parties’ commercial objectives and works for the specific transaction. In addition, clear drafting should reduce the scope for potential disagreements after completion as to whether the earn-out has been achieved. 

This publication is intended for general guidance and represents our understanding of the relevant law and practice as at November 2025. Specific advice should be sought for specific cases. For more information see our terms and conditions.

If you would like any further information or to discuss a specific matter, please do not hesitate to contact Adam Kuan or Joe Gallon in TLT’s Corporate team on the contact details below.

 

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Date published
13 Nov 2025

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