Protecting Deferred Consideration in a Share Sale 

Security options for sellers — and the alternatives available to buyers who cannot or will not provide a personal guarantee 

In an ideal world, a seller of shares in a company would receive the entire purchase price in cash on the day of completion. In practice, the structure of many transactions means that some or all of the consideration is deferred — payable at a later date, contingent on the future performance of the business, or subject to post-completion adjustments. 

Deferred consideration arrangements are common across a wide range of deal structures. Earn-outs — where part of the price depends on the company hitting agreed financial targets after the acquisition — are frequently used where the parties cannot agree on a fixed valuation. Vendor loans, where the seller effectively lends part of the price back to the buyer, are common in management buy-outs and acquisitions where external finance is limited. Completion account adjustments, loan note structures and instalment payments are all variations on the same theme: the seller completes the transaction before receiving everything they are owed. 

Once the shares have been transferred to the buyer, the seller’s legal position changes fundamentally. They no longer own the business. The assets that represented their security — the very thing that was being sold — are now in the hands of the buyer. If the buyer defaults on a deferred payment, the seller’s recourse is a contractual claim against someone who may, by that stage, have extracted value from the business, become insolvent or simply disappeared. 

This article, prepared by the corporate and commercial team at Ronald Fletcher Baker LLP, examines the principal forms of security available to protect a seller in these circumstances, the advantages and disadvantages of each, and the options available to a buyer who is unwilling or unable to provide a personal guarantee as security for deferred payments. 

Part One: Security Options for the Seller 

The starting point for any seller negotiating deferred consideration is to identify what security — if any — the buyer is willing to offer. The range of options is wider than many sellers appreciate, and the appropriate structure will depend on the size and nature of the transaction, the identity of the buyer, the assets available and the relative bargaining positions of the parties. 

1.  Personal Guarantee 

A personal guarantee is the most direct and, for sellers, often the most commercially satisfying form of security. Under a personal guarantee, an individual — typically the buyer, the buyer’s principal shareholders, or the directors of the acquiring vehicle — gives a personal promise to meet the deferred payment obligation if the primary obligor (the buyer entity) fails to do so. 

The guarantee creates a secondary liability: the guarantor becomes personally responsible for the debt if the buyer defaults. Unlike security over assets, a personal guarantee does not require the seller to take any enforcement steps against the company before pursuing the guarantor, provided the guarantee is drafted as ‘on demand’ or as a primary obligation rather than a secondary one. 

Key drafting considerations 

• The guarantee should be drafted as a primary obligation (as a principal debtor and not merely as surety) to prevent the guarantor relying on technical suretyship defences. 

• It should be expressly stated to be continuing, covering all amounts outstanding and not discharged by any partial payment. 

• Any change to the underlying SPA or deferred consideration terms should require the guarantor’s consent, to avoid the guarantee being discharged by a material variation. 

• The guarantee should survive any insolvency, administration or liquidation of the buyer entity. 

✔  Advantages	✘  Disadvantages
Direct recourse against an identifiable individual, regardless of the buyer company’s financial position.	Only as valuable as the personal financial standing of the guarantor — if they are asset-light, the guarantee may be worthless in practice.
Simple to document — a personal guarantee can be a short, standalone deed.	Can be difficult to enforce against individuals, particularly where assets are held jointly or have been transferred to family members.
Does not require registration or formalities beyond execution as a deed.	Buyers, particularly institutional or private equity buyers, will almost always refuse to give personal guarantees.
Highly effective where the guarantor has substantial personal assets.	A guarantor may have multiple guarantees outstanding, diluting the value of the seller’s security.
Psychologically significant — personal exposure creates a strong incentive for the buyer to meet obligations.	Enforcement requires litigation against an individual, which can be costly, time-consuming and reputationally sensitive.

2.  Debenture — Fixed and Floating Charge 

A debenture is a document by which a company grants security over its assets in favour of a creditor. In the context of deferred consideration, the seller may require the buyer company — or the acquired target company itself — to grant a debenture securing the unpaid consideration. The debenture will typically create both a fixed charge over specific identifiable assets (such as land, plant and machinery, and intellectual property) and a floating charge over the company’s other assets and undertaking as a whole. 

Where the debenture is granted by the buyer entity, the seller has security over the buyer’s assets. Where it is granted by the target company (which the seller has just sold), the security attaches to the very business that was acquired — though this approach raises additional structural and legal complexities, including the need to consider whether the target granting security for the buyer’s obligations constitutes unlawful financial assistance under the Companies Act 2006. 

Registration requirements 

A charge granted by a company must be registered at Companies House within 21 days of creation. Failure to register renders the charge void against a liquidator, administrator or other creditors of the company. Priority between competing charges is generally determined by the order of registration. 

✔  Advantages	✘  Disadvantages
Provides real security over actual assets of the business, rather than personal credit risk.	Registration at Companies House is public — competitors and counterparties will be aware of the security.
A fixed charge gives the holder priority over the charged assets ahead of unsecured creditors and (in some cases) preferential creditors.	A floating charge can be vulnerable to the claims of preferential creditors (such as employees) and the prescribed part ring-fenced for unsecured creditors under the Insolvency Act 1986.
A floating charge, combined with a qualifying floating charge, gives the holder the right to appoint an administrator — a powerful enforcement tool.	If the buyer company has existing lenders with prior-ranking security, the seller’s debenture may rank behind them — making enforcement of limited practical value.
Registration at Companies House puts third parties on notice of the security, protecting priority.	Enforcement through administration or receivership is costly, disruptive and may destroy business value.
Can be tailored to cover specific high-value assets most relevant to the seller.	Financial assistance considerations may limit the ability to take security over the target company’s own assets.

3.  Legal Mortgage or Charge Over Land or Property 

Where the buyer or the target company owns real property — commercial premises, development land or investment property — the seller may seek a legal mortgage or charge over that property as security for the deferred consideration. This is one of the strongest forms of security available in English law, as land is a tangible, identifiable asset with an established enforcement process. 

A legal mortgage over registered land must be registered at HM Land Registry. Once registered, the seller’s charge appears on the title register and cannot be overlooked by any subsequent purchaser or mortgagee. The seller (as chargee) has the statutory power of sale on default, subject to compliance with the relevant notice requirements. 

✔  Advantages	✘  Disadvantages
Land is a durable, identifiable asset whose value can be independently assessed.	Only available where the buyer or target owns real property — many acquiring vehicles are asset-light holding companies.
Registration at HM Land Registry provides absolute priority protection against subsequent dealings.	Property values can fall, eroding the security value between the date of completion and the date of enforcement.
The statutory power of sale on default is a straightforward and effective enforcement mechanism.	Enforcement through sale requires compliance with statutory notice requirements and can take many months.
Property security is familiar to commercial lenders and can be valued and relied upon with confidence.	If existing lenders hold a first charge over the same property, the seller’s security may rank second and be of limited practical value.
Effective even where the buyer company becomes insolvent, provided the charge ranks ahead of other secured creditors.	SDLT and Land Registry fees may be payable on the creation and registration of the mortgage.
	Buyer will require release of the charge on payment, necessitating ongoing administrative steps.

4.  Escrow Arrangement or Retention 

An escrow arrangement involves placing a sum of money — either drawn from the consideration payable on completion or funded separately — into a designated account held by a third-party agent (often a law firm or a specialist escrow provider). The escrow funds are released to the seller on the occurrence of specified conditions, or to the buyer if the conditions are not met or if the seller fails to bring a valid claim within the agreed period. 

This mechanism is particularly common in two contexts: as security for warranty and indemnity claims (where a retention is held back from the completion consideration pending the expiry of the warranty claim period) and as security for specific known liabilities identified during due diligence. It can equally be used as security for earn-out payments or staged deferred consideration. 

How an escrow works in practice 

• The parties agree the amount to be held in escrow, the identity of the escrow agent and the conditions for release. 

• The escrow agent holds the funds in a separate, ring-fenced account and releases them strictly in accordance with the escrow agreement. 

• The escrow agreement specifies what happens in the event of a dispute — typically, the funds remain in escrow pending resolution. 

• Interest earned on escrow funds is usually paid to the party ultimately entitled to the principal. 

✔  Advantages	✘  Disadvantages
Funds in escrow are ring-fenced and cannot be accessed by the buyer’s creditors in an insolvency — providing true security rather than a mere contractual promise.	Requires the buyer to have — and be willing to commit — the relevant funds at completion, which may not always be possible.
No enforcement required — the seller simply instructs the escrow agent to release funds on the occurrence of the trigger event.	Escrow agent fees and legal costs of drafting the escrow agreement add transactional cost.
Neutral third-party agent removes the risk of the buyer dissipating the funds.	The buyer loses the economic benefit of the escrowed funds for the duration of the escrow period — this has a real financing cost.
Flexible — can be structured to cover any type of deferred or contingent obligation.	Disputes about the release conditions can be complex and may require litigation or arbitration to resolve.
Effective even against an insolvent buyer, as the funds are not part of the buyer’s estate.	Does not assist where the deferred consideration is contingent on future performance (earn-out) and the amount is not yet known.

5.  Secured Loan Notes 

In transactions where the deferred consideration is structured as a vendor loan — with the seller effectively lending the deferred amount back to the buyer, to be repaid over time — the obligation is often documented by way of a loan note instrument. A loan note is a form of debt security issued by the buyer acknowledging the amount owed, the rate of interest and the repayment terms. 

Loan notes can be unsecured (in which case the seller is simply an unsecured creditor) or secured (in which case the loan note is backed by a debenture, mortgage or other security interest). A secured loan note, combined with a debenture over the buyer’s assets, provides the seller with both a documented debt instrument and real asset-backed security. 

Loan notes may also be structured as convertible instruments — allowing the seller to convert the outstanding balance into equity in the buyer if certain conditions are met, which can be valuable in a growth-company context. 

✔  Advantages	✘  Disadvantages
Creates a formal, documented debt obligation with a clear repayment schedule — harder for the buyer to dispute.	An unsecured loan note leaves the seller exposed as an unsecured creditor in any insolvency of the buyer.
Can carry interest, compensating the seller for the time value of money during the deferral period.	Requires careful drafting of the loan note instrument, including events of default, acceleration provisions and intercreditor arrangements if other lenders are involved.
If secured by a debenture, the seller has real asset-backed protection in addition to the contractual right to repayment.	Senior lenders providing acquisition finance may require the seller’s loan note to be subordinated — meaning the seller is only repaid after the bank debt is cleared.
Can be structured as transferable, allowing the seller to sell the loan note to a third party if liquidity is needed.	Tax treatment of loan notes can be complex, particularly for sellers who are individuals or who have roll-over relief considerations.
Flexible — repayment terms, interest rates and security can all be tailored to the transaction.	The buyer may resist interest obligations, particularly in the early post-acquisition period.

6.  Retention of Title to Shares 

In some transactions — particularly where the buyer is making staged payments over time — the seller may negotiate to retain legal title to some or all of the shares until the deferred consideration is paid in full. This is conceptually similar to a conditional sale: the buyer receives the economic benefits of ownership (dividends, voting rights, access to the business) but legal title remains with the seller until the payment obligation is discharged. 

This arrangement requires careful drafting to define clearly what rights the buyer has in the interim period and to ensure that any security interest in the retained shares is properly documented and, where the buyer is a company, registered. It also needs to address what happens on an insolvency of either party during the retention period. 

✔  Advantages	✘  Disadvantages
Retaining legal title gives the seller a powerful lever — the buyer cannot freely deal with the shares until the obligation is met.	Managing the interim period — particularly governance of the target company — can be complex while title remains split from economic ownership.
Does not depend on the value of third-party assets — the seller retains what they already own.	A buyer who retains only beneficial (not legal) interest may have difficulties with lenders, shareholders or counterparties who require full legal ownership.
Can be combined with a share pledge (see below) for additional protection.	Insolvency of either party during the retention period raises complex questions about who owns the shares.
Particularly effective in transactions where the target company is highly profitable and the buyer is keen to obtain clean legal title quickly.	Does not protect against a reduction in the value of the shares during the deferral period.
No registration at Companies House is required simply to retain legal title.	Not appropriate for earn-out structures where the total consideration payable is not known at completion.

7.  Pledge or Charge over Shares in the Target 

A share pledge — formally, a charge over shares — involves the buyer granting security over the shares in the acquired target company back to the seller. If the buyer defaults on the deferred consideration, the seller can enforce the pledge and either take back legal title to the shares or sell them to a third party. 

A charge over shares in a private company is typically taken as an equitable mortgage or a fixed charge. To be effective against third parties and to protect priority, the charge must be registered at Companies House (if granted by a company) and the share certificates and a stock transfer form signed in blank should be deposited with the seller or their solicitors as additional security. 

✔  Advantages	✘  Disadvantages
Directly secured over the very asset that was sold — if the buyer does not pay, the seller can, in effect, take the business back.	The value of the security depends entirely on the value of the target company at the time of enforcement — if the business has deteriorated, the seller may recover less than the outstanding consideration.
Enforcement (by taking back the shares) can be swift and straightforward compared to realising other forms of security.	Enforcement can be complex, particularly if the target has third-party lenders or shareholders whose interests must be considered.
Highly effective leverage — the prospect of losing the target company is a powerful incentive for the buyer to meet its payment obligations.	Intercreditor issues may arise where the target’s own lenders hold charges over the company’s assets — the seller’s share pledge may rank behind existing security.
The security does not depend on the value of the buyer’s own assets — it is secured over the target’s value.	Buyer will resist a share pledge as it limits their freedom to deal with the target (e.g. refinancing, group restructuring).
Can be combined with an irrevocable proxy — giving the seller voting rights on the shares in specified circumstances.	If the buyer has caused the reduction in the target’s value, the seller may be enforcing security that is worth less than the outstanding debt.

Part Two: What Options Are Available to a Buyer Who Cannot or Will Not Provide a Personal Guarantee? 

A request for a personal guarantee is one of the most common — and most resisted — aspects of a deferred consideration negotiation. Institutional buyers, private equity houses, family offices and management buy-out teams all routinely refuse to provide personal guarantees. The reasons vary: lenders may prohibit personal guarantees as a condition of financing; investors may be unwilling to expose themselves personally; or the buyer may simply regard personal liability as commercially unacceptable in the context of a limited liability acquisition structure. 

The question then becomes: what can a buyer offer in lieu of a personal guarantee that will provide the seller with meaningful comfort, without placing the buyer’s personal assets at risk? The following options represent the principal alternatives available in English law transactions. 

1.  Corporate Guarantee from a Parent or Group Company 

Where the buyer is a special purpose vehicle (SPV) or a subsidiary within a larger group, the seller may agree to accept a guarantee from the buyer’s parent company or ultimate holding company in lieu of a personal guarantee from an individual. A corporate guarantee is structurally identical to a personal guarantee — it is a promise by the guarantor to meet the obligation if the primary obligor defaults — but the guarantor is a legal entity rather than an individual. 

The value of a corporate guarantee depends entirely on the financial standing of the guaranteeing entity. A guarantee from a well-capitalised, creditworthy parent is genuinely valuable security. A guarantee from a recently incorporated holding company with no assets is worth very little. 

Practical Point: Sellers should always conduct due diligence on the guaranteeing entity. 
Request the last three years’ audited accounts for the guarantor company. 
Check whether the guarantor itself is subject to any security arrangements that might limit its ability to give the guarantee. 

✔  Advantages	✘  Disadvantages
Avoids personal liability for individuals whilst still providing a guaranteeing entity with legal capacity.	A corporate guarantor can itself become insolvent — the seller may end up with two worthless claims rather than one.
Corporate assets are generally more stable and transparent than personal wealth.	The guarantor’s financial position may deteriorate between completion and enforcement.
A well-drafted corporate guarantee can be as effective as a personal guarantee in practice.	The buyer’s group may resist allowing an operating company to give guarantees for acquisition vehicle debt.
The guarantor’s financial standing can be objectively assessed from publicly available accounts.	Directors of the guaranteeing company have fiduciary duties that may limit their ability to provide guarantees without shareholder approval.

2.  Escrow or Cash Retention at Completion 

As described in Part One, an escrow arrangement is one of the most effective alternatives to a personal guarantee. The buyer funds an escrow account at completion with a sum sufficient to cover the deferred consideration (or a meaningful proportion of it), held by a neutral third-party agent. The seller’s right of recovery is against the fund itself rather than against the buyer personally. 

From a buyer’s perspective, this approach avoids personal exposure entirely. From a seller’s perspective, the escrowed funds provide certainty of recovery that is independent of the buyer’s or guarantor’s solvency. 

The principal constraint is that the buyer must have — or be able to borrow — the escrowed funds at completion. In leveraged transactions where the buyer has stretched its financing to fund the acquisition, committing additional funds to escrow may not be feasible. 

3.  Debenture over the Buyer’s Assets or the Target Company 

Where the buyer has assets — or where the target company has assets that can be charged — a debenture over those assets provides real, enforceable security without requiring personal liability from individuals. As noted in Part One, a properly registered debenture gives the seller priority over the charged assets ahead of unsecured creditors and, through a qualifying floating charge, the right to appoint an administrator. 

In a management buy-out context, the buyer (typically a newco) will have limited assets of its own at completion. However, once the target has been acquired, the newco will typically have the shares of the target as its principal asset. A charge over those shares (a share pledge), combined with a debenture over the newco’s other assets, can provide a meaningful package of security. 

Buyers should note that senior lenders providing acquisition finance will typically insist on first-ranking security over all assets of the buyer and the target. This means the seller’s debenture would rank second — limiting its practical value if the bank debt is substantial. Intercreditor negotiations between the seller, the buyer and the bank lender are often necessary in these circumstances. 

4.  Charge over Shares in the Target 

A charge over shares in the target (as described in Part One) gives the seller security over the acquired business itself without requiring personal liability from the buyer’s principals. If the deferred consideration is not paid, the seller can enforce the share pledge and either retake ownership of the target or sell the shares to a third party. 

For a buyer who is unwilling to give a personal guarantee, agreeing to a share pledge is often commercially more acceptable — the exposure is limited to losing the business they have acquired rather than their personal assets. For the seller, this can be a highly effective alternative, particularly in transactions where the target is a profitable, asset-rich business. 

5.  Bank Letter of Credit or Performance Bond 

A bank letter of credit (sometimes called a standby letter of credit) is an irrevocable undertaking by the buyer’s bank to pay a specified sum to the seller on demand, or on the occurrence of specified conditions, without the seller needing to prove default or bring proceedings against the buyer. It is, in effect, a guarantee backed by the full creditworthiness of a regulated financial institution. 

Letters of credit are commonly used in cross-border trade finance but are also available in the context of domestic M&A transactions. A performance bond is a similar instrument, typically issued by an insurance company rather than a bank, guaranteeing payment of a specified sum if the buyer fails to perform its contractual obligations. 

✔  Advantages	✘  Disadvantages
The creditworthiness of the issuing bank or insurer is beyond question — this is the highest quality security available.	The issuing bank will require the buyer to provide counter-indemnity, collateral or a reduction in other borrowing facilities — this has a real cost and financing impact for the buyer.
The seller can draw on the letter of credit immediately on the occurrence of the specified trigger — no litigation required.	Issuance fees and arrangement costs can be substantial.
Entirely independent of the buyer’s solvency — the seller is protected even if the buyer becomes insolvent.	Letters of credit are typically available for limited periods and will need to be renewed if the deferred consideration period is long.
Removes any need for the seller to pursue the buyer personally.	The trigger conditions must be very precisely drafted — an ambiguous trigger may result in the bank refusing to pay.
Can be structured as an on-demand instrument, payable without proof of underlying default.	Not commonly used in domestic UK M&A transactions — some buyers and their banks may be unfamiliar with the mechanics.

6.  Deferred Transfer of Legal Title 

Where the buyer is unable to offer other forms of security but the parties still wish to proceed, one option is to structure the transaction so that legal title to the shares passes to the buyer in tranches, as and when each instalment of deferred consideration is paid. This avoids the need for a guarantee whilst maintaining the seller’s legal ownership of any unsold shares until payment is received. 

This structure is essentially a conditional or instalment sale. It requires careful governance arrangements during the transitional period — particularly in relation to the management of the target company, dividend rights and the buyer’s ability to refinance or deal with the target’s assets before all shares have been transferred. 

As an alternative to providing a personal guarantee, this option has the advantage of requiring no additional financial commitment from the buyer. Its disadvantage is the operational complexity of managing a company with split ownership, and the vulnerability of the seller’s position if the target company loses value while ownership is transitional. 

Summary: Security Options at a Glance 

The table below summarises the principal security mechanisms available to sellers and their relative suitability as alternatives to a personal guarantee from the buyer’s perspective: 

Security Type	Strength of Protection	Suitable Alternative to Personal Guarantee?	Key Constraint
Personal Guarantee	★★★★★	N/A — requires personal liability	Individual must have personal assets
Corporate Guarantee	★★★★☆	Yes — if guarantor is creditworthy	Guarantor must be financially robust
Debenture over Assets	★★★☆☆	Yes — if assets are sufficient	Often ranks behind senior lenders
Property Mortgage	★★★★☆	Yes — if valuable property is available	Buyer/target must own real property
Escrow / Cash Retention	★★★★★	Yes — strongest non-personal option	Buyer must fund escrow at completion
Secured Loan Notes	★★★☆☆	Partial — depends on security backing	Senior debt subordination risk
Share Pledge (target shares)	★★★★☆	Yes — retains business as security	Value depends on target’s ongoing worth
Bank Letter of Credit	★★★★★	Yes — bank-backed, no personal exposure	Cost and bank facility impact on buyer
Retention of Legal Title	★★★☆☆	Yes — seller retains ownership stake	Governance complexity during transition

Conclusie 

Deferred consideration is an established and commercially useful feature of many share purchase transactions. It allows deals to proceed where there is a valuation gap between buyer and seller, where financing is constrained, or where the parties wish to align incentives through an earn-out structure. But it fundamentally changes the seller’s risk profile. Having transferred ownership of the business, the seller is left with a contractual claim against a buyer who now controls the very asset that was the subject of the sale. 

Appropriate security is not a luxury — it is an essential component of any deferred consideration arrangement. The right choice of security mechanism will depend on the specific circumstances of the transaction: the identity and financial standing of the buyer, the assets available, the structure of the deal, and the relative negotiating positions of the parties. In many transactions, the optimal solution is a combination of mechanisms — for example, an escrow for the first tranche of deferred consideration, combined with a share pledge and a corporate guarantee for subsequent payments. 

For buyers who cannot or will not provide personal guarantees, the market offers a range of credible alternatives. An escrow or letter of credit backed by the buyer’s bank provides the seller with security of equivalent or greater practical value than a personal guarantee. A well-structured share pledge or corporate guarantee from a creditworthy group entity can achieve a similar result. The key is to identify, at the outset of negotiations, which mechanisms are commercially available and legally effective in the particular context of the transaction.