Shareholder Protection Insurance: Why Business Co-Owners Cannot Afford to Ignore It

Consider the following scenario. You co-own a business with two other shareholders. Each of you holds a one-third stake. The business is valued at £6 million, so your stake is worth £2 million. One of your co-shareholders dies unexpectedly.

Under most wills, the deceased's shares pass to their estate — typically a spouse, civil partner, or children who have no involvement in the business and who may have no desire to hold a minority stake in a closely held private company. The surviving shareholders (you and the third partner) cannot be forced to buy the shares. The deceased's family cannot be forced to sell them. Without advance planning, you may find yourself sharing ownership of your business with someone who does not want to be there — and who you did not choose as a partner.

This is not a hypothetical risk. It is the default outcome in the absence of a properly structured shareholder protection arrangement. The solution — shareholder protection insurance combined with a cross-option agreement — is relatively straightforward. The cost of implementing it is modest compared with the value at risk. Yet a significant proportion of owner-managed businesses operate without it.

What Shareholder Protection Insurance Is

Shareholder protection insurance is a life assurance and critical illness policy taken out on the lives of the shareholders in a private company. The policy pays out a lump sum on the death (or, if covered, on critical illness) of a shareholder during the policy term.

The proceeds of the policy are used by the surviving shareholders to purchase the deceased's (or critically ill shareholder's) shares, at a pre-agreed or formula-based price. The result: the business continues under the ownership of the remaining shareholders, and the deceased's family or the critically ill shareholder receives fair financial value for shares that would otherwise be illiquid and hard to sell.

The Cross-Option Agreement

The insurance is only part of the solution. The mechanism that triggers the purchase is the cross-option agreement (sometimes called a double-option agreement).

A cross-option agreement creates two options:

The "call" option: the surviving shareholders have the option to purchase the deceased's shares at a pre-agreed price within a specified period after death (or the trigger event for critical illness).

The "put" option: the deceased's estate (or the critically ill shareholder) has the option to require the surviving shareholders to purchase the shares at the pre-agreed price.

Together, these options ensure that both sides can initiate the purchase. If neither party exercises their option, no sale occurs — but in practice, the insurance proceeds create a mutual incentive to complete the transaction, as the surviving shareholders have the cash available and the estate typically wants to realise the value.

The cross-option structure is preferred over an automatic buyout agreement for one important reason: Business Relief (formerly Business Property Relief). An automatic agreement — where the shares must be sold at death — is treated as a binding contract for sale, which can potentially remove the shares from the scope of Business Relief for inheritance tax purposes in the estate. A cross-option agreement, under which neither party is bound to buy or sell unless they exercise their option, is generally accepted by HMRC as preserving Business Relief eligibility.

This is a critical distinction. Where Business Relief applies to private company shares (as it typically does for qualifying trading companies), the shares may pass through the estate free of IHT — though note that from 6 April 2026, 100% Business Relief is capped at a £2.5 million allowance per person (transferable between spouses), with 50% relief on qualifying value above that. Destroying this relief through a poorly drafted buyout agreement could cost the estate hundreds of thousands of pounds.

How the Insurance Is Structured

There are two broad structures for shareholder protection insurance:

Own life policies written in trust: each shareholder takes out a life policy on their own life, which is placed in trust for the benefit of the other shareholders. On death, the trust pays out to the surviving shareholders, who use the proceeds to purchase the deceased's shares. This structure is the most common and has a well-understood tax treatment: the proceeds paid to the surviving shareholders are not subject to income tax or CGT, and the trust proceeds are not part of the deceased's estate for IHT purposes.

Company-owned (key person or cross) policies: the company takes out policies on the lives of each shareholder, with the company as beneficiary. The company uses the proceeds to fund the share purchase. This structure can be simpler administratively but requires careful consideration of how the corporate tax treatment applies (premiums may not be deductible; proceeds may be taxable as corporate income depending on the purpose).

Most shareholder protection specialists prefer the "own life in trust" structure for IHT and corporate tax reasons.

Critical Illness Cover in Shareholder Agreements

Life cover deals with death. But a shareholder can become permanently unable to work through a critical illness (cancer, heart attack, stroke) without dying. This can be equally disruptive: the critically ill shareholder may wish to exit and realise their capital; the remaining shareholders may need their full focus on running the business rather than managing a passive, illness-affected shareholder.

Critical illness cover added to a shareholder protection arrangement provides a lump sum on diagnosis of a specified serious condition. The cross-option agreement is extended to cover the critical illness trigger, allowing an equivalent purchase mechanism to operate.

Income protection — covering a shareholder's salary while incapacitated — is a separate product that complements but does not replace shareholder protection insurance.

Valuation: Setting the Purchase Price

The share purchase price must be agreed in advance (or calculated by formula) in the cross-option agreement. Several approaches are used:

• Fixed price: agreed at outset and reviewed annually. Risk: may become materially out of date between reviews.
• Formula-based price: a multiple of earnings, revenue, or book value. More dynamic but may produce results that one party considers unfair.
• Independent valuation at trigger: on the death or critical illness event, an independent valuer determines the market value. This avoids obsolescence but creates uncertainty and delay.

Most practitioners recommend a combination: a formula-based approach for simplicity and predictability, with an agreed mechanism for periodic review and for resolving disputes.

The insurance coverage must be kept in line with the agreed valuation. Underinsurance — where the policy payout is less than the agreed purchase price — leaves the surviving shareholders needing to fund the gap from their own resources or business cash.

Premium Payment and Tax

Shareholders typically pay the premiums on their own-life policies personally, from post-tax income. Unlike key-man insurance (where the company pays premiums for its own protection), own-life shareholder protection premiums are not deductible against the company's corporation tax.

The premium is effectively personal protection expenditure. For higher and additional rate taxpayers, this means the net cost is higher than it would be if premiums were corporation-tax deductible. This should be factored into the cost-benefit analysis but should not be a reason to avoid the arrangement — the protection value is enormous relative to the premium cost.

Reviewing Existing Arrangements

Many business owners who implemented shareholder protection several years ago have not reviewed it since. Common problems with legacy arrangements:

• Policy sums assured are significantly below current business valuation
• Policy term has expired or is close to expiry while shareholders are still working
• Business structure has changed (new shareholders, changes in ownership percentages) but the policies have not been updated
• Cross-option agreement exists but is not aligned with the current will and estate planning

Annual review of shareholder protection arrangements — alongside regular business valuation review — is good practice. Any significant transaction (acquisition, new investment, change in equity) should trigger an immediate review.

Partnership Protection

Equivalent arrangements exist for partnerships and LLPs, typically called "partnership protection insurance." The mechanics are similar: life and critical illness cover, with the policy proceeds used to fund the purchase of a deceased or critically ill partner's share under a partnership agreement or separate option deed. The IHT treatment may differ from the shareholder protection structure, and specialist advice is required.

This article is for information only and does not constitute insurance, legal, or financial advice. Individual circumstances vary and professional advice should be taken before implementing any shareholder protection arrangement.

How Global Investments Can Help

Our advisory team helps business-owning clients review and implement shareholder protection arrangements as part of a comprehensive business and personal financial plan. We work alongside specialist protection advisers and corporate lawyers to ensure the insurance, the cross-option agreement, and the estate planning are all properly aligned.

If you are a business co-owner without a current, properly reviewed shareholder protection arrangement in place, please contact our team to discuss the options.