Why Options, Not an Obligation, Preserve Business Relief

If you own a company with other people and you have taken advice about what should happen to the shares when one of you dies, you have probably met two rival documents. One is a buy and sell agreement, which obliges the survivors to buy and the estate to sell. The other is a cross option agreement, which gives each side the right to force a sale without binding either of them in advance. They look interchangeable. They are not. A binding contract for sale of your shares that is already in force at the date of death can cost your estate business property relief, and a cross option, drafted properly, does the same commercial job without that cost.

That single structural fact — an option rather than an obligation — decides how the whole arrangement is drafted. It is the difference between the relief applying and the relief being lost on a shareholding that may be the most valuable thing you own. It is worth understanding why, because the mistake is easy to make and expensive to discover, given that nobody discovers it until after you have died.

This page explains what business property relief does, why a binding obligation to sell can forfeit it, how reciprocal options avoid that outcome, and why the policy that funds the deal has to be drafted to match. It also sets the question against the value actually at stake under the relief as it applies to deaths on or after 6 April 2026.

The short answer: an obligation to sell can turn your shares into taxable cash

Business property relief can reduce the value of qualifying business assets for inheritance tax, and unquoted trading company shares are often the classic example of the sort of asset it is meant to help pass down. The relief is one of the main reasons a family can inherit a business without an immediate tax bill forcing its sale.

The catch is that the relief applies to the business property itself. If, at the moment of death, there is already a binding contract that turns those shares into a fixed sum of money — because both sides were obliged to complete a sale — then what passes through the estate can be treated not as shares in a trading company but as a right to receive cash. Cash is not business property, and it does not attract the relief. In one stroke, a well-meaning agreement designed to make succession tidy can strip away the very relief that made the shares affordable to inherit.

Reciprocal options avoid that by keeping the sale voluntary until someone chooses to trigger it. Until an option is exercised, there is no contract for sale, so at the date of death the estate still holds shares, and the shares can still qualify for the relief.

What business property relief is, and what it is worth

It is worth being concrete about the stakes, because the drafting choice only matters if there is relief worth losing.

Under reforms announced by the government, the relief is changing for deaths on or after 6 April 2026. From that date a per-person allowance applies to qualifying agricultural and business property, with full relief up to the allowance and relief at a reduced rate on value above it. For a shareholding worth more than the allowance, that is the point at which the difference between keeping and losing the relief becomes real money, and it is exactly the kind of holding these agreements are written for.

Source: HM Revenue and Customs, policy paper on reforms to agricultural property relief and business property relief for deaths on or after 6 April 2026, published on gov.uk under the Open Government Licence v3.0.

Because the rules are changing and the figures depend on the final legislation, the sensible course is to have the numbers checked for your own situation rather than to rely on a rule of thumb. The structural point, though, does not depend on the exact figures: an obligation to sell risks the relief, and an option does not.

Why a binding contract for sale forfeits the relief

The reason sits in how HMRC treats a binding contract for sale that exists when someone dies. Where the deceased was already bound to sell an asset, and the buyer bound to buy, the estate is treated as passing the benefit of that contract — in substance, the money — rather than the asset. For business property relief, that recharacterisation is fatal: the thing passing is no longer qualifying business property.

HMRC sets out its approach to business property relief in its Inheritance Tax Manual, which anyone can read on gov.uk. The distinction it draws is not about the paperwork's title but about whether, at the date of death, a binding obligation to buy and sell was already in place. A document headed “cross option agreement” that in fact obliges both sides to complete is treated as a contract for sale despite its name; a genuine set of reciprocal options is not.

This is the same trap examined from the estate's side in our piece on how a buy-and-sell clause can cost the estate business relief. The lesson from both directions is identical: the words on the page decide the tax, so they have to be the right words.

How reciprocal cross options avoid the problem

A cross option agreement, sometimes called a double option, works by granting two separate rights rather than one obligation.

Each shareholder grants the others an option to buy their shares on death — a call option. In return, the estate is granted an option to require the survivors to buy those shares — a put option. If either side exercises its option, the other is obliged to complete, so the commercial outcome is reliable: the shares will change hands and the estate will be paid. But until an option is actually exercised, neither side is bound to do anything. At the date of death, therefore, no contract for sale exists, and the shares are still shares in the estate's hands.

That is the whole trick. The survivors get the certainty that they can secure the shares rather than end up in business with the deceased's family. The family gets the certainty that they can turn the shares into money rather than being stuck with a minority holding in a company they have no part in. And the estate keeps its claim to business property relief, because nothing had converted the shares into cash before death. It is a genuinely elegant solution to a problem that a blunter obligation makes worse.

The funding has to match the agreement

An option to buy is only as good as the money behind it. If the survivors have the right to buy but no way to pay, the agreement is a promise nobody can keep, and the family waits. This is why shareholder protection is usually built as two halves that must fit together: the legal agreement, and the life cover that funds it.

Three things in particular have to line up. The amount of cover needs to reflect a realistic valuation of the shares, or the survivors will be short. The valuation basis in the agreement and the sum assured need to move in step, so the payout roughly tracks what the shares are actually worth when the time comes. And the option period — the window in which the options can be exercised — needs to align with when the money becomes available, so the deal can complete while the cover is in hand. The policies are usually written in trust for the other shareholders, so the proceeds reach the right people quickly and do not simply swell the estate of the person who died. The tax treatment of the premiums where the cover sits alongside employment is a separate question, touched on in our piece on why a relevant life premium is not a benefit in kind.

If you are putting this in place, or checking that an old agreement still stacks up, you can get life insurance quotes and have an FCA-authorised broker size the cover against a current valuation, while your solicitor and accountant confirm the agreement and the tax. What any insurer offers depends on underwriting, so nothing here is a promise of cover.

Where these agreements go wrong in practice

Put the failure points together and a pattern emerges. The agreement that quietly obliges both sides to complete, so it reads as a contract for sale and loses the relief. The valuation basis that has not been reviewed in years, so the cover no longer matches the shares. The agreement that conflicts with the company's articles, which usually govern the share register and can block or reroute a transfer the agreement assumed. And, most common of all, the agreement that was drafted but never funded, or never signed.

That last one is where families get hurt. Without a funded, signed agreement, the survivors and the estate are left to negotiate from scratch in the middle of grief, and the shares can end up with people who have no role in the business, as in our piece on the shares that went to the widow along with the office. A related restriction can catch a family the other way, forcing a sale they did not want, which is the subject of how pre-emption clauses can force your family to sell. The through-line is that the agreement, the articles and the funding all have to be read together, because a gap in any one of them undoes the other two.

Scotland and Northern Ireland

Inheritance tax and business property relief are set by the UK Parliament and apply across the United Kingdom, so the core point — that a binding contract for sale risks the relief while reciprocal options do not — holds the same in Scotland and Northern Ireland as in England and Wales. Company law governing the shares and the articles is UK-wide too.

What can differ in practice is the trust that holds the funding policy and the general law of contract behind the agreement, both of which have their own features in Scotland. That is a reason to have the documents drafted for the jurisdiction the shareholders live in, so the intended treatment actually holds, rather than a reason the strategy changes. The rest of this topic is gathered in our guide to what dies with a business owner.

Frequently asked questions

Why use a cross option agreement rather than an obligation to sell?

Because a binding contract for sale in place at the date of death can cost the estate business property relief on the shares, by treating what passes as a right to cash rather than as business property. Reciprocal options, where each side can require the other to deal but neither is obliged until an option is exercised, achieve the same commercial result without creating that contract for sale.

How does a cross option agreement work?

Each shareholder grants the others an option to buy their shares on death, and the estate is granted an option to require the survivors to buy. Whichever side exercises its option, the sale then goes ahead and completes, but until one of them does, no contract for sale exists between them, so the shares remain shares in the estate's hands.

Does the funding policy need to match the agreement?

It should. The cover, the valuation basis and the option period all need to line up, so the money is available while the option can still be exercised and roughly matches what the shares are worth. The policies are usually written under trust so the proceeds reach the right hands quickly rather than adding to the estate of the person who has died.