Inheritance Tax When You Sell Your Company: What Happens to Business Relief

An owner's estate can look well protected from inheritance tax right up to the day a sale completes. Then, overnight, the company shares are replaced by cash. That change can expose a large part of your wealth to a 40% charge. Knowing how it happens gives you the chance to plan around it.

Business Relief on company shares

Business Relief, sometimes called Business Property Relief, reduces the value of qualifying business property for inheritance tax. Shares in an unquoted trading company can qualify if the conditions are met, including a minimum period of ownership.

A few points to remember:

• Trading status counts. A company whose main activity is holding investments does not qualify.
• Surplus cash can reduce the relief. Cash and investments the business does not need may be treated as excepted assets, which attract no relief.
• Holding companies can qualify where the group's business is trading.

Why the relief usually ends on a sale

Relief attaches to the shares, not to what they are worth in another form. After the sale:

• The cash proceeds are not business property, so no relief applies.
• Most things you might buy with the cash, such as funds, listed shares or let property, usually do not qualify either.
• If a holding company sells its trading subsidiary and keeps the cash, it is likely to become an investment company, and its own shares may stop qualifying.

You can lose relief even before completion. Once a binding contract for sale exists, the shares may cease to qualify, which affects the timing of any gift or trust planning.

The upshot is that an estate which was largely sheltered can become exposed to inheritance tax at 40% on the proceeds.

The change from 6 April 2026

From 6 April 2026, 100% Business Relief is capped at the first £2.5 million of combined qualifying business and agricultural property for each person. Qualifying value above that receives 50% relief, which means it bears tax at half the usual rate.

This narrows the gap between holding shares and holding cash for some sellers, but it does not close it. The first £2.5 million can still be fully relieved, and the excess is still taxed at only half the usual rate while it qualifies. After a sale, cash is usually fully exposed. The reform also changes how relief operates for trusts and lifetime gifts, so existing plans deserve a fresh look.

Planning before the sale

You have the most choices while the shares still qualify.

• Timing of gifts. A gift of qualifying shares made before a binding sale contract can be covered by relief, subject to the new limit. A gift after that point may not be.
• Gifts to individuals. These can leave your estate if you survive seven years. However, where you die within that period, relief on the gift can depend on the recipient still holding qualifying property, which may not be so if the shares have been sold.
• Trusts. Placing qualifying shares in a trust before the sale can use the relief at the time of the gift. Trusts bring their own capital gains tax and inheritance tax rules, so take specific advice.
• Capital gains tax on gifts. A gift is usually a disposal at market value. Holdover relief may be available for business assets, but it interacts with the later sale and with Business Asset Disposal Relief, so model it first.
• Keeping some value in qualifying assets. Accepting part of the price in shares in the buyer may keep some value within qualifying property, depending on the buyer and the terms.

Beware gifts from which you continue to benefit, as they can be ineffective for inheritance tax. Any plan must also leave you enough income to live on.

Planning after the sale

Once the sale has completed, attention turns to the cash.

• Reinvesting in qualifying business property. Investing in unquoted trading companies can bring assets back within relief. A minimum holding period usually applies, and these investments carry genuine commercial risk.
• Outright gifts. Gifts to family can leave your estate if you survive seven years. Life insurance is sometimes used to cover the tax if you do not.
• Trusts. These offer more control than outright gifts, but gifts of cash into most trusts can trigger an immediate charge above set limits.
• A Family Investment Company. A company owned by family members and funded with part of the proceeds can keep future growth outside your estate while you retain control. It does not usually give immediate relief on the value you put in.
• Wills and pensions. Update your will and review how your pension and other assets will pass.

These pieces work together, not separately. Your investment strategy, income needs and tax planning have to fit, which is why coordination with your wealth manager or financial planner is important.

The replacement property rule

In limited cases, relief can carry on after a sale. If you reinvest the proceeds in other qualifying business property within a short window, the replacement rules can allow relief to continue, taking your holding period in the original shares into account. In practice this is narrow. The new asset must itself qualify, the time limits are strict, and a portfolio of listed shares or let property will not usually work. It is most relevant to owners who intend to buy into another trading business soon after selling.

If you plan to leave the UK

Since April 2025, inheritance tax has depended on long-term residence rather than domicile. Someone who has lived in the UK for a long time can remain within the scope of UK inheritance tax for some years after leaving, so moving abroad does not remove the exposure immediately.

A five-step approach

1. Review your inheritance tax position before heads of terms are signed, while the shares still qualify.
2. Check the timing of any gifts or trusts against the expected date of a binding contract.
3. Consider whether part of the price can stay in qualifying assets.
4. Plan the use of the proceeds with your tax adviser and wealth manager together.
5. Update your will and estate plans once the sale completes.

Book a call with our team

Inheritance tax planning around a sale is time-sensitive, because some options close the moment a contract becomes binding. Our team can look at your estate, the likely timetable and the options open to you. All advice is prepared by our specialist team and reviewed by a Chartered Tax Adviser. Book a call with our team early and we will help you plan before the deal is agreed.

This article is general information, not advice. Tax rules change and their effect depends on your circumstances. Please speak to us before acting.

For a closer look at selling or buying a business, see our specialist practice, Transaction Tax Partners.