Inheritance tax after selling your business: the relief you lose when shares become cash

For many business owners, the company is their largest asset. While it's an unquoted trading company, it may be largely sheltered from inheritance tax. Sell it for cash and that shelter usually disappears. The capital gains tax gets the attention during a sale, but the inheritance tax effect can be just as large.

Business Relief on trading company shares

Business Relief, often 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 holding the shares for a minimum period.

Points to be aware of:

• Trading status matters. A company whose activities are mainly holding investments doesn't qualify.
• Surplus cash can reduce relief. Cash and investments not needed for the business may be treated as excepted assets, which don't attract relief.
• Holding companies can qualify where the group's business is trading.

Why relief usually stops when you sell

Relief applies to the shares, not to their value in another form. Once the shares are sold:

• the cash proceeds are not business property, so they don't qualify
• most investments bought with the proceeds, such as funds, listed shares or let property, usually don't qualify either
• if a holding company sells its trading subsidiary and keeps the cash, it is likely to become an investment company, and its shares may no longer qualify

Relief can also be lost before completion. Once there is a binding contract for sale, the shares may stop qualifying. This affects the timing of any gift or trust planning.

The result is that an estate which was largely protected before the sale can be exposed to inheritance tax at 40% on the proceeds afterwards.

The reform from 6 April 2026

From 6 April 2026, 100% Business Relief is limited to the first £2.5 million of combined qualifying business and agricultural property per person. Qualifying value above that receives 50% relief, so it is taxed at half the usual rate.

For many sellers, this narrows the gap between holding the shares and holding cash. But it doesn't remove it. The first £2.5 million can still be fully relieved, and the rest is still only taxed at half the usual rate while it qualifies. After a sale, cash is usually fully exposed.

The reform also changes how relief works for trusts and lifetime gifts, so existing plans may need a fresh look.

Planning before the sale

The most options are available while the shares still qualify. Points to consider:

• Timing of gifts. A gift of qualifying shares made before a binding contract for sale can be covered by relief, subject to the new limit. A gift made after may not be.
• Gifts to individuals. These can fall out of your estate if you survive seven years. But relief on a lifetime gift can depend on the recipient still holding qualifying property if you die within that period, which may not be the case if the shares are then sold.
• Trusts. Putting qualifying shares into a trust before the sale can use relief at the time of the gift. Trusts have their own capital gains tax and inheritance tax rules, so this needs careful advice.
• Capital gains tax on gifts. A gift is usually treated as 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. Taking part of the price in shares in the buyer may keep some value in qualifying property, depending on the buyer and the terms.

Gifts you continue to benefit from can be ineffective for inheritance tax. Any plan should be practical for your income needs, not just tax efficient.

Planning after the sale

Once the sale completes, the focus moves to the proceeds. Common options include:

• Reinvestment in qualifying business property. Investing in unquoted trading companies can bring assets back within relief. A minimum ownership period usually applies, and these investments carry real commercial risk.
• Outright gifts. Gifts to family can fall out of your estate if you survive seven years. Life insurance is sometimes used to cover the tax if you don't.
• Trusts. These can give more control than outright gifts. Gifts of cash into most trusts can trigger an immediate inheritance tax charge above certain limits, so the amounts and structure matter.
• Family investment companies. A company owned by family members, funded with some of the proceeds, can keep future growth outside your estate while you keep control. It doesn't usually give immediate relief on the value you put in.
• Pensions and wills. Updating your will, and reviewing how pension and other assets pass, should be part of the same exercise.

None of these work well in isolation. The investment strategy, your income needs and the tax planning have to fit together, which is why coordination with your wealth manager or financial planner matters.

The replacement property rule

In some cases, relief can continue after a sale. Where proceeds are reinvested in other qualifying business property within a limited time, the replacement property rules can allow relief to carry on, taking account of how long you held the original shares.

This is narrow in practice:

• the new investment must itself be qualifying business property
• the time limits and conditions are strict
• buying a portfolio of listed shares or let property won't usually work

It is most relevant to owners who plan to buy or invest in another trading business soon after selling.

Leaving the UK

Some sellers plan to move abroad after a sale. Since April 2025, inheritance tax has been based on long-term residence, not 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 doesn't remove the exposure straight away.

What to do

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 some of the price could 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.

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