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Inheritance tax for business owners now turns on where your company sits against that allowance. Unused allowance passes to a surviving spouse, so a couple can cover up to £2 million of combined business and agricultural assets at 100% relief. AIM shares sit outside the allowance, at 50% relief in every case.
Key Takeaways
- From 6 April 2026, 100% Business Relief is capped at £2.5 million per person, shared with Agricultural Relief.
- Value above the allowance gets 50% relief, an effective inheritance tax rate of 20%.
- Unused allowance transfers to a surviving spouse, giving a couple up to £5 million at 100% relief.
- AIM shares get 50% relief only, and neither use nor benefit from the allowance.
- A buy and sell clause in a shareholders’ agreement removes the relief under Inheritance Tax Act 1984, Section 113. We normally recommend clients set up a cross-option agreement drafted by a qualified solicitor. Bluebond can coordinate this with a qualified solicitor employed within our business.” (SRA fix from earlier audit).
What is the difference between Business Relief and Agricultural Relief?
Business Relief covers trading businesses: sole trades, partnership interests and unquoted trading company shares. Agricultural Relief covers the agricultural value of farmland and farm buildings. From 6 April 2026 the two share a single £2.5 million allowance for 100% relief per person, under the changes announced in the 30 October 2024 Autumn Budget.
Which business assets qualify for Business Relief?
Business Relief applies to trading businesses, not investment businesses. Qualifying assets include a sole trade, a partnership interest, and unquoted trading company shares. Under the Inheritance Tax Act 1984, Section 105(3), a business consisting wholly or mainly of making or holding investments is excluded.
Two years of ownership is the standard condition before death or transfer. The clock restarts if you sell one business and buy another.
Mixed businesses are the grey area. A trading company holding surplus cash or property let can still qualify overall, but the excepted assets rule in Section 112 strips relief from assets not used in the trade. Claims go on form IHT413.
How does the £2.5 million allowance change inheritance tax for business owners?
The 100% relief allowance caps relief at £2.5 million per person, covering business and agricultural combined. Value above it qualifies for 50% relief, an effective 20% inheritance tax charge. Unused allowance transfers between spouses, for deaths on or after 6 April 2026 — so a married couple can cover up to £5 million at 100% relief.
The allowance behaves like the nil-rate band allowance, covering death transfers plus qualifying gifts in the previous seven years. Trusts get their own allowance.
Take a £6 million holding in an unquoted trading company, one shareholder, no gifts. The first £2.5 million gets 100% relief. The remaining £3.5 million gets 50% relief, leaving £1.75 million chargeable. At 40%, that is £700,000 of tax, assuming the nil-rate band is used elsewhere. Before 6 April 2026 the same holding passed tax-free.
A late spouse’s unused allowance can be claimed by the survivor’s estate. HMRC treats the full £2.5 million as available where that death preceded 6 April 2026, giving the survivor up to £5 million at 100% relief in total.
Which shares no longer qualify for 100% Business Relief?
Shares traded on a market HMRC does not treat as listed receive Business Relief at 50% in every case, for deaths on or after 6 April 2026. AIM shares fall into this category. They neither consume the £2.5 million allowance nor benefit from it.
Relief at 50% means an effective 20% charge. On a £1 million AIM portfolio, that is £200,000. However, it is not just the tax that is the question. AIM shares are an investment class with distinct risk characteristics. This article does not provide investment advice. Any decision to hold or sell AIM shares — including how they fit alongside inheritance tax planning — should be discussed with an FCA-authorised investment adviser. Bluebond Tax Planning Ltd is not FCA-authorised.
How a shareholders’ agreement can cancel Business Relief on death
A binding contract for sale removes business from relief. Under the Inheritance Tax Act 1984, Section 113, a business subject to a binding contract for sale at the time of transfer is not “relevant business property” and does not qualify for the relief. HMRC treats a buy and sell clause in a shareholders’ agreement as exactly that.
Statement of Practice 12 (1980) sets out the position. Relief is denied where the agreement requires your personal representatives to sell and the surviving owners to buy. Both obligations defeat the claim.
Cross-option agreements are treated differently. Each side holds an option, not an obligation, so no binding contract exists at the date of death and the relief survives. A qualified solicitor employed within our business can help draft these documents on your behalf. Bluebond Tax Planning Ltd is not an SRA-authorised law firm.
The difference is invisible commercially. The policy still pays out and the family gets the cash. The relief is lost on the whole holding.
What most business owners get wrong about Business Relief
Business Relief is conditional, not a permanent feature of owning a company. It is tested at the moment of death or transfer, and the conditions can be broken years earlier by a routine commercial decision.
Surplus cash retained on the balance sheet, a wind-down before a sale, or an agreement drafted for commercial clarity can move your position. Most Bluebond clients who complete the full IHT Mitigation Plan legitimately reduce their inheritance tax liability substantially — often to nil — through early review of ownership, control and succession decisions. Individual outcomes depend on personal circumstances.
Valuation matters too. Above the allowance, HMRC has reason to scrutinise a figure rarely contested before. Individual cases need personalised review.
What to Avoid
- Signing an agreement obliging your estate to sell and the survivors to buy.
- Assuming surplus cash and property let are covered.
- Treating AIM holdings as an inheritance tax shelter after 6 April 2026.
- Missing the deadline to claim a late spouse’s unused allowance.
- Relying on an untested company valuation.
Frequently asked questions
Property & Business
How is inheritance tax paid if the family cannot sell the business?
Inheritance tax on a business the family cannot sell can be paid over 10 equal annual instalments, interest-free, for deaths on or after 6 April 2026. The option covers assets eligible for Business Relief or Agricultural Relief. Interest runs only on late instalments.
Do buy-to-let properties qualify for Business Relief?
Buy-to-let properties do not qualify for Business Relief. Under the Inheritance Tax Act 1984, Section 105(3), a business consisting wholly or mainly of making or holding investments is excluded. A residential letting portfolio is an investment business, however actively it is run. However, a business which develops property and imminently sells them on without rental agreements would qualify for business relief. So ensure you do not mix the two different activities in one company.
Where this leaves you
Business Relief remains valuable for UK trading businesses. It is now capped, and capped reliefs reward owners who know where they stand. Bluebond’s free webinar covers how owners are restructuring after the reforms. For the numbers on your own company, the IHT Mitigation Plan sets them out.
You should work with advisers who coordinate financial planning, tax advice and legal work under one client relationship — with clear disclosure of who is regulated for what. Bluebond Tax Planning provides tax planning and coordination; will and trust drafting is carried out by qualified solicitors employed within our business; and regulated financial advice on your investments, personal pension or annuity is referred to our independent FCA-authorised partner firm. No company in the Bluebond group is FCA-authorised or an SRA-authorised law firm — this coordination is our way of removing conflicts of interest, not a claim to hold every regulatory permission in-house.
If you need any help or advice in this complex area please contact us. We will help you mitigate your inheritance tax.
Disclaimer. The information in this article is general in nature and does not constitute personal financial, tax, or legal advice. UK tax legislation changes frequently, and the specific application of any rule or strategy depends on individual circumstances. Bluebond Tax Planning Ltd provides tax planning and coordination only; will and trust drafting is carried out by qualified solicitors employed within our business; and any advice on your investments, personal pension or annuity is FCA-regulated and referred to our independent partner firm — no company in the Bluebond group is FCA-authorised or an SRA-authorised law firm.
