Business relief for inheritance tax: the basics

The essentials

Business relief (you will also see it called business property relief, or BPR) reduces the value of a business or its assets when inheritance tax is worked out, by either 100% or 50% depending on the asset. Whether an estate actually gets it turns on three separate tests. Ownership: the deceased must normally have held the asset for at least two years. Activity: the business must be a genuine trading business, not an investment vehicle. Paperwork: the executor must positively claim the relief on the estate's inheritance tax forms, because HMRC does not apply it for you. Since 6 April 2026 there is also a ceiling: 100% relief is capped at £2.5 million of combined business and agricultural property per person, with 50% relief on value above that line.

This article explains each piece in plain English for business owners planning ahead and for executors dealing with an estate that includes a business. It is written for England and Wales, although inheritance tax itself runs on the same statute across the whole of the UK, and it is general information rather than legal or financial advice. Before relying on business relief, it is worth checking your baseline position with our IHT threshold calculator, because relief only matters once an estate is over its nil-rate band and other allowances.

What business relief is, and the two rates

Inheritance tax is normally charged at 40% on the value of an estate above its allowances. Without a relief, the family of someone who built a £2 million trading company could face a bill approaching £800,000, often payable before they can access the very asset being taxed. Business relief exists so that a working business does not have to be broken up or sold just to settle the tax. GOV.UK's business relief guidance describes it simply: the relief reduces the value of a business or its assets when working out how much inheritance tax has to be paid.

Which rate applies depends on what the deceased owned, per the GOV.UK page on what qualifies:

Asset	Rate of relief
A business, or an interest in a business (a sole trade or a partnership share)	100% (within the £2.5m allowance from 6 April 2026)
Shares in an unlisted company	100% (within the £2.5m allowance from 6 April 2026)
Shares 'not listed' on a recognised stock exchange, e.g. AIM shares	50% from 6 April 2026
Shares controlling more than 50% of the voting rights in a listed company	50%
Land, buildings or machinery owned personally but used in a business the deceased was a partner in or controlled	50%
Land, buildings or machinery used in the business and held in a trust it has the right to benefit from	50%

A detail that catches many families: an owner who holds the trading premises personally and lets the company use them gets only 50% relief on the building, while the company shares themselves can attract 100%. How assets are held matters as much as what the business does.

The two-year ownership test

To qualify for either rate, the deceased must normally have owned the business or asset for at least 2 years before they died. There is no partial relief for eighteen months of ownership; the test is pass or fail. Two softenings are worth knowing about. Where a qualifying asset replaced another qualifying business asset (selling one trading company and buying another, for example), the ownership periods can sometimes be combined. And where a spouse or civil partner inherits a business asset on death, they can normally count their late partner's ownership period towards their own two years. A newly incorporated venture, or shares bought eighteen months before death, will usually fail the test outright.

Trading, not investment: the test that decides most claims

This is where most refused claims die. GOV.UK is blunt about it: you cannot claim business relief if the business "mainly deals with securities, stocks or shares, land or buildings, or in making or holding investments". Nor does relief apply to a not-for-profit organisation, or to a business that is being sold or wound up at the date of death (unless the sale is to a company that will carry the business on, or the winding up is part of a process that lets the business continue).

The word doing the heavy lifting is "mainly". HMRC looks at the business in the round: turnover, profit, time spent, capital employed. In practice:

• Usually qualifies: a manufacturing company, a builder, a shop or restaurant, a haulage firm, a consultancy or agency, a trading farm business, a company that develops property for sale (developing is trading; holding is investing).
• Usually refused: a portfolio of buy-to-let properties, even inside a limited company and even where the owner works on it full time (letting is making or holding investments); a company that mainly holds shares or other securities; a furnished holiday-let business, which HMRC treats as investment in all but exceptional, hotel-like cases; a dormant company sitting on cash.
• The grey zone: mixed businesses, such as a farming company with let cottages, or a trading company with a large rental sideline. Relief follows the "mainly" test on the whole business, so the balance of activities decides everything.

Even inside a qualifying trading company, excepted assets can be carved out of the relief: assets not used wholly or mainly for the business, with large surplus cash balances the classic example. A trading company holding £900,000 of cash it has no business need for may find relief restricted on that slice. And a binding contract for sale at the date of death is fatal: the estate then owns a right to sale proceeds, not a business.

What changed on 6 April 2026: the £2.5 million allowance

Until 5 April 2026, 100% business relief was unlimited: a qualifying £20 million trading company passed entirely free of inheritance tax. For deaths on or after 6 April 2026, the current GOV.UK guidance confirms that "100% relief is capped at £2.5 million for qualifying business or agricultural property". The key features:

• One combined allowance. The £2.5 million covers business property and agricultural property together, applied proportionately across whatever qualifying assets the estate holds. An estate with both a farm and a trading company does not get £2.5 million for each; the two reliefs share the pot. Our companion guide to agricultural relief covers the farming side of the same reform.
• 50% relief above the cap. Qualifying value over £2.5 million still gets 50% relief, which means an effective inheritance tax rate of 20% on the excess rather than the full 40%.
• Transferable between spouses. Unused allowance can pass to a surviving spouse or civil partner, giving a couple up to £5 million of combined 100% relief. Where the first spouse died before 6 April 2026, the full £2.5 million allowance can still be transferred to the survivor's estate.
• AIM and other 'not listed' shares move to 50%. Shares designated as not listed on the markets of a recognised stock exchange lost their 100% rate. Their 50% relief sits outside the allowance, so an AIM portfolio does not eat into the £2.5 million available for a trading business. This affects a different group of readers entirely: people who bought AIM shares specifically as an inheritance tax shelter now hold an asset relieved at half the old rate, and reviewing that position is a matter for an FCA-authorised financial adviser, not for a general article.

One point of frequent confusion, because older articles still carry it: when the reform was first announced in October 2024, the allowance was set at £1 million and was not going to be transferable between spouses. Before the rules took effect the figure was increased to £2.5 million and transferability was added. If you have seen "£1 million cap" in coverage from 2024 or 2025, it is the superseded announcement, not the rule now in force. The original announcement also included anti-forestalling: lifetime transfers made on or after 30 October 2024 fall under the new rules if the donor dies on or after 6 April 2026, so large gifts made in that window are not automatically grandfathered under the old unlimited relief.

A worked example

Take a widow who dies in June 2026 owning a qualifying trading company worth £4 million, which she founded twenty years ago and leaves to her daughter. Her late husband's estate used none of his allowance, so it transfers to her.

• Combined 100% allowance: £2.5 million + £2.5 million transferred = £5 million, comfortably above the company's value. The full £4 million gets 100% relief and the company passes tax free.

Now change one fact: she was single, with only her own £2.5 million allowance.

• First £2,500,000 of the company: 100% relief, no tax.
• Remaining £1,500,000: 50% relief, leaving £750,000 chargeable.
• Tax on that slice at 40%: £300,000, an effective 20% rate on the value above the cap (her nil-rate band would be set against the rest of her estate first).

Same company, same daughter, £300,000 of difference depending on the allowance position. Before 6 April 2026 the answer in both cases was zero. That is the reform in one example, and it is why estates around and above the £2.5 million mark now need to think about valuation and structure in a way they never did.

How executors claim: IHT400 and schedule IHT413

Business relief is not applied automatically. The executor or administrator claims it by completing form IHT400 (the full inheritance tax account) together with schedule IHT413 (business or partnership interests and assets). The business must be valued at open market value, which for a private company usually means a professional valuation of the shares rather than the balance-sheet figure. An estate claiming business relief will be using the full IHT400 route rather than the excepted-estates shortcut; our IHT400 walkthrough explains how that reporting route works, and our probate pillar guide covers where the tax account sits in the wider administration timeline.

Executors should expect HMRC to test the claim: accounts for the last few years, the balance of trading versus investment activity, cash levels and how the assets were used. Keeping (or requesting from the company) clean records of what the business actually does is the cheapest insurance a claim can have. Note that lifetime gifts of business assets have their own rules: broadly, the recipient must usually keep the asset as a going concern until the donor's death for relief to survive on a gift within seven years, and gifts made more than 7 years before death fall out of the estate altogether.

Where this fits in your planning

For a business owner, the questions are now sharper than they were: does the business pass the trading test, how is the premises held, how much surplus cash is inside the company, and does the combined value of business and agricultural property sit above £2.5 million (or £5 million for a couple)? For an executor, the job is to identify every potentially qualifying asset, get proper valuations, and claim on IHT413 with evidence ready. Our business owners hub collects the wider estate issues for this audience, and the inheritance tax pillar guide sets out the framework the relief sits inside.

Business relief is one of the most valuable reliefs in the inheritance tax system and one of the easiest to lose on a technicality. For any estate near the £2.5 million line, two judgement calls decide the outcome: whether the business clears the trading-versus-investment test on the balance of its activities, and what it is genuinely worth on the open market. Both are exactly the points HMRC probes, and both can be strengthened during the owner's lifetime through how the business is structured, where the premises sit and what the records show. If your business, or the estate you are administering, sits anywhere near the allowance or carries any investment flavour, we can put you in touch with a specialist in business valuation and estate structuring who can test your position against the rules now in force.