Business Property Relief Explained

Business Property Relief (BPR) is an inheritance tax relief that can reduce the taxable value of qualifying business assets by either 100% or 50%, provided you have owned them for at least two years. Where it applies in full, a trading business, an interest in a partnership, or shares in an unquoted trading company can pass on death with little or no inheritance tax to pay. From 6 April 2026, however, the most generous 100% rate is capped at a combined £1 million of agricultural and business property per person, with anything above that getting only 50% relief. Understanding both the relief and the new limit is essential for anyone with business wealth in England and Wales.

What is Business Property Relief?

BPR is a relief under the Inheritance Tax Act 1984 that reduces the value of "relevant business property" when working out inheritance tax, whether on death, on lifetime gifts that fail the seven-year test, or on charges within certain trusts. The policy purpose is to stop a family business or trading company having to be broken up or sold simply to pay an inheritance tax bill. Because it can remove an asset from the IHT calculation entirely, BPR is one of the most valuable reliefs in the system — and one of the most closely examined by HMRC. For the wider picture of how the tax works, see our Inheritance Tax UK: Complete Guide.

How much relief do you get?

There are two rates of relief, depending on the type of asset:

• 100% relief on a business or interest in a business (for example, a sole trader's business or a partnership share), and on unquoted shares in a qualifying trading company.
• 50% relief on certain other assets, such as land, buildings, plant or machinery owned personally but used by a company you control or a partnership you are a member of, and on controlling shareholdings in fully listed companies.

These rates have applied for many years. The crucial change from 6 April 2026 is that 100% relief is no longer unlimited — see the section on the £1 million cap below. The relief reduces the chargeable value before the £325,000 nil-rate band and any residence nil-rate band are applied, so it stacks with, rather than replaces, your other allowances.

What property qualifies?

"Relevant business property" is defined narrowly. The main categories are a business or an interest in a business carried on for gain; unquoted (unlisted) shares and securities in a trading company; controlling holdings in listed companies; and land, buildings or machinery used by a company or partnership the deceased controlled. The business must be mainly trading. Relief is denied where the business consists "wholly or mainly" of dealing in land or buildings, dealing in shares or securities, or making or holding investments. This is why buy-to-let portfolios, investment companies and most property-letting businesses do not qualify, even though they are real commercial activities.

The 2-year ownership rule

To qualify, you must generally have owned the relevant business property for at least two years immediately before the transfer or death. There are limited exceptions — for example, where property replaced other qualifying property, or where it was inherited from a spouse who already met the condition (you can add their ownership period to yours). The two-year rule means BPR is not a quick fix: assets bought shortly before death will not attract relief. It rewards genuine, settled business ownership and is one of the first things HMRC checks on any claim.

The £1 million cap from April 2026

This is the most important recent reform. From 6 April 2026, the 100% rate of relief is limited to the first £1 million of combined agricultural and business property per person. Value above that £1 million allowance attracts only 50% relief — which means an effective inheritance tax charge of 20% on the excess (50% of the value is taxed at the 40% IHT rate).

A simple illustration: suppose someone dies after 6 April 2026 owning a qualifying trading business worth £2.5 million. The first £1 million benefits from 100% relief, so it is fully exempt. The remaining £1.5 million gets 50% relief, leaving £750,000 in the taxable estate. After allowances, that exposes a substantial sum to inheritance tax that would previously have been entirely relieved. The same £1 million allowance is shared with Agricultural Property Relief, so farming families who also run a trading business must spread one allowance across both. Crucially, and unlike the nil-rate band, this £1 million allowance does not transfer to a surviving spouse or civil partner — it is used or lost on each death — so couples cannot simply rely on the survivor inheriting a doubled allowance.

AIM shares and unlisted holdings

Shares traded on the Alternative Investment Market (AIM) are treated as unlisted for inheritance tax. Historically, holding qualifying AIM shares for two years could secure 100% BPR, which made AIM portfolios a popular estate-planning tool. From 6 April 2026, BPR-qualifying shares that are not listed on a recognised stock exchange — including AIM shares — get 50% relief only, an effective 20% IHT rate. They do not benefit from the £1 million 100% allowance. Anyone holding AIM shares specifically for inheritance tax planning should review that strategy, as the after-tax benefit is materially reduced.

Excepted assets and traps

Even where a business qualifies, BPR does not extend to "excepted assets" — broadly, assets that were not used wholly or mainly for the business in the two years before transfer, or not required for future business use. Large cash balances held well beyond the reasonable needs of the trade are a common target: HMRC may treat surplus cash as an investment and strip it out of the relief. Other traps include businesses that have drifted from trading into investment, recent changes of ownership that reset the two-year clock, and shareholders' agreements containing binding "buy and sell" clauses that can turn shares into a mere right to cash and jeopardise relief. Careful, regular review of the business's activities and balance sheet protects the claim.

Planning with BPR

BPR sits alongside other strategies for managing an estate. Because business property can be exempt while other assets are not, the order and structure of gifts matters — see How to Reduce Inheritance Tax and our note on Gifts and Inheritance Tax. Some families settle business property into trust to retain control while passing value down a generation; relief can apply on the way in and to the trust's own charges, but relevant property trusts bring a potential 20% entry charge above the nil-rate band, periodic charges of up to 6% every ten years and exit charges, as explained in Discretionary Trusts Explained. Wills should be drafted with BPR in mind: leaving relieved business assets directly to a spouse can "waste" the relief, because transfers between spouses are already exempt. A well-drafted will might instead direct business assets into a trust so the relief is captured. With the new £1 million cap that does not transfer between spouses, this kind of structuring is more important than ever.

When to take advice

BPR is technical, fact-sensitive and now subject to significant change. Whether a business is "mainly trading", whether cash is an excepted asset, whether ownership conditions are satisfied, and how the £1 million allowance interacts with agricultural property and with trusts are all areas where small details change the outcome and where HMRC frequently challenges claims. Because the new allowance applies per person and does not pass to a surviving spouse, wills and ownership often need restructuring so that each person's allowance is used. Given how much tax can turn on getting it right, anyone with meaningful business or agricultural wealth should take specialist, up-to-date advice from a qualified estate planner or tax adviser before relying on BPR or restructuring around it.