BPR £1m Cap 2026: What UK Family Businesses Must Do Now

The most consequential change to UK business succession in a generation

From 6 April 2026, Business Property Relief (BPR) on qualifying unquoted trading-company shares is capped. The first £1m of qualifying business assets per individual continues to receive 100% relief. Value above the cap receives 50% relief - an effective inheritance tax rate of 20% on the excess, payable over up to ten years.

For most UK family-business owners, this is not a marginal tweak. It is a structural change to how wealth passes to the next generation, and it puts the valuation of the business - the number the whole plan turns on - at the centre of every succession conversation.

What actually changes on 6 April 2026

The reform, announced at Autumn Budget 2024 and legislated in Finance Act 2025, works as follows:

Every individual receives a new £1m allowance for 100% BPR and Agricultural Property Relief combined.
The allowance is per person, not per business. It cannot be transferred between spouses on first death; unused allowance is lost.
Above £1m, qualifying assets attract 50% relief instead of 100%, producing an effective IHT rate of 20% on the excess.
The same 50% rate now applies to shares listed on AIM regardless of value, including for the first £1m.
IHT on the taxable slice may be paid in ten equal annual instalments, interest-free where the business qualifies.

The change applies to deaths, lifetime transfers and trust charges from 6 April 2026 onward. Anti-forestalling rules apply to certain gifts made on or after 30 October 2024 where the donor dies after 5 April 2026.

A worked example: a £6m family manufacturing business

Consider a founder holding 100% of a qualifying trading company valued at £6m, dying after 6 April 2026 with no other business assets and no lifetime gifts inside the seven-year window.

Pre-reform (before 6 April 2026)

Item	Amount
Value of shares	£6,000,000
BPR at 100%	(£6,000,000)
Chargeable to IHT	£0
IHT payable	£0

Post-reform (from 6 April 2026)

Item	Amount
Value of shares	£6,000,000
100% BPR on first £1m	(£1,000,000)
50% BPR on remaining £5m	(£2,500,000)
Chargeable to IHT	£2,500,000
IHT at 40%	£1,000,000

A £1m tax bill has appeared on a business that previously passed IHT-free. That £1m must be found without forcing a sale of the trading business - which is why the valuation number, and the plan that responds to it, matters more than ever.

Why the valuation is now the fulcrum of the plan

Every meaningful succession decision after 6 April 2026 flows from the valuation:

How large is the taxable slice. The IHT exposure is a direct function of the value above £1m. A £500,000 movement in the valuation is a £100,000 swing in IHT.
Whether lifetime gifting makes sense, and how much. Potentially exempt transfers (PETs) fall out of the estate after seven years, but only if the donor survives. Sizing a gift requires a defensible valuation at the date of gift, not an aspirational one.
What insurance is required. Whole-of-life policies written into trust to fund the IHT bill are priced from the expected liability, which is priced from the valuation.
Whether a freeze-and-growth restructure is worth the effort. Freezing the current value in a class of shares held by the senior generation and channelling future growth into a new class held by the next generation is a proven way to cap the founder's IHT footprint. It only works if the freeze valuation is defensible.

The pre-2026 world tolerated informal valuations because the answer was almost always "no IHT". The post-2026 world does not.

The four planning routes and what each requires

1. Do nothing and pay the tax

Realistic for smaller businesses where the taxable slice, and therefore the IHT bill, is manageable from trading cash flow or the ten-year instalment plan. Requires a current valuation to confirm the slice is small enough to make this a live option.

2. Lifetime gifting into the seven-year window

Gifts of shares are PETs. Survive seven years and the value falls out of the estate entirely. Between three and seven years, taper relief applies. The valuation at the date of gift sets the baseline; if HMRC challenges the valuation later, an unprepared family faces a retrospective fight at the worst possible time. A contemporaneous independent valuation is the single best protection.

3. Freeze-and-growth restructure

The founder exchanges ordinary shares for a new class that participates only up to today's value; a new growth class captures all future upside and is issued to the next generation. Executed correctly, the founder's estate stops growing with the business.

Requirements:

A defensible valuation as at the freeze date - the whole structure sits on this number.
Section 431 elections within 14 days where employees or family employees receive growth shares.
HMRC clearances under s.138 TCGA 1992 (share exchange) and s.701 ITA 2007 (transactions in securities).

See our separate guide on freeze-and-growth reorganisations for the mechanics.

4. Trust structures

Discretionary trusts remain a valid succession tool but face their own IHT regime (entry charge, ten-year charges, exit charges). Post-reform, the interaction between the £1m allowance and the trust regime requires modelling on real numbers. A generic template does not survive first contact with HMRC.

Common mistakes we already see in 2026

The reform has surfaced planning errors that were previously masked by unlimited 100% relief:

Using a book value or an accountant's "back-of-envelope" number. These figures were rarely stress-tested because they had no tax consequence. They now do.
Assuming the £1m allowance is transferable between spouses. It is not. Failing to use each allowance in life or on first death permanently wastes it.
Gifting shares without documenting the valuation. A PET made in 2026 that becomes chargeable in 2032 will be re-valued by HMRC at the 2026 date. Without a contemporaneous file, the family loses control of the number.
Ignoring debt-like items and shareholder loans in the valuation. Post-reform, a £500,000 shareholder loan sitting inside the equity value can produce a real IHT overpayment.
Treating investment assets as trading. BPR applies to trading businesses. Excepted assets - surplus cash, investment property, non-trading subsidiaries - are stripped out. A valuation that does not identify them invites an HMRC re-computation.

What a defensible 2026 valuation looks like

An HMRC-ready valuation in the post-reform world is not a one-page number. It contains:

A stated valuation date and stated purpose (BPR / lifetime gift / freeze).
The methodology applied (earnings, assets, hybrid) and why.
Normalised EBITDA with each adjustment evidenced.
The multiple used, with reference to genuinely comparable transactions.
Explicit treatment of excepted assets and shareholder loans.
Where relevant, the minority and marketability discounts applied and their justification.
A clean signed report the family can produce years later.

That report is the document a family needs the moment an HMRC enquiry lands - which, in the post-2026 regime, will happen more often and on smaller estates than ever before.

The window is now, not later

The reform's economic weight is concentrated on families who wait. Every year the valuation grows, the taxable slice grows with it. The families protecting the most value are those who took three steps in the twelve months around 6 April 2026:

1. Commissioned an independent valuation of the trading business.

2. Modelled the IHT exposure and the ten-year instalment cash flow against real trading numbers.

3. Chose a route - gifting, freeze, insurance, or a combination - and documented the valuation supporting it.

The £1m cap is legislated. The valuation is the one variable owners still control. Getting it right, and getting it in writing now, is the single highest-return succession decision available to UK family-business owners in 2026.