Who this is for: Business owners whose company is worth more than £5m and who have assumed that spousal transfer on death will protect the full estate from inheritance tax.
You always assumed your spouse would inherit the business tax-free. After all, spousal transfers are exempt from inheritance tax. The business would pass to your spouse on death without triggering a tax event. Your spouse would then benefit from their own BPR allowance when they eventually passed the business to the children.
The assumption was correct in principle. The maths did not work in practice.
How the BPR cap interacts with spousal inheritance
From April 2026, Business Property Relief is capped at £2.5 million per person for 100% relief. The unused portion of one spouse's BPR allowance is transferable to the surviving spouse, up to £5 million combined. Your company was worth £8 million.
Your spouse inherited your shares. The combined BPR allowance available to your spouse's estate was £5 million. The remaining £3 million of business value received only 50% relief, meaning £1.5 million was subject to 40% IHT. The tax bill was £600,000.
| Estate component | Value | BPR available | IHT exposure |
|---|---|---|---|
| Business (inherited by spouse) | £8,000,000 | £5,000,000 (combined allowance) | £1,500,000 at 50% relief |
| IHT at 40% on £1.5m | -- | -- | £600,000 |
What the new share class to children would have done
Had you issued the new share class to your children or a family trust when the business was worth £5 million, all future appreciation above £5 million would have accrued to them outside your estate, and outside your spouse's estate. The £3 million of growth from £5 million to £8 million would not have been in your spouse's estate at all. The BPR cap would have applied only to the frozen £5 million, with the combined spousal allowance covering it entirely.
The IHT bill: £0. The cost of the the new share class structure: approximately £5,000 to £10,000 in legal fees.
Spousal transfer exemption is not a complete IHT solution for business owners above the BPR cap. It defers the problem to the surviving spouse's estate. Growth shares issued before the value accrues are the mechanism that prevents the problem from arising at all.
Map Your Structure
If your business is worth more than £5m and your succession plan relies on spousal transfer, the audit will show you the IHT exposure that remains and the structure that eliminates it.
Run the Free Audit →What This Means for Your Position
The situations in this article are not edge cases. They are the default outcome for founders who operate without the architecture above their business. The audit maps your position in five minutes and tells you exactly which of these gaps apply to you.
The audit is free. The Discovery Call is a paid 30-minute working session. The £500 is credited in full against the Capital Architecture.
The Succession Architecture
Spousal inheritance of business shares is the default position when no succession architecture exists. The Growth layer introduces the mechanisms that make succession intentional: share classes that separate economic rights from voting rights, cross-option agreements, and a holding company structure that gives the founder control over how the business transfers.
The Expansion layer is the constitutional architecture that makes succession a designed outcome rather than a legal default, governance frameworks, family constitutions, and decision-making structures that determine what happens to the business and the wealth above it across generations, not just at the first transfer event.