The average UK business owner thinks about succession at 60. The optimal time to start planning is 45. The difference is not sentimental: it is structural. The tax reliefs that make succession efficient require time to qualify. The governance structures that make it smooth require time to embed. The family conversations that make it sustainable require time to have.
A founder who starts at 60 is working with whatever reliefs are available now, whatever the family dynamics are now, and whatever the business value is now. A founder who started at 45 has had 15 years to shape all three.
What the cost looks like without a plan
A business worth £5m at death, held personally, is subject to IHT at 40% on the value above the nil-rate band (£325,000) and the residence nil-rate band (£175,000 where applicable). Business Property Relief (BPR) may exempt qualifying business assets, but BPR is now subject to a £2.5m cap per person (£5m for couples) from April 2026. The value above the cap is taxed at 40%.
On a £5m business with BPR capped at £2.5m, the IHT exposure is 40% of £2.5m. £1m. That is £1m that must be found from somewhere to pay HMRC within six months of death. If the business cannot be sold quickly, the family may be forced to sell assets at an unfavourable time to meet the liability.
The planning tools
Lifetime gifts. A gift of business shares to a child is potentially exempt from IHT if the donor survives seven years. The gift may trigger CGT at the point of transfer: but hold-over relief is available for gifts of business assets, deferring the CGT until the recipient disposes of the shares. A founder who gifts shares at 50 and survives to 57 has removed that value from their estate entirely.
Estate architecture. A capital structure that allows future growth to accrue outside the founder's estate while the founder retains operational control. The IHT exposure is locked at today's value from the moment the structure is installed. This is not a trust. It is a different instrument - one that addresses future growth specifically.
Family investment company. A FIC holds investment assets: property, shares, cash, and issues shares to family members at different classes. The founder retains control through voting shares. Income and capital can be distributed to family members at their respective tax rates. The FIC sits outside the founder's estate for IHT purposes once the shares have been gifted and the seven-year clock has run.
Governance structure. A family constitution or shareholders agreement sets out how decisions are made, how disputes are resolved, and what happens when a family member wants to exit. Without it, the legal default applies, and the legal default is rarely what any family member would have chosen.
The window that is closing
The April 2026 BPR cap means that business owners with assets above £2.5m (per person) have a narrowing window to restructure before the new rules apply. The structures that reduce IHT exposure - lifetime gifts, estate architecture, family capital vehicles - all require time to implement and time to qualify. The Capital Audit identifies your current succession exposure and the specific steps required to address it.
The Layer That Makes Succession Work
Succession planning at the Stability layer is a will, a shareholders agreement, and a conversation with an accountant about Business Relief. It is not wrong. It is the floor.
The Growth layer introduces the mechanisms that make succession intentional: a family investment company, the new share class, alphabet shares, and a holding structure that separates the founder's economic interest from the next generation's without triggering an immediate tax event.
The Expansion layer is the constitutional architecture that makes succession a designed outcome rather than a legal default, a family constitution, a governance framework, and a decision-making structure that determines how wealth transfers across generations, how disputes are resolved, and how the family functions as a capital-owning unit. The families who transfer wealth intact built this layer while the founder was still in control.