Who this is for: For founders who own a trading company personally and are considering a sale, MBO, or restructure in the next one to five years.
Business Asset Disposal Relief reduces CGT to 10%. Substantial Shareholding Exemption eliminates it entirely. On a £10m exit, the difference between the two is £1m. On a £20m exit, it is £2m.
SSE applies when a company sells shares in another company, provided the selling company has held at least 10% of the ordinary shares in the target company for a continuous period of 12 months in the six years before disposal, and the selling company is a trading company or a member of a trading group.
Why founders miss it
SSE does not apply to individuals selling shares. It applies to companies selling shares. This means the structure must be in place (a holding company must own the trading company shares) before the 12-month qualifying period begins.
A founder who decides to sell and then introduces a holding company to facilitate the sale does not get SSE. The 12-month clock has not run. They pay CGT at 20% on the full gain.
A founder who introduced a holding company 18 months ago, for entirely unrelated reasons, perhaps to hold investment assets or to facilitate a future management buyout, may qualify for SSE on the full gain. Zero CGT.
The situation
Consider two founders with identical businesses, identical exit values of £8m, identical gain of £6m after base cost.
Founder A sold personally. CGT at 20%: £1.2m payable.
Founder B had a holding company in place for 14 months before sale. SSE applied. CGT: £0.
The difference is £1.2m. The holding company cost less than £2,000 to establish. The 14-month wait was not a wait, it was the period during which the holding company was being used for other legitimate purposes.
The interaction with BADR
SSE and BADR are mutually exclusive at the company level. A company claiming SSE does not pay CGT. An individual claiming BADR pays 10%. The choice of which relief to use depends on the structure and the exit route.
For founders with businesses worth more than £10m, SSE via a holding company is almost always more valuable than BADR, because BADR is capped at £1m of qualifying gains.
The 12-month clock starts from installation, not from the decision to sell. Every month the structure is not in place is a month that cannot be recovered.
| Exit gain | CGT (no structure) | CGT (BADR) | CGT (SSE) |
|---|---|---|---|
| £3m | £600,000 | £300,000 | £0 |
| £8m | £1,600,000 | £1,500,000* | £0 |
| £15m | £3,000,000 | £2,900,000* | £0 |
*BADR capped at £1m lifetime gains; remainder at 20%.
The Window Is Open Now
The qualifying windows described in this article are not flexible. The structure has to be in place before the event that triggers the tax. The Capital Architecture maps the exact sequence and timing for your situation, so you know what needs to happen and in what order.
The audit is free and takes five minutes. The Capital Architecture is delivered within 48 hours of your intake call.
SSE Is an Architecture Question, Not a Timing Question
The SSE qualifying period is a Growth-layer requirement. The holding company must have held the shares for twelve months. That clock cannot be started retrospectively. It starts the day the holding company is incorporated and the shares are transferred.
The Expansion layer is the constitutional architecture that ensures the holding company was properly constituted, that the share transfer was correctly documented, and that the SSE eligibility is maintained through the qualifying period without inadvertent disqualification. The founders who exit tax-free built the right structure when there was no transaction in sight. The ones who miss the qualifying period built the right business but installed the holding company too late.