Key facts
- SSE exempts 100% of the chargeable gain on a qualifying disposal of shares.
- The disposing company must have held a 10% or greater shareholding for at least 12 continuous months in the 6 years before disposal.
- Both the disposing company and the company whose shares are sold must generally be trading companies (or members of trading groups).
- An institutional investor exemption can apply even if the investing company is not trading.
- SSE also exempts associated losses — meaning no relief is available if the disposal is at a loss.
How the SSE Makes Share Sales Tax-Free
The Substantial Shareholding Exemption (SSE) was introduced in 2002 to make the UK an attractive location for holding companies. When a company sells shares in a subsidiary and SSE applies, the resulting gain is completely exempt from Corporation Tax.[1]
Without SSE, a parent company selling shares in a subsidiary for (say) a £5 million gain would face a Corporation Tax bill of up to £1.25 million at 25%. SSE eliminates this charge entirely. Where the exemption applies, the gain is simply excluded from the chargeable gains reported on the company’s CT600.
Conditions for SSE
Three conditions must be met for the exemption to apply:[1][2]
1. The Shareholding Condition
The disposing company must have held a substantial shareholding in the company whose shares are being sold. A shareholding is substantial if it represents 10% or more of the ordinary share capital.
The 10% holding must have been held continuously for at least 12 months within the 6-year period ending on the date of disposal.
2. The Disposing Company Condition
The disposing company must be a trading company or a member of a trading group (or a qualifying institutional investor — see below). This is tested at the time of disposal.
3. The Target Company Condition
The company whose shares are sold (the “investee”) must be a trading company or the holding company of a trading group. This is tested:
- At the time of the disposal, and
- Immediately after the disposal (or at the beginning of the disposal if the shares are sold in stages)
“Trading” requirement: A company is “trading” if its activities do not include to a substantial extent non-trading activities. HMRC generally treats activities as substantial if they represent more than about 20% of the company’s total activity (measured by assets, income, expenses, and management time).[1]
The Institutional Investor Exemption
Since 2017, SSE has been extended so that qualifying institutional investors can benefit even when the disposing company is not itself a trading company.[4]
This was designed primarily for private equity and sovereign wealth funds. Qualifying institutional investors include:
- Companies wholly owned by sovereign wealth funds
- Companies wholly owned by qualifying pension schemes
- Companies wholly owned by life insurance companies (in respect of their BLAGAB business)
- Certain listed companies with no single controlling shareholder
Where the institutional investor exemption applies, only the target company must meet the trading condition — the disposing company does not need to be a trading company or member of a trading group.
What SSE Does Not Cover
SSE exempts gains but also prevents losses from being allowable. If you sell shares at a loss and SSE applies, you cannot claim capital loss relief.[2]
Other points to note:
| Situation | SSE Available? |
|---|---|
| Disposal of shares in a trading subsidiary (10%+ held for 12+ months) | Yes |
| Disposal of shares in an investment company | No — target must be trading |
| Disposal by an investment company (not an institutional investor) | No — disposing company must be trading |
| Shareholding below 10% | No — shareholding not substantial |
| 10% held for only 6 months before disposal | No — 12-month holding period not met |
| Disposal at a loss | SSE applies, so loss is not allowable |
Tip: Before disposing of shares at a loss, consider whether SSE would deny the loss. If so, it may be more tax-efficient to arrange the disposal so that SSE does not apply (for example, by reducing the holding below 10% in advance, though anti-avoidance rules may apply).
Frequently Asked Questions
What is the Substantial Shareholding Exemption?
SSE completely exempts a company from Corporation Tax on gains arising from the sale of shares in a subsidiary, provided the disposing company held 10% or more of the shares for at least 12 continuous months.
What are the conditions for SSE?
Three conditions must be met: the disposing company must hold a 10%+ shareholding for at least 12 months, the disposing company must be a trading company (or qualifying institutional investor), and the target company must also be a trading company.
Does SSE apply to losses as well as gains?
Yes — SSE exempts both gains and losses. If you dispose of shares at a loss and SSE applies, the loss is not allowable for Corporation Tax purposes.
Can an investment company claim SSE?
Generally no — the disposing company must be a trading company or member of a trading group. However, since 2017, qualifying institutional investors (such as sovereign wealth funds and pension schemes) can benefit even if they are not trading.
Further Reading
- Chargeable Gains for Companies — how companies calculate capital gains and losses
- Capital Gains Group Relief — no gain/no loss transfers and degrouping charges
- Group Relief — surrendering trading losses within a group
- Members’ Voluntary Liquidation — winding up a subsidiary company
- Striking Off & Dissolution — closing a subsidiary informally
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