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Taxation (UK) · The use of exemptions and reliefs in deferring and minimising corporation tax liabilities

Substantial Shareholding Exemption (SSE) in TX-UK

Updated 11 October 2026 · Fact-checked

Substantial shareholding exemption (SSE) makes a company's gain on selling shares exempt from corporation tax. It needs a holding of at least 10% for a continuous 12 months in the six years before sale, and the investee must be a trading company or trading group holding company throughout that period until disposal. SSE is outside the TX-UK syllabus.

Understand Substantial Shareholding Exemption

Note: SSE is not in the TX-UK examinable documents, and the ACCA documents supplied do not set out the SSE conditions. Treat this page as background reading, not as a TX-UK exam topic. For the exact wording of the rules, check the legislation (TCGA 1992 Sch 7AC) or HMRC guidance.

When a company sells shares, it normally has a chargeable gain. That gain goes into taxable total profits and is taxed at the corporation tax rates. The substantial shareholding exemption (SSE) removes that charge when the company has a substantial, long-held stake in a trading business.

The idea is simple. The UK does not want to tax a company for selling a real, long-term stake in a trading company. Such a sale is closer to selling part of a business than to a quick investment trade.

There are two sets of tests. First, the holding test: the selling company must have held at least 10% of the ordinary share capital of the investee company. It must also have been entitled to at least 10% of the profits available for distribution and 10% of the assets available on a winding up. It must have held this for a continuous 12 months in the six years before the disposal.

Second, the trading test: the company whose shares are sold must be a trading company, or the holding company of a trading group or sub-group. This page tests that status from the start of the 12-month holding period until the disposal. The detailed trading conditions are outside the ACCA documents supplied, so check the legislation if you need the precise wording.

If SSE applies, the gain is exempt, and any loss is not an allowable loss. Exemption is automatic, so you do not make a claim. If a condition fails, compute the gain in the normal way and tax it at the corporation tax rate that applies to the company.

Key rules to remember

Holding test
Holding ≥ 10% of ordinary share capital (plus ≥ 10% of distributable profits and ≥ 10% of assets on winding up)
The selling company must meet all three parts, not just one.
Period test
Held continuously for 12 months within the 6 years before the disposal
The 12 months need not end on the date of sale. The detailed SSE rules are not covered in the ACCA documents supplied. Treat them as background outside TX-UK and check TCGA 1992 Sch 7AC or HMRC guidance for the exact wording.
Trading test
Investee is a trading company (or holding company of a trading group or sub-group) throughout the period from the start of the 12-month holding period until disposal
The test focuses on the investee's trading status. The detailed rules are outside the ACCA documents supplied, so check the legislation for the exact conditions.
Effect of SSE
Gain = exempt; loss = not allowable
If SSE applies, a loss cannot be set against other gains.
Corporation tax rates (if SSE fails)
Small profits rate 19%; main rate 25%; limits £50,000 to £250,000; marginal relief fraction 3/200
These are the TX-UK rates. Use them when the gain is taxable.

How to solve Substantial Shareholding Exemption questions

Use this method on any SSE problem. SSE is outside TX-UK, so this is for wider study. Test the conditions in order and stop as soon as one fails.

  1. 1Identify the selling company and the company whose shares are sold. Note the percentage held and the dates of purchase and sale.
  2. 2Check the holding level: at least 10% of ordinary share capital, and at least 10% of profits and assets where the question gives them.
  3. 3Check the period: find a continuous 12 months within the six years before the sale in which the 10% holding was in place.
  4. 4Check the trading test: was the investee a trading company, or holding company of a trading group or sub-group, throughout the period from the start of the 12 months until the sale?
  5. 5If every test is met, state that the gain is exempt. If the result is a loss, state that it is not allowable.
  6. 6If any test fails, compute the gain normally and include it in taxable total profits.
  7. 7Tax the gain at the rate that applies to the company's profits. Remember marginal relief if profits fall between the lower and upper limits.

Quickest way: Three-question SSE check

When to use it: Use this as a fast check when you meet an SSE problem in wider study. It is not tested in TX-UK.

  1. Ask: was the holding 10% or more? If not, SSE fails.
  2. Ask: was it held for 12 months continuously in the six years before sale? Count the months from the dates.
  3. Ask: was the investee a trading company, or holding company of a trading group or sub-group, throughout the period from the start of the 12 months until the sale?
  4. If all three answers are yes, the gain is exempt and any loss is not allowable. Otherwise tax the gain as normal.

Common mistakes in Substantial Shareholding Exemption

  • Applying SSE to a holding of less than 10%.

    Students see a large gain and assume the relief applies to any shareholding.

    Fix: Check the percentage first. Even 9.9% fails the test.

  • Counting less than 12 months, or counting the wrong months.

    Students mix up the purchase date and the sale date, or forget that the period is 12 months, not one year to the exact day.

    Fix: List the purchase date and sale date and count whole months. Then check that the 12 months falls within the six years before sale.

  • Testing the investee's trading status only at the date of sale.

    Students look at one date instead of the whole period.

    Fix: Test trading status from the start of the 12-month holding period until disposal. The detailed conditions are outside the ACCA documents supplied, so check TCGA 1992 Sch 7AC if you need the exact wording.

  • Allowing a loss on shares where SSE applies.

    Students think exemption only affects gains.

    Fix: Remember that SSE works both ways. If the conditions are met, the loss is not allowable.

  • Testing the seller's trading status instead of the investee's.

    Students assume both companies must be trading companies.

    Fix: Focus on the company whose shares are sold. Test whether the investee is a trading company, or the holding company of a trading group or sub-group.

  • Taxing a non-exempt gain at 19% by default.

    Students assume the small profits rate applies without looking at total profits.

    Fix: Work out the company's taxable total profits including the gain. Apply 25% above the upper limit, or use marginal relief where relevant.

Worked examples

Example 1

Alpha Ltd bought 15% of the ordinary share capital of Beta Ltd on 1 March 2021. Beta Ltd was a trading company throughout Alpha's holding. Alpha sold the whole holding on 30 April 2026 and made a gain of £120,000. Compute the corporation tax on the gain. Separately, suppose Alpha Ltd had instead made a loss of £30,000. State the treatment.

Show the solution
  1. Holding test: 15% is at least 10%, so it is met.
  2. Period test: Alpha held the shares from 1 March 2021 to 30 April 2026, which is more than 12 months continuously. The six-year window before the sale runs from 30 April 2020 to 30 April 2026. The qualifying 12-month period runs from 1 March 2021 to 28 February 2022. This falls inside the six-year window, so the period test is met.
  3. Trading test: Beta Ltd was a trading company from the start of that 12-month period on 1 March 2021 until the sale on 30 April 2026, so it is met.
  4. All conditions are met, so SSE applies and the gain of £120,000 is exempt.
  5. Corporation tax on the gain is £nil.
  6. If there had been a loss of £30,000, SSE would still apply, so the loss would not be an allowable loss.

Answer: The £120,000 gain is exempt, so the corporation tax on it is £nil. A £30,000 loss would not be allowable.

Example 2

Gamma Ltd bought 10% of the ordinary share capital of Delta Ltd, a trading company, on 1 June 2025. It sold all the shares on 30 April 2026 and made a gain of £80,000. Gamma Ltd's other taxable total profits are £400,000. Assume Gamma Ltd has no associated companies and that its augmented profits equal its taxable total profits. Compute the corporation tax on the gain.

Show the solution
  1. Holding test: 10% meets the minimum of at least 10%.
  2. Period test: 1 June 2025 to 30 April 2026 is 11 months. Gamma does not meet the continuous 12-month requirement.
  3. The holding was only acquired on 1 June 2025, so there is no earlier 12-month period. SSE therefore does not apply.
  4. The gain of £80,000 is a chargeable gain and is included in taxable total profits.
  5. Taxable total profits are £400,000 + £80,000 = £480,000. With no associated companies, the upper limit is not scaled and stays at £250,000. Augmented profits equal taxable total profits, so they are also £480,000, which is above the upper limit.
  6. The main rate of 25% applies, so no marginal relief is available.
  7. Tax on the gain = £80,000 × 25% = £20,000.

Answer: SSE fails because the shares were held for only 11 months. On the stated assumptions, corporation tax on the gain is £20,000.

Exam tips

  • SSE is not in the TX-UK examinable documents. Do not spend TX-UK revision time on it.
  • If a TX-UK question has a company selling shares, compute the chargeable gain in the normal way and include it in taxable total profits.
  • Use the corporation tax rates and marginal relief formula given in the TX-UK exam when a gain is taxable.
  • Do not confuse SSE with rollover relief. SSE is a full exemption for qualifying shareholdings, while rollover relief defers the gain on qualifying business assets.
  • If you go on to a later tax paper, check its syllabus and examinable documents to see whether SSE is examined there.

Practice questions from The use of exemptions and reliefs in deferring and minimising corporation tax liabilities

Substantial Shareholding Exemption in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Substantial Shareholding Exemption: frequently asked questions

What are the conditions for substantial shareholding exemption?

The selling company must have held at least 10% of the investee's ordinary share capital for a continuous 12 months in the six years before sale. It must also have been entitled to at least 10% of profits available for distribution and 10% of assets on a winding up. The investee must be a trading company or holding company of a trading group or sub-group throughout the period from the start of the 12 months until the sale.

Does the 12 months have to end on the date of the sale?

No. The 12 months can fall at any point within the six years before the disposal. This helps where a company has sold part of a long-held stake and the qualifying period ended earlier.

Can I claim a loss on shares if SSE applies?

No. If the conditions for SSE are met, the gain is exempt and any loss is not an allowable loss. You cannot set it against other chargeable gains.

Is SSE examined in TX-UK?

No. It does not appear in the TX-UK examinable documents. Where a company sells shares in TX-UK, compute the gain in the normal way and tax it with the company's other profits.

What happens if SSE does not apply?

The gain is calculated in the normal way and is included in taxable total profits. It is then taxed at the corporation tax rate that applies to the company, which is 19%, 25% or a marginal rate depending on profits.