Accountants for US and UK: SSE on a US-Owned UK Group Sale

An American founder whose UK holding company sells a UK trading subsidiary can often pay no UK corporation tax on the gain, because the Substantial Shareholding Exemption applies automatically. The US side is different: both companies are usually controlled foreign corporations, and the sale can trigger a taxable inclusion and heavy Form 5471 reporting for the owner.

That gap between the two systems is where experienced Accountants for US and UK earn their fee. The UK computation may show a nil liability, while the US return for the same year has to report a deemed dividend, possible Subpart F income and a full set of international information returns. This guide from Jungle Tax takes one transaction, the sale of a UK trading subsidiary by a UK holding company owned by a US citizen, and follows it through both systems. We cover the UK conditions, how the exemption is supported in the accounts and on the CT600, and what the American owner must report. It is written from a return-preparation and compliance point of view, not a deal-structuring one.

The fact pattern: one sale, two tax systems

The typical structure looks like this. A US citizen, living either in the United States or in the UK, owns all or most of a UK holding company (HoldCo). HoldCo owns 100% of a UK trading company (TradeCo) that the founder built. A buyer offers to acquire TradeCo's shares from HoldCo. The proceeds land in HoldCo, and the founder decides later whether to extract them as a dividend, by liquidation, or to leave them invested.

For HMRC, the question is whether HoldCo's gain on the TradeCo shares is a chargeable gain for corporation tax. For the IRS, the question is what the founder must include in income now, even though no cash has reached them, and which information returns are needed for each company. The answers are independent. A clean UK exemption does not reduce the US exposure, and in one important respect it makes the US position worse.

What is the Substantial Shareholding Exemption?

The Substantial Shareholding Exemption (SSE) is in Schedule 7AC to the Taxation of Chargeable Gains Act 1992. It was introduced by Finance Act 2002 and significantly relaxed by Finance Act 2017. When its conditions are met, a gain a company makes on disposing of shares is not a chargeable gain, and a loss is not an allowable loss. HMRC's own guidance sits in the Capital Gains Manual from CG53015 onwards, and the structure of the three exemptions is set out at CG53150.

Three points matter most to an American owner:

• It applies only to companies. An individual selling shares directly gets no benefit from SSE. It helps our founder only because HoldCo, not the founder, is the seller.
• It is automatic. There is no claim, election or form. If the conditions are met, the exemption applies, and it cannot be switched off to use a loss.
• There is no reinvestment condition. HoldCo can keep the proceeds, invest them or distribute them. The exemption does not depend on what happens to the money.

Condition 1: the substantial shareholding

HoldCo must hold a substantial shareholding in TradeCo, meaning at least 10% of the ordinary share capital, with beneficial entitlement to at least 10% of the profits available for distribution and 10% of the assets available on a winding up. It must have held that interest throughout a continuous period of at least 12 months beginning not more than six years before the disposal. The six-year window was introduced in 2017, replacing the earlier two-year window. HoldCo does not need to hold 10% at the moment of sale, which gives flexibility where a stake is sold in tranches.

Group holdings are aggregated, so shares held by other members of a UK capital gains group count towards the 10%. Where TradeCo was newly incorporated and took over assets already used in the group's trade, special rules can treat HoldCo as having held the shares for longer. The 2023 tribunal decision in M Group Holdings showed the limits here: a business carried on by a company before it joined the group could not be "looked through" to satisfy the holding period. Where a restructuring took place shortly before the sale, the holding-period analysis should be documented, not assumed.

Condition 2: the investee company must be trading

TradeCo must be a trading company, or the holding company of a trading group or trading subgroup, throughout the qualifying 12-month period. Since 2017, the requirement to be trading immediately after the disposal applies only where the buyer is connected with the seller. "Trading" means not having activities that include, to a substantial extent, activities other than trading. HMRC treats "substantial" as more than about 20%, measured by indicators such as turnover, assets, expenses and management time. Material cash balances, investment property or loans that are not needed for the trade are the usual problems. A founder-led business that has built up surplus cash in TradeCo should have that position reviewed before, not after, completion.

When does the investor (HoldCo) condition still matter?

Before 1 April 2017 the investing company also had to be a trading company or a member of a trading group. That condition has largely been repealed. It still matters in two situations. First, for the qualifying institutional investor rules, which extend relief where institutional investors own at least 25% of the seller. Second, for disposals from before 2017 being reviewed in a catch-up. For the typical founder-owned HoldCo today, HoldCo's own activities (holding cash, property or a portfolio) do not prevent the exemption, provided TradeCo meets the investee condition.

The subsidiary exemptions

Two secondary exemptions round out the regime. The first covers assets related to shares, such as options over shares that would themselves qualify. The second covers a disposal where the conditions are not all met at the time of sale but were met at some point in the previous two years, which helps where TradeCo stopped trading shortly before a sale. Neither applies automatically to every deferred-consideration right, so earn-outs need separate analysis.

Anti-avoidance

Paragraph 5 of Schedule 7AC denies the exemption where arrangements have, as a main purpose, securing an exempt gain that reflects an untaxed gain or untaxed profits moved into the company being sold. HMRC's commentary at CG53185 shows it aims at contrived arrangements, not ordinary commercial sales of a business built up over time. The general anti-abuse rule and the transactions in securities rules can also apply to later extraction of cash, which is a separate question from the exemption itself.

Degrouping charges

If TradeCo leaves the HoldCo group holding assets it received from another group member within the previous six years on a no-gain, no-loss basis, a degrouping charge may arise. Since 2011, a chargeable-gains degrouping charge is added to HoldCo's disposal consideration and so is covered by SSE where the share sale qualifies. Since 2019, the equivalent intangible-assets degrouping charge generally does not arise where the share sale qualifies for SSE. These interactions should be confirmed in the corporation tax computation, not left to inference.

How is SSE reported on the CT600 and in the accounts?

This is a question our clients often ask, because nothing on the return says "SSE claimed." In practice:

• Accounts. Under FRS 102, HoldCo's individual accounts show the profit on disposal of its investment in TradeCo. Any group accounts show the gain or loss on disposal of the subsidiary. The tax note reconciles the expected charge to the actual charge, with the exempt gain as a reconciling item.
• Computation. The corporation tax computation removes the accounting profit as not taxable and records no chargeable gain. A well-prepared computation includes a short note setting out how the shareholding, holding-period and trading conditions were met.
• CT600. Because the gain is not a chargeable gain, it does not appear in the chargeable gains figure. There is no box for SSE and no claim to make.
• Supporting file. Keep share registers, board minutes, an analysis of TradeCo's non-trading activities over the qualifying period, and the completion documents. HMRC normally has a year from the filing date to open an enquiry, and longer for discovery assessments. The burden of showing the exemption applies effectively falls on HoldCo.

What happens if SSE does not apply?

If any condition fails, HoldCo's gain is taxed as a chargeable gain at its corporation tax rate. That is 25% at the main rate for profits above £250,000, with marginal relief between £50,000 and £250,000, and the gain can push HoldCo into the main rate. Indexation allowance for companies was frozen at December 2017, so only indexation up to that date reduces the gain on older holdings. A loss on a failed-SSE disposal is an allowable capital loss. If the loss is on a qualifying disposal, it is simply ignored. Where a sale is expected to produce a loss, owners are sometimes surprised to learn the exemption cannot be disapplied.

The US side: why HoldCo and TradeCo are CFCs

A foreign corporation is a controlled foreign corporation (CFC) when US shareholders, meaning US persons each owning at least 10% by vote or value, together own more than 50%. A US founder who owns HoldCo outright makes HoldCo a CFC. Because HoldCo owns TradeCo, the founder indirectly owns TradeCo, which is therefore a lower-tier CFC. Each year, the founder already has to consider income from both companies under the Subpart F rules and the net CFC tested income (NCTI) regime. NCTI is the name the One Big Beautiful Bill Act of 2025 gave to what was formerly GILTI, for CFC tax years beginning after 31 December 2025. The founder must also file a Form 5471 for each company. Many owners of UK groups have been filing this correctly for years. Many others have not, which we return to below.

Section 964(e): the sale of a lower-tier CFC as a dividend

When one CFC sells stock in another foreign corporation, section 964(e)(1) treats the gain as a dividend to the extent it would have been a dividend under section 1248 if the seller were a US person. In broad terms, that means up to the target's earnings and profits (E&P) built up while HoldCo held it, excluding E&P already taxed in the US (previously taxed earnings and profits, or PTEP). For TradeCo, that is its retained profits that were not already taxed to the founder under Subpart F or NCTI. Where the founder made the GILTI high-tax exclusion election in earlier years, which is common for a UK company paying corporation tax at 25%, much of TradeCo's E&P may never have been taxed in the US. That untaxed E&P is exactly what section 964(e) captures on a sale.

Under section 964(e)(4), the foreign-source portion of that deemed dividend is treated as Subpart F income of the selling CFC, HoldCo. It is then included by the US shareholder under section 951(a). For a US corporate shareholder, section 964(e)(4) allows a section 245A participation-exemption deduction that largely offsets the inclusion. This is the provision most US commentary focuses on. It does not help our founder. Section 245A is available only to domestic C corporations, so an individual US shareholder includes the recharacterised amount as ordinary income without an offsetting deduction. The recent legislative changes kept this architecture intact, although the renaming to NCTI, the 40% section 250 deduction and the 90% deemed-paid credit change the surrounding calculations for corporate owners.

The rest of the gain: Subpart F foreign personal holding company income

Any gain above the section 964(e) dividend amount stays as gain in HoldCo's hands. Gain from selling stock is generally foreign personal holding company income under section 954(c)(1)(B), a category of Subpart F income, because shares are property that gives rise to dividends. The founder must include their pro rata share in the year of the sale, whether or not HoldCo distributes anything.

This is where SSE works against the owner. The Subpart F high-tax exception generally lets income be excluded where the foreign effective tax rate exceeds 90% of the top US corporate rate, which is 18.9% at today's 21% rate. A UK company paying 25% on ordinary trading profits usually clears that threshold. Gain exempt under SSE, however, bears 0% UK tax, so the high-tax exception cannot shelter it. The UK exemption therefore removes the very foreign tax that would have made the income high-taxed for US purposes, and no UK tax credit is available to offset the US inclusion.

Timing and pro rata share

The inclusion arises in the founder's tax year in which HoldCo's US tax year ends. HoldCo's US tax year may differ from its UK accounting period. The required-year rules and the repeal of the old one-month deferral election mean the US calculation often has to be rebuilt on a different basis from the UK statutory accounts. For CFC tax years beginning after 2025, pro rata share rules also look at ownership on any day of the year, not only the last day. That matters where the founder's shareholding changed around the time of the sale.

The section 962 election

An individual US shareholder can elect under section 962 to be taxed on Subpart F and NCTI inclusions as if they were a domestic corporation. The inclusion is then taxed at the 21% corporate rate rather than at ordinary individual rates of up to 37%. The election is made year by year on a timely filed return, including extensions. When cash later comes out of HoldCo, a distribution of the electing year's PTEP is taxable to the extent it exceeds the US tax paid under the election. If HoldCo is a qualified foreign corporation under the US-UK treaty, that distribution may qualify for the preferential dividend rate.

Because the SSE-exempt gain carries no UK tax, the 962 election gives no foreign tax credit benefit on this particular inclusion. Its value is purely the rate difference and the deferral of the second layer of tax. Whether a 962 electing individual can also claim the section 245A deduction on the section 964(e) amount is not something to assume; we treat it as unavailable unless specific support exists. The election has to be modelled against the founder's plans for the cash. A founder who plans to liquidate HoldCo quickly may find the two-layer cost close to the single-layer ordinary-rate cost.

Net investment income tax and state tax

Subpart F inclusions are generally not net investment income when included, unless the owner has made the relevant election under the regulations. Later distributions of that PTEP generally are. State treatment varies, and some states do not follow the federal treatment of inclusions. A founder resident in a high-tax state should have both layers modelled.

If the founder lives in the UK

A US citizen who is UK resident faces a timing mismatch. The US may tax the inclusion in the year of the sale, while the UK taxes the founder only when HoldCo pays a dividend or distributes on a liquidation, possibly years later. The US tax paid on the earlier inclusion does not automatically create a UK credit against the later UK dividend tax. Under the four-year foreign income and gains regime that replaced the remittance basis from April 2025, the position depends on the founder's arrival date. The extraction route needs careful sequencing across both returns. Our US-UK tax accountants prepare both sides together so that credits are matched rather than lost.

UK vs US: the same sale in two tax systems

Issue	UK (HoldCo, HMRC)	US (American owner, IRS)
Who is taxed	HoldCo, as the seller of TradeCo shares	The US shareholder, through Subpart F inclusions from HoldCo
Headline outcome if conditions are met	Gain is not a chargeable gain under SSE	Gain recharacterised as a dividend under s.964(e) up to untaxed E&P; excess is generally Subpart F income
Key conditions	10% holding for 12 continuous months in the previous six years; TradeCo trading	CFC status; 10% US shareholder; E&P and PTEP history of TradeCo
Participation exemption	Automatic, no reinvestment requirement	s.245A deduction for domestic corporations only; not for individuals
Losses	Loss on a qualifying disposal is not allowable	Loss may reduce Subpart F income in the relevant category, subject to limits
Rate if taxed	Corporation tax up to 25% if SSE fails	Ordinary rates up to 37%, or 21% under a s.962 election, plus possible later layers
Foreign tax credit	Not relevant for a UK-UK sale	Nil UK tax on an SSE-exempt gain, so no credit and no high-tax exception
Claim or election	None; the position must be supportable	s.962 election made annually on a timely return
Reporting	Accounts, computation and CT600; no SSE box	Form 5471 for HoldCo and TradeCo, Form 8992 where relevant, Form 1040 inclusion

Form 5471 reporting in the year of sale

In the year TradeCo is sold, the founder typically files a Form 5471 for HoldCo and a Form 5471 for TradeCo, usually as a category 4 and category 5 filer for each. The schedules that do the most work are:

• Schedule C and Schedule F for each company's income statement and balance sheet, translated from UK GAAP into US GAAP-based figures.
• Schedule H for current-year E&P, and Schedule J for accumulated E&P by category. TradeCo's E&P history is what sets the section 964(e) dividend, so this is usually the hardest part of the file to rebuild.
• Schedule I for the founder's Subpart F inclusion from HoldCo, including the section 964(e) amount and any foreign personal holding company income gain, and Schedule I-1 for tested income or loss.
• Schedule P for PTEP, which will be critical when HoldCo later distributes the proceeds, and Schedule Q for CFC income by category.
• Schedule O, which reports organisations, reorganisations and acquisitions or dispositions of stock. Where the founder's indirect interest in TradeCo ends because of the sale, the disposition should be considered for Schedule O reporting under the current instructions.
• Schedule M for transactions between each CFC and its US shareholder, and Schedule R for any distributions paid in the year.

Where NCTI is in play, Form 8992 is also needed, and a section 962 election brings Form 8993 into the calculation. The December 2025 revision of Form 5471 added more detail on classes of stock and ownership changes. Our US tax services team can reconcile prior years to the current form.

A worked outline

Take a simplified example. HoldCo has owned 100% of TradeCo for eight years and sells it for £20 million. HoldCo's base cost in TradeCo is £1 million. TradeCo is a genuine trading company throughout, and its retained E&P never taxed in the US (because the high-tax exclusion was elected each year) is the equivalent of £6 million.

1. UK: £19 million gain. SSE conditions met. No chargeable gain and no corporation tax. The accounts show a profit on disposal, which is reversed in the computation.
2. US, s.964(e): the equivalent of £6 million is treated as a dividend and, under s.964(e)(4), as Subpart F income of HoldCo. The individual founder has no s.245A deduction.
3. US, remaining gain: the equivalent of £13 million is generally foreign personal holding company income. The UK tax on it is nil, so the high-tax exception is unavailable.
4. Result: a potential US inclusion of about £19 million in US dollar terms in the year of sale, taxed at ordinary rates or at 21% under a s.962 election. It creates PTEP that can later be distributed without a second inclusion, subject to the s.962 rules and currency gain or loss.

The real figures depend on basis in US terms, functional-currency translation, the E&P and PTEP history, and whether any prior-year elections were made. This example only shows how a nil UK liability can sit alongside a large US one.

What if Form 5471s were never filed?

A sale is often the moment an owner realises that nobody ever filed Form 5471 for HoldCo or TradeCo. The exposure is significant. The standard penalty is $10,000 per form, per year, with continuation penalties of up to $50,000 more after IRS notice. The assessment period for the whole return generally stays open until the missing information is provided. The IRS now assesses these penalties routinely. A catch-up needs to be completed before the year-of-sale return, because the E&P and PTEP figures the sale depends on come from the prior-year filings.

• Non-wilful owners with unreported income: where prior inclusions were missed, the IRS streamlined filing procedures may be available. For a founder living in the UK this is often the Streamlined Foreign Offshore Procedure, which covers three years of amended returns, including Forms 5471, and six years of FBARs.
• No unreported income: where every year's inclusions were nil, for example because the high-tax exclusion would have applied, late forms can be filed with a reasonable-cause statement through the delinquent international information return procedures.
• Elections: elections that were never made in earlier years, such as the high-tax exclusion, need specialist analysis. Late or amended elections are subject to strict rules and should not be assumed.
• Connected filings: missed FBARs and Form 8938 reporting on HoldCo's bank and investment accounts are often part of the same catch-up. Our FBAR penalty calculator gives an initial view of that exposure.

The order matters: rebuild E&P, correct the prior-year returns, then prepare the year of sale on a reliable base.

A preparation checklist for the year of sale

• Confirm SSE: the 10% holding and 12-month period within six years, the trading status of TradeCo and its subgroup, and any degrouping charges.
• Prepare HoldCo's accounts and computation with a written SSE note, and file the CT600 on time.
• Rebuild TradeCo's E&P and PTEP in US terms, and confirm the founder's indirect basis in functional currency.
• Compute the section 964(e) dividend and the remaining foreign personal holding company income, and test any exceptions.
• Decide on the section 962 election, and model the later extraction of the proceeds from HoldCo.
• Prepare Forms 5471 for both companies, and Forms 8992 and 8993 where relevant, alongside the Form 1040. Coordinate the UK personal return if the founder is UK resident.

For owners with wider portfolios, our high-net-worth team integrates this with the rest of the family's US and UK filings.

Speak to specialists in both systems

A UK subsidiary sale that is exempt from corporation tax can still be one of the most complex US returns an American founder will ever file. Jungle Tax prepares the UK corporation tax position and the US inclusions, elections and Forms 5471 together, and brings unfiled years up to date before the sale year is reported. If your UK group has been sold, or is about to be, contact our cross-border team for a confidential consultation.