ACCA ATX Corporation Tax: Complete Study Guide (2024/25)

Corporation tax is examined throughout ATX, most prominently in questions involving corporate groups and international structures. If you have studied TX, you will have a solid foundation in single-company computation. ATX takes that foundation and extends it significantly: how do companies within a group interact? How does HMRC tax UK companies with overseas operations? What happens when a group restructures? These are the questions ATX corporation tax is designed to test.

For a complete overview of the ATX syllabus, see the ACCA Advanced Taxation course page or the ATX study hub.

1. ATX Corporation Tax vs TX: What Is New at Strategic Professional Level

In TX, corporation tax questions focused on a single company: adjust accounting profits to arrive at tax-adjusted trading income, compute capital allowances, add chargeable gains, apply losses, and calculate the tax liability. At ATX level, those skills are a prerequisite, not the focus.

The new areas at ATX are:

• Groups — group relief (loss surrender), chargeable gains groups (no gain/no loss transfers, rollover across members, degrouping charges), and consortium relief.

• International taxation — transfer pricing, thin capitalisation, controlled foreign companies (CFCs), and overseas permanent establishments.

• Corporate reconstructions — demergers, share-for-share exchanges, and paper-for-paper treatment.

• Tax planning — advising which company should make a relief claim, comparing relief options, and structuring transactions to minimise tax.

The open-book format of the ATX exam (HMRC guidance and tax tables are provided) means marks are rarely available for reciting rules from memory. Marks are earned by applying rules correctly, identifying planning opportunities, and communicating advice clearly.

2. Corporation Tax Computation Reminder

ATX questions assume you can prepare a basic corporation tax computation without prompting. The standard structure is:

• Net profit per accounts

• Add back: disallowable expenditure (depreciation, entertaining, capital expenditure charged to P&L)

• Less: non-trading income (investment income, rental income — taxed separately)

• Less: capital allowances

• = Tax-adjusted trading profit

• Add: property business income

• Add: non-trading loan relationship income (net)

• Add: chargeable gains

• Less: qualifying charitable donations

• = Taxable total profits (TTP)

• Tax at 25% (main rate 2024/25, where profits exceed £250,000); 19% small profits rate (below £50,000); marginal relief between these thresholds

Note that the £250,000 and £50,000 thresholds are divided by the number of associated companies — a point frequently tested in ATX where groups are involved.

3. Group Relief

Group relief is the mechanism by which a loss-making group company can transfer current-year losses to a profitable group company for immediate tax relief.

Defining the Group Relief Group

A group relief group requires that the surrendering and claimant companies are both members of the same group — meaning one is a 75% subsidiary of the other, or both are 75% subsidiaries of a common parent. The 75% test applies to:

• Beneficial ownership of ordinary share capital

• Entitlement to distributable profits

• Entitlement to net assets on a winding up

All three must be satisfied at 75% or above. The relationship can be direct or indirect (traced through a chain of subsidiaries), but the indirect holding is also measured by multiplying the percentages down the chain.

Surrenderable Amounts

A company can surrender:

• Current-year trading losses

• Excess property business losses

• Excess management expenses (relevant for holding companies)

• Non-trading loan relationship deficits (net interest expense exceeding income)

The amount claimable is limited to the lower of the surrendering company's available loss and the claimant company's taxable total profits for the corresponding period. If accounting periods do not align, apportionment is required.

Consortium Relief

Where a company (the consortium company) is owned at least 75% in aggregate by a consortium of companies, each holding at least 5%, consortium relief allows losses to flow between the consortium company and each consortium member — but only in proportion to that member's ownership percentage. Consortium relief is more restrictive than group relief and is often tested in scenarios where a joint venture vehicle is involved.

4. Chargeable Gains Groups

Chargeable gains group rules are distinct from group relief rules, and the group definition is different: a chargeable gains group requires a direct or indirect 75% ordinary share capital relationship and an effective interest of more than 50% held by the principal company.

No Gain/No Loss Transfers

An asset transferred between members of the same chargeable gains group is treated as a no gain/no loss disposal — the transferee acquires the asset at the transferor's original cost (adjusted for any indexation allowance accrued to date). This allows assets to be moved around the group without triggering an immediate tax charge.

Rollover Relief Across Group Members

Rollover relief (replacement of business assets) can be claimed across members of a chargeable gains group: one group company can sell an asset and another group company can make the qualifying replacement, and the gain can still be deferred. This is a valuable planning tool and a frequent ATX exam topic.

The Degrouping Charge

When a company leaves a chargeable gains group within 6 years of receiving an asset by way of an intra-group no gain/no loss transfer, a degrouping charge arises. The departing company is treated as having sold and immediately reacquired the transferred asset at its market value on the date of the original intra-group transfer. This crystallises the gain that was deferred at the time of the transfer.

Importantly, if the company leaves the group as part of a share sale by another group company, the degrouping gain is added to the purchaser's consideration — it is treated as a gain of the vendor rather than the departing company. Understanding this distinction is key in ATX exam scenarios involving group disposals.

5. Loss Planning in Groups

ATX loss planning questions typically ask candidates to advise on the most tax-efficient use of group losses. Key considerations include:

• Rate of relief — a loss relieved against profits taxed at 25% is worth more than one relieved against profits at 19%. Where group members have different tax rates, surrender to the highest-rate company maximises the benefit.

• Timing of relief — group relief provides immediate relief in the current period. Carrying a loss forward delays relief, reducing its present value. Where time value is relevant, group relief should generally be preferred.

• Restriction on brought-forward losses — losses carried forward from periods before April 2017 can only be offset against profits of the same trade. More recent losses are more flexible (can be offset against total profits) but may be subject to the loss restriction cap (50% of profits exceeding £5m) for large companies.

• Partially overlapping periods — where accounting periods do not match, the surrenderable and claimable amounts must be time-apportioned before the claim is quantified.

6. Transfer Pricing

Transfer pricing rules require that transactions between connected companies (broadly, companies under common control, whether UK or overseas) are priced as if the parties were independent. Where non-arm's-length pricing has been used, HMRC can make a transfer pricing adjustment, substituting the arm's-length price when computing UK profits.

When Transfer Pricing Applies

The rules apply where there is a provision between connected parties that confers a potential UK tax advantage — most commonly, a loan with a below-market interest rate, an above-market management charge, or a below-market royalty rate. Both cross-border and UK-to-UK transactions can be in scope, though UK-to-UK transactions involve a compensating adjustment (so no net tax leakage within a UK group).

Thin Capitalisation

Thin capitalisation is a specific application of transfer pricing to loans. Where a UK company borrows from a connected overseas party and the level of debt is greater than an independent lender would provide, HMRC may restrict the interest deduction to that which would be allowable on the arm's-length debt amount. This is tested in ATX where a UK subsidiary is funded primarily by loans from a foreign parent rather than equity.

7. Controlled Foreign Companies (CFCs)

The CFC rules are designed to prevent UK groups from diverting UK-generated profits to low-tax overseas subsidiaries.

The Gateway Test

A UK company is potentially subject to a CFC charge if it controls an overseas company and the CFC passes the 'gateway' — broadly, if the CFC's profits represent UK profits that have been artificially diverted offshore. HMRC applies a series of tests (the profit condition, the non-UK business condition, and others) to determine whether a charge arises.

The Charge

Where a CFC charge applies, the UK controlling company includes a proportionate share of the CFC's chargeable profits in its own corporation tax computation. The charge is reduced by any foreign tax paid by the CFC on the same profits.

Exemptions

A number of exemptions can fully exclude a CFC from the charge: the excluded territories exemption (jurisdiction has an effective tax rate of at least 75% of the UK rate), the low-profit exemption, the low profit margin exemption, and the tax exemption. In ATX, identifying whether an exemption applies and advising accordingly is the typical exam task.

8. Overseas Permanent Establishments

A UK resident company with an overseas branch (permanent establishment, or PE) is taxable in the UK on its worldwide profits, including the overseas branch profits. The company can avoid double taxation by either:

• Credit relief — including PE profits in UK TTP and claiming a credit for overseas tax paid (limited to the UK tax on those profits), or

• Exemption election — electing to exempt all overseas PE profits and losses from UK corporation tax entirely.

The exemption election is irrevocable and applies to all PEs of the company (they are pooled — it is not possible to exempt only profitable PEs). The election is beneficial where the overseas PE consistently makes profits taxed at a lower effective rate than the UK rate. However, if the PE makes losses, those losses will not be available to set against UK profits if the exemption is in place.

ATX questions often present a scenario with a mix of profitable and loss-making PEs and ask candidates to evaluate whether the exemption election is beneficial.

9. Corporate Reconstructions

Share-for-Share Exchanges and Paper-for-Paper Treatment

Where a company acquires another company by issuing its own shares as consideration (a share-for-share exchange), the shareholders of the target company receive new shares rather than cash. Under paper-for-paper treatment, no CGT disposal arises at the time of the exchange — the new shares stand in the shoes of the old shares, inheriting the original base cost and acquisition date. CGT is deferred until the new shares are actually disposed of.

Paper-for-paper treatment applies automatically where the exchange is for bona fide commercial reasons and is not part of a scheme to avoid tax. Where cash is also received (a mixed consideration), the cash element is immediately chargeable to CGT.

Demergers

A demerger involves splitting a business between two or more separate companies. ATX covers two main types:

• Statutory demerger — under section 110 Insolvency Act or under the HMRC extra-statutory concession route. Qualifying statutory demergers are exempt distributions — no income tax or CGT arises on the shareholders at the time of the demerger.

• Non-statutory (three-cornered) demerger — a holding company distributes shares in a subsidiary to its own shareholders. This is treated as a capital distribution to shareholders rather than an exempt distribution, so CGT treatment applies at the shareholder level.

For a demerger to qualify for statutory treatment, conditions must be met relating to the trading nature of the businesses being separated and the purpose of the demerger.

10. Common ATX Exam Mistakes on Corporation Tax

• Confusing group relief and chargeable gains group definitions — the 75% test is similar but the detail differs; always state both the ordinary share capital test and the beneficial entitlement test for group relief.

• Missing the degrouping charge — in questions involving a group company sale, always check whether any asset was transferred intra-group within the last 6 years.

• Threshold division for associated companies — failing to divide the £250,000 and £50,000 rate thresholds by the number of associated companies is a common error in group questions.

• Not recommending which company should claim group relief — the question usually requires advice, not just computation. Consider effective tax rates when making the recommendation.

• Transfer pricing without identifying the adjustment — candidates often identify that transfer pricing applies but do not calculate or state what the arm's-length adjustment should be.

• PE exemption election — not mentioning the all-or-nothing rule — the election cannot be applied selectively to individual PEs; it applies to all of them.

• Applying the wrong treatment to a share-for-share exchange — confusing paper-for-paper deferral with the full CGT exemption available under the Substantial Shareholding Exemption (SSE), which applies where a company disposes of shares in a trading subsidiary.

For full ATX corporation tax video lectures and practice questions, visit Learnsignal's ATX study hub. Learnsignal provides comprehensive ATX video content — filling a significant gap in the market, as OpenTuition does not offer ATX lecture coverage. Explore the full ATX course to cover groups, international tax, personal tax, and IHT in one structured programme.

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