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ACCA Strategic Professional · Advanced Taxation (UK)

Corporation Tax: Comprehensive Calculation of the Liability, Including Overseas Aspects

Corporation tax in ATX-UK means building taxable total profits from trading, property, gains and other income, deducting reliefs, then applying the right rate. Check marginal relief and associated companies, then add overseas relief and payment dates. Work in a fixed order and show every step for marks.

What this chapter covers

This chapter covers the full corporation tax computation for a UK company. You start with the rates and the small profits and main rate position, then build taxable total profits. You then deal with losses, chargeable gains, groups, overseas matters, anti-avoidance and payment.

In ATX-UK the computation is rarely tested in isolation. A Section A case study may ask you to compare group relief with carrying losses back, advise on a share sale or asset sale, or explain what happens if a company becomes non-UK resident. The chapter also links to capital gains, VAT, stamp taxes and owner-managed business planning elsewhere in the paper.

You must use the tax tables ACCA provides. They give the corporation tax rates (small profits rate 19%, main rate 25%, lower limit £50,000, upper limit £250,000, standard fraction 3/200), the marginal relief formula, the £1,500,000 profit threshold for quarterly instalments, and interest rates. Learn what is in the tables and where, so you spend exam time applying figures, not remembering them.

Corporation tax appears in almost every ATX-UK sitting, often across Section A and Section B, because companies are central to business tax advice. Each exam is out of 100 marks, with 20 professional skills marks, so you must also advise clearly, compare options and show commercial awareness. Computations earn marks for method even when a number is wrong. Candidates who know the order of the calculation and the planning points pick up marks quickly and reliably.

Corporation tax: the comprehensive calculation of the corporation tax liability, including overseas aspects: topics in the order to study them

  1. 1Corporation Tax Rates, Marginal Relief and InstalmentsStart with the rates and the marginal relief formula because every later computation ends with them.
  2. 2Computing Taxable Total ProfitsThis is the core layout that all other topics feed into, so master it second.
  3. 3Loss Relief for CompaniesLosses reduce taxable total profits, so learn them once the basic computation is secure.
  4. 4Chargeable Gains for Companies and Reinvestment ReliefGains join taxable total profits and also bring in the rules for reliefs on reinvestment.
  5. 5Groups: Group Relief, Gains Groups and Stamp TaxesGroups build on losses and gains, adding who can share them and the stamp tax consequences.
  6. 6Overseas Aspects: Residence, Double Tax Relief and BranchesOverseas rules change which profits are taxed, so study them after the domestic rules are firm.
  7. 7Transfer Pricing, CFCs and Anti-AvoidanceThese rules adjust profits in cross-border and related-party situations, so they follow the overseas topic.
  8. 8Administration, Interest and Payment of Corporation TaxFinish with filing, payment dates and interest, which apply to the finished liability.

How to prepare Corporation tax: the comprehensive calculation of the corporation tax liability, including overseas aspects

Treat this chapter as one computation with add-on rules. Build the layout first, then attach each relief and overseas rule to it.

  1. Learn the standard layout for taxable total profits and write it from memory until it is automatic.
  2. Open the tax tables and mark the corporation tax rates, marginal relief formula, instalment threshold and interest rates, so you know exactly what you are given.
  3. Practise marginal relief and associated company questions, using the formula (Upper limit – Augmented profits) × Standard fraction × Taxable total profits ÷ Augmented profits.
  4. Do loss and group questions by comparing options: which relief saves the most tax and when.
  5. Work through overseas and anti-avoidance topics with short scenario questions, writing a clear conclusion each time.
  6. Attempt full Section A style questions under timed conditions and practise the written advice for professional skills marks.
  7. Review your answers for missing steps, then repeat weak topics with new questions.

Common mistakes in Corporation tax: the comprehensive calculation of the corporation tax liability, including overseas aspects

  • Forgetting to adjust the limits for associated companies or short accounting periods.

    Fix: Check the number of associated companies and the period length before you apply any rate or marginal relief.

  • Using taxable total profits instead of augmented profits when testing the limits.

    Fix: Add exempt distributions from non-group companies to taxable total profits to get augmented profits, and use that for the limit test.

  • Choosing a loss relief without comparing alternatives.

    Fix: List the available reliefs, calculate tax saved under each, and explain your choice and its timing.

  • Giving a computation but no advice.

    Fix: Add a short, reasoned recommendation and note any assumptions, as professional skills marks depend on it.

  • Ignoring residence when overseas income or branches appear.

    Fix: State the company's residence first, then decide what is taxable and then calculate relief for foreign tax.

  • Misremembering payment dates and interest.

    Fix: Practise a short timeline for normal and large companies and use the interest rates from the tables.

Last-day revision: Corporation tax: the comprehensive calculation of the corporation tax liability, including overseas aspects

  • Small profits rate is 19% and main rate is 25% in the tables; limits are £50,000 and £250,000.
  • Marginal relief applies when augmented profits fall between the lower and upper limits.
  • Lower and upper limits are divided by the number of associated companies, and reduced for short periods.
  • Taxable total profits come from trading, property, other income and chargeable gains, less reliefs and qualifying charitable donations.
  • Choose between loss reliefs by comparing tax saved and timing.
  • Group relief needs the right group relationship and can only be claimed within the allowed period of the loss.
  • Gains groups allow tax-free transfers of assets and the option to elect which company bears a gain.
  • Overseas rules depend on company residence; give relief for foreign tax as double tax relief.
  • Quarterly instalments apply to large companies; the profit threshold in the tables is £1,500,000.
  • Interest on underpaid tax is 8.50% and on overpaid tax 3.50% in the tables.
  • Stamp duty on shares is 0.5% in the tables; check the non-residential SDLT bands there too.
  • Always end with a clear recommendation and the reason for it.

Corporation tax: the comprehensive calculation of the corporation tax liability, including overseas aspects practice questions

Corporation tax: the comprehensive calculation of the corporation tax liability, including overseas aspects in other exams

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

Corporation tax: the comprehensive calculation of the corporation tax liability, including overseas aspects: frequently asked questions

What corporation tax rates do I get in the ATX-UK exam?

The tax tables give a small profits rate of 19% and a main rate of 25%, with a lower limit of £50,000 and an upper limit of £250,000. They also give the standard fraction of 3/200 and the marginal relief formula. You still need to know when and how to use them.

How is marginal relief calculated?

Marginal relief applies when augmented profits lie between the lower and upper limits. The tables give it as (Upper limit – Augmented profits) × Standard fraction × Taxable total profits ÷ Augmented profits. Deduct it from corporation tax at the main rate.

Which corporation tax topics are most likely in Section A?

Section A case studies often mix losses, groups, gains and overseas matters with advice on a transaction. You cannot predict one topic, so practise the full computation and the planning points together.

Do I need to know the quarterly instalment rules?

Yes. The tables give a profit threshold of £1,500,000 for quarterly instalments. You should be able to say whether a company is large and when the instalments fall due, and be ready for a question on interest if payments are late.