Advanced Taxation (UK) · Corporation tax: the comprehensive calculation of the corporation tax liability, including overseas aspects

Overseas Aspects of Corporation Tax: Residence, Double Tax Relief and Branches

Updated 11 October 2026 · Fact-checked

A UK-resident company pays corporation tax on worldwide profits. Residence depends on incorporation in the UK or central management and control. Double tax relief gives a credit for overseas tax, limited to the lower of overseas tax and UK tax on that income. Branch profits can be exempt if you elect.

Understand Overseas Aspects: Residence, Double Tax Relief and Branches

A company's residence decides how much of its income the UK taxes. A UK-resident company is taxed on its worldwide profits. A non-UK resident company is taxed only on UK-source profits, such as trading through a UK permanent establishment, UK property income and some UK gains.

A company is UK resident if it is incorporated in the UK. A company incorporated abroad is still UK resident if its central management and control is exercised in the UK. This is usually where the board makes the key strategic decisions. Look at where the directors actually meet and decide, not where the paperwork says they do. Where a treaty tie-breaker applies, the treaty may treat the company as resident in the other country only. Apply it only if the question gives treaty facts.

A branch (permanent establishment) is part of the same company. A subsidiary is a separate company. A UK company with an overseas branch is taxed on the branch profits as part of its own profits, and branch losses can normally be set against UK profits. A UK company can elect for the exemption for foreign branch profits. If it does, branch profits are exempt but branch losses are not relievable. The election is irrevocable and covers all overseas branches. Do not state more detail than the question supports. An overseas subsidiary is taxed in its own country. The UK parent is taxed only when it receives dividends, and these are usually exempt.

Where the same income is taxed abroad and in the UK, double tax relief (DTR) prevents double charge. Treaty relief applies if there is a double tax treaty. Otherwise unilateral relief applies. Both work as a credit. The credit is the lower of the overseas tax suffered and the UK corporation tax on that overseas income. Any excess overseas tax is wasted. Overseas tax may be a withholding tax deducted at source from interest, royalties or dividends. The gross income is taxed in the UK and the withholding tax is the overseas tax for credit purposes.

Key rules to remember

Company residence: UK resident if incorporated in the UK, or if central management and control is in the UK; Check both tests. A foreign-incorporated company can still be UK resident.
DTR credit: Credit = lower of (overseas tax suffered) and (UK corporation tax on the overseas income); Excess overseas tax is not refunded and is not carried forward, in the usual exam treatment.
UK tax on overseas income: UK tax on overseas income = gross overseas income × UK corporation tax rate applying to the company; Use the gross figure before withholding tax. Use 19%, 25% or the marginal rate as the facts require.
Corporation tax rates (FY2023 to FY2025): Small profits rate 19% up to £50,000; main rate 25% above £250,000; marginal relief between; Marginal relief = (£250,000 − augmented profits) × 3/200 × taxable total profits ÷ augmented profits. Limits are shared among associated companies.
Net amount received after withholding tax: Gross income − withholding tax = cash received; The UK taxes the gross amount. Gross up cash received if only the net figure is given.

How to solve Overseas Aspects: Residence, Double Tax Relief and Branches questions

Use this order for any overseas aspects question. It keeps the marks for residence, treatment and computation separate.

1Decide residence. Check UK incorporation first, then where central management and control is exercised. Note any treaty tie-breaker in the facts.
2Identify the structure: branch, subsidiary or direct income with withholding tax. Each is taxed differently.
3State what the UK taxes. A UK-resident company is taxed on worldwide profits. A non-resident company is taxed only on UK-source profits.
4For a branch, decide whether the exemption election is better. Compare relief for losses now with exempt profits later.
5For each source of overseas income, work out the gross income, the overseas tax and the UK tax on it.
6Calculate the DTR as the lower of overseas tax and UK tax. Repeat for each source separately.
7Deduct DTR from the UK corporation tax liability. Do not reduce taxable profits.
8Write a brief conclusion or recommendation. Link it to the client's facts to earn professional skills marks.

Quickest way: Source-by-source DTR table

When to use it: Use this when a question gives several overseas income streams and asks for the corporation tax payable.

Set up columns: gross income, overseas tax, UK tax, DTR.
Fill the UK tax column using the rate for the company, not a guess.
Enter the lower of overseas and UK tax as DTR in each row.
Total the UK tax on all profits, then subtract total DTR.
Add one line saying any excess overseas tax is lost.

Common mistakes in Overseas Aspects: Residence, Double Tax Relief and Branches

Treating a foreign-incorporated company as non-resident without checking where it is managed.
Students stop after the incorporation test.
Fix: Always test central management and control as a second step and name where the board decides.
Using net income received instead of gross income in the UK computation.
The question gives cash received after withholding tax.
Fix: Gross up by adding back the withholding tax. Tax the gross amount and treat the withholding tax as overseas tax.
Giving DTR as the overseas tax even where it exceeds UK tax on that income.
Students forget the cap.
Fix: Write both figures and circle the lower. The credit can never exceed the UK tax on that income.
Deducting DTR from profits rather than from the tax liability.
Confusion with deduction relief for overseas tax.
Fix: Credit is taken off the corporation tax figure after it is computed.
Offering the branch exemption election without mentioning its drawbacks.
Students see 'exempt' and stop.
Fix: State that the election is irrevocable, covers all branches and removes relief for branch losses.
Blending all overseas income into one DTR computation.
It looks quicker.
Fix: Compute DTR source by source. Excess tax on one source cannot cover a shortfall on another.

Worked examples

Example 1

Alpha Ltd is UK resident with augmented profits of £400,000, taxed at the 25% main rate. Its taxable total profits of £400,000 include overseas trading income of £60,000 from Country X, on which 30% overseas tax of £18,000 was paid. Calculate the corporation tax payable after double tax relief.

Show the solution

UK tax on all profits = £400,000 × 25% = £100,000.
UK tax on overseas income = £60,000 × 25% = £15,000.
Overseas tax suffered = £18,000.
DTR is the lower of £18,000 and £15,000 = £15,000.
Corporation tax payable = £100,000 − £15,000 = £85,000.
The excess overseas tax of £3,000 is not relievable.

Answer: Corporation tax payable is £85,000. DTR is £15,000 and £3,000 of overseas tax is wasted.

Example 2

Beta Ltd is UK resident, with taxable total profits of £300,000 for a 12-month period and no associated companies. These include gross overseas interest of £40,000 received from Country Y after 10% withholding tax. It also includes gross royalties of £20,000 from Country Z after 25% withholding tax. Calculate the DTR for each source.

Show the solution

Taxable total profits are £300,000, above the £250,000 upper limit, so the main rate of 25% applies.
Interest: UK tax = £40,000 × 25% = £10,000. Withholding tax = £40,000 × 10% = £4,000. DTR = lower of £4,000 and £10,000 = £4,000.
Royalties: UK tax = £20,000 × 25% = £5,000. Withholding tax = £20,000 × 25% = £5,000. DTR = £5,000.
Total DTR = £4,000 + £5,000 = £9,000.
Cash received was £36,000 on the interest and £15,000 on the royalties, but the UK taxes the gross figures.

Answer: DTR is £4,000 on the interest and £5,000 on the royalties, a total of £9,000.

Exam tips

Show the residence tests as two separate lines. Markers award a mark for each test.
Lay out DTR in a table. A clear layout lets markers follow your figures and award marks even if one number is wrong.
In branch versus subsidiary questions, give a reasoned recommendation, not a list of facts. This is where professional skills marks are earned.
Check whether the question gives gross or net income. Many marks are lost on this alone.
Use only the rates in the tax tables provided. Check the limits if the company has associated companies or a short period.

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

Overseas Aspects: Residence, Double Tax Relief and Branches in other exams

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

Overseas Aspects: Residence, Double Tax Relief and Branches: frequently asked questions

How do I decide if a company is UK resident?

A company incorporated in the UK is UK resident. A foreign-incorporated company is UK resident if its central management and control is exercised in the UK. Look at where the directors actually take strategic decisions.

How is unilateral double tax relief calculated?

Take the lower of the overseas tax suffered and the UK corporation tax on the same overseas income. Deduct that credit from the UK corporation tax liability. Do this separately for each source.

Should a company elect for the foreign branch profits exemption?

It depends on the facts. Exemption helps where the branch is profitable and taxed at a lower rate abroad. It is a poor choice if early branch losses are expected, because relief for losses is lost. The election is irrevocable.

What happens to withholding tax suffered on overseas income?

The UK taxes the gross income. The withholding tax is the overseas tax available for credit, limited to the UK tax on that income.