Credit Method: The UK normally grants a foreign tax credit to a UK taxpayer (individual or company) for foreign tax actually paid on income that is also taxed in the UK. In practice this is governed by TIOPA 2010 Ch.2 for individuals (and income gains) and by FA98 Sch.18/CTA 2009 Ch.10 for companies. Essentially, UK tax on the foreign income is computed, and then reduced by the foreign tax paid (but not below zero). Critically, the foreign tax must be admissible for credit and must have been actually paid. The credit is capped at the UK tax attributable to that income. (In other words, you cannot use excess foreign tax to create a UK refund.)
The credit allowed is the lower of (a) foreign tax actually paid (or allowed under a DTA) and (b) the UK tax due on that income. TIOPA 2010 s.25 further provides that if a treaty could have given relief for a foreign tax, then unilateral relief under s.18 is barred in that case.

Exemption Method: Under domestic UK law, outright exemption of foreign income is limited. For individuals, there is generally no pure exemption method (except in special cases like “overseas workday relief” or some pension incomes). For companies, modern law allows exemption of most foreign dividends: under CTA 2009 s.931A (introduced FA 2009), a UK company pays UK tax on all distributions only, but then Part 9A provides extensive exemptions for dividends from foreign companies.
As a result, “most foreign dividends received by a UK company will be exempt from corporate tax”. In such cases where UK tax is zero, no foreign tax credit can be claimed (the foreign tax remains simply unrecoverable). In summary, exemption under UK law is effectively limited to specific statutory exemptions (e.g. foreign dividends under CTA 9A) or treaty provisions; otherwise, foreign income is generally taxed and relieved by credit.

Unilateral Relief: If no DTA applies, the UK will still often give relief by way of a unilateral tax credit. TIOPA 2010 s.18 allows a UK resident to claim relief (as a credit against UK tax) for foreign tax paid to a country with no treaty. The credit is calculated as if a treaty existed (so effectively up to the amount that a hypothetical treaty would allow).
Conditions apply: the taxpayer must be UK resident (s.26), the foreign tax must be paid and chargeable, and the claim cannot duplicate relief already provided (s.25 above) or be voluntarily declined (s.27). HMRC emphasises that unilateral credit relief “can only be given by way of credit for foreign tax payable under the law of the relevant country” and is limited in amount to what a treaty would allow. In short, the unilateral regime is essentially a backstop version of the credit method when a treaty is absent.

Residence and Tie-breakers: A treaty defines “residence” (usually meaning taxed on worldwide income) in Article 4. If an individual or company is resident in both countries, treaties typically include “tie-breaker” rules (for individuals: permanent home, centre of vital interests, habitual abode, nationality, mutual agreement) to determine which country is the residence for the treaty.
For companies, residence is often by place of incorporation or management. (Recent cases have applied these rules strictly – e.g. GE Financial Investments Ltd v HMRC clarified that a UK company could only be deemed US-resident for treaty purposes if a listed criterion applied.)

Allocation of Income: Generally, business profits are taxed only by the residence state unless the source country has a permanent establishment (PE) there. Dividends, interest and royalties may be taxed by both countries but source-country tax is limited (e.g. 0–15%).
The country of residence then allows relief. Most UK treaties use the credit method (Article 23B of OECD Model). For example, the UK–USA DTA (2001) Article 24(4)(a) requires the UK to credit US tax paid “in accordance with this Convention” on US-source income against UK tax on the same profits. (That phrase means the US tax cannot exceed the treaty’s permitted amount.)

Treaty Limitations: Many treaties limit foreign tax rather than providing full credit. For instance, under the UK–Spain treaty a UK resident’s Spanish dividends may only be credited up to 15% of the dividend if that is the treaty withholding limit. HMRC’s guide notes that any excess (Spanish tax above 15%) is not creditable and must be borne by the taxpayer.

Exemption Provisions: Some treaties incorporate an exemption method (OECD Article 23A) for certain incomes (often not used in UK DTAs). More commonly the treaty will allocate exclusive rights: e.g. Article 17 (pensions) or Article 18 (teachers) often tax only in one state. HMRC guidance points out that if a DTA gives exclusive taxing rights to one country, then relief is moot – for example, if the treaty says only the source country taxes a particular income, the UK will not tax it at all.

Tax Sparing: UK treaties often do not recognize tax-sparing (i.e. giving relief for foreign tax “spared” by incentives), unless explicitly provided. TIOPA 2010 s.20-21 allow relief for tax sparing if the treaty so permits, but this is relatively rare in practice.

Residency: Only UK residents can claim relief. Non-residents pay UK tax only on UK-source income, so there is no overlap to relieve.

Same-Income Requirement: Relief is only allowed if the UK and foreign taxes are on the same income. Courts have emphasized that one must trace the foreign tax to the identical UK-taxed income (or gain). For example, profits taxed in a foreign partnership and then received as a distribution might or might not count, depending on facts (see Anson v HMRC (UKSC 2015) where the Supreme Court found a Delaware LLC’s profits did belong to a UK partner when profits arose, allowing relief).

Foreign Tax Evidence: The foreign tax must have been actually paid and “admissible” for credit. Tax-sparings or exemptions abroad do not count unless treaty allows. HMRC’s guidance notes that foreign tax will be credited only if supported by proper documentation – typically a foreign tax certificate, withholding tax voucher, or official tax payment receipt. (If claiming under a treaty, an overseas tax authority may require a UK Certificate of Residence to confirm UK residency.)

Limits on Credit: Remember the lower-of rule: credit cannot exceed UK tax. Also, treaty ceilings (as in the Spain example above) can restrict the creditable amount. Unused foreign tax is not refunded by HMRC (it might be reclaimed via foreign procedure if possible).

Time Limits: Claims for relief must be made within 4 years after the end of the tax year in question. In practice, this means you must include the claim (with calculations) on a timely Self Assessment tax return or amendment. (For companies, similar rules apply under FA98 Sch.18.)

Remittance Basis and Non-Doms: Until 2025, a UK resident non-domiciled person could elect the remittance basis, meaning foreign income was taxed in the UK only if remitted. Under the remittance basis, unremitted foreign income was not taxed at all, so no UK relief was given for foreign taxes on that unremitted income. From 6 April 2025 a new “foreign income and gains” regime replaced the old system. Practically, this means non-doms must be mindful: if foreign income is brought into the UK (or otherwise taxed here), then DTR can be claimed; if it remains offshore (under the old remittance basis), then no UK tax, no relief.

Documentation for Claims: To claim relief on a UK tax return, keep records of foreign taxes paid (e.g. official withholding tax certificates or tax return filings). If claiming treaty benefits, check if you need to apply for a UK Certificate of Residence – HMRC issues these to validate your UK residency for foreign authorities. Always attach the foreign tax calculation to your Self Assessment or company tax computations.

Interaction with Other Rules: Relief can interact with other regimes. For example, relief for underlying foreign tax on dividends (section 795 CTA 2009) exists only if certain “participation” conditions are met (not covered here). Also be aware of any anti-avoidance rules – e.g. hybrid mismatch rules may deny a credit if foreign tax is not genuine.

Anson v HMRC [2012] UKSC 44 (2015) – The Supreme Court ruled that US tax paid by a UK individual on his share of a Delaware LLC’s profits (treated as paid on his actual income share) could be credited against UK tax on LLC distributions. The key was factual: the FTT had found the LLC’s profits belonged to Mr. Anson as they arose, so the “same income” test was met. HMRC’s practice remains case-by-case but this confirmed that treaty relief can apply even if domestic law typically treated the LLC as a company.

Fowler v HMRC [2020] UKSC 22 – A landmark treaty case (a professional diver). The Supreme Court emphasized the purpose of treaties is to resolve double taxation. It held that a statutory deeming (the UK treating Mr. Fowler as trading) did not alter treaty terms; the treaty applied literally to employment income, allowing it to be taxed in the UK despite an artificial deeming elsewhere. (The case is often cited for the “purpose of the treaty is to avoid double taxation” principle.)

GE Financial Investments Ltd (GEFI) cases [2023-24] – A UK-incorporated finance company was treated as US-resident under US law (via share stapling to a US company). At FTT and UT, it was held dual-resident and eligible for US tax credit under Article 4(1) of the UK–US DTA. However, the Court of Appeal (July 2024) overturned this: it held that the DTA’s Article 4 criteria (domicile, residence, place of management, incorporation or “similar criterion”) did not include share-stapling. Thus, GEFI UK was not treaty-resident in the US and could not claim credit for US tax. This case underlines that treaty residence depends on explicitly listed factors, interpreted purposively.

Masters v HMRC [2025] UKFTT 967 – A UK ex-pat on a Portuguese pension scheme. The FTT held that SIPP withdrawals (from a transferred UK pension) were taxable only in Portugal under the UK–Portugal DTA (Article 17 on pensions). Mr. Masters had paid UK tax at source, so HMRC refunded it. This illustrates how treaty definitions (e.g. what constitutes “pension paid in consideration of past employment”) can lead to UK tax exemption and thus negating the need for relief.

Royal Bank of Canada v HMRC [2025] UKSC 2 – Although not about relief calculation, this Supreme Court case on a UK-Canada treaty (Article 6 on immovable property) confirmed that rights to North Sea oil payments fell under “immovable property” and thus the UK could tax them. The practical impact is that UK tax arises on those payments, and any Canadian tax paid would then be a candidate for UK credit (subject to treaty terms).

Q: Can I ever carry forward unused foreign tax credit? A: No. The UK credit is limited to the UK tax on that income, and any excess foreign tax cannot be carried forward or refunded by HMRC.

Q: What if I paid more foreign tax than shown on a dividend voucher? A: You can only claim credit for the actual foreign tax paid (up to treaty limits). If the DTA limits the withholding (e.g. to 10%), any extra is not creditable.

Q: I used the remittance basis on my tax return. Can I still claim foreign tax relief? A: Generally not. If you elected remittance basis (pre-2025), foreign income not remitted is not taxed in the UK, so there is no UK tax to offset. Only on foreign income brought into UK (taxed here) could credit be claimed. Under the new 2025 regime, foreign income is taxed differently – check current rules.

Q: What proof does HMRC need for a foreign tax credit claim? A: For UK purposes, you should keep evidence (foreign tax certificates, statements) but typically you report figures on your return. If claiming treaty benefits, a foreign tax authority may request a UK Certificate of Residence to prove you were UK tax-resident.

Q: How do I show the claim on my tax return? A: For individuals, use the Foreign pages (SA106) of the Self Assessment, and complete the Foreign Tax Credit pages (FTCRWS). Include the calculation (as in worked examples) showing the UK tax and credit. For companies, enter the foreign tax credit in the CT600 computations.

Q: What if HMRC disagrees with my calculation? A: HMRC or a tribunal may examine whether the same income test is met or if treaty provisions apply. Keep full workings. Disputes can be referred to HMRC’s Double Taxation Relief team or via MAP (Mutual Agreement Procedure) if it’s a treaty interpretation issue. Recent tribunals have accepted plain treaty language and the purpose of relief (e.g. Masters, Fowler).

The foreign tax suffered, and

The UK corporation tax attributable to that same income.

You cannot use the foreign tax credit.

The credit does not create or increase a UK loss.

The credit is generally lost.

Cannot usually be carried forward or back.

Cannot be group relieved.

Cannot increase trading losses.

Foreign tax appears in the tax expense line of the P&L.

It does not affect profit before tax.

If unrecoverable, it remains a permanent tax cost.

United States

Germany

France

Treaty relief usually reduces the tax before it is paid.

It does not create a refund mechanism for unusable UK credits.

Separate reclaim processes may apply if excess tax was withheld.

No UK tax arises.

No foreign tax credit is available.

Any foreign withholding tax becomes a cost unless recoverable under treaty.

Losses

Low taxable profits

Significant brought-forward relief

Effective tax rate

Forecast cash tax

Investment returns