Reporting Foreign Income for UK Freelancers with International Clients

A freelancer based in the UK who invoices a client in New York, Berlin, or Sydney often assumes that money earned abroad is somehow outside UK tax. It is not. A UK-resident, UK-domiciled freelancer is taxed on worldwide income, which means foreign client payments are UK-taxable in exactly the same way as domestic ones. The complications are not about whether to declare the income but about how to avoid being taxed twice on it, which is where double taxation treaties, Foreign Tax Credit Relief, and the SA106 foreign pages come in.

This piece walks UK tax residence and the worldwide-income rule, the arising basis versus the remittance basis, Foreign Tax Credit Relief, double taxation treaties, and the SA106 supplementary pages. It sits in [the freelancer Self-Assessment hub](/guide/freelancer-self-assessment-guide/) alongside the sister pieces on [late-filing penalties and HMRC appeals](/blog/late-filing-penalties-appeal-hmrc/) and [the £1,000 trading allowance](/blog/trading-allowance-1000-tax-free/).

UK residence and the worldwide-income rule

UK tax residence is determined by the Statutory Residence Test, which looks at days spent in the UK and ties such as work, home, and family. A freelancer who lives and works in the UK is almost always UK-resident. A UK-resident, UK-domiciled individual is taxed on the arising basis, meaning all worldwide income is taxed in the UK in the year it arises, whether or not the money is brought into the country. For the typical UK freelancer with international clients, this is the rule that applies: foreign earnings are UK-taxable as they are earned.

Foreign income is still trading income

When a UK freelancer provides services to an overseas client, the income is usually trading income of the UK self-employment, not a separate category of "foreign income" requiring special pages, provided the work is done in the UK. A London-based designer working from home for a US agency is carrying on a UK trade; the fee is UK self-employment turnover reported on the self-employment pages, converted to sterling. The SA106 foreign pages become relevant mainly where foreign tax has been withheld at source, or where there is genuinely foreign-source income such as overseas property, foreign dividends, or foreign interest.

This distinction matters because it determines where the income goes on the return and whether any special relief is needed. A freelancer who never leaves the UK and simply happens to bill overseas clients has, in most cases, a perfectly ordinary UK trade with foreign customers, and the international element changes nothing about how the profit is taxed. The position only becomes genuinely cross-border when the freelancer performs work physically abroad, has a fixed base in another country, or receives income that the other country also asserts a right to tax. Identifying which of these applies is the first step in deciding whether the SA106 and FTCR are in play at all.

Currency conversion

Foreign receipts must be converted to sterling for the Self-Assessment return. HMRC accepts the exchange rate at the date of the transaction, an average rate for the period, or HMRC's own published monthly and annual rates, provided the chosen method is used consistently. A freelancer invoicing in dollars should record both the dollar amount and the sterling equivalent at a defensible rate, keeping evidence of the rate used. Inconsistent or cherry-picked rates are a common enquiry trigger.

A practical point that catches freelancers out is the gap between the invoice date, the payment date, and the date the money is converted in the bank. Where a fee is invoiced in one month and paid in another, the exchange rate can move materially, and the sterling figure for tax follows the method consistently applied rather than whatever the bank happened to credit. Many freelancers find it simplest to use HMRC's published monthly average rate for all conversions in a year, which removes the temptation to pick the most favourable rate per transaction and gives a clean, defensible basis if HMRC ever asks how the sterling figures were arrived at.

Arising basis versus remittance basis

The arising basis taxes worldwide income as it arises and is the default for UK-domiciled residents. The remittance basis is an alternative available historically to non-domiciled UK residents, under which foreign income is taxed only when remitted (brought) to the UK. The remittance basis has always been a niche regime, it carries an annual charge for longer-term residents and the loss of the personal allowance, and its scope has been significantly reformed for 2025-26 onward as the government moves away from domicile-based rules toward a residence-based system. For the ordinary UK-domiciled freelancer, the arising basis applies and the remittance basis is not relevant.

When foreign tax has been withheld

Some countries require the paying client to withhold tax at source before remitting the freelancer's fee. This is most common with royalties and certain service payments. Where foreign tax has been correctly withheld under the rules of the other country and the relevant double taxation treaty, the UK freelancer can usually claim relief so the same income is not taxed twice. The income is still declared in full in the UK; the foreign tax already paid is then relieved against the UK liability.

Foreign Tax Credit Relief

Foreign Tax Credit Relief (FTCR) reduces the UK tax on a particular slice of foreign income by the amount of foreign tax already paid on that same income, capped at the UK tax that would otherwise be due on it. If a freelancer earned £5,000 from an overseas source and paid £600 of foreign tax on it, and the UK tax on that £5,000 would be £1,000, FTCR reduces the UK tax to £400. If the foreign tax had been £1,200 (more than the UK tax of £1,000), the credit is capped at £1,000 and the £200 excess is not refunded. FTCR is claimed on the SA106 foreign pages.

The cap explained: relief is limited to the UK tax on that income

The reason FTCR is capped at the UK tax on the same income is that the relief exists to prevent double taxation, not to refund foreign tax in general. If the foreign country taxed the income more heavily than the UK would, the UK does not hand back the excess, because the excess was never UK tax. This is why checking the relevant treaty before invoicing matters: where a treaty allows the freelancer to apply for reduced or zero withholding at source, the freelancer avoids overpaying abroad in the first place and is not left with an unrelievable excess. The alternative to FTCR, deducting the foreign tax as an expense rather than claiming it as a credit, is occasionally better in unusual loss situations, but for most freelancers the credit gives the larger relief.

Double taxation treaties

The UK has double taxation treaties with most major economies, including the US, Germany, France, Canada, Australia, and many others. These treaties allocate taxing rights between the two countries and set the maximum rate of withholding the source country may apply. A treaty may reduce or eliminate foreign withholding on service fees, meaning the freelancer can apply to the foreign authority for reduced withholding rather than overpaying abroad and claiming it all back through FTCR. Checking the relevant treaty before invoicing a new overseas client can prevent unnecessary foreign tax being deducted in the first place.

The SA106 foreign pages

The SA106 is the supplementary set of pages added to the SA100 Self-Assessment return for reporting foreign income and claiming relief. It covers foreign interest, foreign dividends, overseas property income, foreign pensions, and the Foreign Tax Credit Relief calculation. A freelancer whose overseas client work is simply UK trading income (work done in the UK) reports that on the self-employment pages and may not need the SA106 at all. The SA106 becomes necessary when there is genuinely foreign-source income or foreign tax to relieve.

• Foreign interest and dividends from overseas accounts or holdings.
• Income from property situated outside the UK.
• Foreign pensions and certain overseas employment income.
• The Foreign Tax Credit Relief claim for tax withheld abroad.

VAT and place of supply for overseas clients

Income tax is only part of the picture. For VAT, the place-of-supply rules generally treat business-to-business services supplied to a client outside the UK as outside the scope of UK VAT, so a VAT-registered freelancer often does not charge UK VAT to overseas business clients. The rules differ for business-to-consumer supplies and for certain service types. This is a separate question from income tax and is covered in the freelancer VAT guidance; the income still counts toward the VAT registration threshold even where no UK VAT is charged.

Do I declare foreign income if it stays in a foreign account?

Yes. Under the arising basis, the location of the money is irrelevant. A UK-resident freelancer who leaves dollar earnings in a US bank account still declares that income in the UK in the year it arises. The remittance basis, under which only money brought to the UK is taxed, is not available to UK-domiciled freelancers and has been substantially reformed for others. Leaving foreign earnings abroad does not defer or avoid UK tax for an ordinary UK-resident freelancer.

How does HMRC find out about foreign income?

HMRC receives information automatically from many countries under international exchange-of-information agreements, including the Common Reporting Standard, under which foreign banks report UK residents' account details to HMRC. Digital platforms also report seller earnings. Non-disclosure of foreign income is increasingly visible and routinely caught in compliance reviews, with penalties for offshore non-compliance that are higher than for purely domestic errors. Full declaration with FTCR is both the correct and the safest approach.

When to get specialist advice

Most UK freelancers with international clients have a straightforward position: declare the income, convert to sterling, claim FTCR where foreign tax was withheld. Specialist advice becomes worthwhile where there is genuine cross-border residence (time split between countries), overseas property, a foreign pension, a non-domiciled background, or significant foreign withholding under a treaty. An accountant familiar with the relevant treaty can often reduce foreign withholding at source and structure the FTCR claim correctly.