Foreign Income Reporting: A Complete UK Guide

If you live in the UK and have income from overseas investments, employment, property, or pensions, you must report it to HMRC on your self assessment tax return. Foreign income reporting is done through supplementary pages, most commonly SA106, and requires careful attention to exchange rates, foreign tax credits, and the timing of income recognition.

Who Must Report Foreign Income

UK residents are taxed on their worldwide income. This means you must report all foreign income on your UK tax return, regardless of whether you brought the money into the UK. This includes dividends from overseas companies, interest on foreign bank accounts, rental income from overseas property, foreign employment income, and overseas pension income.

If your only foreign income is dividends or interest under £300 total, and you have no other reason to file a return, you may not need to report it. However, if HMRC asks you to file a return, you must include all your income, both UK and foreign.

The SA106 Supplementary Pages

Foreign income is reported on the SA106 supplementary pages of the self assessment return. The form has separate sections for different types of foreign income: employment, pensions, property, savings and investments, and dividends. You must complete each section that applies to you and provide details of the country of source, the gross amount, the foreign tax paid, and any UK tax reliefs claimed.

You also need to declare foreign income on the main SA100 return, cross-referencing to the SA106 pages. The SA106 must be submitted as part of your overall tax return by 31 January following the end of the tax year for online filing.

Exchange Rates

Foreign income must be converted to sterling using the spot rate on the date the income arises, or an average rate for the period if HMRC approves it. HMRC publishes monthly average exchange rates for major currencies, but you can use any reasonable rate provided you apply it consistently. For dividends, the date the dividend is declared is generally the relevant date. For employment income, the date of receipt is used.

It is important to keep records of the exchange rates you use. If HMRC enquires into your return, you must be able to justify the rates applied. Using HMRC's published rates is the simplest approach.

Foreign Tax Credits

To prevent double taxation, you can claim foreign tax credit relief for tax paid in the source country. The credit is limited to the lower of the foreign tax paid and the UK tax attributable to the same income. If the foreign tax exceeds the UK tax, the excess cannot be refunded but may be carried forward or back in certain circumstances.

Claim the credit on the SA106 by showing the foreign tax deducted. You must hold evidence of the foreign tax paid, such as dividend vouchers, tax certificates, or official tax returns. HMRC may ask to see this evidence during an enquiry.

Timing Differences

One of the most challenging areas of foreign income reporting is timing differences. Foreign income may be taxed in the source country in a different tax year than it is in the UK. For example, US dividends may be taxable in the US in one calendar year but in the UK in a different tax year. You must report the income in the UK tax year it arises under UK tax law, which may differ from the foreign tax year.

Overseas property income is taxed on the profits arising in the tax year, calculated using UK property income rules. This means you may need to adjust the foreign tax computation to match UK rules before reporting.

Common Errors

The most common errors in foreign income reporting include: failing to report foreign income at all, using the wrong exchange rate, claiming foreign tax credits without evidence, double-counting income that is also reported by a nominee or broker, and mismatching tax years. HMRC's Connect system is highly effective at identifying anomalies in foreign income reporting, particularly where information has been received through automatic exchange agreements such as the CRS.

If you discover an error in previous years' returns, you should correct it using the disclosure facilities available, which may include the Worldwide Disclosure Facility or the digital disclosure service, depending on whether the error was careless or deliberate.

Browse more UK international tax and cross-border guides or try our calculators.