When Could SA106 Be Relevant?
The fact that you are paid in euros does not automatically mean you need to complete the SA106 foreign pages. For a UK-based sole trader receiving payment from an overseas client for work carried out as part of their UK business, the trading income would generally be reported through the self-employment pages.
SA106 can become relevant where you have genuine foreign income that falls within the foreign income sections, such as certain overseas interest, dividends, pensions or property income. It can also be relevant where you have paid tax overseas and need to claim Foreign Tax Credit Relief.
For example, imagine your UK business earns €20,000 from clients in France. You carry out the work from the UK and no French tax is deducted from your payments. The fact that your clients are French does not, by itself, mean you should put the €20,000 on SA106. It would generally form part of your self-employed trading income.
However, if foreign tax has actually been deducted from income and you are eligible to claim relief for that tax, the foreign tax and credit relief rules need to be considered separately. This is where the distinction between ordinary trading income and foreign income becomes particularly important.