Do I need to declare foreign income on my UK tax return?
Foreign income is one of the areas where UK tax can become confusing.
You may live in the UK but receive income from another country. You may have an overseas bank account, foreign dividends, rental income from a property abroad, a pension from another country, or income from work carried out overseas.
The key question is:
Do I need to tell HMRC about it?
In many cases, if you are UK tax resident, the answer is yes.
This guide explains the main points to consider.
UK tax residence is the starting point
Whether foreign income needs to be declared usually starts with your UK tax residence position.
If you are UK tax resident, you are normally taxable in the UK on your worldwide income and gains. This means foreign income may need to be included on your UK tax return, even if it has already been taxed overseas.
If you are not UK tax resident, you are generally not taxed in the UK on foreign income, although you may still be taxable in the UK on certain UK source income.
HMRC’s overview confirms that if you are UK resident, you will normally pay UK tax on foreign income, subject to any available reliefs or special rules. You can check the current guidance on the GOV.UK tax on foreign income page.
What counts as foreign income?
Foreign income can include many different types of income from outside the UK.
Common examples include:
- Overseas rental income
- Foreign bank interest
- Foreign dividends
- Overseas employment income
- Foreign self-employment income
- Overseas pension income
- Income from offshore funds
- Income from foreign trusts
- Royalties from overseas
- Income from foreign partnerships
- Other investment income from outside the UK
The fact that income is paid into a UK bank account does not make it UK income. Equally, the fact that income stays in an overseas account does not automatically mean it can be ignored.
The source of the income and your UK tax residence position are what matter.
Do I need to complete a Self Assessment tax return?
You may need to complete a Self Assessment tax return if you have foreign income to report.
Foreign income is usually reported using the foreign pages of the tax return, known as SA106.
HMRC says the SA106 foreign supplementary pages are used to declare foreign income and gains and to claim Foreign Tax Credit Relief. You can check the current form guidance on the GOV.UK SA106 foreign pages.
In some simpler cases, certain foreign income may be reported on the main tax return instead of the foreign pages, but this depends on the amount and type of income. If in doubt, it is better to check before filing.
Foreign income that has already been taxed overseas
Many people assume that if foreign income has already been taxed overseas, it does not need to be declared in the UK.
That is not always correct.
If you are UK tax resident, the income may still need to be reported on your UK tax return.
However, you may be able to claim relief for foreign tax already paid. This is commonly known as Foreign Tax Credit Relief.
Foreign Tax Credit Relief can help reduce or eliminate double taxation, but the calculation depends on the income type, the amount of foreign tax paid, the UK tax due and any relevant double tax treaty.
HMRC’s guidance explains that foreign tax credit relief may be claimed through Self Assessment where foreign tax has been paid on income or gains. You can check the current guidance on the GOV.UK foreign tax credit relief helpsheet.
Double tax treaties
The UK has double tax treaties with many countries.
A double tax treaty helps decide which country has taxing rights and how double taxation should be relieved.
For example, one country may have primary taxing rights over certain income, while the other gives credit for tax paid.
Treaties can apply differently depending on the type of income, such as:
- Employment income
- Rental income
- Dividends
- Interest
- Pensions
- Capital gains
- Business profits
The treaty position should be checked where the sums are significant or where both countries are taxing the same income.
Foreign rental income
If you are UK tax resident and own a rental property overseas, the rental profits may need to be declared on your UK tax return.
This can apply even if:
- The rent is paid into a foreign bank account
- The property is managed by an overseas agent
- Foreign tax has already been deducted
- The income is not brought to the UK
- You are also filing a tax return in the other country
The UK calculation may not be identical to the overseas calculation. Different rules may apply to allowable expenses, mortgage interest, depreciation, local taxes and timing.
Foreign rental income should be reviewed carefully so that the UK tax return is prepared correctly.
Foreign bank interest
Foreign bank interest may need to be declared if you are UK tax resident.
This can include interest from:
- Overseas savings accounts
- Foreign fixed term deposits
- Overseas current accounts
- Foreign bonds or similar products
You should usually report the gross amount before foreign tax, then claim any available relief for foreign tax paid where appropriate.
Even small amounts can be relevant, especially where they interact with savings allowances or other income.
Foreign dividends
Foreign dividends may need to be declared on your UK tax return if you are UK tax resident.
This can include dividends from:
- Overseas companies
- Foreign investment platforms
- Exchange traded funds
- Offshore funds
- Employee share plans involving overseas shares
Foreign dividends may be taxed differently overseas and in the UK.
You may need to consider:
- The gross dividend
- Foreign withholding tax
- UK dividend tax rates
- The dividend allowance
- Whether Foreign Tax Credit Relief is available
- Whether the investment is an offshore fund
Dividend tax rates and allowances can change, so it is worth checking the current position on the GOV.UK dividend tax page.
Overseas employment income
If you are UK tax resident and work overseas, employment income may need to be included on your UK tax return.
The position can depend on:
- Whether you were UK tax resident during the year
- Where your duties were performed
- Whether foreign tax was paid
- Whether a double tax treaty applies
- Whether your employer operated payroll overseas
- Whether split year treatment applies
- Whether you qualify for any specific relief
International employment income can be complex, especially where you move country during the tax year or work remotely across borders.
Foreign pensions
Foreign pension income may need to be declared in the UK if you are UK tax resident.
The UK tax treatment can depend on the type of pension and the double tax treaty with the country paying the pension.
Some pensions may be taxable only in one country. Others may be taxable in both, with relief given for foreign tax.
Pension income should be reviewed carefully, especially where the pension relates to government service, overseas employment, or a country with a specific treaty provision.
Foreign self-employment or business income
If you are UK tax resident and carry out self-employment or business activity overseas, the profits may need to be included on your UK tax return.
The position can depend on:
- Where the work was performed
- Where the business is based
- Whether you have a permanent establishment overseas
- Whether foreign tax has been paid
- Whether you are also taxable in another country
- Whether National Insurance or social security issues arise
This is an area where both UK and overseas advice may be needed.
Foreign capital gains
This article focuses on foreign income, but foreign capital gains should not be ignored.
If you are UK tax resident, gains on overseas assets may need to be reported in the UK.
This can include gains on:
- Overseas property
- Foreign shares
- Offshore funds
- Cryptoassets held on overseas platforms
- Business assets outside the UK
The UK tax rules may differ from the rules in the other country, and foreign tax credit relief may need to be considered.
What if I do not bring the money to the UK?
Many people ask whether foreign income needs to be declared if it is not brought into the UK.
For UK residents, the general position is that foreign income is normally taxable in the UK whether or not it is remitted to the UK.
The previous non-domiciled remittance basis rules were replaced from 6 April 2025 by a new Foreign Income and Gains regime for eligible individuals.
HMRC explains that UK residents may not have to pay UK tax on foreign income if they are eligible for Foreign Income and Gains relief, and that the previous non-domiciled remittance basis applied before 6 April 2025. You can check the current guidance on the GOV.UK foreign income and gains page.
The Foreign Income and Gains regime
From 6 April 2025, the previous remittance basis regime was replaced by the Foreign Income and Gains regime, often referred to as FIG.
This can provide relief for eligible individuals who are new or recent arrivals to the UK, but the conditions are specific.
HMRC’s guidance explains that the 4-year Foreign Income and Gains regime replaced the remittance basis from 6 April 2025, and that eligible individuals can claim relief so they do not pay UK tax on eligible foreign income and gains. You can check the current guidance on the GOV.UK Foreign Income and Gains regime page.
This is a specialist area. You should not assume the regime applies without checking eligibility.
Reporting in pounds sterling
UK tax returns are completed in pounds sterling.
Foreign income and foreign tax paid normally need to be converted into GBP.
The exchange rate used should be reasonable and applied consistently. Depending on the income type, you may need to use the rate at the date of receipt, an average rate, or another appropriate method.
You should keep records showing how the conversion was calculated.
Records to keep
If you have foreign income, good records are essential.
You should keep:
- Foreign tax returns
- Overseas tax assessments
- Payslips
- Rental statements
- Bank statements
- Dividend vouchers
- Pension statements
- Withholding tax certificates
- Property expense records
- Foreign tax payment receipts
- Exchange rate calculations
- Details of any foreign tax credit relief claimed
- Documents showing residence status where relevant
These records can be important if HMRC asks questions later.
Common mistakes
Common mistakes include:
- Assuming foreign income does not need to be declared because it stayed overseas
- Assuming foreign tax paid means the UK does not need to know about the income
- Forgetting small foreign bank interest
- Not reporting overseas rental income
- Reporting net income instead of gross income
- Not claiming Foreign Tax Credit Relief where available
- Using the wrong exchange rate
- Ignoring foreign capital gains
- Assuming the old non-dom remittance basis still applies
- Failing to complete the foreign pages where required
- Not checking double tax treaty treatment
Foreign income is an area where small mistakes can lead to wider issues.
Practical checklist
Before completing your UK tax return, ask:
- Was I UK tax resident during the tax year?
- Did I receive income from outside the UK?
- What type of foreign income was it?
- Was foreign tax deducted or paid?
- Do I need to complete the SA106 foreign pages?
- Is Foreign Tax Credit Relief available?
- Does a double tax treaty affect the treatment?
- Do I need to convert the income into pounds sterling?
- Have I kept evidence of the income and tax paid?
- Could the Foreign Income and Gains regime apply?
- Are there foreign capital gains to report as well?
How CooperFaure can help
CooperFaure can help individuals, landlords, directors and business owners understand how foreign income should be reported on a UK tax return.
We can support with:
- Reviewing foreign income sources
- Preparing Self Assessment tax returns
- Completing foreign pages where required
- Considering Foreign Tax Credit Relief
- Reviewing overseas rental income
- Considering foreign dividends and interest
- Reviewing foreign pension income
- Considering UK tax residence
- Identifying when specialist cross-border advice may be needed
If you receive income from outside the UK and are unsure whether it needs to be declared, it is best to check before your tax return is filed.