Understanding the UK-Spain Double Tax Treaty: Key Considerations for Expats

Moving to Spain doesn’t automatically mean you’ll stop paying UK tax. Many expats remain unsure whether they’ll need to declare income in both countries, when they’ll become tax residents, and what the implications are for their income and financial stability.

While the UK and Spain have a Double Tax Treaty (DTT), which is designed to prevent the same income from being taxed twice, understanding how it applies isn’t always straightforward. Tax residency, the type of income received and how finances are structured will all influence an expat’s tax obligations.

We’ve answered some of the common questions we receive about the UK-Spain DTT and explained why professional advice is so often invaluable when planning a move or reviewing your financial arrangements.

Why Is the UK-Spain Double Tax Treaty Important for Expats?

The treaty helps coordinate how income and gains are taxed when both the UK and Spain may have taxing rights. It also provides mechanisms for relieving double taxation in qualifying circumstances.

Expats benefit from having clear rules about when and where they will be subject to tax but must apply the treaty correctly to ensure they don’t inadvertently miss a filing deadline or fail to report declarable income.

Do Expats Need to Pay Tax in Spain and the UK After a Relocation?

Not necessarily, no. Expats need to determine where they are a tax resident, and tax residency depends on several factors.

Spanish tax residence commonly depends on whether an individual spends more than 183 days in Spain during the calendar year, whether Spain is the main base of their economic activities or interests, and, in certain circumstances, where their spouse and dependent children habitually live.

What Happens When an Expat Becomes a Spanish Tax Resident?

Tax residency is separate from visas or residency permits. It is a status that means you are subject to most taxes in Spain and that those taxes will usually be payable against your worldwide income and gains, subject to the relevant rules. When this happens:

• Spanish tax residents are generally subject to Spanish tax on their worldwide income and gains, subject to applicable exemptions, domestic rules and double-tax treaty provisions.
• Residents may need to declare and pay taxes for the whole year, because the Spanish tax authority doesn’t typically recognise split-year residency.
•          Spanish residents may have to submit Modelo 720 where the value of assets within a relevant overseas-asset category exceeds the applicable reporting threshold, commonly €50,000. The test and subsequent reporting requirements are applied separately to each category.

If you are deemed a tax resident in both countries, the DTT applies a series of tiebreakers which may consider your permanent home, centre of vital interests, habitual abode, nationality and, where necessary, agreement between the competent authorities. They decide where you are taxed if both countries appear to have a valid claim as the taxing jurisdiction.

Which Types of Income Are Covered By the UK-Spain Tax Treaty?

The treaty covers most common types of income, including employment, pensions, dividends, interest, royalties and some capital gains. However, the way income is taxed may vary. For example:

• Employment income is usually taxed in the country where the expat performs the work
• UK government service pensions are generally taxed in the UK, but may instead be taxable only in Spain if the recipient is both resident in and a national of Spain
• Some private pensions will be taxed in the recipient’s place of residence, but this will depend on the circumstances and the individual’s tax position

While the treaty states how and where these incomes will be taxed, it also sets out how to claim tax credits if an expat has already paid a tax charge or had tax deducted at source.

This is where the DTT becomes very important for expats, as it can provide mechanisms for relieving double taxation where the relevant conditions are met.

However, the availability and amount of relief will depend on the type of income, the applicable treaty provisions and the individual’s circumstances, and relief may not eliminate every difference between the tax liabilities in the two countries.

How Does Tax Relief Work Under the UK-Spain Treaty?

Spanish residents receiving UK income may need to claim foreign tax relief, and there are specific mechanisms for doing so. This means either reclaiming tax deducted at source, applying for a tax exemption with HMRC, or ensuring the tax paid is credited against the liability in Spain.

The specifics, though, depend on the income, taking UK-based property earnings as an illustration:

• Spanish tax residents who own UK properties and earn rental income must pay UK income tax on the income reported to HMRC.
• They must then claim a credit in Spain when filing their annual Impuesto sobre la Renta de las Personas Físicas (IRPF) form to avoid double taxation.

Failing to apply for tax relief or to claim tax deductions can be costly. Treaty provisions won’t always be automatically applied on the individual’s behalf, and they need to be proactive about claiming.

What Are Withholding Taxes in the Tax Treaty Between Spain and the UK?

The treaty sets out caps and reduces withholding tax rates on certain passive income originating in the other country, such as dividends, royalties, and interest.

For example, portfolio dividends are generally capped at 10%, while certain direct-investment dividends may qualify for a 0% rate where the relevant conditions are met.

Interest and royalties are generally subject to a 0% treaty withholding rate, although the domestic tax treatment in the recipient’s country of residence still needs to be considered.

When Should Expats Seek Professional Advice About UK/Spanish Taxation?

Our recommendation is to speak with an experienced wealth manager before moving to Spain, ideally, or at any point when your circumstances change. That might be when you become a Spanish tax resident, when deciding whether to sell an asset, or when you need to review your portfolio or tax position.

A financial adviser can help assess how the treaty and a change of residence may affect an individual’s wider financial planning, while tax filings, treaty claims and calculations should be reviewed by qualified UK and Spanish tax professionals.

What to Do if You Have Concerns About Your Tax Position in Spain

The way the UK-Spain tax treaty applies depends on several factors. Whether you’re planning to relocate or have lived in Spain for some time, it is important to review your tax position and arrangements if you have any doubts about whether you’re declaring and paying tax correctly.

A Chase Buchanan adviser can help you review the financial-planning implications of living in Spain and identify areas where coordinated advice from qualified UK and Spanish tax professionals may be required.

© Chase Buchanan Private Wealth Management.
Chase Buchanan Ltd is authorised and regulated by the Cyprus Securities and Exchange Commission with CIF Licence 287/15 and offers its services in the EU on a cross-border basis as per the provisions of MiFID.
Chase Buchanan Insurance Services, Agents & Advisors is authorised and regulated by the Cyprus Insurance Companies Control Service with License No 6883 and offers services in the EU on a cross-border basis as per the provisions of the Insurance Distribution Directive (IDD).

Investing in financial instruments involves risk and may not be suitable for all investors. The value of investments may go up as well as down and past performance is not a reliable indicator of future results. You may lose part or all of your invested capital.

*Information correct as at September 2026