Editorial transparency and use of artificial intelligence
This article forms part of the CostaLuz Lawyers blog and is published for general informational and educational purposes only. It was prepared with the assistance of artificial intelligence tools and, before publication, was substantively reviewed and editorially approved by Maria de Castro, a Spanish-qualified lawyer registered with the Cádiz Bar Association under number 2745, founder of CostaLuz Lawyers and the person responsible for the editorial review of the published content.
This article does not constitute legal, tax, immigration, employment, estate-planning or investment advice and does not replace an individual assessment and the professional work of the appropriate CostaLuz Lawyers specialist. No action or omission should be based solely on this information.
Note: This article reflects 2026 rules and is undergoing final review by María Luisa de Castro (ICA Cádiz nº 2745). Specific figures and thresholds should be confirmed for your case — book a consultation or email marialuisa@costaluzlawyers.es.
The UK–Spain Double Taxation Treaty (DTT) allocates taxing rights between the two jurisdictions and prevents double taxation through credit + exemption mechanisms. This page covers the practical 2026 interpretation for UK expats in Spain: which country taxes your pension, investment income, and property income, and how to claim relief.
Last updated: April 2026. Any figure marked <<CLIENT-CONFIRM>> is pending BOE / AEAT verification before publication.
Side-by-side comparison
| Criterion | Option 1 | Option 2 |
|---|---|---|
| Government pensions | UK taxes (source state) | Spain exempts with progression |
| Private pensions | Generally resident state (Spain) | Exception: lump sums under certain conditions |
| UK rental income | UK taxes first (source state) | Spain credit for UK tax paid |
| UK dividends | UK may tax at treaty rate | Spain credits UK tax |
| UK capital gains on non-property | Generally resident state (Spain) | Spain taxes |
| UK capital gains on property | UK taxes (situs state) | Spain credits UK tax |
| ISA — special treatment? | UK tax-wrapped | Spain typically does not recognise wrapper |
Next step
Send a short description of your situation and we’ll confirm a fixed-price quote within 24 hours.
Direct to the CEO: marialuisa@costaluzlawyers.es · Flat fee · No percentage.
Frequently asked questions
I'm a UK expat retired in Spain — which country taxes my state pension?
The UK State Pension is taxed in Spain (resident state rule for non-government pensions). Government pensions (civil service, armed forces) are taxed in the UK with Spanish exemption-with-progression.
Does Spain recognise my UK ISA?
Generally no — the wrapper is a UK-specific construct. Spain treats the underlying assets (funds, shares) as ordinary investments and taxes the gains/dividends accordingly. This is a common planning oversight for UK expats.
How do I claim DTT credit for UK tax paid on rental income?
File your Spanish IRPF with the UK rental income declared, apply the DTT credit for UK income tax paid, and attach HMRC evidence. The credit is capped at the Spanish tax that would have been due on that income.
Does the DTT help with UK inheritance tax?
There is no UK–Spain inheritance-tax treaty. For HNWI with UK domicile, this creates double-exposure risk. Domicile planning and lifetime-gift strategies become important.
What does Costaluz charge for UK–Spain DTT advisory?
Flat fee per income-type review. Email marialuisa@costaluzlawyers.es.
This article provides general guidance only and does not constitute legal advice. For personalised advice tailored to your specific situation, please book a consultation with our team.