Estate Planning for British Expats in Spain: The 2026 Guide

Spain is home to one of the largest concentrations of British nationals anywhere in Europe. More than 300,000 British citizens are registered as residents — concentrated on the Costa del Sol, Costa Blanca, Costa Brava, Mallorca, and in Madrid and Barcelona. The true number, including part-time residents and those not formally registered, is significantly higher.

For decades, British expats could approach their estate planning in Spain with relative legal simplicity: EU rules, including what became Brussels IV, created a framework that connected UK and Spanish succession law in a predictable way. Brexit ended that. The legal landscape for British nationals in Spain has changed materially since 31 January 2020 — and estate planning has not kept pace for most families.

The risks are real: UK Inheritance Tax on worldwide assets even after twenty years in Spain. A Spanish will that defaults to Spanish succession law if the law election clause is missing. ISAs that lose their tax-exempt status the moment you become a Spanish resident. UK pensions with complex cross-border tax treatment. And, increasingly, a digital estate — crypto, online accounts, passwords — that no will in any jurisdiction can transmit on its own.

This guide is a map of the terrain, not a substitute for legal advice. It covers the specific issues that British nationals living in Spain face in 2026.

Post-Brexit and EU Regulation 650/2012 — What Changed and What You Need to Do Now

What Brussels IV Did

EU Regulation 650/2012 (Brussels IV) came into application on 17 August 2015. For EU nationals living in another EU member state, it created a clear, treaty-based mechanism: you could elect the law of your nationality to govern your entire estate by including a professio iurisclause in your will. For British nationals living in Spain before Brexit, this meant including a clause electing English or Scottish law in your Spanish will — and that election was recognised across the EU as a matter of EU treaty law.

What Brexit Changed

The UK left the EU on 31 January 2020. Since then, the UK is no longer bound by or entitled to the protections of EU Regulation 650/2012. The professio iuris mechanism no longer applies to British nationals as a matter of EU treaty law.

This does not mean that a law election in your Spanish will is worthless.Spanish courts retain discretion to honour a foreign national's election of their home country's succession law under Spanish private international law rules. In practice, Spanish notaries and courts generally do continue to respect a UK national's election of English or Scottish law in their Spanish will. But this is now a practical rather than a treaty-based protection — and that difference matters.

If you are a British national living in Spain and you have a Spanish will, check whether it contains an explicit election of English law (or Scottish law, if applicable). If it does not — or if it was made before 2015 and relied on pre-Brussels IV assumptions — you should have it reviewed by a qualified cross-border succession lawyer. If you do not have a Spanish will at all, this is a matter of genuine urgency.

UK Domicile — The Hidden Trap That Catches British Expats by Surprise

This is the section that surprises most British expats in Spain — and it is, in practical terms, one of the most important.

What Is Domicile?

Domicile is a concept in English law (retained by Scotland and Northern Ireland with variations) that determines, in simplified terms, which country's legal system a person is most fundamentally connected to. It is not the same as tax residence. It is not the same as habitual residence. It is its own distinct concept — and it is extremely sticky.

Every person acquires a domicile of origin at birth — usually the domicile of their father at the time of their birth. For a British person born in England, this is an English domicile of origin. This domicile stays with you until you actively acquire a new one. To acquire a domicile of choice in Spain, you must be physically present in Spain andform the settled and unconditional intention to make Spain your permanent home — with no present intention of ever leaving. This is a high legal bar.

The Domicile Self-Assessment

Before assuming you have left UK domicile behind, work through this checklist with a qualified UK tax advisor:

UK IHT applies to the worldwide assets of individuals who are UK domiciledat the time of death — regardless of where they live. A British national who has lived in Marbella for 25 years, has a Spanish home, Spanish bank accounts, and Spanish grandchildren, but who has never formally acquired a Spanish domicile of choice, may still be UK-domiciled in law. Their entire worldwide estate — including the Spanish property and Spanish investments — is potentially subject to UK IHT at 40%.

Even for individuals who have successfully acquired a domicile of choice outside the UK, a further rule applies: you are treated as UK-domiciled (“deemed domiciled”) if you were resident in the UK for at least 15 of the previous 20 tax years. This rule was tightened in 2017. The practical effect is that a British national who moved to Spain at age 50 may not become non-UK-domiciled for IHT purposes until many years into their Spanish residency, and only if they have actively shed their UK domicile.

UK Inheritance Tax and Spanish ISD — Navigating Double Taxation

UK Inheritance Tax (IHT) — The Core Framework

UK IHT is charged at 40% on the net estate above the nil-rate band. The current rates and thresholds are:

Spanish ISD — Regional Rates Matter

Spain's Impuesto sobre Sucesiones y Donaciones(ISD) applies to assets situated in Spain, regardless of the deceased's nationality or residency. The rates and exemptions vary significantly by autonomous community:

The 1975 UK-Spain Double Taxation Treaty

The UK and Spain signed a Double Taxation Convention in relation to death duties on 21 October 1975. This treaty remains in force post-Brexit and is the primary mechanism for avoiding double taxation on Anglo-Spanish estates. How it works:

• Spain has primary taxing rights on Spanish-sited assets (real estate, bank accounts, investments in Spain)
• The UK taxes the worldwide estate (as the country of domicile) but gives credit for Spanish ISD paid on Spanish-sited assets
• Your heirs pay Spanish ISD first, then file a UK IHT return — HMRC gives credit for Spanish tax paid, so you are not taxed twice on the same assets

The critical caveat: the treaty only prevents double taxation if both returns are correctly filed and the credit is properly claimed. Spanish ISD must be filed within 6 months of death. UK IHT must be reported on form IHT400 with the relevant schedules. Both require specialist lawyers and tax advisors working in coordination.

ISAs, SIPPs, and UK Pensions in Spain — What Happens to Your UK Financial Life

ISAs — The Invisible Tax Problem

The Individual Savings Account (ISA) is the UK's most popular tax-exempt savings vehicle. Inside an ISA, interest, dividends, and capital gains are entirely free of UK tax. Spain does not recognise ISA tax exemptions. A British national who becomes resident in Spain for tax purposes must declare all ISA income and gains as Spanish taxable income under the Modelo 720 rules and on their annual Spanish income tax return (IRPF).

SIPPs and UK Pensions — Complex Cross-Border Territory

Self-Invested Personal Pensions (SIPPs) have long been popular with British expats. The cross-border treatment for Spanish residents is complex and requires specialist advice:

• During your lifetime: SIPP withdrawals are generally taxable income in Spain under the Spain-UK income tax double taxation treaty.
• On death: UK pension pots (including SIPPs not yet in drawdown) do not currently form part of the estate for UK IHT purposes, though this is subject to ongoing legislative review. The interaction with Spanish ISD for Spanish-resident heirs requires specialist advice.
• QROPS transfers: Since Brexit, some QROPS transfers that previously qualified as tax-free may be subject to the Overseas Transfer Charge (25%). Take specialist advice before any transfer.

UK State Pension and UK Property

The UK State Pension is still payable to British nationals living in Spain post-Brexit, under the terms of the UK-Spain Social Security Agreement. It is taxable income in Spain under IRPF rules.

If you own UK property, your heirs will need to obtain a UK Grant of Probate to deal with it after your death. Spanish probate does not extend to UK assets. A Spanish will does not govern UK assets. This is a practical reason why the dual will strategy matters: your UK will, administered through UK probate, handles UK property independently and efficiently.

The Digital Assets Problem — What No Will Can Transmit

A British expat in Spain in 2026 typically has a more complex digital estate than their parents' generation could have imagined. You may hold an ISA or SIPP on a UK online investment platform (Hargreaves Lansdown, AJ Bell, Vanguard), UK bank accounts accessible only via online banking credentials, cryptocurrency in a hardware wallet or exchange, a UK Monzo or Revolut account, and decades of photos and documents in iCloud or Google Drive.

Your Spanish will can name a beneficiary for a cryptocurrency wallet — but it cannot give them the seed phrase or private key. Your UK will can name your executor — but it cannot give them your Hargreaves Lansdown login. Your estate administrator can be appointed — but they cannot access your UK online banking without credentials.

The legal framework is complete. The practical transmission is not. This gap is particularly acute for British expats in Spain because your digital estate straddles two countries — and your UK investment platform may require a UK Grant of Probate before releasing funds, a process that takes months.

How Sucesio Addresses the Gap

Sucesio is a secure digital vault designed to complement your UK and Spanish estate plan — not replace it. It stores the information that legal documents cannot carry:

• Online platform credentials (UK banks, investment platforms, Spanish accounts)
• Seed phrases and private keys for cryptocurrency wallets
• Access instructions for each UK financial account and what your executor needs to do
• Instructions on where your Spanish will is deposited and who your Spanish abogado is
• Personal messages, family letters, and legacy documents

Sucesio transmits this information securely to your designated recipients after death is verified — through a structured process that does not rely on anyone finding a piece of paper in a drawer or remembering a password.

Practical Checklist for British Expats in Spain

Work through this checklist with your legal and financial advisors. It is not exhaustive and does not replace professional advice.

Legal Documents

• Spanish notarial will — executed before a Spanish notario, covering Spanish assets, with an explicit law election clause
• UK will — covering UK assets, explicitly excluding Spanish assets, naming a UK executor
• SIPP nomination — separate expression of wishes to your SIPP provider (separate from the will and does not go through probate)
• Power of attorney in Spain (poder notarial) — grants someone authority to act in Spain if incapacitated
• UK Lasting Power of Attorney — for financial affairs and health decisions in the UK

Domicile and Tax

• Domicile assessment — carried out by a UK specialist; do not assume you have left UK domicile
• IHT liability modelling — calculate your estate's UK IHT exposure with your current asset profile and domicile status
• Spanish tax residency confirmation — ensure you understand your Spanish IRPF obligations on UK income (pensions, ISA income)
• Modelo 720 compliance — annual overseas asset declaration for Spanish residents with foreign assets above €50,000 per category

Financial Planning

• ISA review — understand Spanish IRPF treatment of ISA income; review whether maintaining a large ISA makes sense as a Spanish resident
• SIPP/pension review — understand Spanish tax on UK pension withdrawals; take specialist advice before any QROPS transfer
• 1975 UK-Spain treaty credit structure — ensure your estate plan is structured so heirs can claim the treaty credit correctly
• ISD regional planning — if choosing where to buy Spanish property, consider autonomous community ISD rates

Practical Steps

• Asset inventory — a complete list of all assets in both countries with approximate values and account details
• Designate a specialist in each country — a UK solicitor experienced in non-resident estates, and a Spanish abogado with cross-border succession experience, who communicate with each other
• Share the 6-month deadline with your heirs — Spanish ISD must be filed within 6 months of death; UK heirs need to know this in advance
• Digital assets plan — a separate record (or Sucesio vault) of online accounts, credentials, and crypto access
• Family communication — tell your heirs where both wills are held and who the lawyers are in each country

How Sucesio Complements Your UK and Spanish Estate Plan

A well-structured Anglo-Spanish estate plan typically involves a Spanish notarial will with an explicit law election clause, a UK will for UK assets naming a UK executor, separate SIPP nominations and pension beneficiary designations, a domicile assessment and IHT liability model, and a designated specialist solicitor in the UK and abogado in Spain. Sucesio does not replace any of these elements. It fills a different gap: the practical transmission of information that legal documents cannot carry.

Your Spanish notario cannot include your Hargreaves Lansdown login in your estate file. Your UK will cannot attach your Bitcoin seed phrase. Your executor cannot access your NatWest online banking without credentials. Your heirs may wait months for UK probate before they can access UK accounts — but during that time, they still need to know the accounts exist and roughly what is in them.

Sucesio stores this information in an encrypted vault and releases it to your designated heirs after death is verified — through a structured process that requires no piece of paper in a drawer and no password guessing. For British expats in Spain specifically, Sucesio is particularly valuable for UK bank and investment platform access credentials, Spanish bank account credentials, crypto access, the location of your UK and Spanish wills and your lawyers' details in each country, and personal messages and legacy documents — letters to your children, family history, things you want them to know.

Your estate in 2026 is partly legal, partly financial — and partly digital. Sucesio addresses the digital part, so your heirs receive everything you intended to leave them.

Frequently Asked Questions