Estate Planning for Expats: A Cross-Border Guide for UK Expats Abroad

You left the UK years ago. Your life is now somewhere else: a flat in Lisbon, a house outside Cape Town, a posting in Dubai. But part of your financial story stayed behind. A workplace pension. An ISA you can no longer feed. Maybe a rental property back home. And here is the uncomfortable truth that catches many people off guard once they move abroad: your old UK will, drafted before you ever boarded that flight, may not do what you think it does once your estate spans two or more countries.

Estate planning for expats is the work of making sure your assets pass to the people you choose, in the way you intend, across every jurisdiction you are connected to. It means managing cross-border assets, navigating multiple tax systems, and reckoning with succession laws that differ from the common-law system you grew up with. For UK expats living outside the UK and Ireland, a good estate plan is rarely a single document; it is a coordinated plan. This guide walks through the framework: which country’s laws apply, how forced heirship can override your wishes, the Brussels IV regulation, whether you need multiple wills, how to avoid being taxed twice, and the documents beyond a will that quietly fall apart at a border. Cross-border legal advice needs a qualified solicitor in each relevant country; Opes coordinates the financial plan that ties it together.

What makes estate planning different when you are a UK expat?

A UK-only estate plan assumes one legal system, one tax authority, and one probate court. Expat life breaks all three of those assumptions at once. When you live abroad with assets in more than one country, several risks stack up if you do nothing or rely on a will written for a purely domestic life:

• Conflicting laws over who inherits and which court has authority over the estate.
• Delays and extra costs: foreign probate, certified translations, and legalisation of documents.
• Double taxation exposure, where two countries both claim a slice of the same asset.
• Out-of-date beneficiary nominations, plus powers of attorney that are not recognised across borders.

The constant for this audience is the UK-side financial footprint: a National Insurance record, one or more UK pensions, ISAs you still hold, and possibly UK property. Those assets stay anchored to UK rules even while your daily life answers to the law of your country of residence. A sound estate plan makes both systems work together rather than against each other. This is a planning framework, not a do-it-yourself kit, and the cost of getting it wrong, in tax, delay, and family conflict, dwarfs the cost of getting it right.

Which country’s laws apply to my estate: domicile, residence, nationality and asset location

Four separate concepts decide the outcome of an international estate, and they rarely all point at the same country. Knowing which one drives which result is the foundation of any expat estate plan. These four ideas get muddled constantly, yet each does a distinct job:

Concept	What it means	What it tends to drive
Domicile	A common-law concept of your permanent “home” country; historically very sticky and hard to shed once UK-acquired.	Historically the main trigger for UK inheritance tax on worldwide assets. Now largely replaced for IHT by long-term residence (see below).
Residence	Where you actually live, usually tested by day counts and ties in a given tax year.	Local income tax, local administration of the estate, and, from April 2025, UK inheritance tax via the long-residence regime.
Nationality / citizenship	The passport you hold.	Can drive succession law elections (Brussels IV) and, in some systems abroad, tax. The UK does not tax inheritance on citizenship alone.
Asset location (situs)	The physical or legal location of a specific asset, such as a house or a bank account.	Often determines which country’s probate and succession rules govern that particular asset, especially real estate.

This is where the challenge bites. Your home country and your host country can both assert competing claims over the same estate. Some systems levy estate tax by citizenship regardless of where you live; others tax based on the residency of the deceased, the beneficiary, or both. Property almost always answers to the law of the country it sits in, whatever your will says.

For UK purposes the rules changed significantly. From 6 April 2025, the UK moved from a domicile-based system to a residence-based one. If you have been UK tax resident for at least 10 of the previous 20 tax years, you are treated as a long-term resident and your worldwide assets fall within scope of UK inheritance tax, according to HMRC’s guidance for long-term UK residents. That status does not vanish the day you leave; there is a “tail” of between three and ten years after departure, scaling to how long you were resident. Many people assume years away have severed the UK tie, and often they have not.

A practical first step costs nothing. List every country you are connected to: lived in, own property in, hold investments or pensions in. Then map which asset falls under which legal and tax system, so your wishes can be carried out across all of them. That single exercise surfaces most problems before they become expensive.

How do forced heirship rules affect UK expats, and can my will override them?

In many civil-law countries you cannot freely disinherit your spouse or children. A fixed “reserved share” of your estate is theirs by law, and it can override the wishes in a UK-style will. Forced heirship is one of the genuine shocks of moving from the common-law world to the civil-law one. In England and Wales you have broad testamentary freedom; you can largely leave your estate to whomever you like. Cross the Channel, or settle in much of Latin America, the Middle East, or parts of Asia, and that freedom contracts sharply. Local law reserves a guaranteed portion for direct descendants and often a surviving spouse.

The implications for an expat are concrete:

• Your UK will may not control real estate located in a forced-heirship country; local reserved-share rules can take precedence.
• Attempting to disinherit a child abroad can be unwound by the courts.
• Marital property regimes, which vary by country, can change who owns what before succession even begins.

Specialist structuring sometimes enters here, always advice-led. A coordinated will strategy is the starting point, and depending on the country a trust or a life insurance wrapper may have a role. But trust treatment differs from place to place, and a trust can create as many problems as it solves if used carelessly. Forced heirship is a legal question first; your solicitor in the relevant country leads, and the estate plan follows.

What is the Brussels IV regulation and how can UK expats use it?

For UK expats settled in continental Europe, Brussels IV is one of the more useful tools available, and one of the most misunderstood. Formally the EU Succession Regulation, it applies where the deceased was habitually resident in a participating EU member state, and it lets you make an express election in your will for the law of your nationality to govern the succession of your estate, rather than the default law of where you live.

Why does that matter? If you are a British national living in, say, France or Spain, electing English and Welsh succession law in a properly drafted will can let you escape local reserved shares and distribute your estate according to your own wishes. That is a meaningful opportunity for many.

A few points to handle carefully:

• It is a formal legal election. It must be drafted correctly in the will; a casual mention will not do.
• It governs succession law, not tax. Brussels IV decides who inherits, not who pays any local estate or inheritance tax, which can still apply.
• Not every country participates, and outcomes are fact-specific. Ireland and Denmark opted out, and the UK was never bound by it after Brexit, though UK nationals can still benefit from the election in participating states.

Should I have multiple wills if I own assets in more than one country?

If you hold UK assets plus property or accounts in another country, separate wills are often recommended. A single will spanning multiple countries can grind through foreign probate, with one court waiting on another, plus translations and legalisation. Local wills, each limited to the assets in their own country, let each estate be administered under the correct law without that friction.

Done badly, though, multiple wills are a trap. The classic mistake is the standard revocation clause: a new will that begins “I revoke all former wills” can wipe out the very document you carefully drafted for another country. To do this safely:

• Limit each will explicitly to the assets and jurisdiction it covers, and say so in the document.
• Avoid blanket revocation clauses; use carefully worded, country-specific revocation instead.
• Align executors, key definitions, and administrative powers across the documents so they read as one coherent plan.

Logistics matter too. Keep track of where each original is stored, since some countries require it for probate, and maintain an asset register so your executors can actually find your accounts, pensions, and policies around the world. A perfect will is no use if nobody can locate what it governs.

How can UK expats avoid paying inheritance tax twice across countries?

The risk is structural. The UK may tax your worldwide estate because you are a long-term resident; your country of residence may tax the same assets under its own rules. Without planning, the same pound gets taxed on both sides, and your overall liability can climb well beyond what either country would charge alone.

The first place to look is the relevant treaty. The UK has a set of estate and inheritance tax conventions, separate from its income tax treaties, with a handful of countries; the full list of in-force UK double taxation conventions is published on gov.uk. These typically decide which country has the primary right to tax and provide credits so the same tax is not levied twice. Where no estate-tax treaty exists, and for most corridors there is none, unilateral relief or foreign tax credits may still cushion the blow.

Beyond treaties, several levers are worth discussing with an adviser:

• Review how each asset is owned: sole, joint, or through an entity. Ownership can change the tax liability more than people expect.
• Consider a trust where it genuinely fits, weighing the pros and cons. A cross-border trust is complex and can trigger unexpected reporting and tax in your country of residence.
• Use life insurance as a liquidity tool. A policy held in trust can fund an inheritance tax bill and support dependants, so the family is not forced to sell the house to pay HMRC.

One trap for the unwary deserves a flag. Cross-border holding companies and offshore structures, often sold as tidy solutions, can create unexpected UK tax outcomes. Take proper advice before implementing any structure; the clever-sounding wrapper is frequently the expensive mistake.

What documents do UK expats need beyond a will?

A will deals with death, but incapacity, dependants, and day-to-day authority need their own documents. Powers of attorney are the quiet failure point in many expat plans. A power of attorney, or its UK equivalent the lasting power of attorney, is generally not recognised in another country. If you lose capacity while living abroad, a UK document may carry no weight where you actually are. The fix is to put separate financial and medical or welfare documents in place, drafted to the requirements of both the UK and your host country. Incapacity planning deserves the same attention as death planning; arguably more, because you are alive to suffer the consequences of getting it wrong.

Other documents that protect your family:

• Guardianship intentions for minor children, where the law of your residence recognises them.
• Provision of income for a surviving spouse or partner, so they are not left short while an estate is administered.
• A clear picture of debts across countries: mortgages, personal guarantees, business obligations.

Then there is practical readiness. A “living will” or advance decision records your wishes about medical treatment, and funeral wishes should be written down somewhere your family will actually look. Responsibilities should be shared among trusted people in different countries, ideally someone in the same time zone as the assets they will deal with. Who will step in if something happens to you, and can they reach the right documents quickly?

How do beneficiary designations fit into an expat estate plan?

Many assets never touch your will at all. Pensions, life insurance policies, and certain investment accounts pass directly to whomever you have nominated, bypassing probate entirely. That is efficient when the nominations are right, and a disaster when they are not. For expats, stale or mismatched nominations are among the most common and most avoidable failures.

The expat-specific risks are real:

• Old nominations naming an ex-spouse, a deceased relative, or an outdated address.
• Inconsistent designations across providers and countries, so different parts of your estate pull in different directions.
• Nominations made on assumptions about residency that no longer hold true after you move abroad.

The remedy is an audit. Pull together every account: UK workplace pensions, SIPPs, offshore bonds, life cover, and any local-country equivalents. Confirm how each provider treats nominations when the holder lives abroad, then make sure every nomination is consistent with your wills and your overall intent. This is unglamorous housekeeping, but it routinely determines whether the right person inherits a pension worth six figures, or the wrong one does.

A cross-border estate-planning checklist

Pulling the framework together, here is the sequence most expat clients work through. It is a map, not a substitute for tailored advice.

Step	What it covers	Why it matters when you live abroad
1. Map your jurisdictions	List every country you are resident in, a national of, or hold assets in.	Reveals competing legal and tax claims before they become disputes.
2. Confirm your UK IHT position	Assess long-term residence status and the resulting “tail”.	Worldwide assets may be in scope even after years away.
3. Draft coordinated wills	Local wills per country, with aligned, non-conflicting clauses.	Speeds administration and avoids accidental revocation.
4. Put incapacity documents in place	Powers of attorney and medical directives in each country.	UK documents are rarely recognised abroad.
5. Audit beneficiary designations	Update nominations on pensions, policies, and accounts worldwide.	These assets pass outside the will and are easy to get wrong.

Frequently asked questions

What happens if I die abroad without a will?

Intestacy rules apply, usually those of your country of residence or the country where each asset is located. The result frequently conflicts with what you would have wanted, distributing your estate by a formula you never chose. Administration takes longer, costs more, and can leave dependants without access to funds for months. For an expat with assets in several countries, dying intestate is the most expensive way to settle an estate.

Do I need a UK will if I already have a will in my country of residence?

Often yes, but it depends on where your assets sit and how the two documents interact. A poorly drafted local will can unintentionally revoke your UK will, or vice versa, leaving part of your estate unprovided for. The safe approach is coordinated drafting, where each will is limited to its own jurisdiction and the set is designed to work together rather than in conflict.

How often should a UK expat review their estate plan?

Review after any major life event: marriage, divorce, a new child, moving country, buying property abroad, or a significant change in wealth. Tax law changes are another trigger; the UK shift to residence-based inheritance tax in April 2025 made many existing plans out of date overnight. Otherwise, a review every few years keeps the plan current.

Are UK powers of attorney valid in other countries?

Generally not. A UK lasting power of attorney is unlikely to be recognised where you live, and a local power of attorney is unlikely to be recognised in the UK. Most expats need separate documents in each relevant country, drafted to local requirements, so that someone can act for you wherever your assets and your medical care actually are.

Can I reduce inheritance tax by giving assets away during my lifetime?

Potentially. Under HMRC’s gift rules, most gifts fall outside your estate for UK inheritance tax if you survive seven years after making them, with taper relief reducing the rate on gifts made between three and seven years before death. You can also give away up to £3,000 each tax year under the annual exemption. As a long-term UK resident, these reliefs still apply to you, though how a gift is treated in your country of residence is a separate question worth checking locally.

Your next steps

Cross-border estate planning rewards early, coordinated action. Residence windows shift, tax rules change in two countries at once, and a will drafted for a domestic life quietly stops doing its job the moment your assets cross a border. The problems are solvable, and far cheaper to solve while you are alive and organised than to untangle afterwards.

At Opes Financial Planning International, we have supported expatriate clients around the world for over 30 years, working from Dublin wherever you have settled. The international arm is headed by Nick Reid, who is happy to talk through your situation at any stage, with no pressure and no jargon. We coordinate the financial plan that sits alongside your local solicitors, so the legal, tax, and financial pieces fit together.

To start, it helps to gather a few things: the countries you are resident in and a national of, where your property is located, a list of your accounts and pensions, any existing wills and powers of attorney, and your intended beneficiaries. From there we can map your jurisdictions, assess your UK inheritance tax position, and build a plan that works on both sides of the move.

When you are ready, get in touch with our team to talk it through. You can also read more about how we approach family wealth protection and, if a pension forms part of your estate, our guidance on UK pension transfers.