Living abroad complicates one of the most basic acts of planning: deciding who inherits what. Once you hold a home in one country, a bank account in another and perhaps a pension somewhere else, a single will written for a single legal system rarely does the whole job. Getting this right while you can saves your family from expensive, slow and sometimes bitter disputes later.
This guide explains, in plain terms, why cross-border estates are different, the main pitfalls expats fall into, and the decisions worth taking now. Inheritance rules vary enormously between countries and they change over time, so treat this as general background rather than advice on your own estate.
Why a cross-border estate is different
When everything you own sits in one country, succession is usually governed by that country's law and administered by its courts. The moment your life spans borders, several legal systems can claim a say at once. Different countries answer the core questions differently: which country's law applies, whether you are free to leave your assets to whomever you choose, who is entitled to a fixed share regardless of your wishes, and which authority has the power to administer the estate.
Two broad approaches exist. Some systems give you wide freedom to dispose of your assets as you like. Others impose forced heirship, reserving a guaranteed portion of your estate for close family — typically children and sometimes a spouse — that you cannot simply disinherit. If your assets straddle both kinds of system, the rules can pull in opposite directions, and a clause that is perfectly valid in one country may be partly overridden in another.
Which country's law governs your will?
A central question for any expat is which legal system decides how your estate is shared. Depending on the countries involved, the answer may turn on your nationality, your domicile (broadly, the place you treat as your permanent home), or your habitual residence. These concepts are technical and do not always match where you happen to live day to day, which is exactly why expats are caught out.
In some regions you may be allowed to choose the law of your nationality to govern your succession, and recording that choice clearly in your will can bring welcome certainty. But that option is not universal, and a choice that works for assets in one place may be ignored elsewhere — particularly for real estate, which many countries insist on governing by their own local law no matter what your will says. Because the rules on applicable law are among the most complex in this field, this is one area where general reading is no substitute for advice tailored to the specific countries where you hold assets.
One will or several?
A common dilemma is whether to make a single worldwide will or separate wills for separate countries. Each approach has trade-offs.
- A single will covering everything is simpler to keep consistent and reduces the risk of gaps, but it may need to be recognised and translated abroad, which can slow down administration.
- Separate wills, each dealing with assets in one country, can speed up local administration and respect local formalities — but they must be drafted together so that one does not accidentally revoke another or leave part of your estate uncovered.
The danger with multiple wills is a careless revocation clause. A standard line stating that a new will revokes "all previous wills" can wipe out the very document meant to deal with your assets in another country. If you go down the multiple-will route, the wills should be coordinated by advisers who can see the whole picture.
Formalities: getting the will validly signed
Each country has its own rules on how a will must be made and witnessed, and a will that fails the local formalities may be treated as if it never existed. Requirements differ on points such as whether the will must be handwritten, how many witnesses are needed, who may witness, and whether a notary or official registration is involved.
International conventions can help a will made in one country be recognised in another, and some countries accept wills that comply with the formalities of various connected jurisdictions. Even so, you should not assume a will valid where you signed it will be accepted everywhere your assets are. Confirming the formalities for each relevant country before you sign is far cheaper than litigating validity after your death.
Forced heirship and reserved shares
If any of your assets are in a country that protects certain heirs, you may have less freedom than you expect. Reserved-share rules can guarantee children, and sometimes a surviving spouse, a fixed slice of the estate that overrides contrary instructions in your will. Expats sometimes try to leave everything to a new partner or a single child, only for the plan to be unwound because a protected heir claims their statutory portion.
There are legitimate ways to plan around these constraints — for example, by structuring how and where you hold assets, or by choosing an applicable law that permits greater freedom where that option exists. These strategies are technical and must respect the rules of every country involved, so they are best designed with professional help rather than improvised.
Tax, probate and practical traps
Inheritance can trigger tax in more than one country at once: where the asset is located, where you were resident or domiciled, and sometimes where the heir lives. Treaties and reliefs may reduce or prevent double taxation, but they do not always exist between the countries that matter to you. Rates, thresholds and exemptions are set by law and change regularly, so any figure you read today should be re-checked before you rely on it.
Beyond tax, watch for these recurring problems:
- Probate in several countries. Your executors may have to obtain authority to deal with assets in each country separately, which takes time and money.
- Frozen accounts. Banks abroad may freeze accounts until local formalities are met, leaving a surviving spouse short of funds.
- Marital property regimes. In some countries the rules governing property between spouses interact with succession and can change who owns what on death.
- Out-of-date documents. A move, marriage, divorce or new child can disrupt or even invalidate an existing will.
Keeping your plan current
A cross-border will is not a document you sign once and forget. Each time you move country, buy or sell property abroad, change your family situation, or the law in a relevant country shifts, your plan should be reviewed. An arrangement that was sound when you were resident in one country can quietly stop working after you relocate, because the connecting factors that decide applicable law and tax may have changed.
Getting it right
A well-made cross-border will protects the people you care about from delay, double taxation and conflict — but the rules on applicable law, forced heirship, formalities and tax differ from country to country and change over time. Because so much depends on where your assets are, your nationality, your domicile and your family circumstances, the safest step when real value is at stake is to speak with a qualified inheritance lawyer who understands the specific countries involved and can confirm the current rules before you decide how to structure your estate.