Domicile vs Residence in Estate Law: Why It Matters for Inheritance

Two Words That Control Billions in Inheritance

Tax residency, physical residence, and domicile look similar on paper and mean completely different things in estate law. Executors who confuse them can accidentally expose an entire worldwide estate to the wrong country's tax system — or trigger dual taxation by two countries that both claim the deceased was domiciled within their borders.

What Domicile Actually Means

Domicile is where the law considers your permanent home to be. It's not where you sleep most nights or where you pay income tax. Courts determine domicile by examining the deceased's long-term intentions: where they voted, where they maintained their primary bank accounts, where their family lived, where they planned to retire, and where they expressed the desire to remain indefinitely.

A person can live in London for 20 years, pay UK taxes, own a UK home, and still be domiciled in the United States if they always intended to return. Conversely, someone who moved to Singapore five years ago with no plan to leave may have acquired a Singapore domicile despite still holding a US passport.

In common-law systems that use the concept, a person starts with a domicile of origin, generally inherited from a parent at birth. Acquiring a domicile of choice requires both physical presence in the new jurisdiction and a clear intention to make it a permanent home. Without both elements, the domicile of origin persists.

How This Differs From Habitual Residence

The European Union Succession Regulation (Brussels IV) uses a different concept: habitual residence at the time of death. This is the default rule for successions opened on or after August 17, 2015, in participating EU member states, excluding Denmark and Ireland. Habitual residence is more factual and less intentional than domicile — it focuses on where the person actually lived, their social and family connections, and the duration and regularity of their presence.

For most people, domicile and habitual residence point to the same country. The problems arise for expats, dual citizens, and people who split their time between countries. A retired British couple who spend winters in Spain and summers in England may be habitually resident in Spain under Brussels IV, subjecting their entire worldwide estate to Spanish succession law — including Spain's forced heirship rules that reserve portions of the estate for children.

Why Both Countries Might Claim Domicile

The domicile test is subjective, which means two countries can reach opposite conclusions about the same person. If a US citizen dies while living in Germany, the US may consider them domiciled in the US (based on their passport, voting registration, and statements of intent to return), while Germany considers them domiciled in Germany (based on 15 years of physical presence, local employment, and family ties).

When both countries claim domicile, both assert the right to tax the worldwide estate. Bilateral estate tax treaties resolve this through a hierarchical tiebreaker: permanent home, center of vital interests, habitual abode, nationality. The US has active estate tax treaties with 16 countries including the UK, Canada, Germany, France, Australia, and Japan.

The Affidavit of Domicile

During estate administration, some financial institutions and transfer agents request an Affidavit of Domicile — a sworn statement attesting to where the deceased permanently lived. This document, often drafted by the executor's attorney and notarized, helps establish which state's or country's succession laws apply to movable property like bank accounts and securities.

The affidavit typically states the deceased's legal address, how long they lived there, and that they intended it as their permanent home. Transfer agents use it to determine whether state-level transfer taxes apply and which jurisdiction's unclaimed property laws govern abandoned assets.

Getting the domicile determination wrong has cascading consequences. It can affect treaty-based tax claims and which country's rules are applied to the estate. Have cross-border tax counsel assess the deceased's status and the assets in scope before filing.

Protecting the Estate From Domicile Disputes

The strongest protection is a nationality election under Brussels IV, available to anyone who dies habitually resident in an EU member state. By electing the law of their nationality in their will, a testator can override the habitual residence default and ensure their home country's succession law applies. A British expat in France, for example, can elect English law and preserve full testamentary freedom, bypassing French forced heirship.

For estates already in administration, the executor should gather every piece of domicile evidence early: voter registration, driver's license, club memberships, religious community ties, property ownership records, and any written statements of intent. The International Estate toolkit includes a domicile evidence worksheet and a treaty tiebreaker analysis framework to help document the deceased's connections before any tax authority asks.