Global Wealth

What "Global Wealth" Actually Means

For most of financial history, "global" wealth simply meant owning foreign stocks. Today the term describes something far more complicated: families whose lives, assets, and legal obligations are genuinely distributed across multiple countries at the same time. A family might have a cross-border structure that evolved organically — a founder who built a business in one country, married a citizen of another, sent children to university abroad, and retired somewhere warm — without ever deciding, all at once, to become internationally complex.

The result is a portfolio of overlapping legal identities. Each family member may hold different citizenship and residency statuses. Each jurisdiction where assets sit has its own rules about taxation, reporting, and who is entitled to those assets when someone dies. The problem is not that any one country's rules are unreasonable. The problem is that they were not designed with one another in mind.

The Recurring Problem Set

Multiple Tax Systems

Most countries tax their residents on worldwide income. Some — a small number — also tax their citizens regardless of where they live. A family member who is both a citizen of one country and a resident of another may find herself legally obligated to report and pay tax to two governments on the same income. International tax reporting regimes exist to address some of this overlap, but they are imperfect, and the details matter enormously.

Estate and inheritance taxes add another layer. One country may levy a tax on the estate of the person who died; another may levy a tax on the person who receives the inheritance. A third country where the asset sits may claim its own share. Tax treaties between countries can reduce or eliminate some of this overlap, but not every pair of countries has a treaty, and the treaties that exist often exclude certain asset types or apply only under specific conditions. A qualified cross-border tax attorney must evaluate any particular family's situation.

Reporting Regimes

Independent of how much tax is owed, families with international assets face extensive disclosure obligations. Foreign bank accounts, foreign financial assets, interests in foreign entities, and beneficial ownership of foreign trusts all carry their own filing requirements — and the deadlines, thresholds, and penalties vary by country and by form. The FBAR, FATCA, and CRS frameworks are among the most widely encountered, but they are not the only ones. Missing a filing that carries no tax consequence can nonetheless trigger penalties that dwarf the value of the underlying account.

Because these obligations follow the individual rather than just the account, a family member who moves countries — even temporarily — may trigger new reporting duties that persist long after the move. Families are frequently surprised to learn that becoming a tax resident of a new country does not automatically end their obligations to the previous one.

Currency Exposure

Families who hold assets, liabilities, and spending needs across multiple currencies face a structural mismatch that does not exist for purely domestic families. A portfolio denominated in one currency funds school fees in a second and a mortgage in a third. When exchange rates shift, the real value of those assets changes even if every underlying investment performs exactly as expected. Currency exposure is often invisible until it isn't — and by then the magnitude of the mismatch can be significant.

Global custody and banking arrangements that allow families to hold accounts in multiple currencies, and to move funds efficiently across borders, are one part of the solution. Whether and how to hedge currency risk is a separate question that families sometimes evaluate with advisers who specialize in that area.

Succession Conflicts Between Legal Systems

Inheritance law is one of the areas where legal systems diverge most sharply. Some countries apply the law of the country where the asset is located (the situs rule). Others apply the law of the deceased's domicile. A small number apply mandatory "forced heirship" rules — legal requirements that a certain fraction of an estate must pass to specific relatives, regardless of what the will says. A trust that is perfectly valid under the law of the jurisdiction where it was established may be ignored or recharacterized by a court in another country that does not recognize the trust concept.

The practical consequence is that a single will or a single trust structure, drafted in one country, is unlikely to govern all of a family's assets cleanly. Families often work with counsel in each relevant jurisdiction to create coordinated — but locally valid — documents. This is expensive and requires careful coordination so the documents do not accidentally conflict with one another.

Banking Access

Banks in many countries apply stringent Know Your Customer and anti-money-laundering rules that make it difficult for non-residents to open or maintain accounts. A family member who moves abroad may find that their existing accounts are closed, and that opening new ones requires extensive documentation. Families with complex ownership structures — trusts, holding companies, foundations — often face additional scrutiny because the beneficial owner is not obvious from the account title alone. Private banking relationships can sometimes ease this access, but even sophisticated private banks have tightened their onboarding requirements significantly in recent years.

Who Encounters These Issues

Global wealth issues are not confined to families who set out to be international. Consider a few hypothetical situations that illustrate how ordinary life creates extraordinary complexity:

• A hypothetical technology entrepreneur who was born in one country, built her company in a second, and sold it while living in a third — then retired to a fourth with her spouse, who holds a different passport entirely.
• A hypothetical multigenerational family whose patriarch immigrated decades ago but whose grandchildren are dual citizens by birth, some of whom have moved to work in Europe or Asia.
• A hypothetical family whose estate plan includes a trust established in a common-law jurisdiction, holding real estate located in a civil-law country that does not recognize trusts.

None of these families necessarily did anything wrong. They simply lived internationally, and the legal and tax systems around them were not designed to accommodate that gracefully. As described in Complexity, Not Net Worth, Drives Structure, it is the intersection of multiple systems — not the size of the balance sheet — that creates the need for sophisticated planning.

The Professional Cast

Managing international wealth well requires a team, not a generalist. The professionals typically involved include:

• Cross-border tax counsel. Attorneys who specialize in the intersection of two or more countries' tax systems — not simply a domestic tax lawyer who has read a treaty. Each relevant jurisdiction may require its own specialist.
• International estate planning attorneys. Lawyers who understand succession law in multiple countries and can coordinate documents that are locally valid and mutually consistent.
• Multinational CPAs or tax compliance firms. Preparers who can file returns and information reports in multiple countries, track reporting deadlines across jurisdictions, and identify conflicts before they become penalties.
• Global custodians and private bankers. Institutions that can hold assets in multiple currencies, across multiple jurisdictions, and provide consolidated reporting. See Global Custody and Banking.
• Currency and treasury specialists. Professionals who help families understand and manage their exposure to exchange rate movements.
• A coordinating adviser or family office. Someone — often a family office or a lead adviser — whose role is to ensure that the specialists are talking to one another and that decisions in one area do not inadvertently create problems in another.

This team tends to be larger, and more expensive, than families anticipate when they first encounter international complexity. The cost of coordination is real. So is the cost of not coordinating.

Why DIY International Planning Fails

The failure mode in international planning is almost never incompetence. It is incomplete information. A domestic attorney drafts an excellent trust — but does not know that the beneficiary recently became a tax resident abroad, triggering a deemed transfer. A family moves countries and dutifully files taxes in the new jurisdiction — but does not realize they remain filing-obligated in the prior one. A holding structure is established that works perfectly under the laws of Country A — but is treated as a Passive Foreign Investment Company under the rules of Country B, creating a punitive tax regime the family never intended.

These gaps emerge because each professional typically knows their own jurisdiction deeply and adjacent jurisdictions less thoroughly. No single adviser sees the full picture unless someone is explicitly assigned that role. Families navigating international complexity without a coordinating professional — or relying on advisers who do not regularly collaborate across borders — are particularly exposed.

The choice of residency or citizenship itself can have irreversible tax consequences. Some countries impose an exit tax — a deemed sale or distribution of assets at departure — that can generate a substantial tax bill even if no assets are actually sold. Understanding these consequences before a move, not after, is one of the most important services a cross-border tax adviser provides.

Getting Oriented: The Connected Topics

This page is a starting point. The specific topics that follow from it — each requiring its own careful professional review — are covered in detail across this section:

• Cross-Border Families covers the specific planning challenges that arise when family members live in different countries.
• International Reporting Regimes explains the disclosure frameworks families most commonly encounter and what triggers them.
• Residency and Citizenship Programs examines the options some families consider when choosing where to be based, and the tax implications of those choices.
• Global Custody and Banking covers how assets are held and moved across borders at scale.

Families with international complexity who have not yet taken a full inventory of their exposures — tax obligations, reporting duties, succession law conflicts, and currency risks — may also find it useful to review Managing Substantial Wealth as a broader orientation to structuring an advisory approach. A qualified attorney and CPA must evaluate any particular family's situation.