Why Ultra-Wealthy Families Need Cross-Border Estate Planning

Ultra-high-net-worth families often live, invest and give across borders. A plan that works in one country can misfire in another. Different rules on domicile, tax residency, marital property and forced heirship can alter who inherits and how much tax is due. Institutions may also block access to accounts until local requirements are met. A cross-border strategy brings these moving parts into one coherent framework, so heirs receive what you intend with fewer delays and fewer surprises.

Where Plans Break Across Borders

Countries define domicile and tax residency in different ways. One country may view you as a resident based on days present, another based on ties such as a home or family. Several civil law jurisdictions enforce forced heirship, which reserves a portion of an estate for children or a spouse regardless of what your will says.

Community property and separate property systems divide marital wealth differently. Without alignment, the same asset can face competing claims or double taxation. Bank secrecy and data rules can also slow access, especially when fiduciaries lack translated and apostilled documents.

Building A Multi-Jurisdiction Framework

Begin by documenting where you are treated as tax resident and where you are domiciled. Keep residency certificates, visa records and professional analyses that explain treaty positions.

Next, identify succession rules that could override your choices. Some jurisdictions allow you to elect the law of your nationality or habitual residence to govern your estate. Make that election clearly in your will or trust if it is available and ensure that each country where you hold assets will honor it.

Align legal structures with asset locations. Company shares, private funds and real estate often benefit from situs-appropriate holding entities or trusts that are recognized locally.

Confirm whether the jurisdictions you care about recognize common law trusts, civil law foundations, or both. Where recognition is limited, consider alternatives such as shareholder agreements, life insurance wrappers, or local testamentary tools.

Coordinating Fiduciaries and Access

Execution details matter. Appoint executors and trustees who can act in each country or name local co-fiduciaries where required. Prepare notarized and apostilled copies of core documents and translations into the languages your institutions require.

Maintain a secure inventory of accounts, safekeeping locations and key relationships, along with device passcodes and instructions for two factor authentication. These access steps are as necessary as the legal documents, since many institutions will not release information without them.

Philanthropy, Art, And Liquidity

Cross-border philanthropy can trigger registration, reporting, or withholding. Decide whether to use a single foundation, parallel entities, or donor-advised funds in more than one country, for art, yachts, aircraft and collectibles, track situs, export and cultural property restrictions and insurance conditions.

Plan liquidity for taxes that may be due before private business interests or real estate can be sold. Consider credit facilities, life insurance, or staged distributions to avoid forced sales at a discount.

Using Multiple Wills Safely

Many families benefit from separate wills for different countries. Each will should cover only assets in its jurisdiction and should state that it is limited in scope so it does not revoke the other will. Coordinate signing formalities, witnesses and governing law choices. Keep originals and certified copies in a location where fiduciaries can easily access them.

How An Estate Planning Law Firm Can Help

An estate planning law firm with cross-border experience can map domiciles and residencies, make governing law choices where permitted and tailor trusts or entities that local courts and registries recognize.

Key Takeaways

• Clarify jurisdiction from the start: domicile, tax residency and any governing law election drive every other choice.
• Match structures to the asset and the country: trusts, entities and agreements should be recognized where the property sits.
• Plan execution, not just drafting: name fiduciaries who can act locally and assemble translations and apostilles in advance.
• Model taxes and fund the bill: coordinate philanthropy and plan liquidity, so estates do not rely on forced sales.

Managing wealth across borders requires more than sophisticated investments—it demands a coordinated plan that accounts for each country’s legal, tax, and inheritance systems. At The Werner Law Firm, our experienced estate planning attorneys work closely with families who have international ties to develop cross-border strategies that protect assets, preserve privacy, and ensure seamless transfers to future generations. With the right guidance, your global legacy can remain as strong and structured as your ambitions.

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Reference: Forbes (September 24, 2025) “Cross-Border Estate Planning Guide, Essential Strategies For Ultra High-Net-Worth Families”