What bi-national trust structures work for US-Mexico families?

Why do US-Mexico families need more than one trust structure?

A trust is a creature of the law under which it was created. A Texas revocable living trust is effective for assets held in Texas and subject to US law. It does not automatically govern assets located in Mexico, because Mexican law does not recognize US trust arrangements in the same way that one US state recognizes a trust created under the laws of another state.

The result is that a US-Mexico family with property on both sides of the border typically cannot rely on a single document to cover everything. Each country's assets need to be addressed under the law that governs them, which requires structures established under each country's legal framework.

Coordinating the two sides is the central task of bi-national estate planning. The US attorney handles the US-law components and works with the family to identify where the Mexico-side documents must align. A separately retained Mexican attorney prepares the Mexico-side documents and confirms how they interact with any US arrangements.

How does a US revocable living trust apply to a bi-national estate?

A Texas revocable living trust is the most common vehicle for managing and distributing US-sited assets outside of probate. The grantor creates the trust, transfers US assets into it, and names a successor trustee to take over administration at death or incapacity. Because the trust, not the grantor's estate, holds the assets, they pass without a Texas probate proceeding.

For bi-national families, the trust agreement should be drafted with the cross-border context in mind. This means being explicit about which assets are in scope (US assets only), how the trustee should coordinate with Mexican counsel or a Mexican co-trustee on Mexico-side administration, and how beneficiaries who reside in Mexico receive distributions.

The revocable trust also provides the incapacity planning function. If the grantor becomes unable to manage their affairs, the successor trustee steps in to manage US accounts and property without a court-supervised guardianship proceeding.

What is a fideicomiso and how does it function as an estate planning tool?

A fideicomiso is a Mexican bank trust used by foreign nationals, including US citizens, to hold real property in Mexico's restricted zone. The restricted zone covers land within approximately 50 kilometers of Mexico's coastlines and 100 kilometers of its international borders. Foreign nationals cannot hold direct title to land in the restricted zone, so the fideicomiso is the standard vehicle for this purpose.

In a fideicomiso, a Mexican bank acts as trustee and holds legal title to the property. The US person (the beneficiary) holds the economic rights: the right to use, rent, improve, and sell the property. The fideicomiso is established for a defined term and must be renewed. The beneficiary designates successor beneficiaries who receive the property interest at death.

From the US side, a fideicomiso interest is part of the grantor's gross estate for federal estate tax purposes and must be disclosed in the estate plan. The US attorney addresses how the fideicomiso interest is treated within the US plan and whether any reporting obligations attach to it. The Mexican attorney handles the fideicomiso renewal, succession designation, and Mexico-law compliance.

What US reporting obligations apply to foreign trust interests?

US persons who have an interest in a foreign trust face specific reporting obligations. The general rule is that a US person who transfers assets to a foreign trust, or who is treated as the grantor of a foreign trust under the US tax rules, must file Form 3520 (Annual Return to Report Transactions with Foreign Trusts and Receipt of Certain Foreign Gifts) and Form 3520-A (Annual Information Return of Foreign Trust with a US Owner).

Whether a fideicomiso is a "foreign trust" for US tax and reporting purposes is a technical question that depends on how the arrangement is structured and classified under US rules. Some fiduciaries classify their fideicomiso as a foreign trust; others treat it differently based on specific characteristics. The classification has reporting consequences and should be confirmed with a qualified attorney or tax advisor rather than assumed.

Separately, a Mexican bank account or investment account held by the US person may trigger FBAR (FinCEN Form 114) and Form 8938 filing requirements depending on the account balance.

How are bi-national trust structures coordinated in practice?

Effective coordination starts with a complete inventory of all assets on both sides of the border, including how each asset is titled and what law governs it. The US attorney reviews the US-side picture and identifies which assets are, or should be, in the US trust. The Mexican attorney reviews the Mexican-side holdings.

The two sets of documents should then be reviewed against each other for consistency. A US trust that names one set of beneficiaries should not conflict with a fideicomiso succession designation that names different ones. The choice of trustees and successor trustees on each side should reflect who has the practical ability to administer assets in each country.

For larger estates, the coordination process may also involve considering whether any US estate tax planning tools, such as irrevocable trusts or family limited liability companies, should hold US assets in a way that reduces the taxable estate while still coordinating with the Mexican-side structure.

When to speak with a Houston bi-national estate planning attorney

This article provides general information only and does not constitute legal advice. References to Mexican trust structures are general background only. Edison Legal advises on US law; Mexico-law questions require separately retained Mexican legal counsel.

The estate planning attorneys at Edison Legal work with Houston-area US-Mexico families on the US-law side of bi-national planning, including coordination with Mexican counsel and identification of US reporting obligations. Request a planning consultation to discuss your situation.