How does US-Mexico estate planning work for Houston families?

Why does US-Mexico estate planning require two legal systems?

Estate planning is fundamentally territorial. The law that governs what happens to an asset when someone dies is generally the law of the place where that asset is located. Real property in Texas follows Texas law. Real property in Mexico follows Mexican law. Financial accounts held at US institutions follow US law; accounts at Mexican institutions follow Mexican law.

For Houston families with ties to Mexico, this creates a two-track planning problem. A Texas will and trust structure can be comprehensive for US-sited assets, but it does not automatically govern assets located in Mexico. Similarly, a Mexican will (testamento) addresses Mexico-sited property but has no effect on Texas real estate or US bank accounts.

The goal of US-Mexico estate planning is to coordinate the two sides so that each asset is covered by a clear succession mechanism under the law that governs it, and so that the US reporting obligations that attach to cross-border asset ownership are properly addressed.

What US documents form the core of a cross-border estate plan?

The US side of a cross-border plan uses the same core documents as any Texas estate plan, adapted to account for the cross-border context.

A Texas will or revocable living trust directs what happens to US-sited assets. For families with significant US assets, a revocable trust is often preferred because it avoids probate and allows for private, flexible administration. The trust agreement can be drafted to address the management and distribution of US assets specifically, and to coordinate with any Mexico-side structure.

A durable financial power of attorney designates an agent to manage US accounts and property during incapacity. A medical power of attorney and advance directive address healthcare decisions. These documents cover the US side of the picture and should be drafted under Texas law to be enforceable in Texas courts.

What is a fideicomiso and how does it affect estate planning?

A fideicomiso is a Mexican bank trust used by foreign nationals, including US citizens and permanent residents, 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.

In a fideicomiso, a Mexican bank holds legal title to the property as trustee. The US person holds beneficial interest and retains the rights to use, rent, and sell the property. The fideicomiso has a defined term and must be renewed periodically.

From a US estate planning perspective, the fideicomiso interest is an asset of the US person's estate. How that interest passes at death depends on the terms of the fideicomiso agreement and applicable Mexican law, which is why coordination with separately retained Mexican legal counsel is essential. A US attorney can address how the interest should be treated in the US estate plan and what US reporting obligations may attach to it.

What US reporting obligations apply to Mexican assets?

Holding assets in Mexico can trigger US federal reporting requirements. The two principal obligations are the FBAR (FinCEN Form 114) for foreign financial accounts and Form 8938 (under FATCA) for specified foreign financial assets.

US persons with a financial interest in or signature authority over foreign bank accounts must file an FBAR if the aggregate value of those accounts exceeded the threshold at any point during the calendar year. Form 8938 applies to a broader category of foreign financial assets and is filed with the federal income tax return.

These reporting requirements are separate from tax owed. Failure to file can carry significant civil and criminal penalties, so US persons with Mexican financial accounts or investment assets should confirm their reporting obligations with a qualified attorney or tax advisor who understands both regimes.

Real property held directly (not through a financial account) is generally not reportable on the FBAR but may need to be disclosed on Form 8938 or on other returns depending on how income from the property is treated. The reporting picture varies based on how the asset is held and structured.

How should US-Mexico families approach the Mexico side of planning?

Edison Legal advises on US law only. Mexican legal questions, including the preparation of a Mexican will, the structure and renewal of a fideicomiso, and the administration of a Mexican estate, require the involvement of a Mexican attorney licensed to practice in Mexico.

For Houston families with Mexican assets, the most practical approach is to work with a US attorney on the US-law components of the plan while separately engaging qualified Mexican counsel for the Mexico-law components. The two sets of documents should be coordinated so that each asset is covered without conflict or gap.

Common coordination points include ensuring that a US trust does not inadvertently conflict with the terms of an existing fideicomiso, that both the US will and any Mexican will are consistent in their overall intent, and that the US reporting obligations for Mexican assets are identified and addressed.

When to speak with a Houston cross-border estate planning attorney

This article provides general information only and does not constitute legal advice. Cross-border estate planning involves US law, and the Mexico-law questions require separately retained Mexican legal counsel. The interaction between the two systems, and the US federal reporting obligations that apply, vary based on how assets are held and who holds them.

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