Writing a Will as an American Living in Mexico (2026 Guide)

Mexico is the number-one destination for American expats, with over 1.5 million US citizens living south of the border — from the retirement havens of Cabo San Lucas and Puerto Vallarta to the colonial cities of Mérida, Oaxaca, and San Miguel de Allende. For many, Mexico offers an affordable, sun-drenched lifestyle within easy reach of the US. But living in Mexico creates a unique set of estate planning challenges that every American should understand before assuming their US will covers everything.

This guide explains Mexican will requirements, the unique fideicomiso trust structure for coastal and border properties, the absence of Mexican inheritance tax, your continuing US estate tax obligations, and the practical steps you need to take to protect your estate.

Mexican Succession Law: The Basics

Mexico is a federal republic, and succession law is primarily governed at the state level — each of Mexico's 31 states and Mexico City has its own Civil Code. However, the rules are broadly similar across states because they are all based on the same federal template derived from the Napoleonic legal tradition.

Forced Heirship in Mexico

Mexican law does include forced heirship protections, but they are limited compared to France or Spain. The primary protection is for children and other dependants who may claim alimentos (support payments) from the estate if the will fails to provide adequate provision. Purely disinheriting a dependent child entirely is more difficult under Mexican law, but the overall forced heirship framework is less restrictive than in most EU countries.

The bottom line: you have significant freedom to leave your Mexican assets as you choose, particularly to a spouse or adult children, but a dependent minor should be provided for in the will to avoid a successful legal challenge.

Types of Wills in Mexico

Mexican law recognises several will forms, but the most common and reliable for foreign residents is the testamento público abierto:

• Testamento público abierto: Dictated or delivered to a notario público (Mexican notary) in the presence of witnesses. The notary drafts the will in Spanish, keeps the original, and registers it in the state's public will registry. A certified copy is given to the testator. This is by far the most common form used by expats.
• Testamento ológrafo: Entirely handwritten, dated, and signed by the testator — no witnesses required. It must be deposited with a notary for registration. Less commonly used and easier to challenge.
• Testamento cerrado: A sealed private will delivered to a notary. Rarely used today.

For Americans in Mexico, the testamento público abierto before a local notario público is strongly recommended. The notary will translate your wishes into Spanish legal language, ensure compliance with local state law, and register the will so it can be found and executed promptly after your death.

The Fideicomiso: Coastal and Border Property for Foreigners

Mexican law restricts foreign ownership of land within the zona restringida (restricted zone) — within 50 kilometres of the coast or 100 kilometres of an international border. This encompasses most of the popular expat destinations: Los Cabos, Puerto Vallarta, the Riviera Maya, Mazatlán, and Rocky Point.

Foreigners hold property in the restricted zone through a fideicomiso — a bank trust arrangement under which a Mexican bank (the trustee) holds legal title to the land on behalf of the foreign beneficiary. The fideicomiso is renewable every 50 years and grants the beneficiary full rights of use, enjoyment, sale, and rental.

What Happens to a Fideicomiso at Death?

When you set up a fideicomiso, you name one or more substitute beneficiaries (beneficiarios sustitutos) who will receive the beneficial interest in the trust when you die. This is critically important — if no substitute beneficiaries are named, or if they predecease you, the fideicomiso enters a complex legal process to transfer the interest to your estate, which can take years.

Your Mexican will alone is not sufficient to transfer a fideicomiso — the substitute beneficiary designation in the trust deed itself controls succession. You should ensure:

• Your fideicomiso agreement names your intended heirs as substitute beneficiaries
• The named substitute beneficiaries are updated after major life events
• Your Mexican will and your substitute beneficiary designations are consistent

Property Outside the Restricted Zone

In areas outside the restricted zone (such as Mexico City, Guadalajara, Monterrey, Mérida, and San Miguel de Allende), foreigners can hold property in their own name under a escritura pública (public deed). This property passes under your Mexican will in the normal succession process.

Mexican Inheritance Tax: There Is None

One of Mexico's most expat-friendly features: there is no federal inheritance tax. Beneficiaries who receive property by inheritance pay no income tax at the time of inheritance. However, if they later sell the inherited property, capital gains tax (ISR) may apply based on the difference between the original acquisition cost (from your purchase) and the sale price — so it's important to keep clear records of your original purchase price and any improvements.

Some states have local transfer taxes that apply when property is transferred at death, but these are generally modest. Your local notario can advise on the specific rules in your state.

US Estate Tax: Still Applies to Worldwide Assets

As a US citizen, your entire worldwide estate — including your Mexican home, fideicomiso interest, Mexican bank accounts, and Mexican investments — is subject to US federal estate tax. The 2026 exemption is approximately $13.99 million per individual. Married couples can effectively double this through portability.

There is no US-Mexico estate tax treaty, so there is no formal double-taxation relief mechanism. However, since Mexico imposes no inheritance tax, there is no double taxation in practice for most Americans in Mexico.

Foreign Tax Credit and Mexican Income Tax

If your beneficiaries are subject to Mexican income tax on gains from selling inherited property, they may be able to claim a credit against any US tax on the same gain. This is a complex area and requires advice from an accountant experienced in both US and Mexican tax law.

Mexican Probate: The Sucesión Process

If you die with assets in Mexico that require probate (i.e., assets held in your own name outside a fideicomiso or other trust structure), Mexican probate proceedings — sucesión — will be required. This involves:

1. Filing with the civil register in the state where the deceased had their last address in Mexico
2. Presenting the will (either the original testamento or a foreign will that has been apostilled and translated)
3. Court appointment of an executor (albacea) if not already named in the will
4. Inventory and valuation of Mexican assets
5. Distribution of assets to heirs and payment of any taxes or debts

Having a Mexican testamento significantly simplifies this process. The notario who holds your original will can present it directly to the courts without the need for foreign apostilles and translations.

Practical Steps for Americans in Mexico

1. Create a US-law will covering your worldwide assets including Mexican assets in general terms, and excluding specifically the assets covered by your Mexican will.
2. Have a testamento público abierto drafted by a Mexican notario covering your Mexican-based assets.
3. Update your fideicomiso substitute beneficiaries in the trust deed itself — don't rely solely on your will.
4. Keep records of your Mexican property purchase prices to help beneficiaries calculate any future capital gains tax exposure.
5. Inform your US executor about your Mexican assets and the location of your Mexican will.
6. Review US estate tax exposure with a cross-border tax professional — especially if your worldwide estate is near the exemption threshold.
7. Consider naming a Mexican-based representative in your Mexican will to assist with local proceedings — your US executor may not be able to act in Mexico.

Frequently Asked Questions