Fideicomiso and Form 3520: Is Your Bank Trust a Foreign Trust?

You signed a fideicomiso at the notario’s office, received your keys, and later heard someone at a dinner in Puerto Vallarta warn that Americans with Mexican bank trusts must file Form 3520 or face large IRS penalties. This guide explains when a fideicomiso counts as a foreign trust, when it does not, and how to file correctly.

What a Fideicomiso Really Is and Why the IRS Cares

When I bought my first place on the Pacific coast, I signed a stack of Spanish-language documents in a notario’s air-conditioned office. The word “fideicomiso” appeared on nearly every page. I nodded, initialled, and assumed the lawyer and the bank would handle everything. Months later, while filing my first US return from Mexico, I typed “fideicomiso” and “IRS” into a search bar. Within a few minutes I had convinced myself I owed a five-figure penalty for a form I had never heard of.

If that sounds like you, take a breath. The panic is understandable, and so is the confusion. It comes from two legal systems using the same word for two different things.

The Restricted Zone and the Bank in the Middle

Mexico’s constitution limits direct foreign ownership of land in a band along the coastlines and the international borders, known as the restricted zone. That band takes in Cancún, Playa del Carmen, Tulum, Puerto Vallarta, Los Cabos, Mazatlán, and most of the Baja peninsula, which covers many of the places Americans want to buy. A foreign individual cannot hold the escritura, the title deed, in their own name there. The fideicomiso is the workaround Mexico created so foreigners can still buy.

The mechanics are simple once you strip away the vocabulary. A Mexican bank acts as the trustee, called the fiduciario, and holds legal title to the property. You are the beneficiary, called the fideicomisario, and you keep the practical rights of ownership. You can live there, rent it out, renovate it, sell it, and name substitute beneficiaries who inherit your rights. The seller, or whoever transfers the property into the arrangement, is the settlor, called the fideicomitente. Permission for the arrangement comes from the Secretaría de Relaciones Exteriores. The bank charges an annual administration fee for its role, and the size of that fee varies by bank and contract. For a closer look at the Mexican side, including how the contract is set up and renewed, see What Is a Fideicomiso? A Foreigner’s Trust for Owning Coastal Property.

In daily life the bank does almost nothing. It does not manage your property, choose your tenants, invest your money, or decide when you sell. It holds the title and acts only when you instruct it to, for example to transfer the beneficiary rights to a buyer. I have spoken to my bank’s trust department perhaps three times in all the years I have owned my condo, and each time it was about paperwork I had started.

Why the Word Trust Sets Off Alarm Bells for Americans

In US tax law, “trust” is a loaded word. The IRS has long worried about Americans moving assets into offshore trusts to hide income or put wealth beyond US reach. For that reason, US persons who create, fund, own, or receive distributions from foreign trusts face some of the strictest reporting rules in the tax code. The forms are long, the penalties are large, and the IRS has historically enforced them hard.

A fideicomiso is a trust under Mexican law, the trustee is a foreign bank, and the asset is foreign real estate. On paper, that matches every element of a foreign trust. Before the IRS issued formal guidance, careful American owners and their preparers were stuck. Some filed the full set of foreign trust forms every year as a precaution. Others filed nothing and hoped. Both groups lost sleep over it.

The frustration I hear most from fellow expats is not really about the forms. It is that nobody in the transaction warned them. The Mexican notario deals with Mexican law, the bank deals with the trust contract, and the real estate agent deals with the sale. None of them is responsible for your US filings. That gap is where Americans get anxious, and it is where specialist firms like Taxes for Expats earn their keep.

What Form 3520 and Form 3520-A Actually Do

There are two forms in this story, and they do different jobs. Form 3520 is filed by a US person, meaning you as an individual. It reports certain transactions with foreign trusts: creating one, transferring property to one, owning one under the grantor trust rules, or receiving a distribution from one. Form 3520 also has a separate section for reporting large gifts and bequests received from foreign persons, which matters later in this guide.

Form 3520-A is the foreign trust’s own annual information return. In theory the trust files it. In practice, when a foreign trust has a US owner, the US owner must make sure it gets filed. If the foreign trustee will not file it, the US owner generally has to prepare a substitute version and attach it to their own Form 3520. A Mexican bank acting as fiduciario is not going to prepare US information returns for you, so the burden would land on you if the arrangement counted as a foreign trust.

The penalties for missing either form can be steep. They are calculated by reference to the amounts or value involved and can grow if the failure continues after the IRS sends a notice. This is why the question in this guide’s title matters. If your fideicomiso is a foreign trust for US purposes, you have a heavy annual compliance job. If it is not, you can stop worrying about these two forms for your condo and focus on the reporting that does apply.

How the IRS Treats a Standard Mexican Land Trust

The good news comes first. For the typical American who bought a beach condo or a house in the restricted zone through a standard bank fideicomiso, the IRS has said directly that the arrangement is not a trust for US federal tax purposes.

Revenue Procedure 2013-14 in Plain English

The IRS addressed fideicomisos in Revenue Procedure 2013-14. That guidance describes a Mexican land trust, the standard fideicomiso foreigners use to hold real property in Mexico, and concludes that an arrangement fitting the description is not treated as a trust for federal tax purposes. Because it is not a trust, the foreign trust reporting rules do not apply to it. You do not file Form 3520 to report your relationship with it, and no Form 3520-A is required for it.

The reasoning matches what I described above. In a standard fideicomiso the beneficiary keeps all the economic substance of ownership, and the bank’s role is essentially to hold title so Mexican constitutional rules are satisfied. The IRS looked past the label to the substance and treated the arrangement as what it is in practice: you own the property, with a bank holding title on paper.

For a full treatment of the procedure, its background, and how preparers apply it, see Rev. Proc. 2013-14 Explained: Why Most Fideicomisos Escape Trust Reporting. The short version for most readers: if your fideicomiso is a plain-vanilla land trust, your condo does not make you a Form 3520 filer.

The Conditions Your Trust Has to Meet

“Most fideicomisos” is not “every fideicomiso,” and this is where a careful reading of your own contract matters. The relief applies to arrangements that fit the profile of a Mexican land trust. In practical terms, a fideicomiso fits that profile when these features are present:

• The trust agreement is created under Mexican law, with a Mexican bank acting as trustee.
• Its purpose is to let a foreign person hold and benefit from Mexican real property, the use the restricted-zone system was designed for.
• The beneficiary keeps the rights of an owner: to use and occupy the property, lease it, improve it, sell it, and receive the proceeds.
• The bank’s duties are limited to holding title and acting on the beneficiary’s instructions, with no real power to manage or invest.
• The trust holds the real property and nothing beyond it, such as investment portfolios or unrelated cash.

A standard residential fideicomiso drafted by a mainstream Mexican bank for a foreign buyer usually ticks every box. Trouble starts when a contract has been customised, when extra assets have been placed in the structure, or when the arrangement was built for a purpose beyond letting a foreigner own a home or commercial property.

This is the point where I tell friends to get a professional to read the actual contract. Your bank trust agreement is in Spanish, often runs to many pages, and uses terms that do not translate neatly into US concepts. A preparer who regularly handles Mexico-based clients, such as the team at Taxes for Expats, can review the clauses that matter and confirm in writing whether your arrangement fits the land trust profile. That written conclusion is valuable to keep in your records in case questions come up later.

What Treating It as Direct Ownership Means for Your Return

This part surprises people. When the IRS says your fideicomiso is not a trust, the reporting does not disappear. It changes form. For US purposes you are treated as owning the property directly, so everything that happens with the property is reported as if your name were on the escritura.

If you rent the property out, the rental income and expenses go on your US return the same way a rental in Ohio would, with depreciation, deductible costs, and the usual rules. If you also report that income to Mexico’s SAT, the foreign tax you pay may be creditable on the US side. The mechanics of reporting to both countries are covered in Renting Out Mexican Property: Reporting Income to the SAT and the IRS. When you sell, you calculate a US gain using your US cost basis and dollar-converted figures, and you may also face Mexican capital gains rules at closing. The interaction between the two calculations deserves its own explanation, which you will find in Selling a Home in Mexico as a US Citizen: Two Gain Calculations, One Sale.

Direct-ownership treatment also has a benefit. If the property is your main home and you meet the US ownership and use tests, the US home sale exclusion can apply as it would for a property you held in your own name. The bank holding title does not disqualify you, because for US purposes the bank is not the owner. Being treated as the owner also means real estate held directly is generally not a foreign financial account for FBAR purposes. Your Mexican bank accounts are a different matter, and I come back to them below.

When a Fideicomiso Can Still Pull You Into Trust Reporting

Most readers can relax about their condo. A minority cannot, and in my experience they tend to find out late, usually when they sell, inherit, or restructure. Here are the situations that need a closer look.

Trusts That Hold More Than Real Estate

The land trust profile assumes the trust holds real property and that the beneficiary controls it. Some fideicomisos stray from that. I have met owners whose trust contracts allowed the bank to hold cash reserves, invest rental proceeds, or hold other assets alongside the property. Once a structure holds and manages assets beyond the land, it starts to look like a trust in the US sense: an arrangement where a trustee protects and conserves property for beneficiaries.

Here is a scenario I have seen in different versions. A couple buys a villa near Tulum and rents it out heavily. To simplify cash flow, they agree to an arrangement in which rental income flows into an account administered under the trust and the bank invests surplus funds under the contract. On paper the trust now holds real estate plus an investment pool, and the bank has discretion over part of it. That is no longer the simple holding arrangement the IRS described. Whether it crosses into foreign trust territory depends on the exact terms, which is why it needs professional analysis instead of assumptions.

Even when the trust itself stays simple, keep separate accounts separate. A Mexican bank account in your own name that receives rental income is a foreign financial account you may need to report on an FBAR and possibly Form 8938, depending on balances and your filing situation. That account obligation exists whether or not your fideicomiso is a trust. See FBAR for Mexican Bank Accounts: Thresholds, Timing, and Penalties for how that side works.

Unusual Clauses and Estate Planning Layers

The second risk area is estate planning. A standard fideicomiso already includes substitute beneficiaries, so your rights pass to the people you name when you die without probate in Mexico. That feature is normal and does not take the arrangement outside the land trust profile. Problems arise when owners, often on the advice of planners back home, add layers.

One example is naming a US revocable living trust as the beneficiary of the fideicomiso. Another is a fideicomiso whose terms give the bank or a third party discretion over when and how beneficiaries receive property after the original owner’s death. Some contracts also include provisions for minors or for beneficiaries who cannot manage the property themselves. Each of these may serve a sensible family purpose. Each also moves the arrangement further from “a bank holding title for an owner who controls everything.”

I am not suggesting you avoid estate planning. A good Mexican will, sensible substitute beneficiaries, and coordination with your US plan are smart moves. Make sure whoever designs those layers understands the US reporting consequences before anything is signed. For the broader picture of which Mexican structures do create US filing obligations, see When a Mexican Trust Structure Does Trigger US Reporting.

Mexican Corporations, Developers, and Other Structures

Not every foreigner who owns Mexican real estate uses a fideicomiso. Some buy through a Mexican corporation, typically a sociedad anónima de capital variable, especially for commercial property or larger investment projects. Others buy into developments where the developer uses a master trust holding several units, with buyers holding rights under it. A Mexican corporation does not trigger Form 3520 because it is not a trust, but it can trigger other demanding US forms, such as Form 5471 for certain US shareholders of foreign corporations. The structure you choose shapes your paperwork for years.

The table below summarises how common Mexican property structures tend to play out on the US side. Treat it as a map for a conversation with your preparer, not as a final answer for any specific contract.

Ownership structure	Who holds legal title	How the IRS generally views it	Foreign trust forms	Other US reporting to expect
Direct title outside the restricted zone	You, in your own name on the escritura	Direct ownership of foreign real estate	Form 3520 and Form 3520-A not required for the property	Rental income on your return if rented; gain reported on sale
Standard bank fideicomiso fitting the land trust profile	Mexican bank as fiduciario	Not a trust; treated as direct ownership by the beneficiary	Form 3520 and Form 3520-A not required for the arrangement	Same as direct title: rental income and sale reported as an owner
Fideicomiso holding extra assets or giving the bank real discretion	Mexican bank as fiduciario	May fall outside the land trust profile; needs case-by-case review	Form 3520 and Form 3520-A may be required	Possible account reporting for cash or investments inside the structure
Fideicomiso with layered estate planning terms	Mexican bank as fiduciario	Depends on the terms; added discretion raises the risk	Form 3520 and Form 3520-A may be required	Coordination with your US estate plan and any US trust’s own filings
Mexican corporation owning the property	The corporation	Foreign corporation	Not a trust, so no Form 3520 for the property	Form 5471 may apply depending on ownership and control

The pattern is clear. The more an arrangement does beyond holding title for an owner who controls everything, the more likely it is to create extra US reporting. When I review my own setup each year, my main question is whether anything changed in the contract or in what the trust holds. If nothing changed and the arrangement was standard to begin with, my answer stays the same.

Form 3520 for Reasons That Have Nothing to Do With Your Condo

Here is a twist that catches many expats. You can confirm your fideicomiso is fine, put the land trust worry to rest, and still need to file Form 3520 for reasons unrelated to your property. Life in Mexico often involves money crossing the border between family members, and Form 3520 covers some of those flows.

Gifts and Inheritances From Mexican Family

Form 3520 has a separate section for US persons who receive large gifts or bequests from foreign persons. If you are a US citizen married to a Mexican national, or you have built close ties here, this matters. Suppose your Mexican father-in-law gives you and your spouse money toward a house in Querétaro. Or a Mexican relative dies and leaves you money or property. Receiving those funds is generally not taxable income on your US return, but if the amounts pass the reporting thresholds, you must report them on Form 3520.

To be clear, this is a reporting requirement, not a tax. The IRS wants to know about large inflows from foreign sources. The gift itself usually does not create a US tax bill for you as the recipient. Failing to report it can still bring penalties based on the amount received, so treating “no tax due” as “nothing to file” is a costly mistake.

The thresholds differ depending on whether the gift comes from a foreign individual or estate, or from a foreign corporation or partnership, and they can change. Ask your preparer to check the current figures for your tax year. The wider picture of how Mexico and the US each treat gifts, including the Mexican side’s own reporting expectations, is covered in Gift Tax Across Two Systems: Receiving Money From Mexican Family. Taxes for Expats regularly handles mixed-nationality households where these family transfers happen, and the gift section of Form 3520 is part of their normal Mexico workload.

Distributions From Genuine Foreign Trusts

The other non-condo route to Form 3520 is an actual foreign trust. That might be a trust created in Mexico for estate planning, a trust set up in another country by a relative that names you as beneficiary, or a structure a family business uses to hold assets. If you receive a distribution from a genuine foreign trust, or you are treated as its owner, Form 3520 reporting generally applies. Depending on the trust’s character, the tax treatment of distributions can be complicated.

Consider this scenario. An American woman living in Oaxaca City is named a beneficiary of a trust her late grandmother set up abroad. Every year the trustee sends her a payment. She has no fideicomiso and owns no property in Mexico, yet she has a clear Form 3520 obligation because she receives distributions from a foreign trust. If she also has signature authority over Mexican bank accounts, she has FBAR duties as well. None of this relates to real estate, which is why it is wise to think of Form 3520 as a form about foreign trusts and foreign gifts in general, not as “the fideicomiso form.”

The practical lesson: once you have answered the fideicomiso question, ask a second one. Did any money, property, or inheritance reach me this year from a foreign person, estate, or trust? If the answer is yes, raise it with your preparer before the return is filed, not afterward.

Deadlines, Extensions, and the Calendar That Matters

Let us say your situation does require Form 3520, either because your trust falls outside the land trust profile or because you received a large foreign gift. The next frustration is the calendar. Expats already juggle Mexican deadlines with the SAT and US deadlines with the IRS, and information returns add a third layer. The rules are workable once you see them laid out.

Form 3520 Due Dates for Americans Living in Mexico

For a calendar-year individual, Form 3520 is due on April 15, the same date as your regular income tax return. If you are a US citizen or resident who lives and works outside the United States and Puerto Rico, which describes many readers of this site, the due date moves to June 15, provided you attach a statement explaining that you qualify.

Extensions for Form 3520 are simple. If you are granted an extension of time to file your income tax return, for example by filing Form 4868, your Form 3520 deadline extends with it, to no later than October 15. You do not file a separate extension request for Form 3520. You check box 1k on Form 3520 to show that you are relying on your income tax return extension. In practice, if your 1040 is on extension, your Form 3520 travels with it.

This is helpful for expats, who often wait on Mexican documents, bank statements in Spanish, or a final figure from a notario before they can finish a return. For the full calendar of expat deadlines, including estimated payments and how the June and October dates interact, see US Tax Deadlines for Expats in Mexico: Extensions and Estimated Payments.

Form 3520-A and Why It Runs on Its Own Clock

Form 3520-A follows a different rule. Form 3520-A is the foreign trust’s own information return, and for a calendar-year trust it is due on March 15, a month before most individual deadlines. The extension for Form 3520-A is requested on Form 7004. A 1040 extension does not extend Form 3520-A. Filing Form 4868 for yourself does nothing for the trust’s return.

If you are the US owner of a foreign trust that will not file its own Form 3520-A, which is realistic when the trustee is a foreign institution with no interest in US forms, you prepare a substitute version and attach it to your own Form 3520, as described earlier. Owners of standard fideicomisos that fit the land trust profile do not file Form 3520-A for their property at all. This deadline matters only for arrangements that are genuinely foreign trusts in US terms.

The table below sets the two forms side by side.

Feature	Form 3520	Form 3520-A
Who files	The US person: owner, transferor, or recipient of distributions or large foreign gifts	The foreign trust, with the US owner responsible for making sure it is filed
Normal due date for calendar-year filers	April 15	March 15
US citizen or resident living and working outside the US and Puerto Rico	June 15, with a statement attached	March 15
Effect of a 1040 extension such as Form 4868	Due date extends to no later than October 15	No effect
How the extension works	No separate request; check box 1k on Form 3520	Request an extension on Form 7004
Standard fideicomiso fitting the land trust profile	Not required for the property arrangement	Not required for the property arrangement

If you only remember one line from this section, make it this: your personal extension covers Form 3520, but only Form 7004 covers Form 3520-A.

Catching Up If You Missed Something

Many readers come to this topic after the fact. They realise a foreign trust they belong to was never reported, or a large inheritance from a Mexican relative arrived a few years ago and nobody mentioned Form 3520. That sinking feeling is common, and it is not the end of the world. The IRS has procedures for taxpayers who come forward voluntarily, and outcomes for people who act before the IRS contacts them are usually far better than for those who wait.

The right path depends on what was missed and why. Someone who simply did not know about a filing requirement is in a very different position from someone who deliberately hid assets. For non-willful expats who fell behind on US returns or international forms, the streamlined procedures are often the most practical route. They are covered in Streamlined Filing Procedures: Catching Up on Missed US Returns From Mexico. Penalty relief for late information returns can also sometimes be requested based on reasonable cause, but it has to be presented carefully.

Do not file a pile of late forms on your own without a strategy. Late international information returns submitted in the wrong way can trigger automatic penalties that are hard to reverse. Catch-up filings are exactly where an expat specialist like Taxes for Expats is worth the engagement: the order of filings, the explanation statements, and the choice of procedure all affect the result.

Getting It Right With Taxes for Expats

I have tried to give you a clear picture so you can walk into a conversation with a preparer understanding your own situation. I will also be honest about why I lean on professionals for this. Fideicomiso contracts are in Spanish, the IRS guidance turns on substance over labels, and the penalty structure for international information returns does not forgive guesswork. For most Mexico-based Americans with property, foreign family ties, or both, working with a firm that specialises in US expat returns is the sensible choice. Taxes for Expats is a strong fit for this because Americans abroad are its focus, not a sideline.

What a Proper Fideicomiso Review Looks Like

A useful review is more than a preparer saying “fideicomisos are fine, don’t worry.” It should involve reading your trust contract and identifying the clauses that matter: who holds what rights, what the bank may and may not do, what assets the trust holds, and what happens on your death. It should also cover anything added since signing, such as amendments, new substitute beneficiaries, or changes to how rental income flows.

From there, the preparer should reach a clear conclusion about whether your arrangement fits the land trust profile, and ideally put it in writing so it sits in your tax file. If the arrangement fits, your return treats you as the direct owner and the work moves to rental reporting, depreciation, and eventually the sale. If it does not fit, the preparer should explain what Form 3520 and Form 3520-A involve for you and help you meet the deadlines described above.

A good review also looks beyond the trust. It checks for Mexican bank accounts that belong on an FBAR, foreign gifts or inheritances that belong on Form 3520, and Mexican taxes paid that may be creditable. If you want a broader inventory of what an American in Mexico might file in a given year, see US Tax Forms for Americans in Mexico: A Complete Filing Checklist. Taxes for Expats can work through that full list with you, so the fideicomiso question is answered in the context of everything else on your return.

A Step-by-Step Plan for Fideicomiso Owners

Whether you bought last month or a decade ago, this sequence will get you organised. I follow it each year before tax season.

1. Find your fideicomiso contract and any amendments, and keep both the Spanish original and any translation you have in one folder.
2. Write down what the trust holds today. If the answer is “my property and nothing else,” note that. If it holds cash, investments, or other assets, flag it.
3. Check how your rental income flows, if you rent. Make sure proceeds go to an account in your own name, not into an account the trust administers, unless your preparer has reviewed that arrangement.
4. Review any estate planning layers, such as a US revocable trust named as beneficiary or discretionary terms after your death, and list them for your preparer.
5. Gather your purchase records, including the closing statement and the dollar amount you paid, since you will need them for depreciation and eventually for your gain calculation. The way money moved at purchase matters here, as described in Funding a Fideicomiso: How the Money Actually Moves at Closing.
6. List every Mexican and other foreign bank account you own or can sign on, with the highest balance during the year, for FBAR and possible Form 8938 purposes.
7. Write down any gifts or inheritances you received from foreign persons, estates, or trusts during the year, including dates and amounts.
8. Book a review with an expat-focused preparer such as Taxes for Expats, share the folder, and ask for a written conclusion on the fideicomiso question.
9. If any foreign trust reporting applies, put March 15 on your calendar for Form 3520-A or file Form 7004 in time, and plan Form 3520 around your 1040 deadline, using box 1k if you are on extension.
10. Keep the annual bank fee receipts and your trust correspondence with your tax records. The fees are a running cost of ownership, covered in How Much Does a Fideicomiso Cost per Year?, and they may be relevant if the property is rented.

This takes an afternoon the first time and much less in later years, because most of it carries forward unchanged.

Why Specialist Help Beats Guesswork

I have watched friends try to handle this alone. One spent a weekend reading forum threads, decided his completely standard fideicomiso needed full foreign trust reporting, and filed Form 3520 and a substitute Form 3520-A for three years. He then had to unwind it all, which was stressful and expensive. Another assumed that because her condo was fine, she had nothing international to report, and overlooked a large inheritance from her late Mexican husband’s estate that clearly belonged on Form 3520. Both were intelligent, careful people. Neither had the context to see the whole picture.

The value of a specialist is not just knowing the rules. It is knowing which questions to ask about your life: who sent you money, what your trust contract says, where your rent goes, what your estate plan looks like. A preparer used to domestic returns may never ask those questions. A firm built around Americans living abroad asks them as a matter of routine.

If you own property in Mexico through a fideicomiso, or you suspect you have Form 3520 exposure from gifts or trusts, contact Taxes for Expats before your next filing deadline. Ask them to review your trust contract, confirm whether it fits the land trust treatment, check for gift and account reporting you might have missed, and set up a filing plan that keeps you compliant without overfiling. It is the most direct way to turn the dinner-party anxiety into a clear, documented answer you can rely on every year you own your place in Mexico.

Disclaimer

This article is for general informational purposes only and does not constitute professional advice. Laws, prices and regulations vary by location and change over time. Consult a qualified professional for guidance on your specific situation.