FATCA Form 8938 vs FBAR: What Americans in Mexico File and When

Every spring, Americans in Mexico have to decide whether their BBVA account, Nu app, AFORE, and GBM brokerage account belong on FinCEN Form 114 (the FBAR), IRS Form 8938, or both. The two forms overlap, have different thresholds, and go to different agencies, and both carry real penalties. This guide covers which form covers what, when each is due, and how to file both without losing a weekend.

Why Two Forms Exist for the Same Mexican Bank Account

The first time I sat down to report my Mexican accounts, I had a Banorte checking account in Guadalajara, a small savings pocket, and a utility payment card. Then I learned I had to list the same accounts on two different government forms, with different rules, sent to two different places. My reaction was the same as everyone’s: why does the US government need to hear about my grocery money twice?

The answer is that the two forms come from two separate laws, written decades apart for different reasons. Once you understand where each one came from, the overlap starts to make sense, even if it never stops being annoying.

FBAR in Plain English

The FBAR is officially FinCEN Form 114, the Report of Foreign Bank and Financial Accounts. It comes from the Bank Secrecy Act, an anti-money-laundering law. It is not a tax form. You do not file it with your tax return, and the IRS does not receive it directly. It goes electronically to the Financial Crimes Enforcement Network, a bureau of the Treasury Department, through the BSA E-Filing System.

The trigger is simple. If you are a US person and the combined maximum value of all your foreign financial accounts exceeded 10,000 dollars at any point during the calendar year, you must file. “Combined” is the word that matters. Five small Mexican accounts that each stay modest can still cross the line together if one week in March they all happened to be fuller than usual, for example after a rent deposit, a pension transfer, and a tax refund landed close together.

The FBAR also covers accounts you do not own but can sign on. If you are an authorized signer on your Mexican employer’s account, your HOA’s account in a Puerto Vallarta condo building, or your elderly neighbor’s account because you help her pay bills, that signature authority can create a filing obligation even though none of the money is yours.

Form 8938 in Plain English

Form 8938, the Statement of Specified Foreign Financial Assets, comes from the Foreign Account Tax Compliance Act, which everyone calls FATCA. Unlike the FBAR, Form 8938 is a tax form. You attach it to your Form 1040, it goes to the IRS with your return, and it only applies if you are already required to file a federal income tax return.

Form 8938 casts a wider net in terms of asset types. It covers foreign bank and brokerage accounts, and it also covers foreign financial assets held outside an account: shares in a Mexican company you hold directly, an interest in a Mexican partnership, certain foreign-issued insurance and annuity contracts with cash value, and similar holdings. Its thresholds are much higher than the FBAR’s, especially for Americans who qualify as living abroad, so many expats with modest balances never trigger it at all.

FATCA is also the reason your Mexican bank asked whether you were a US citizen when you opened your account. Under FATCA’s bank-side rules, foreign financial institutions report US account holders to the IRS. So the IRS often already has some information about your Mexican accounts before your Form 8938 arrives.

Why the Overlap Feels So Unfair

The overlap is real. A Mexican checking account that is large enough for both forms goes on both forms, and filing one does not excuse you from the other. Filing Form 8938 does not satisfy your FBAR duty, and filing an FBAR does not satisfy your Form 8938 duty. Form 8938 does have a small mercy: it has a section where you indicate that certain assets were already reported elsewhere, but that relief applies to other IRS information forms, not the FBAR.

You are not imagining the frustration. You may have moved to Mexico for a simpler life: tacos at the corner stand, slower mornings, rent that does not consume your paycheck. Then you find out that a few ordinary peso accounts put you into two federal reporting regimes. It is aggravating, but it is manageable once you know the system. This is also why a specialist preparer like Taxes for Expats, which handles both forms as part of an expat return, is worth considering, and we will get to that in detail below.

FBAR vs Form 8938 Side by Side

Before going asset by asset, it helps to see the two forms next to each other. I keep a version of this table taped inside the folder where I store my bank statements.

The Comparison Table

Thresholds and the Living Abroad Advantage

The FBAR threshold is flat. It is the same whether you live in Mérida or Minneapolis, whether you are single or married, and whether you file a tax return or not. Cross 10,000 dollars in combined foreign accounts at any point in the year, and you file.

Form 8938 is more forgiving for people who actually live in Mexico. The instructions set one pair of thresholds for taxpayers living in the United States and a much higher pair for taxpayers living abroad. Each pair has a year-end value test and a highest-value-during-the-year test, and married couples filing jointly get higher figures than single filers. To use the living-abroad figures, your tax home must be outside the US and you must meet either the bona fide residence test or the physical presence test. These are the same tests used for the foreign earned income exclusion; see Form 2555 for Mexico Residents: Bona Fide vs Physical Presence for how each test works day to day.

Here is how that plays out in practice. Rachel teaches online from her apartment in Mexico City’s Roma Norte. She has a BBVA México account for rent and a Nu account for everyday spending, and their combined balance passes 10,000 dollars a few times a year when client payments arrive. She has to file the FBAR. Because she qualifies as living abroad and her Mexican holdings sit well below the living-abroad Form 8938 figures, she does not need Form 8938. Her neighbor Tom, a retired engineer with a large GBM brokerage portfolio and CETES holdings, is above the higher thresholds, so he files both.

Who Counts as a Filer

Both forms apply to US citizens wherever they live, including dual US-Mexican citizens who have never lived in the United States. Green card holders also count. Some Americans born in the US to Mexican parents, who moved to Mexico as children, are surprised to learn they have been “US persons” for reporting purposes their whole lives.

The two forms diverge on who counts beyond individuals. The FBAR applies to US persons broadly, including entities. Form 8938 applies to “specified individuals” and certain domestic entities, and only when a tax return is required. For a retiree in Ajijic whose only income is Social Security below the filing requirement, the FBAR can still be due while Form 8938 is not, simply because no return has to be filed. If you are unsure whether you have to file a return at all, read Do US Expats Living in Mexico Still Need to Pay US Taxes? before worrying about Form 8938.

What Mexican Assets Go on Which Form

Most of the anxiety lives here. Mexico’s financial landscape has changed a lot in recent years: fintech apps, government bond platforms, mandatory retirement accounts. Not every product fits neatly into the categories the US forms were built around.

Bank Accounts, Fintech Apps and Digital Wallets

Traditional Mexican bank accounts are straightforward. A checking or savings account at BBVA México, Banorte, Santander México, HSBC México, or any other Mexican bank is a foreign financial account. It counts toward the FBAR total and, if you are over the thresholds, belongs on Form 8938. Certificates of deposit, often sold as pagarés or fixed-term investments inside your bank app, count too, and you report each one separately if it has its own account number.

Fintech accounts deserve the same attention. A Nu México savings account, a Klar account, or a similar regulated Mexican digital bank is still a Mexican financial account, even if it exists only on your phone. Products that hold your balance in pesos and pay daily yield are deposit or investment accounts in substance. For a breakdown of how these platforms work, see Mexican Fintech and Digital Banks (Nu, Klar, and More).

Digital wallets and multi-currency payment apps are a grayer area, and the answer depends on which legal entity holds your money and whether the product is a financial account under FinCEN’s definitions. I keep a running list of every app holding a balance in my name and let my preparer decide which ones belong on the forms. Over-reporting an account rarely causes harm. Leaving off an account that should have been reported is what causes trouble.

AFOREs, Brokerages, CETES and Investment Funds

If you have ever been formally employed in Mexico, you almost certainly have an AFORE, the individual retirement account funded through payroll. Many Americans forget it exists because they never chose it; the employer and the system set it up. An AFORE is generally treated as a foreign financial account and should be considered for both the FBAR and Form 8938. The broader tax treatment is more complicated, and How the IRS Treats an AFORE: Reporting a Mexican Retirement Account covers the income side in depth.

Mexican brokerage accounts, such as GBM through its app or a casa de bolsa connected to your bank, are foreign financial accounts for both forms. The same goes for CETES held through the government’s direct platform: the account that holds your bonds is a reportable foreign account. For the income reporting that sits alongside the disclosure, see Mexican Brokerage Accounts on Your US Return: Reporting Requirements and CETES and Mexican Government Bonds: US Reporting for a Peso Yield Play.

Mexican mutual funds, the fondos de inversión sold by nearly every bank, raise a separate and more dangerous issue. The account holding them goes on the FBAR and Form 8938 like any other, but the funds themselves are usually treated as passive foreign investment companies under US tax law, which means extra forms and potentially punishing tax treatment. Before you click “invest” in your bank app, read Mexican Investment Funds and PFIC Rules: The Trap Americans Fall Into.

Property, Fideicomisos and Things That Stay Off Both Forms

Real estate you own directly in Mexico is not a financial account. It does not go on the FBAR, and directly held foreign real estate is not reportable on Form 8938 either. Your casita in San Miguel de Allende or your condo in Playa del Carmen can be worth far more than all your bank accounts combined and still appear on neither form. Rental income from that property is a separate matter and must be reported as income.

Coastal and border property bought through a fideicomiso, the Mexican bank trust used in the restricted zone, raises the question of whether the trust is a reportable foreign trust. IRS guidance treats typical fideicomisos used to hold Mexican residential property as outside the foreign trust reporting rules, and a standard fideicomiso holds only the real estate rather than a financial account. Unusual structures exist, though, and you should review your trust deed with a professional. Fideicomiso and Form 3520: Is Your Bank Trust a Foreign Trust? covers the details.

A few other items stay off both forms. Physical pesos in your safe, gold coins in a drawer, jewelry, and your car are not financial accounts. Your US accounts at Schwab, Fidelity, or your hometown credit union are domestic, even if you access them from Mexico, so they are not reported on either form. The question to ask about each item is whether it is a financial account or financial asset held at a foreign institution or issued by a foreign entity.

When to File and How to Calculate Values

Once you know which form applies, you need dates and numbers. This is the part where I used to dig through old bank statements on the night before a deadline.

Deadlines and Extensions for Americans in Mexico

The FBAR is due April 15, and FinCEN grants an automatic extension to October 15. You do not request this extension; it applies to everyone. You also do not need to file a tax return to file an FBAR, and you do not need to file them together.

Form 8938 follows your tax return. Americans whose tax home and abode are outside the US receive an automatic extension to June 15 to file their return, and they can request a further extension to October 15 by filing Form 4868. Form 8938 rides along with whatever deadline your return has. Interest on any tax owed still runs from April 15, which matters if you owe US tax. For the full calendar, including estimated payments, see US Tax Deadlines for Expats in Mexico: Extensions and Estimated Payments.

I file my FBAR well before October, usually in early summer, once my preparer has pulled together the maximum balances. Last-minute FBAR filings are where typos happen: a missing account number, a transposed digit in a CLABE, or a bank listed under its marketing name instead of its legal name.

Finding Your Maximum Balance in Pesos

Both forms ask for the maximum value of each account during the year, not the year-end balance. For a Mexican account, that means finding the highest balance shown on any of your monthly estados de cuenta. A reasonable approximation is acceptable. You do not have to reconstruct every day’s balance, but you do need to look at all twelve statements.

Then you convert pesos to dollars. The standard method for the FBAR is the Treasury Reporting Rates of Exchange, published by the Bureau of the Fiscal Service, using the rate for the last day of the calendar year. You apply that single year-end rate to each account’s peak peso balance, even if the peak happened in February. Form 8938 uses the same Treasury rate by default, and the instructions allow another publicly available rate if you disclose which one you used. Using the same method for both forms keeps your two filings consistent with each other.

Here is a step-by-step process I use:

1. Download all twelve monthly statements for every Mexican account, including fintech apps, the AFORE annual or periodic statement, and brokerage statements.
2. Note the highest balance shown on each account across the year, in pesos.
3. Record the institution’s full legal name, the address of the branch or head office, and the account number exactly as it appears on the statement.
4. Find the Treasury year-end rate for the Mexican peso from the Bureau of the Fiscal Service publication.
5. Convert each peak balance into dollars using that rate and round as the form instructions allow.
6. Add the converted peaks together to check whether you crossed the FBAR trigger, then compare against the Form 8938 thresholds for your filing status and residence.
7. Keep the spreadsheet and statements together with your filed forms for future reference.

Joint Accounts, Spouses and Signature Authority

Joint accounts are handled differently on the two forms, and this is a common source of confusion for married couples. On the FBAR, each US person who co-owns a joint account generally reports the full maximum value, not half. Spouses can file a single joint FBAR in certain situations, such as when all the accounts are jointly owned and a joint tax return is filed. On Form 8938, spouses filing a joint return file one combined Form 8938 and report each joint asset once.

Mixed-nationality marriages add another layer. If you are married to a Mexican national who is not a US person, an account in your spouse’s name alone is not your account and does not go on your forms. If your name is on it, you report it, even if your spouse earns and deposits all the money. Filing status decisions, including whether to treat a non-resident spouse as resident for tax purposes, affect Form 8938 directly; see Married to a Mexican National: Joint vs Separate Filing and the ITIN Process before deciding.

Signature authority is FBAR-only. If you manage the operating account for your Lake Chapala neighborhood association, or you are a signatory on your Mexican employer’s corporate account, that account belongs on your FBAR. Specific exceptions exist for certain officers and employees of regulated or publicly traded entities. It does not go on Form 8938, because you have no financial interest in it.

Penalties, Missed Years and Getting Back on Track

Penalties are the part that keeps people awake at night. Here is a calm account of the actual rules.

What Happens If You Never Filed

FBAR penalties fall into two broad categories. Non-willful violations can draw civil penalties, which are adjusted for inflation over time. The Supreme Court has held that non-willful FBAR penalties apply per annual report, not per individual account, which limits the damage for people with many small accounts. Willful violations are treated far more harshly: the penalty can reach a large share of the account balance, and criminal exposure exists in extreme cases. For a detailed look at the FBAR penalty framework specifically, see FBAR for Mexican Bank Accounts: Thresholds, Timing, and Penalties.

Form 8938 has its own failure-to-file penalty, with additional penalties if you still do not file after the IRS sends a notice. There is also an enhanced accuracy-related penalty on any underpayment of tax connected to undisclosed foreign financial assets. The less obvious consequence is that failing to file Form 8938 can keep the statute of limitations open on your entire return, not only the foreign items, until you file it. An old return you thought was closed can stay exposed indefinitely.

The IRS does not usually pursue ordinary expats with a peso checking account and a small AFORE who simply did not know these forms existed. The enforcement system does distinguish between people who come forward voluntarily and people who are found. Coming forward on your own, with a reasonable explanation, puts you in a much better position.

Streamlined and Delinquent Submission Paths

If you owe nothing but missed only the FBARs, and you filed your tax returns and reported all income, the Delinquent FBAR Submission Procedures may let you file the late FBARs with a statement explaining why they were late. If you missed only information returns such as Form 8938, the Delinquent International Information Return Submission Procedures play a similar role for people who have reasonable cause.

If you missed tax returns, income, and FBARs together, the Streamlined Foreign Offshore Procedures are usually the main path for Americans living abroad whose failure was non-willful. You file a set of back returns and back FBARs, certify that your conduct was non-willful, and for qualifying taxpayers residing abroad the miscellaneous offshore penalty is waived. Streamlined Filing Procedures: Catching Up on Missed US Returns From Mexico walks through the full package.

Choosing among these paths is a judgment call that depends on your facts: whether income was underreported, whether you were outside the US long enough to qualify as residing abroad, and how strong your non-willfulness narrative is. This is where an experienced expat preparer earns their fee. Taxes for Expats regularly prepares Streamlined submissions for Americans in Mexico who discover their filing gaps years later, and the non-willful certification is written as part of the engagement rather than left for you to draft alone.

Why Taxes for Expats Is the Smart Way to File Both

I tried doing this myself for a couple of years. The FBAR itself is not hard to fill in. The difficulty is in the judgment calls: whether a fintech product counts as an account, which threshold applies to your situation, how an AFORE interacts with the rest of your return, and whether a joint account with your Mexican spouse goes on Form 8938 at all. Taxes for Expats is built around exactly these cross-border questions, which is why I recommend it to friends here in Mexico.

What a Specialist Expat Preparer Handles

Taxes for Expats focuses on US citizens and green card holders living abroad, so the FBAR and Form 8938 are routine for them. When you work with them, the foreign account review is part of preparing your return. They look at your Mexican holdings as a whole, decide which items belong on which form, and make sure the FBAR and Form 8938 match each other and match the income reported on your Form 1040. Interest from your Banorte savings account, yield from CETES, and gains from your GBM account should all line up across documents.

They can also file your FBAR for you electronically through the BSA E-Filing System once you sign FinCEN Form 114a, the authorization that lets a third party file on your behalf. That saves you from creating your own filer account and working through an unfamiliar federal interface. For the full list of forms an American in Mexico might face beyond these two, see US Tax Forms for Americans in Mexico: A Complete Filing Checklist.

They are also familiar with how Mexican documents look. A preparer who has seen a thousand BBVA México statements knows where the account number sits, what the legal name of the bank is, and how a CLABE differs from the account number the forms ask for. Pricing at Taxes for Expats depends on the complexity of your return and the number of forms involved, so check their own site for current figures before you book.

A Step-by-Step Filing Workflow With Taxes for Expats

This is the routine I settled into, and it turned an April panic into roughly an afternoon of paperwork:

1. In January, download all twelve monthly statements for every Mexican account, app, AFORE, and brokerage, and save them into one folder labeled by institution.
2. Fill in the intake questionnaire Taxes for Expats provides, listing every account, the institution’s name, and whether anyone else co-owns it or can sign on it.
3. Note any changes during the year: accounts opened or closed, a new Nu savings pocket, signature authority you took on for an HOA or employer.
4. Upload statements and your Mexican tax documents, including any constancia or annual income statements from your Mexican employer or bank.
5. Review the draft return, the Form 8938 if required, and the FBAR list of accounts, checking every account number against your statements.
6. Sign the authorization forms, including Form 8879 for the e-filed return and Form 114a for the FBAR.
7. Save the confirmation of FBAR filing and the IRS acceptance of your return together with your statements for at least six years.

The benefit of this workflow is that you only gather documents once. The same statements support your FBAR, your Form 8938, and the income lines on your return, and one team checks that all three agree.

Choosing Between DIY and Professional Help

Not everyone needs to hire someone. If you have one Mexican checking account that occasionally passes the FBAR trigger, no Form 8938 obligation, simple US income, and no filing gaps, filing the FBAR yourself through the BSA E-Filing System is realistic. It is a long form but not a complicated one, and the instructions are readable.

The case for professional help gets stronger as your situation grows: multiple fintech apps, an AFORE from a former job in Monterrey, a GBM account, a Mexican spouse, a property in a fideicomiso, Mexican mutual funds, or years of missed filings. Each of these adds a judgment call, and each judgment call is a chance to get the US government’s attention for the wrong reasons. In those cases Taxes for Expats gives you a preparer who handles these decisions every season.

Before you move a large sum into a new Mexican product, it is worth asking your preparer how it will be reported. A short question in advance is much cheaper than untangling a PFIC or an unreported account later. For an overview of how these disclosures fit with your Mexican banking setup, see Reporting Mexican Bank Accounts to the IRS: FATCA/FBAR for US Expats.

Living in Mexico is well worth it, but compliance with US reporting rules is part of the deal for Americans here. If you want both forms handled by people who do this every season, so you can get back to your life in Mexico, start with Taxes for Expats and have them review your Mexican accounts before the next deadline.

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.

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