Imagine you give your CPA a complete list of your Mexican bank and investment accounts. Your CPA prepares your FBAR, and you think you're finished. Then you hear: “Now we need to see whether Form 8938 is required.” Your first reaction is probably: “Didn't we just report all of this?”
Imagine this.
You are a U.S. citizen living in Texas with financial ties to Mexico.
You maintain a Mexican checking account, savings account, brokerage account, shares of a Mexican company, and perhaps an interest in another foreign business.
Your CPA asks for the maximum values of your foreign bank accounts. You provide everything.
The CPA tells you: “You need to file an FBAR.”
Fine. The FBAR gets prepared.
Then your CPA asks: “Now let's calculate your Form 8938 threshold.”
You respond: “Wait. Why are we reporting my foreign assets again?”
That is one of the most understandable questions in international tax.
The United States has multiple foreign-asset reporting systems. Two of the most common are FBAR—FinCEN Form 114—and Form 8938—Statement of Specified Foreign Financial Assets.
They overlap, but they are not the same form.
Depending on your circumstances, you may need one, the other, or both.
Start With the Simplest Difference
Think about it this way.
FBAR is primarily focused on certain foreign financial accounts.
Form 8938 can cover a broader category of specified foreign financial assets.
A bank account is a financial account, but not every foreign financial asset is necessarily an account.
For example, directly held stock in a foreign corporation can potentially be relevant to Form 8938 even though there is no foreign bank account holding the shares.
This is why the two forms can produce different answers.
Where Are the Forms Filed?
The FBAR is filed separately and electronically with FinCEN. It is not attached to your Form 1040.
Form 8938, on the other hand, is generally attached to your federal income-tax return when required.
Even though both forms deal with foreign financial information, they live in different filing systems.
One does not automatically replace the other.
Imagine You Have $75,000 in Mexican Bank Accounts
Suppose you live in Texas and have qualifying Mexican bank accounts with aggregate maximum values substantially above $10,000.
An FBAR may be required.
Now we separately ask whether Form 8938 applies.
For Form 8938, reporting thresholds can depend on whether you are married, whether you file jointly, whether you live in the United States or abroad, the value of specified foreign financial assets at year-end, and their maximum value during the year.
The fact that you need an FBAR does not automatically tell us whether you need Form 8938.
We have to run a second test.
The FBAR Threshold Is Much Lower
The FBAR threshold gets attention because it is relatively low.
Generally, the aggregate value of qualifying foreign financial accounts only needs to exceed $10,000 at any time during the calendar year for the filing requirement to potentially arise, subject to applicable rules.
Form 8938 thresholds are generally higher and vary depending on the taxpayer.
Many taxpayers can therefore have an FBAR filing requirement without having a Form 8938 filing requirement.
Imagine a Married Couple Living in Texas
You and your spouse file jointly and have Mexican financial assets.
Your CPA first performs the FBAR analysis.
Then your CPA performs the Form 8938 analysis using the applicable threshold for married taxpayers filing jointly and living in the United States.
These are separate calculations.
Do not assume: “Our accounts exceeded $10,000, so both forms are automatically required.”
And do not assume: “We're below the Form 8938 threshold, so no FBAR is required.”
The thresholds are different.
What If You Live in Mexico?
Form 8938 has different thresholds for certain taxpayers living abroad.
That means two U.S. citizens with identical foreign assets could potentially have different Form 8938 filing results depending on where they live.
Imagine Taxpayer A lives in Laredo and Taxpayer B lives in Monterrey.
Their FBAR analysis may look similar, but applicable Form 8938 thresholds can differ if one qualifies as living abroad under the applicable rules.
This is another reason your CPA needs to know where you actually live.
What Assets Can Appear on Both?
There can be substantial overlap.
A Mexican bank account may potentially be relevant to both FBAR and Form 8938.
A Mexican brokerage account may also potentially appear in both analyses.
So yes, sometimes you really are reporting information about the same foreign account twice.
The forms exist under different statutory reporting regimes.
“Isn't That Duplicate Reporting?”
In practical terms, there can be duplication.
But satisfying one reporting regime does not necessarily satisfy the other.
The correct question is not: “Did I already tell the government about this?”
The correct question is: “Which reporting requirements apply to this asset?”
Foreign Company Shares Show the Difference Clearly
Imagine you directly own 30% of a Mexican corporation.
The shares are registered directly in your name and there is no brokerage account.
From an FBAR perspective, directly held stock is not simply the same thing as having a foreign financial account at a bank.
But Form 8938 can potentially require reporting of certain directly held interests in foreign entities as specified foreign financial assets.
Your ownership may also create Form 5471 reporting.
One foreign company can therefore potentially affect multiple U.S. information returns.
Form 8938 Does Not Replace Form 5471 Either
Imagine your Mexican corporation is properly reported on Form 5471.
You ask: “Why do we need to think about Form 8938? We already reported the company.”
There are coordination rules designed to reduce certain duplicative detailed reporting when specified assets are reported on certain other international information forms.
But that does not mean you can ignore the Form 8938 analysis altogether.
Your CPA should coordinate the forms rather than assume one completely erases the other.
The Same Issue Can Happen With Form 8865
Suppose instead you own a foreign partnership interest.
Form 8865 may apply.
That partnership interest can also be relevant when evaluating Form 8938.
The reporting systems interact.
International tax preparation should not be handled as “prepare each form independently and hope everything matches.”
The forms need to reconcile with one another.
What About Foreign Trusts?
Foreign trust interests and transactions can potentially involve Form 3520, Form 3520-A, Form 8938, and potentially FBAR depending on the accounts and taxpayer's relationship with them.
The exact combination depends on the facts.
A foreign trust is a perfect example of why international reporting requires looking at the complete structure.
What About Mexican Mutual Funds?
Imagine you directly own several Mexican investment funds.
Now we may need to consider Form 8621 for PFIC reporting, Form 8938, FBAR if investments are held through a qualifying foreign financial account, income reporting on Form 1040, and foreign tax credits.
One investment portfolio can therefore produce several different U.S. forms.
Don't Count the Same Asset Twice When Testing Form 8938 Thresholds
If a foreign asset is held inside a foreign financial account, the Form 8938 valuation and reporting rules need to be applied correctly.
You should not simply add the value of the brokerage account plus every stock and fund inside it and automatically assume that total is the correct threshold calculation.
Otherwise, you can accidentally double or triple count the same wealth.
The applicable rules determine what asset or account is being reported and how it is valued.
Imagine a $500,000 Mexican Brokerage Account
Inside the account you have $200,000 of stocks, $200,000 of bonds, and $100,000 of investment funds.
Economically, the account is worth $500,000.
It would make no sense to blindly report a $500,000 account plus another $500,000 of underlying investments and call the total $1 million.
The reporting needs to follow the applicable rules for assets held through financial accounts.
What About Real Estate in Mexico?
Imagine you personally own a vacation home in Cancún.
Physical real estate itself is different from a foreign financial account or specified foreign financial asset.
Now change the structure.
Instead of owning the property directly, you own 100% of a Mexican corporation that owns the property.
Now you own a foreign financial asset: the shares of the foreign corporation.
The entity can therefore create international reporting even though directly owned real estate may be treated differently.
Structure matters.
What About a Foreign Partnership That Owns Real Estate?
You may not directly own the building. You own an interest in a foreign partnership that owns the building.
Your partnership interest is a separate asset.
That can potentially create Form 8865, Form 8938 considerations, foreign income reporting, and other international issues.
We need to know how you own the asset.
What About Mexican Retirement Accounts?
Foreign pension and retirement arrangements can be complicated.
Depending on the specific arrangement, Form 8938 may need to be considered.
FBAR may also potentially apply to certain foreign financial accounts associated with retirement arrangements, subject to applicable rules and exceptions.
Other tax or treaty issues may also exist.
Do not assume: “It's retirement money, so neither form applies.”
What About Life Insurance With Cash Value?
Certain foreign insurance or annuity arrangements with cash value can create international reporting considerations.
If you own a Mexican or other foreign insurance product with an investment or cash-value component, tell your CPA.
Do not simply report: “Life insurance—not taxable.”
The policy may have reporting considerations separate from whether a death benefit is taxable.
Form 8938 Is Connected to Your Income-Tax Return
This creates an important practical difference.
Suppose you are not otherwise required to file a U.S. federal income-tax return.
The Form 8938 analysis can be different because Form 8938 is attached to the income-tax return.
FBAR, however, is a separate filing regime.
This is another reason the two forms should never be treated as identical.
Maximum Value Matters Again
Just like FBAR, Form 8938 can require us to look beyond year-end value.
Applicable filing thresholds can consider value at the end of the tax year and higher values during the year.
Imagine you had $600,000 of foreign financial assets in June, sold most of them, and had $40,000 at December 31.
Your year-end balance alone may not tell us whether Form 8938 is required.
We need the year's full picture.
What If the Account Is Jointly Owned?
Joint ownership can affect how assets are reported and valued under applicable rules.
The answer can depend on whether the joint owner is your spouse, whether you file jointly, whether the other owner is a U.S. person, and the specific reporting regime.
Do not simply divide every joint account by 50% without checking the applicable rules.
What If Your Spouse Owns the Foreign Account?
Imagine you are a U.S. citizen, your spouse is also a U.S. person, and your spouse owns a Mexican account entirely in their name.
You file a joint tax return.
Now both FBAR and Form 8938 need to be analyzed under their respective rules.
Joint income-tax filing does not mean foreign-account reporting automatically becomes simple.
What If Your Spouse Is Not a U.S. Person?
Now imagine your spouse is not a U.S. person.
We need to understand who owns the asset, whether you have a financial interest or signature authority, whether any income-tax residency election applies to the spouse, and how the account is titled.
Marital status alone does not answer the international reporting question.
What Happens If Form 8938 Is Missed?
Form 8938 carries its own penalty regime.
An initial penalty can apply for failure to properly file the form when required, with additional consequences potentially arising in certain circumstances.
There can also be effects on the statute of limitations for the tax return.
This is another reason Form 8938 should not be treated as optional because an FBAR was filed.
What Happens If FBAR Is Missed?
FBAR has a separate penalty regime.
The rules and potential consequences differ from Form 8938.
A taxpayer who was required to file both forms and filed neither can potentially have two separate compliance problems.
Different forms. Different laws. Different penalties.
Imagine Filing One but Forgetting the Other
You properly file FBAR every year and report all foreign interest and dividends, but Form 8938 was required and never attached to Form 1040.
That is different from filing Form 8938 but forgetting FBAR.
The correction strategy can differ because the missing form is different.
Do not simply say: “I reported the accounts somewhere.”
We need to determine exactly which filing requirement was missed.
Your CPA Should Use One Master Foreign-Asset Schedule
Instead of creating a separate list for every form, start with one complete international asset schedule.
For each asset, identify what it is, where it is located, who owns it, maximum value, year-end value, income generated, foreign taxes, account number, financial institution, entity ownership percentage, and whether another international form applies.
Then your CPA can map each asset to FBAR, Form 8938, Form 5471, Form 8865, Form 8621, Form 3520, and other applicable forms.
That is much safer than relying on memory.
A Simple Comparison
Think about the forms this way.
FBAR asks: Do you have qualifying foreign financial accounts that exceed the aggregate reporting threshold?
Form 8938 asks: Do you have specified foreign financial assets exceeding the applicable threshold for your filing and residency situation?
Those questions overlap, but they are not identical.
Why This Matters So Much for U.S.–Mexico Families
A cross-border family may have Mexican checking accounts, brokerage accounts, company shares, Sociedad Civil interests, retirement accounts, trusts, investment funds, jointly owned accounts, and business accounts.
Someone who only asks: “Do you have more than $10,000 in Mexico?” is not asking enough questions.
We need the complete international financial picture.
Don't Decide Which Form You Need Yourself
You do not need to memorize FBAR regulations or Form 8938 thresholds.
Your responsibility is much simpler: tell your CPA what you own.
Then your CPA determines which reporting regimes apply.
Problems often start when the taxpayer decides: “I already reported that somewhere, so I don't need to mention it again.”
Mention it. Let your CPA decide.
FBAR and Form 8938 can feel repetitive because some foreign accounts may need to be considered under both sets of rules.
The easiest way to handle it is simple: give your CPA one complete list of everything you own outside the United States.
Don't worry about deciding whether something belongs on FBAR, Form 8938, Form 5471, or another international form yourself. Once we understand the complete picture, we can determine where everything belongs.
