You and Your Spouse Own a Foreign Company Together—Who Has to File Form 5471?

Imagine you and your spouse own a company in Mexico together. You file one joint U.S. tax return, so you assume one Form 5471 should cover both of you. Unfortunately, international tax reporting does not always work that way.

Imagine this.

You and your wife own a successful company in Mexico. You own 60%. Your wife owns the remaining 40%. You both live in Texas and file a joint Form 1040.

The company operates entirely in Mexico. It has Mexican employees, customers, bank accounts, and a Mexican accountant who handles the company's books and tax filings.

When tax season arrives, you provide the company's financial information to your U.S. CPA. You know Form 5471 may be required, but because you and your spouse file one joint Form 1040, you assume: “We're married and filing jointly. Just attach one Form 5471.”

Not necessarily.

Your Form 1040 filing status and your individual ownership and international information-reporting obligations are related, but they are not the same thing. Depending on the ownership structure, filing categories, attribution rules, and applicable exceptions, your CPA may need to separately analyze the Form 5471 requirements for each spouse.

Start With the Shareholder Register

Before worrying about tax forms, start with something simpler: who legally owns the company?

Imagine the Mexican shareholder records say Husband — 60% and Wife — 40%. That is different from Husband — 100%, Wife — 0%, and different again from a 50/50 ownership structure.

The fact that a couple is married does not mean we should ignore the actual ownership records. We want to know who owns the shares, how many shares each person owns, when they acquired them, and whether ownership changed during the year.

“But We File a Joint Tax Return.”

When a married couple files jointly, both spouses' income and deductions are generally reported together on one Form 1040. It is natural to think that one tax return means one international filing requirement.

International information reporting can be more complicated. Form 5471 filing requirements are generally determined by looking at the relationship between a U.S. person and a foreign corporation.

Your CPA therefore needs to analyze the husband's potential filing requirement and the wife's potential filing requirement. Only after that analysis can the proper filing mechanics and any applicable duplicate-reporting relief be considered.

Do not assume that filing jointly automatically combines two shareholders into one shareholder for international tax purposes.

Why Ownership Percentages Matter

Consider several examples.

Example 1: Husband owns 100% and wife owns no shares directly. Even then, attribution rules may need to be considered.

Example 2: Husband owns 60% and wife owns 40%. Both spouses directly own shares, so each spouse's ownership is part of the analysis.

Example 3: Husband owns 50% and wife owns 50%. Neither individually owns more than 50% directly. That does not automatically answer the CFC question because attribution rules can matter.

Example 4: Husband owns 9% and wife owns 91%. The husband might look only at his 9% and assume he is below an important threshold. Again, the complete ownership and attribution analysis may tell a different story.

The percentages are the beginning of the analysis—not always the end.

What Is Constructive Ownership?

Most business owners understand direct ownership. If your name is on 600 of the company's 1,000 shares, you directly own 60%.

Constructive ownership is different. Under certain tax rules, ownership held by another person or entity can be attributed to you for particular purposes. Family relationships and ownership through partnerships, corporations, trusts, and other entities can matter.

This is why a husband cannot always look only at the shares registered in his name, and the wife cannot always look only at hers. Your CPA may need to understand the entire family and entity ownership chart.

Why the 10% Threshold Gets So Much Attention

For several international tax provisions involving foreign corporations, 10% ownership is an important threshold. That does not mean every person who owns 10% automatically has exactly the same filing obligation because Form 5471 has multiple filing categories.

But once a U.S. person owns a meaningful percentage of a foreign corporation, the situation deserves careful review.

Imagine a husband owns 7% directly, his wife owns 43%, and a foreign business partner owns 50%. The husband's statement that he “only owns 7%” may be accurate regarding direct ownership, but it may not complete the U.S. tax analysis.

Now Add the Controlled Foreign Corporation Rules

Return to our original couple: husband owns 60%, wife owns 40%, and both are U.S. persons. Together, U.S. ownership is 100%.

This should immediately raise the question of whether the Mexican corporation is a Controlled Foreign Corporation, or CFC.

A CFC is a U.S. tax classification. Generally speaking, a foreign corporation can become a CFC when more than 50% of its stock—measured under applicable voting power or value rules—is owned by qualifying U.S. shareholders under applicable ownership rules.

Once CFC status exists, the analysis can expand beyond Form 5471 to Subpart F income, GILTI, foreign taxes, previously taxed earnings, distributions, related-party transactions, and other international tax items.

Both Spouses May Have Their Own Filing Categories to Analyze

Form 5471 is divided into filing categories. The applicable category depends on the person's relationship with the foreign corporation and events that occurred during the year.

The analysis may consider whether a U.S. person acquired or disposed of stock, reached certain ownership levels, controlled the foreign corporation, was a U.S. shareholder of a CFC, or had another relationship described by the applicable rules.

The husband and wife may not necessarily fall into identical categories merely because they are married. One spouse may have acquired shares during the year while the other owned shares for years. Ownership percentages can increase or decrease, shares can be redeemed, or transfers can occur.

Each event can matter.

Imagine the Wife Inherits Her 40%

Suppose the husband has owned 60% of the Mexican company for years. The wife's father owned the remaining 40%, then passes away and the wife inherits his shares.

Now the couple owns 100% together. From the family's perspective, the business simply stayed within the family. From a U.S. tax perspective, several questions arise.

Did the wife have a Form 5471 filing requirement because she acquired the shares? Does the inheritance itself create a separate foreign gift or bequest reporting issue? Does the company's CFC status change? Do attribution rules affect either spouse? What is the wife's basis in the inherited shares?

One ownership change can create several different international tax questions.

What If One Spouse Is Not a U.S. Person?

Now imagine the husband is a U.S. citizen living in Texas, while the wife is a Mexican citizen who is not a U.S. tax resident. Husband owns 40% and wife owns 60%.

Can the husband simply say, “The majority owner isn't American, so the company isn't controlled by U.S. persons”? Maybe—but do not jump to that conclusion without analyzing the applicable ownership and attribution rules.

International tax attribution rules involving foreign family members can be technical, and the rules have changed over time. The exact facts and tax year matter.

This is why foreign-company ownership should be reviewed annually rather than relying on a rule someone remembers from several years ago.

What If Both Spouses Are U.S. Residents but the Company Is in Mexico?

This is extremely common in border communities. A couple may live in Texas but own a company in Nuevo Laredo, Monterrey, Saltillo, or another Mexican city.

They may think of the business as completely Mexican—and operationally it may be. But if both shareholders are U.S. tax residents, their ownership can bring the company into the U.S. international reporting system.

The company does not need a U.S. office, U.S. employees, or U.S. customers. The money does not necessarily need to come into the United States. The owners' U.S. tax status can be enough to make the foreign company relevant.

“The Mexican Accountant Files Everything for Us.”

That's good—but the Mexican accountant and U.S. CPA are solving different problems.

The Mexican accountant may handle Mexican income taxes, payroll, financial statements, VAT, local compliance, and corporate records.

Your U.S. CPA may need those records to determine Form 5471 reporting, CFC status, GILTI, Subpart F, foreign tax credits, FBAR, Form 8938, and other international information reporting.

The two professionals should ideally communicate. A Mexican tax return does not replace Form 5471, and Form 5471 does not replace the Mexican tax return.

What Financial Information Is Needed?

Once Form 5471 is required, your CPA may need substantially more information than your ownership percentage.

Depending on the applicable schedules, this may include an income statement, balance sheet, trial balance, general ledger, foreign tax return, foreign income taxes, fixed assets, shareholder equity, dividends, shareholder loans, intercompany balances, related-party transactions, capital contributions, ownership changes, and previously taxed earnings.

The company may maintain its books entirely in Mexican pesos. Amounts may then need to be translated into U.S. dollars under applicable rules for U.S. reporting.

This is why foreign-company returns often require coordination well before the Form 1040 deadline.

Related-Party Transactions Become Especially Important

Imagine the husband owns a U.S. transportation company while the husband and wife also own the Mexican company.

During the year, the U.S. company pays the Mexican company, the Mexican company pays the U.S. company, one company loans money to the other, the husband personally advances money to Mexico, the Mexican company pays a personal expense, or the U.S. company purchases equipment from the Mexican company.

These transactions can have international reporting consequences.

When the same family owns companies on both sides of the border, the organizational chart and flow of money become extremely important. Your CPA needs to understand not only who owns the companies, but also how the companies interact.

What About GILTI When Both Spouses Own the Company?

Imagine the Mexican company earns $1 million and no dividends are paid. The couple leaves all the cash inside the company.

Does that mean there is no U.S. income because neither spouse received cash? Not necessarily.

If the corporation is a CFC and the spouses are qualifying U.S. shareholders, the company's earnings may need to be analyzed under GILTI and other CFC rules. The allocation and reporting need to follow applicable ownership and international tax rules.

A 60/40 company should not simply be treated as “the couple owns 100%” when a particular calculation requires us to know which spouse owns what.

What About a Section 962 Election?

For individual U.S. shareholders of CFCs, a Section 962 election can sometimes become an important planning consideration.

If both spouses own shares, the analysis can become more detailed. Your CPA needs to understand the ownership, CFC income, foreign taxes, and how the election would affect the current-year U.S. tax result and future distributions.

A Section 962 election should not be made simply because someone heard that it “reduces GILTI tax.” The entire picture needs to be modeled.

“Can We Just Put Everything Under One Spouse?”

Business owners sometimes ask whether they can simplify U.S. reporting by treating one spouse as the owner.

The answer begins with: Who actually owns the shares?

If the Mexican corporate records show husband owns 60% and wife owns 40%, U.S. reporting should start from the actual facts. Tax reporting is not simplified by pretending ownership is different from reality.

If the family wants to change the ownership structure, that is a separate planning conversation. Transferring foreign-company shares between spouses can itself require tax analysis before anything is changed.

Do Not Change Ownership Just to Make the Tax Return Easier

Imagine someone says, “Form 5471 is complicated. Let's transfer all the shares to my wife.”

That is changing ownership of a valuable business without first understanding the consequences.

Before transferring foreign-company shares, you may need to consider U.S. and Mexican tax consequences, gift rules, basis, future sale consequences, estate planning, control, corporate governance, CFC status, GILTI, information reporting, and legal considerations in both countries.

The tax form should follow the business structure. The business structure should not be changed casually just to make a tax form look simpler.

What If the Couple Gets Divorced?

Imagine a husband and wife each own 50% of a Mexican company. Years later, they divorce, and as part of the property settlement the husband receives 100% of the company.

Now ownership has changed dramatically. Even if a transfer receives special treatment under domestic tax rules, foreign corporation reporting still needs to be reviewed.

Form 5471 categories may change, CFC ownership changes, future GILTI allocations change, and shareholder records need to match reality.

International tax should be part of the conversation when major life events affect foreign-company ownership.

What Happens When One Spouse Dies?

Suppose husband and wife own the company 60/40 and the husband passes away. His 60% interest transfers under his estate plan.

Maybe the wife inherits it. Maybe the children inherit it. Maybe a trust becomes the owner.

The foreign corporation now has a different ownership structure. This can affect Form 5471 reporting, attribution, CFC status, basis, estate planning, and future distributions.

Foreign-company ownership is not a one-time tax question. It can evolve with the family.

Keep the Ownership Records Clean

For family-owned foreign companies, one of the best things you can do is maintain clear records.

Your U.S. CPA should be able to determine who owns each share, when and how each shareholder acquired the shares, each ownership percentage, transfers during the year, whether any shareholder became or ceased to be a U.S. person, dividends, capital contributions, and shareholder loans.

Good records make international compliance significantly easier.

Don't Wait Until April to Figure This Out

Imagine your CPA receives an email on April 10: “By the way, my wife and I own a company in Mexico. Do you need anything?”

Yes. Potentially quite a lot.

Form 5471 preparation can require detailed foreign financial information. If the company has complicated transactions, multiple shareholders, CFC issues, GILTI calculations, or historical reporting problems, the work can become substantial.

For taxpayers with foreign companies, this information should ideally be gathered well before the individual tax filing deadline.

The Question Is Not “Do We File Jointly?”

The better questions are: Who owns the foreign company? What percentage does each spouse own? How did each spouse acquire the shares? Are both spouses U.S. persons? What ownership may be attributed under applicable rules? Is the company a CFC? Which Form 5471 filing categories apply to each person? What happened during the year?

Once those questions are answered, the filing mechanics become much clearer.