Moving from Mexico to the United States? Review Your Companies and Investments Before You Become a U.S. Tax Resident

Imagine you've spent 25 years building businesses, investments, and wealth in Mexico. Then you move to the United States and discover that assets you've owned for decades can suddenly become part of your U.S. tax and reporting picture.

Imagine this.

You live in Monterrey. You own 60% of a successful Mexican company, several Mexican bank accounts, a brokerage account, two rental properties, an interest in another family business, and perhaps a retirement or investment account.

Everything was established while you lived in Mexico. Everything is properly reported in Mexico. You pay Mexican taxes.

Then an opportunity comes up. Maybe your children live in Texas. Maybe you're expanding your business into the United States. Maybe you're applying for permanent residency. Maybe you simply decide that you want to spend more time in the United States.

You begin preparing for the move. You talk to an immigration attorney, real estate agent, banker, insurance agent, and perhaps a business attorney.

But there is one conversation that should happen before your U.S. tax residency begins: international tax planning.

When you become a U.S. taxpayer, the assets you already own outside the United States do not simply disappear from the picture. In many cases, they become more important.

The Company Didn't Change—You Did

Imagine you own 100% of a Mexican corporation.

Before U.S. residency, the company operates in Mexico. After U.S. residency begins, the same employees, customers, bank accounts, building, and ownership remain.

Nothing changed with the company. But something changed with you.

You may now be subject to a tax system that generally taxes U.S. citizens and U.S. resident aliens on worldwide income and imposes extensive reporting requirements involving foreign assets and entities.

That can completely change the tax analysis.

When Do You Become a U.S. Tax Resident?

People sometimes assume: “I'm not a U.S. citizen, so the U.S. worldwide tax rules don't apply to me.”

That is not necessarily true.

A foreign national can potentially become a U.S. resident for federal income-tax purposes through the green card test, substantial presence test, and other applicable residency rules or elections.

The exact residency starting date can become extremely important.

This is why immigration planning and tax planning should communicate with each other.

Imagine Becoming a Resident Late in the Year

Suppose you own a large Mexican business and become a U.S. tax resident near the end of the year.

You might think: “It's only a few days. I'll worry about the company next year.”

Do not assume that.

Depending on the facts, even a partial year of U.S. tax residency can create international tax and reporting considerations.

The timing of residency, income, dividends, ownership, business transactions, asset sales, and other events can matter.

Start With a Complete Inventory

Before becoming a U.S. taxpayer, create a list of everything you own outside the United States.

That can include foreign corporations, partnership interests, Sociedad Civil interests, S.A. de C.V. shares, S. de R.L. interests, trusts, brokerage accounts, bank accounts, retirement accounts, life insurance with cash value, investment funds, real estate, loans receivable, private investments, family businesses, holding companies, and inherited interests.

Do not decide on your own that something is “not important.” Put it on the list and let your tax professional determine what matters.

Your Mexican Company Should Be Reviewed Before Residency

Imagine you own 70% of an S.A. de C.V.

Once you become a U.S. taxpayer, your CPA may need to determine how the entity is classified for U.S. purposes, whether Form 5471 applies, whether it is a CFC, whether GILTI or Subpart F applies, what foreign taxes it pays, whether the GILTI high-tax exclusion should be considered, whether Section 962 may become relevant, and how future distributions will be treated.

That is a lot to discover after residency has already started.

Why Historical Earnings Matter

Imagine your Mexican company has operated for 30 years and accumulated significant retained earnings.

Your CPA may need to understand what happened before and after U.S. residency began.

Historical financial statements can become extremely valuable. We may want to know the company's accumulated earnings, your basis in the shares, the company's value, foreign taxes paid, distributions before residency, and what happens if earnings are distributed afterward.

Good records can make future international tax calculations much easier.

Should You Take a Dividend Before Moving?

Imagine your Mexican company has $2 million of accumulated cash and you were already considering a distribution.

Should it happen before you become a U.S. tax resident or after?

The answer depends on Mexican tax, U.S. tax, treaty considerations, company earnings, basis, residency starting date, and long-term cash needs.

The answer is not automatically “Take everything out before moving.”

But the timing deserves analysis before the facts are fixed.

Should You Sell an Investment Before Moving?

Imagine you purchased stock for $100,000 and today it is worth $900,000.

You plan to sell it eventually.

Should you sell before moving, after moving, or continue holding?

There is no universal answer.

But do not automatically assume the United States will give every asset a new tax basis equal to fair market value simply because you became a U.S. resident.

Appreciated assets should be reviewed before residency begins.

Basis Is One of the Most Important Pre-Immigration Questions

Imagine you own foreign company shares worth $5 million, Mexican real estate worth $2 million, a stock portfolio worth $1 million, and a family investment worth $500,000.

What is your U.S. tax basis in each asset? Do you have documentation? Were the assets purchased, inherited, gifted, improved, or reorganized?

Years later, reconstructing basis can be extremely difficult.

Pre-immigration planning is an opportunity to organize those records while they are still available.

Consider Obtaining Valuations

Suppose you own 60% of a private Mexican company with no public stock price.

Having a contemporaneous valuation can become useful for future planning, estate considerations, transactions, and documentation.

The same can apply to private companies, real estate, partnership interests, and other difficult-to-value assets.

Do not wait 15 years and then try to determine what the business was worth when you moved.

What About Your Mexican Bank Accounts?

You may have had the same Mexican bank account for 20 years.

Once you become a U.S. person for FBAR purposes, foreign account reporting may become relevant.

Generally, an FBAR filing requirement can arise when a U.S. person has a financial interest in or signature authority over qualifying foreign financial accounts and the aggregate value exceeds $10,000 at any time during the calendar year, subject to applicable rules and exceptions.

The account does not need to be new and the money does not need to move to the United States. Your U.S. status is what changed.

Don't Forget Signature Authority

Imagine you own a Mexican company and are authorized to sign on its operating account.

The account belongs to the corporation—not you personally.

That does not automatically mean you can ignore it.

FBAR rules can involve both financial interest and certain signature authority.

Your CPA needs to understand not only your personal foreign accounts but also accounts over which you have authority.

What About Form 8938?

FBAR is not the only foreign financial asset reporting regime.

Form 8938 may also apply to specified foreign financial assets when applicable thresholds are met.

The thresholds depend on factors such as filing status, whether the taxpayer lives in the United States or abroad, and the type and value of foreign financial assets.

Form 8938 and FBAR are separate. Filing one does not automatically satisfy the other.

What About Your Mexican Brokerage Account?

Imagine you own a portfolio at a Mexican financial institution containing individual stocks, bonds, mutual funds, investment funds, and other pooled investments.

Once you become a U.S. taxpayer, the account itself can create reporting considerations.

But the investments inside the account can create additional tax issues.

This is especially important with foreign mutual funds and similar foreign investment companies.

The PFIC Problem

One of the most important pre-immigration issues is the Passive Foreign Investment Company, or PFIC, regime.

Many foreign investment funds can potentially fall within PFIC rules.

A Mexican mutual fund that feels completely ordinary in Mexico may receive much more complicated U.S. tax treatment after you become a U.S. taxpayer.

PFIC rules can involve Form 8621, special tax calculations, interest charges, elections, and complicated historical information.

This is exactly the type of asset you want identified before U.S. residency begins.

“It's Just a Mutual Fund” Can Be a Big Problem

Suppose your Mexican investment adviser built a diversified portfolio containing 15 foreign funds.

Now imagine discovering after becoming a U.S. taxpayer that each fund needs to be analyzed separately for PFIC purposes.

Before moving, obtain a complete investment statement and identify exactly what you own.

Do not simply tell your U.S. CPA: “I have a brokerage account in Mexico worth $1 million.”

We may need to know what is inside it.

What About Mexican Retirement Accounts?

Foreign retirement and pension arrangements can be complicated.

Do not automatically assume: “It's a retirement account in Mexico, so the U.S. treats it exactly like an IRA or 401(k).”

The treatment can depend on the specific arrangement, contributions, employer involvement, income earned inside the account, distributions, treaty provisions, foreign trust considerations, and information reporting.

Before becoming a U.S. taxpayer, identify every retirement or pension arrangement you have.

What About a Foreign Trust?

Imagine your family created a Mexican or other foreign trust years ago that owns real estate, company shares, investment accounts, or family assets.

Once you become a U.S. taxpayer, your relationship with the trust may create U.S. reporting issues.

Forms such as Form 3520 and potentially Form 3520-A can become relevant depending on the structure and your relationship with the trust.

Foreign trust reporting can be extremely complicated and carries significant penalties when required forms are missed.

What If You Expect a Large Foreign Gift or Inheritance?

Suppose your parents live in Mexico and plan to give you significant money or property, or you expect to inherit part of a family company.

The timing relative to your U.S. tax status can matter for reporting and planning.

Certain large gifts or bequests received by U.S. persons from foreign persons can create Form 3520 reporting requirements.

That does not automatically mean the gift or inheritance is U.S. taxable income.

Non-taxable does not always mean non-reportable.

What About Mexican Real Estate?

Imagine you personally own a home in Monterrey, a rental property in Cancún, commercial land, or a warehouse.

Income from foreign rental property can become relevant to your U.S. tax return once you are a U.S. taxpayer.

If you later sell foreign real estate while subject to U.S. taxation, the gain may also need to be considered for U.S. purposes.

That is why basis and historical documentation matter.

Foreign Real Estate Owned Through a Company Is Different

Suppose the real estate is owned through a Mexican corporation or partnership rather than personally.

Now there are two layers: the property and the foreign entity.

The U.S. reporting may involve the entity rather than simply treating the property as directly owned real estate.

This is why an organizational chart should be part of pre-immigration planning.

What About Life Insurance?

Foreign life insurance and investment-oriented insurance products can have U.S. tax consequences that differ from what the owner expects.

Some foreign policies contain significant cash value or investment components.

Before residency, identify the insurance company, policy type, cash value, investment component, premium history, ownership, and beneficiaries so your tax professional can determine whether additional analysis is needed.

What About Your Family Holding Company?

Imagine your family owns several businesses through a Mexican holding company and you own 25%.

Your siblings own the rest.

Once you become a U.S. taxpayer, your CPA may need to understand the holding company, subsidiaries, direct and indirect ownership, which family members are U.S. persons, underlying businesses, foreign taxes, distributions, and related-party transactions.

One 25% holding-company interest can connect you to several foreign corporations for U.S. international tax purposes.

Draw the Organizational Chart Before You Move

Put yourself at the top and draw every entity underneath you.

Then separately list bank accounts, brokerage accounts, trusts, real estate, retirement arrangements, and other significant foreign assets.

Now your CPA can actually see the international structure.

This is much better than discovering one foreign asset at a time during tax preparation.

Pre-Immigration Planning Is Not About Hiding Assets

The objective is the opposite.

The goal is to understand what you own and how the U.S. tax system will treat it before you enter that system.

Good planning means proper reporting, understanding future tax costs, maintaining documentation, evaluating legitimate elections, avoiding unnecessary surprises, and making informed business decisions.

International tax planning should be about compliance and foresight.

Don't Restructure Everything Just Because You're Moving

After reading about CFCs, GILTI, PFICs, and foreign trusts, someone may think: “I need to sell everything before I move.”

Not necessarily.

Restructuring can itself create Mexican tax, U.S. tax, legal consequences, control issues, estate planning problems, business disruption, and transaction costs.

The purpose of pre-immigration planning is not to create panic. It is to model the alternatives.

Sometimes the best answer may be to change something. Sometimes the best answer may be to leave the structure exactly as it is and prepare for the U.S. reporting.

Work With Your Immigration Attorney and CPA Together

Immigration decisions can create tax consequences, and tax decisions can affect immigration planning.

Your immigration attorney determines the appropriate immigration strategy. Your international tax CPA analyzes the tax consequences.

Ideally, those conversations happen together before important dates are finalized.

The question should not simply be: “When do I get my green card?”

It should also include: “When does my U.S. tax residency begin, and what happens to my worldwide assets when it does?”

What Should You Bring to a Pre-Immigration Tax Meeting?

Ideally, bring a complete financial picture.

That may include foreign company organizational documents, ownership percentages, financial statements, foreign tax returns, bank statements, brokerage statements, investment lists, retirement accounts, trust documents, real estate information, purchase dates and cost basis, loan information, life insurance, expected gifts or inheritances, planned asset sales, expected dividends, and your immigration timeline.

The more complete the information, the more useful the planning can be.

Six Months Before Moving Is Better Than Six Months After

Imagine two taxpayers.

Taxpayer A meets with an international tax CPA six months before becoming a U.S. resident. Foreign companies are reviewed, PFICs are identified, basis records are gathered, potential dividends are modeled, foreign accounts are documented, and the residency date is understood.

Taxpayer B moves first. A year later, during tax preparation, the CPA asks: “Do you own anything outside the United States?”

The answer is: “Yes. A lot.”

Now everyone is working backward.

The difference can be enormous.