Tax Mistakes Foreign Entrepreneurs Make When Opening a Company in the U.S.

Opening a company in the United States is relatively simple.

But structuring it correctly from a tax perspective?

That’s a completely different story.

This is exactly where many foreign entrepreneurs — especially from Brazil — make their most expensive mistakes when entering the U.S. market.

The problem is that these tax mistakes:

• don’t show up at the beginning
• don’t prevent you from opening the company
• don’t stop you from operating

They show up later.

And by the time they do, they’ve already become costly.

The Core Mistake: Treating Tax as a Detail

Most entrepreneurs start with the same mindset:

“I’ll figure this out with an accountant later.”
“Let’s open the company first and adjust as we go.”
“This is just compliance.”

That mindset is the problem.

In the U.S., taxation is not just a legal obligation.

It’s part of your business strategy.

The Most Common Tax Mistakes When Opening a Company in the U.S.

These mistakes follow a clear pattern.

They don’t stop you from starting — but they undermine your efficiency and profitability over time.

The most common ones include:

• ignoring the tax relationship between your home country and the U.S.
• choosing a legal structure without strategic consideration
• misunderstanding core tax concepts
• neglecting compliance obligations even without revenue
• poorly structuring profit distribution
• mixing personal and business finances
• underestimating state-level taxation
• failing to plan for growth

1. Ignoring the Tax Relationship Between Your Home Country and the U.S.

Many entrepreneurs set up a U.S. entity without considering:

• where profits will be taxed
• how distributions will be handled
• the tax residency of shareholders

This often leads to:

• double taxation
• unnecessary tax payments
• inefficient structures
• compliance issues in their home country

You don’t have a standalone U.S. company.
You have an international structure.

2. Assuming an LLC Is Always the Best Option

LLCs have become the default choice — and that’s part of the problem.

Many founders assume:

LLC = best structure

But that’s not always true.

What’s often overlooked:

• how an LLC is taxed in the U.S.
• how it is treated in your home country
• the impact on profit distribution
• additional reporting requirements

In some cases, an LLC can:

• increase your tax burden
• add complexity
• limit future growth

3. Not Understanding “Effectively Connected Income” (ECI)

If your business:

• generates revenue in the U.S.
• has operational presence
• conducts meaningful economic activity

your income may be classified as Effectively Connected Income (ECI).

Many entrepreneurs:

• are unaware of it
• misclassify their income
• fail to report it properly

Which can result in:

• tax exposure
• penalties
• accounting inconsistencies

4. Ignoring Tax Obligations Even Without Revenue

A common assumption:

“I’m not generating revenue yet, so I don’t need to worry.”

That’s incorrect.

Even without revenue, your company may still have:

• reporting obligations
• required filings
• ongoing compliance requirements

Failing to meet these obligations can lead to:

• automatic penalties
• administrative issues
• complications later

5. Poorly Structuring Profit Distribution

Companies generate profits, but fail to plan:

• how funds will be transferred internationally
• the most efficient way to do it
• the tax implications involved

This often leads to:

• double taxation
• reduced margins
• structural inefficiencies

Cross-border profit distribution is not a simple transfer.

It requires planning.

6. Mixing Personal and Business Finances

Very common in early stages:

• using personal accounts for business
• mixing expenses
• lack of clear separation

In the U.S., this can lead to:

• loss of legal protection
• accounting issues
• increased tax risk

7. Underestimating State-Level Taxation

In the U.S., taxation is not only federal.

Each state has its own:

• tax rules
• obligations
• compliance requirements

A common mistake:

opening a company in one state
while operating in another without proper planning

This can result in:

• dual state obligations
• higher costs
• unnecessary complexity

8. Failing to Plan for Growth

The structure that works today may not work tomorrow.

As companies grow, they face:

• tax regime changes
• restructuring needs
• impact on valuation

An inefficient structure at the beginning becomes a limitation later.