5 Mistakes Foreign Founders Make When Setting Up in the US

5 Mistakes Foreign Founders Make When Setting Up in the US

By Blitzer Finance | May 2026 | Category: Start-Up, Standards & Regulations

Setting up a US business as a foreign national has never been more accessible. But accessibility does not mean simplicity — and the gap between “getting it done” and “getting it done right” can cost you tens of thousands of dollars, months of lost time, and in some cases, the business itself.

At Blitzer Finance, we work with Turkish and international entrepreneurs every day who are building US companies from abroad. We have seen what goes wrong — and more importantly, we know exactly how to prevent it.

Here are the five most common and most costly mistakes foreign founders make when incorporating in the United States.

Estimated reading time: 8 minutes

Mistake #1: Choosing the Wrong Entity for Their Goals

This is the most consequential decision you will make in your US business journey — and it is the one most often made without adequate information.

The two main structures for foreign founders are the LLC (Limited Liability Company) and the C-Corporation. They are fundamentally different tools built for fundamentally different purposes, and choosing the wrong one creates serious problems down the road.

The LLC is excellent for service businesses, e-commerce operations, SaaS companies generating revenue from non-US sources, consulting firms, and holding companies. It offers pass-through taxation, flexible governance, and straightforward compliance. For many foreign-owned businesses, it is the right choice.

The C-Corporation — almost always a Delaware C-Corp — is the required structure for any founder who plans to raise venture capital, issue stock options to employees, or pursue an institutional exit. US investors and VC firms require it. It is the industry standard for a reason: it allows for preferred and common share classes, SAFE notes, and a clean cap table that investors understand.

The mistake founders make is not thinking 18 months ahead. A founder who sets up an LLC today and then tries to raise a Series A in 18 months faces an expensive and time-consuming conversion process. A founder who sets up a Delaware C-Corp to run a simple e-commerce operation pays unnecessary corporate tax, faces more complex compliance, and may create double-taxation problems that erode their margins.

The fix: Before you incorporate, be clear about your 24-month goal. Are you building to raise capital and scale with institutional investment? Form a Delaware C-Corp. Are you building to generate revenue, operate globally, and maintain a lean, efficient structure? An LLC — Wyoming or Delaware — is likely the right answer. Speak with an advisor before you file, not after.

Mistake #2: Ignoring Form 5472 (The $25,000 Mistake)

This is the single most expensive mistake we encounter with foreign-owned US entities — and it is entirely, preventably avoidable.

If you are a non-US person who owns 25% or more of a US LLC — which is essentially every foreign-owned single-member LLC — your company is required to file Form 5472 with the IRS every single year. This is an information return, not a tax return. It does not mean you owe tax. It means the IRS requires visibility into transactions between your US entity and its foreign owner.

The penalty for failing to file Form 5472 is $25,000 per form, per year. Miss it for three years and you are looking at $75,000 in penalties — before any professional fees to resolve the situation.

The IRS significantly increased enforcement of this requirement in recent years, and foreign-owned entities are actively targeted. We have worked with clients who came to us after discovering years of unfiled returns. Resolving this situation is possible, but it is stressful, expensive, and entirely unnecessary if you get your compliance right from year one.

The fix: Hire a qualified accountant before the end of your first tax year — not when you start making money, not when the IRS sends a notice. The cost of proper annual compliance is a fraction of a single missed-filing penalty.

Mistake #3: Mixing Personal and Business Finances

The entire point of forming a US LLC or C-Corporation is to create a legal separation between you as an individual and your business. This separation — the corporate veil — is what protects your personal assets if the business is ever sued, defaults on a debt, or faces a legal dispute. But it has to be maintained.

The fastest way to lose it is to mix your personal and business finances. Paying a personal expense from the business account. Using the business credit card for a personal trip. Depositing a client payment into a personal account because the business account was not set up yet. Each of these actions can give a court reason to disregard the legal separation between you and your company — a doctrine called “piercing the corporate veil.” When that happens, your personal assets become fair game for creditors and litigants.

Beyond the legal risk, commingled finances create a bookkeeping nightmare. Clean financial records are essential for tax compliance, investor due diligence, and loan applications.

The fix: Open your US business bank account as soon as your entity is formed and your EIN is confirmed. All business income goes in. All business expenses come out. Nothing personal touches either. Every transaction should have a clear, documented business purpose.

Mistake #4: Not Having a Proper Operating Agreement

An Operating Agreement is the internal governing document of your LLC. It defines who owns what, who decides what, how profits are distributed, what happens if a member wants to leave, and what happens if a dispute arises between owners.

Many foreign founders skip this entirely, or use a one-page generic template downloaded from the internet. Both are serious mistakes.

Banks require your Operating Agreement when you open a business account. Investors require it during due diligence. If a business relationship deteriorates, a court will look at your Operating Agreement to determine the rights and obligations of each party. If it is vague or simply a template that does not reflect the actual arrangement between the parties, the outcome of that dispute becomes unpredictable.

For founders pursuing the E-2 Treaty Investor Visa, the Operating Agreement is also a critical component of the immigration application — it must clearly demonstrate ownership percentage, investment contribution, and operational control.

The fix: Have a qualified attorney or accountant draft or review your Operating Agreement before it is finalized. It should reflect your actual ownership structure, capital contributions, distribution arrangement, and governance rules. This is a one-time cost that protects you for the life of the company.

Mistake #5: Underestimating the EIN Timeline

The Employer Identification Number is the federal tax identity of your US business. You need it to open a US business bank account, accept payments through Stripe or PayPal, hire US employees, file tax returns, and interact with any US government agency.

US residents with a Social Security Number can apply for an EIN online and receive it instantly. Non-US residents cannot use the online system. As a foreign national, you must either call the IRS International Line (+1-267-941-1099) or submit IRS Form SS-4 by fax. The fax process takes 30 to 45 business days in 2026 — six to nine calendar weeks during which your bank account cannot be opened, your Stripe account cannot be activated, and your business operations are on hold.

Founders who discover this after incorporating frequently face weeks of costly delay at the worst possible time — when they are ready to launch, ready to take their first customer, ready to move.

The fix: Start your EIN application on the exact same day you file your formation documents. The two processes run in parallel, and starting immediately means your EIN arrives around the same time your entity paperwork is confirmed — not weeks later.

The Common Thread: Get Proper Guidance Before You File

Every mistake on this list shares the same root cause: a founder who made an important decision without fully understanding its implications — often to save time or money in the short term.

The cost of professional guidance at the setup stage is measured in hundreds of dollars. The cost of fixing these mistakes after the fact is measured in thousands — or in some cases tens of thousands — of dollars, plus months of operational disruption.

How Blitzer Finance Can Help

At Blitzer Finance, we specialize in helping Turkish and international founders set up their US business correctly from the very beginning. We have built our practice specifically around the challenges that foreign-owned businesses face — challenges that most US accounting firms do not fully understand because most of their clients are US residents.

We help with entity selection, operating agreement support, EIN applications, annual compliance (Form 5472, Form 1065, Form 1120), bookkeeping, and fractional CFO services for scaling businesses.

Ready to Set Up Your US Business the Right Way?

We invite you to schedule a free 30-minute consultation with our team. We will review your situation, identify any gaps, and give you a clear picture of what you need — at no cost and with no obligation.

[Schedule your free consultation →https://blitzerfinance.com/contact/

This article is for informational purposes only and does not constitute legal or tax advice. Please consult a licensed tax professional and immigration attorney for advice specific to your circumstances.