*US Expansion Series — Part 3 of 3: Pitfalls to Avoid*
Parts 1 and 2 of this series covered what the US tax system expects from foreign businesses and how to set up your US entity correctly. This final installment is different — it's built from what we've seen go wrong in practice.
The mistakes below aren't theoretical. They're patterns we encounter repeatedly when foreign-owned businesses come to us after the fact: usually when a penalty notice arrives, an audit begins, or a deal falls apart during due diligence. Most of them are entirely avoidable with the right guidance upfront.
Mistake 1: Treating the US as One Market
The US is 50 different regulatory environments operating under one federal layer. A business that's fully compliant in its home country can unknowingly have tax obligations across a dozen US states simply by selling online, storing inventory in a fulfillment center, or employing one remote worker.
The mistake isn't just about sales tax (though that's the most common flashpoint). It's the assumption that federal compliance is sufficient. It isn't. Each state where you have economic nexus, employees, or property can assert independent taxing and reporting jurisdiction - and most states have no obligation to notify you that you've crossed a threshold. You're expected to know.
What to do instead: Before you make your first US sale or hire your first US employee, map your expected state-by-state footprint. Understand where nexus will be triggered and register proactively. The cost of registration is minimal. The cost of back taxes, interest, and penalties after the fact is not.
Mistake 2: Choosing the Wrong Entity Type for Long-Term Goals
The entity type that minimizes your tax bill today may create significant friction two years from now. This is one of the most consequential early decisions foreign businesses make - and one of the hardest to reverse cleanly.
Common mismatches:
- Forming an LLC when you plan to raise venture capital: Most US VCs will not invest in an LLC. They require a Delaware C-Corporation with a clean cap table and standard investor rights. Converting an LLC to a C-Corp is possible but creates a taxable event and administrative complexity that slows deals down at the worst possible time.
- Forming a C-Corp when you don't need to: C-Corps face double taxation — once at the corporate level, again when profits are distributed as dividends. For a foreign owner who wants to extract profits efficiently, a C-Corp structure without a tax treaty advantage can be surprisingly expensive.
- Ignoring treaty benefits: The US has tax treaties with over 60 countries. These treaties can reduce withholding rates on dividends, royalties, and interest paid from the US entity to the foreign parent — sometimes to zero. If your home country has a treaty with the US and you're not structured to take advantage of it, you may be over-withholding unnecessarily.
What to do instead: Make the entity type decision with full visibility into your three-to-five-year plan — funding strategy, exit strategy, and profit distribution strategy - before you file anything.
Mistake 3: Missing Disclosure Forms (and Paying Automatic Penalties)
The US tax system has a category of filings that are purely informational - they don't calculate or collect tax, they just require disclosure. Missing them doesn't mean you owe more tax. It means you owe automatic, non-discretionary penalties that the IRS imposes without needing to prove any harm.
The most common ones foreign-owned businesses miss:
- Form 5472: Required for foreign-owned US disregarded entities and 25% foreign-owned corporations. Covers transactions with the foreign parent - loans, services, IP licenses. Penalty: $25,000 per form, per year, starting from the date it was due. The IRS has been aggressively enforcing this since 2017.
- FinCEN 114 (FBAR): Required if your US entity has signatory authority or financial interest in foreign bank accounts exceeding $10,000 at any point during the year. Penalty for willful non-filing: the greater of $100,000 or 50% of the account balance per year.
- Form 8938 (FATCA): Similar to FBAR but filed with the tax return. Higher thresholds, but the penalties for non-filing are substantial.
- Form 926: Required when a US person (including a US entity) transfers property to a foreign corporation. Often triggered by intercompany asset transfers that don't seem like a major event at the time.
What to do instead: Build a compliance calendar at the start of each year that includes all informational filings — not just tax returns. Your CPA should be flagging these proactively, not reactively.
Mistake 4: Misclassifying Workers
The independent contractor vs. employee distinction is one of the IRS's most-audited areas - and the consequences of getting it wrong extend beyond federal tax to state labor law, benefits obligations, and immigration compliance.
The general rule: if you control what work is done and how it is done, the person is an employee. A contract that says "independent contractor" doesn't override the economic reality of the relationship. The IRS, the Department of Labor, and most state agencies apply multi-factor tests that look at behavioral control, financial control, and the nature of the relationship — not just what the agreement says.
For foreign-owned businesses, this mistake is especially common when transferring staff from the parent company to support US operations. The person doing the same job they did at the parent entity - but now doing it for the US subsidiary - is almost certainly a US employee, with all the payroll, benefits, and compliance obligations that come with that status.
What to do instead: Before classifying anyone as a contractor, run the IRS's common law test. When in doubt, classify as an employee. The cost of proper payroll administration is far less than the cost of reclassification penalties, back payroll taxes, and state labor board enforcement actions.
Mistake 5: Underestimating Transfer Pricing Exposure
If your US entity buys from, sells to, lends to, or licenses intellectual property from your foreign parent or affiliates, those transactions must be priced as if they were conducted between unrelated parties - this is the arm's length standard.
The IRS scrutinizes intercompany transactions closely, particularly when a US subsidiary is consistently unprofitable while related foreign entities are profitable. This pattern - which can arise naturally in legitimate business structures - looks like profit shifting to tax authorities and triggers detailed inquiry.
The penalty for transfer pricing adjustments is 20% of the underpayment, rising to 40% for gross valuation misstatements. These penalties apply on top of the tax owed and interest — and they are difficult to abate.
What to do instead: Document your transfer pricing methodology before the transactions occur, not after. A contemporaneous transfer pricing study is the IRS's standard for penalty protection. If your US entity transacts regularly with related parties, this isn't optional — it's the cost of doing business across borders.
Mistake 6: Letting Compliance Slip After Year One
The first year of a US expansion typically involves careful setup - often with professional help. The mistakes often compound quietly in years two and three, when the business feels established and compliance feels routine.
Common year-two and year-three failures:
- Nexus thresholds crossed in new states as the business grows, with no corresponding registration
- New intercompany transactions (loans, IP transfers, shared services) documented informally or not at all
- Payroll added in a new state without registering as an employer there
- Annual state reports and franchise tax filings missed as deadlines accumulate
What to do instead: Treat US compliance as a living, evolving obligation — not a one-time setup task. As your business grows, your compliance footprint grows with it. Schedule an annual compliance review with your CPA to identify new obligations before they become penalties.
The Pattern Behind All of These
Almost every mistake on this list shares a common root: decisions made without understanding how US rules apply to a foreign-owned structure specifically. Many of these rules don't apply the same way to domestic US businesses - or don't apply at all. That's precisely why general-purpose advice, or advice from a CPA unfamiliar with international structures, often misses the gaps that matter most.
IB-CPA specializes in exactly this intersection - US tax and compliance for foreign-owned businesses. If you're planning a US expansion or have already set up and want a compliance review, [get in touch with us](https://ib-cpa.com/contact). It's a much easier conversation to have before a penalty notice arrives.
This concludes the IB-CPA US Expansion Series. Read the full series:
- Part 1: Tax & Compliance Foundations
- Part 2: Step-by-Step Setup Guide
- Part 3: Common Mistakes (this article)
