Do Non-Resident Entrepreneurs Owe US Income Tax? (Probably Not)

Here's the line that's cost European founders millions in tax they never owed: "You're selling into the US, so you have to pay US tax." It's wrong far more often than it's right. Most non-residents who sell products and services into the US owe zero US federal income tax, and the reason most accountants get it backwards is that international tax has a counter-intuitive test sitting at the center of it. This is that test, explained the way I wish someone had explained it to me.

One disclaimer up front, because this topic deserves it: I'm a founder who has set this up 50+ times, not your tax attorney. The analysis below is the general framework. Your facts can shift the answer. Read it to understand the question your CPA should be answering, then make them answer it.

First, Who Are We Talking About?

This article is about non-resident aliens, the IRS's term for people who are not US citizens, not green-card holders, and who don't spend enough days in the US to flunk the substantial presence test. If you're a founder living in Berlin, Lisbon, Bucharest, or Tallinn, running a business that touches US customers but you yourself live and work outside the US, this is you.

If you have a US work visa, a green card, or you're physically in the US most of the year, stop reading, you're in a different (and much more taxing) bucket, and you should talk to a CPA about worldwide income.

The US Has Two Completely Different Tax Regimes

The single biggest source of confusion is that people treat "US tax for foreigners" as one thing. It's two. They have different rates, different mechanics, and different triggers. Mixing them up is where the bad advice comes from.

The passive regime is mechanical. If a US company pays you a dividend or a royalty, they withhold 30% (or your treaty rate) before the money leaves the country, and you're done. A US platform paying you for book or video royalties is the classic example, that's passive, and withholding handles it.

The active regime is where the money is, and where almost everyone goes wrong. Active business income is only taxable if you cross the ETBUS threshold. Cross it, you're taxed like a US business. Don't cross it, your US business income is simply not subject to US income tax, even if every customer is American and every dollar is earned in the US.

ETBUS: The Test That Decides Everything

ETBUS stands for Engaged in a Trade or Business within the United States. It's the gate. Walk through it and your active income becomes US-taxable. Stay outside it and it doesn't. For a non-resident running a business from abroad, two things have to be true to be ETBUS:

1. You have a dependent agent operating inside the US. A dependent agent is someone who works for you and substantially under your control, an employee, or a contractor working largely and exclusively on your behalf, physically present in the US.
2. That activity is considerable, continuous, and regular. A one-off or trivial touchpoint doesn't count. The presence has to be a real, ongoing part of how the business operates.

The dependent-agent requirement is the load-bearing wall. If nobody is acting as your dependent agent on US soil, you almost certainly are not ETBUS, and your active business income is not subject to US federal income tax. That's the whole game.

Dependent vs Independent Agents (This Is the Crux)

Whether the people and platforms you work with are dependent or independent agents decides your entire tax outcome. The distinction is simple once you see it.

The test for "independent" is essentially: does this person or company run their own business, of which you are merely a customer? If yes, they're independent, and their US presence is theirs, not yours. Amazon doesn't become your US operation because you sell through it, any more than a shipping company becomes your operation because it delivers your boxes.

An Example to Make It Concrete

Say you run an e-commerce brand from Lisbon. Your products are manufactured in Asia, shipped to Amazon's US warehouses, and Amazon stores, picks, packs, and ships every order to American customers. You handle marketing and operations from your laptop in Portugal. Payments run through Amazon and Stripe.

Where is your dependent agent in the US? There isn't one. Amazon is an independent company running its own logistics business; you're one of millions of sellers paying for a service. Stripe is the same. Nobody on US soil is acting under your direction and control as an extension of your business. Result: not ETBUS, no US federal income tax on those profits.

Now hire a full-time US warehouse manager who works only for you, takes your direction, and runs your US fulfillment. You've just planted a dependent agent on US soil. Now you're likely ETBUS, and the profits become US-taxable. Same products, same customers, completely different tax answer, decided entirely by that one hire.

Five Myths That Cost Founders Money

Every one of these gets repeated by well-meaning accountants who don't work in international tax. None of them is true.

So Why Form a US LLC at All?

If the LLC doesn't change your income tax, what's it for? Plenty, just not the thing people assume. A US LLC earns its keep on the operational side:

• US bank accounts. Mercury, Relay, and the rest want a US entity with an EIN before they'll open an account.
• Liability protection. The "LL" in LLC, your personal assets sit behind the entity wall.
• Credibility with US customers and partners. "Acme LLC, Delaware" reads very differently to an American buyer than a personal name abroad.
• Cleaner payment processing. Stripe, payment gateways, and merchant accounts integrate more smoothly behind a US entity.
• Amazon Brand Registry and similar programs that expect a registered business.
• The credit ladder. The entity plus an EIN plus an ITIN is the on-ramp to US business credit, which is the entire reason most founders I work with set this up.

None of those benefits flips your ETBUS status. You get the bank account, the protection, and the credit access without inheriting a tax bill, provided you keep your operations running through independent agents.

"Owe No Tax" and "File Nothing" Are Not the Same Thing

This is where founders who get the tax part right still blow up. Zero tax due does not mean zero filings. The IRS still wants paperwork.

• Foreign-owned single-member LLC: you must file Form 5472 attached to a pro-forma Form 1120 every single year, even at zero revenue and zero tax. Skip it and the penalty is $25,000. This one catches people who assumed "no tax = no filing."
• Multi-member LLC: taxed as a partnership, files Form 1065 and issues K-1s to the members.
• If you ever do have effectively-connected income: you (the individual) file Form 1040-NR, and you'll need an ITIN to do it.

Treat the filings as non-negotiable hygiene. They're cheap to do and ruinous to miss, and they're what keeps the "I owe nothing" position clean and defensible.