Are You Taxed in the US? ECI for Non-Resident LLC Owners

You will be told that a foreign-owned US LLC is tax-free. It is the most common sales line in this category and it is not a rule that exists.

You will also be told the opposite, that a US company means US tax. Also not a rule.

Both are attempts to give a general answer to a question that turns on specific facts. The honest version is that some non-resident owners owe US tax on their LLC's income and some do not, and which one you are is determined by the test below.

"A foreign person generally must be engaged in a U.S. trade or business during the tax year to treat income received in that year as ECI, which is taxable in the U.S."

IRS, Effectively Connected Income (ECI). Page last reviewed or updated August 18, 2026. Two steps. Are you engaged in a US trade or business. If so, is the income US-source and connected with it.

Note what is not in that sentence. Not where the company was formed. Not where the bank account is. Not whether customers are American. Those facts may be relevant to the analysis, but none of them is the test, and treating any of them as decisive is where bad advice comes from.

We are not going to give you worked examples that tell you which side you are on.

That would mean applying the trade-or-business test to invented facts and inviting you to match yourself to the nearest one. The test is fact-specific and the matching exercise is exactly how people reach confident wrong answers. A page that hands you a conclusion here is doing you harm while appearing to help.

What we can tell you is what moves the analysis and what does not.

The state you formed in. Wyoming, Delaware and New Mexico are identical for this purpose.

That the LLC is disregarded. Disregarded is a classification, not an exemption. It determines who reports the income, not whether it is taxable.

That you have never visited the US. Physical presence is one input among several and its absence does not settle the question.

That your bank is a US fintech. Where the account sits is not the test.

Where the work is physically performed. Whether anyone acts for you in the US. Whether you have a fixed place of business there. What you sell and how it is delivered. Whether a treaty applies, and there is no US income tax treaty with Nigeria and none with Brazil, which materially changes the analysis for founders in those two countries.

Each of those can push the analysis in either direction depending on the rest of the picture. None is a test you can apply alone.

This part is not fact-specific and is worth separating out, because people conflate the two.

A foreign-owned single-member LLC files Form 5472 with a pro forma Form 1120 every year, whatever the answer to the ECI question. It is an information filing, not an income tax return, and it is due even in a year with no income at all.

Failing to file Form 5472 when due and in the manner prescribed carries a $25,000 penalty.[1]Internal Revenue Service, Instructions for Form 5472 (12/2024)

So "I have no US tax" and "I have nothing to file" are different statements, and the second one is almost never true.

Not "consult a professional" as a disclaimer. Here is the boundary.

You do not need one to know that you file Form 5472, or to know your state's annual deadline, or to open accounts. Those are procedural.

You do need one when: you are deciding whether you are engaged in a US trade or business; you have anyone performing work for you inside the US; you hold inventory in the US; you are relying on a treaty position; you have already received income and have not determined its character; or your home country taxes worldwide income and you need the two systems reconciled.

Ask for a US tax practitioner with non-resident experience, and ask for a written conclusion rather than a conversation. The question is narrow and the answer is worth having in writing.

Is a foreign-owned US LLC tax-free? No such rule exists. Whether your income is taxable in the US depends on whether you are engaged in a US trade or business and whether the income is connected with it. Anyone stating a general answer is not describing the law.

I have US customers. Does that mean I owe US tax? Having US customers is not the same as being engaged in a US trade or business. It is one fact among several and it does not settle the question by itself.

Does forming in Wyoming instead of Delaware change my tax? No. The state of formation is not part of the ECI test.

If I owe no US tax, do I still file anything? Yes. Form 5472 with a pro forma 1120 is an information filing due annually regardless, and missing it carries a substantial penalty set out on the Form 5472 page.

Is there a treaty that helps me? Depends on your country, and there is no US income tax treaty with Nigeria or Brazil. Where a treaty exists, relying on it is a position to take with advice rather than an assumption.