ECI Effectively Connected Income Explained

What "Effectively Connected Income" Actually Means

Effectively Connected Income, almost always shortened to ECI, is the slice of a non-resident's income that the United States is allowed to tax because it arises from a US trade or business. The phrase comes from Internal Revenue Code Section 864, and the entire reason it matters to a non-resident Wyoming LLC owner is that the US does not tax foreign people on their worldwide income. It taxes them on only two narrow categories: income that is effectively connected to a US trade or business (ECI), and US-source passive income known as FDAP. If your earnings fall outside both buckets, the US federal income tax owed is zero, even though you ran every dollar of revenue through a US-registered company.

That last point trips up almost everyone the first time they hear it. People assume that because the LLC is American, the profit must be American, and therefore taxable in America. The LLC's nationality is not the question. The question is where and how the income-producing work is performed and whether that work amounts to a regular, continuous, and substantial business activity inside US borders. A Wyoming LLC is just a legal wrapper. The IRS looks straight through a single-member foreign-owned LLC (it is a disregarded entity) and asks about the human being behind it: what did you actually do, and where did you do it?

So ECI is best understood as a label the IRS attaches to income only after a factual test is met. There is no box you check to "elect" ECI and no automatic rule that says "you have a US company, therefore you have ECI." The default for a typical non-resident running a location-independent business from abroad is no US trade or business, no ECI, and no US income tax. ECI is the exception, and this guide is mostly about understanding when that exception actually applies.

The Two-Step Test: US Trade or Business, Then Effective Connection

The law gets to ECI in two logical steps, and it helps to keep them separate. Step one asks whether you are even engaged in a US trade or business at all (often abbreviated USTB). Step two asks, assuming a USTB exists, which specific items of income are effectively connected to it. If step one fails, step two never starts and you have no ECI. The overwhelming majority of non-resident digital businesses fail step one, which is why they owe nothing.

The Internal Revenue Code does not define "trade or business within the United States" with a clean bright line. It tells you a few things it includes (such as performing personal services in the US) and a few it excludes, but the core meaning has been built up by decades of court decisions and IRS guidance. The settled standard is that the activity must be considerable, continuous, and regular, and it must be carried on inside the United States. An occasional transaction, a one-off sale, or activity that is genuinely conducted from abroad does not rise to a US trade or business.

Step two, the "effectively connected" part, only becomes relevant once a USTB exists. For income that is itself US-source business income, the connection is usually obvious. For certain other types of income the Code uses two sub-tests, the asset-use test and the business-activities test, to decide whether passive-looking income should be pulled into the ECI net because it relates to your active US business. For the typical reader of this page, step two is academic, because step one is never satisfied in the first place. Spend your energy on step one.

The Factors the IRS Weighs

Because there is no single statutory line, the analysis is fact-specific, and the IRS and courts look at a cluster of indicators. No single factor is decisive on its own, but the more of them point toward a genuine US operation, the closer you are to having a US trade or business and therefore ECI. The factors that matter most are:

• A physical office or other fixed place of business located in the United States.
• US-based employees on payroll (W-2 staff working inside the US).
• A dependent agent who acts in the US on your behalf and habitually concludes contracts that bind your business, as opposed to an independent contractor.
• Substantial US-based equipment, machinery, or inventory used in the business.
• Personal services physically performed by you while you are inside the United States.
• Activity in the US that is regular, continuous, and substantial rather than sporadic.

Notice what is absent from that list. The location of your customers is not a factor. Selling to Americans, billing American clients, or having most of your revenue arrive from US buyers does not, by itself, create a US trade or business. The location of your bank account is not a factor either; a Mercury, Relay, or Wise account does not put your business inside the US for tax purposes. Where your website is hosted is generally treated as unimportant on its own. The center of gravity is people and physical presence performing the income-producing work inside US borders.

Why Most Non-Resident Digital Businesses Have No ECI

Run the factors against a normal online business operated from abroad and they almost all come up empty. A SaaS founder in Lahore whose servers are on AWS and whose two developers also live in Pakistan has no US office, no US staff, no US dependent agent, and performs no services inside the US. Every income-producing activity happens abroad. There is no US trade or business, so there is no ECI, and the US federal income tax on that profit is zero. The same logic covers most of the businesses the people forming these LLCs actually run:

• SaaS and software sold to US customers, where the team and infrastructure sit outside the US.
• Dropshipping with no US employees and no US office, where you place orders with suppliers and they ship.
• Freelance and agency services performed from your home country for clients anywhere.
• Content monetization (YouTube, Patreon, sponsorships, courses) with no US studio or US staff.
• Affiliate marketing run entirely from abroad.
• A holding company that merely owns assets or IP and conducts no operating activity.

It is worth stressing that "no ECI" does not mean "no filing." A foreign-owned single-member Wyoming LLC is a disregarded entity and must file Form 5472 together with a pro forma Form 1120 every year, reporting reportable transactions between you and the LLC, with a hard April 15 deadline (extendable to October 15 with Form 7004). That obligation exists whether or not you have one cent of ECI. The penalty for missing it is severe, starting at $25,000 under IRC Section 6038A. ECI determines whether you owe income tax; Form 5472 is an information return you owe regardless. Do not confuse the two.

The Grey Zones: Amazon FBA, US 3PLs, and US Contractors

Real life is messier than the clean cases, and three situations come up constantly because they put something of yours physically inside the United States. The first is Amazon FBA, where your inventory sits in Amazon's US fulfillment warehouses. The conventional and widely held position among practitioners is that FBA does not create ECI: Amazon acts as an independent contractor rather than your dependent agent, you have no US office and no US employees, and the mere location of inventory in a third party's warehouse has not historically been treated as enough to constitute a US trade or business on its own. This is a position, not a guarantee. The IRS has never blessed it in a public ruling that puts the question entirely to rest, and the conservative move for a serious FBA seller is a written opinion from a US CPA or international tax attorney that documents the facts and the analysis.

The second grey zone is dropshipping or e-commerce fulfilled through a US-based third-party logistics provider (a 3PL). The analysis tracks FBA closely: it turns on whether the 3PL is genuinely an independent contractor providing a service to many customers, or whether you have so much control over it that it starts to look like your own US operation. A standard arms-length 3PL contract leans toward independent-contractor treatment and away from ECI. The more the warehouse functions as a captive extension of your business, with your direction over staff and operations, the more the picture shifts.

The third is hiring people in the US. An independent contractor you engage for a discrete service generally does not create ECI, even though they are physically American. The dangerous figure is the dependent agent: someone who works substantially for you, takes your direction, and habitually negotiates and concludes contracts that bind your business while standing on US soil. That person can pull you into a US trade or business. The line between an independent contractor and a dependent agent is fact-specific, and it depends on control, exclusivity, and authority, not on the label written in the agreement.

A Side-by-Side Comparison

The following table contrasts common setups. Treat it as orientation, not as a substitute for advice on your exact facts, because a single changed detail (you fly in and close a deal in person, you sign a lease, you put a salaried employee on the ground) can flip a row.

The pattern across the table is consistent. The three "no" columns staying empty is what keeps you out of ECI. Once any of them flips to "yes" in a substantial, continuous way, you are in or near a US trade or business and the income attributable to that activity becomes effectively connected.

A Worked Example, Start to Finish

Consider Lina, a designer and developer based in Cairo. She forms a Wyoming LLC, gets an EIN, opens a Wise account, and bills $120,000 over the year to a mix of US and European clients. She works entirely from her apartment in Egypt. She has no US office, no US employees, and she never sets foot in the United States during the year. Walk the two-step test: step one asks whether she has a US trade or business. She does not, because every income-producing activity she performs happens in Egypt. Step one fails, so step two never begins. Her income is not ECI. Her US federal income tax on that $120,000 is zero, and she files no Form 1040-NR because she has no ECI and no taxable US income. She still files Form 5472 with a pro forma 1120 for the LLC, because that information return is owed regardless. She also files and pays tax in Egypt under Egyptian law, which is a separate matter the US does not touch.

Now change one fact. Suppose Lina decides to scale and leases a small office in Austin, hires a US-based salesperson on a W-2 who pitches and closes contracts on the company's behalf while in Texas, and spends three months a year working from that office herself. Re-run step one. She now has a fixed US place of business, a dependent US agent concluding contracts, and personal services performed inside the US. That is a US trade or business. Step two then attributes the profit generated by that US operation to ECI, and that net ECI is taxed at the graduated US individual rates (10% to 37%) on a Form 1040-NR, after allowable deductions, with possible state-level tax on top depending on where the activity occurs. The legal wrapper did not change; the facts did, and the facts are what create ECI.

The contrast between the two versions of Lina is the whole lesson. A non-resident does not stumble into ECI by accident through normal online operations run from abroad. ECI shows up when you deliberately build a real, staffed, physical US presence.

What Happens If You Do Have ECI

If you cross the line, the consequences are concrete and worth understanding before you decide to build US operations. ECI is taxed on a net basis, meaning you deduct business expenses connected to that income before applying the graduated rates, which is more favorable than the gross taxation that applies to FDAP. A non-resident individual reports ECI on Form 1040-NR. The rates run from 10% to 37%, and depending on where the activity is conducted, a US state may also tax the income (Wyoming itself has no state income tax, but the state where your office and employees actually sit is what matters for state tax, not the state of formation).

There is also a withholding layer for multi-member structures. A foreign-owned multi-member LLC is treated as a partnership, files Form 1065, and issues Schedule K-1s. When that partnership has ECI allocable to a foreign partner, Section 1446 requires the partnership to withhold tax on the foreign partner's share and report it on Form 8805, with the foreign partner then filing a 1040-NR. So in the partnership case, ECI does not just create a filing for the owner; it creates a withholding and remittance duty for the entity itself. None of this applies if there is no ECI, which is the usual situation, but it is the machinery that switches on the moment ECI appears.

The practical takeaway is that having ECI is not a catastrophe; it is simply being taxed like a US business on the US portion of your activity, often at competitive net rates. The point of the analysis is to know whether you are there, to do it deliberately, and to file correctly, not to pretend the income is foreign when the facts say it is not.

Common Mistakes and Edge Cases

A handful of errors recur often enough to call out directly. Avoiding them is most of getting ECI right:

• Believing US customers create ECI. They do not. Customer location is irrelevant to the US-trade-or-business test.
• Believing the US bank account or US LLC creates ECI. Neither does. The entity and its banking are wrappers; the work is what counts.
• Confusing ECI with the Form 5472 obligation. You file 5472 even with zero ECI. The two questions are independent.
• Assuming "no ECI" means "no tax anywhere." Your home country almost certainly taxes the income under its own rules. The US being silent does not make the money tax-free globally.
• Treating FBA or a US 3PL as obviously safe. They are defensible grey areas, not settled law. Get a written CPA opinion for meaningful volume.
• Misjudging a US hire. The independent-contractor versus dependent-agent distinction turns on control and contract-concluding authority, not on the title in the paperwork.
• Ignoring short US visits stacking up. A single trade show rarely matters, but if you start personally performing income-producing services in the US on a recurring basis, the picture can shift toward a US trade or business.

The edge cases share a theme: they are situations where something of yours (inventory, a contractor, your own body) is physically inside the United States. When that happens, stop guessing and document the analysis, or pay a US CPA to write it down. Keep contemporaneous evidence of where your team sits, where your servers and contractors are, and where you performed the work, so that if the position is ever questioned you can defend it with facts from the year in question rather than reconstructing them later.

How to Support and Document a No-ECI Position

If your honest conclusion is that you have no ECI, protect that conclusion with evidence. The position is only as strong as your ability to demonstrate the underlying facts. Keep records showing that the income-producing work is performed outside the US: the locations of your team, your servers, and your contractors; invoices and contracts showing where you sat when you did the work; travel records showing you were not performing services inside the US. Use independent contractors rather than dependent agents who can bind the business on US soil, and keep contracts that reflect genuine independence. Avoid a fixed US office and US employees unless you have decided, deliberately, to be taxed on ECI.

Write the analysis down once a year, even briefly, so there is a contemporaneous record of why you concluded there was no US trade or business for that tax year. For genuine grey areas, FBA inventory or a US 3PL above all, pay for a written opinion from a US CPA or international tax attorney. That document is cheap insurance: it shows you took a reasoned position rather than ignoring the question, and it gives you something concrete to stand behind. Remember that filing Form 5472 with a pro forma 1120 does not declare your ECI status one way or the other; it is an information return. If you genuinely had ECI, the 1040-NR is the form that reports and taxes it, and that is the filing that would be missing if you got the analysis wrong.

If you have not yet set up the structure underneath all of this, that is the natural starting point. You can form a Wyoming LLC for $397 all-inclusive, with the LLC typically formed in about 24 hours and an EIN obtainable in roughly 8 to 10 business days even without an SSN, no US visit, address, or visa required. Wyoming itself charges no state income tax and no franchise tax, which keeps the entity-level overhead low while you run the ECI analysis above on your actual operations.