Effectively Connected Income (ECI) is the tax concept that determines whether your foreign-owned US LLC owes US federal income tax. Whether you sell on Amazon, run a consulting practice, build SaaS, or sell digital products, ECI is the line between paying US taxes as foreign-owned LLC and not paying them.
This guide explains what ECI is, which business models trigger it, and how to structure your business correctly.
Key takeaways
- ECI only applies if your income is both US-sourced and connected to a US trade or business (ETBUS). Both conditions must be true.
- Having US customers does not automatically mean you have ECI. What matters is where your income-generating activity takes place and where ownership of goods transfers.
- Service and digital businesses (consulting, SaaS, coaching, digital products) are generally not ECI if all work is performed outside the US and you have no US employees or office.
- E-commerce sellers who buy inventory from third parties and sell to US customers most likely generate ECI, because ownership transfers on US soil, regardless of where the goods were shipped from.
- Every foreign-owned single-member LLC with any reportable transaction must file a US information return annually (Form 5472 + pro forma Form 1120), even with zero income and zero tax due. Missing this filing can trigger a $25,000 penalty.
ECI can be complex and nuanced, especially for e-commerce entrepreneurs. This overview is provided for educational purposes. Please consult with a tax professional (like our team) to get personalized tax advice for your situation.
What is Effectively Connected Income (ECI)?
ECI is income earned by a foreign person or foreign-owned entity that is “effectively connected” to a US trade or business. If your LLC generates ECI, that income is taxed in the United States at federal tax rates with the same brackets that apply to US residents. The IRS calculates the tax on net income after deductions.
Effectively Connected Income (ECI): Income from a foreign-owned business that is both US-sourced and connected to an active US trade or business. ECI is taxed at graduated US rates on net income (after deductions).
The two-step logic that governs everything:
- Is the income US-sourced?
- If yes, is the business engaged in a US trade or business (is the business ETBUS)?
ECI requires both conditions. Understanding them separately is how you avoid the most costly mistakes.
One thing worth clarifying upfront, because it confuses nearly every founder we work with: having US customers does not automatically mean you have US-sourced income. And having US-sourced income does not automatically mean you have ECI. These are different questions, and the answer depends entirely on your business model.
The ETBUS test: what does “engaged in US trade or business” mean?
ETBUS — Engaged in Trade or Business in the United States — is the threshold that determines whether ECI rules apply to your LLC at all. (The IRS formally calls this a “US Trade or Business” or USTB, but ETBUS is the term most widely used. It’s also sometimes called “ETOB”)
ETBUS (Engaged in Trade or Business in the United States): According to the IRS, business activities must be “considerable, continuous and regular” to be ETBUS.
There is no single bright-line definition in the tax code. The IRS uses a facts-and-circumstances test. Two factors it weighs most heavily:
Regularity and continuity. Are you conducting ongoing, sustained operations in the US market, meaning regular sales cycles, consistent fulfillment, recurring customers? The more continuous and regular your US operations, the more likely ETBUS applies.
The dependent agent test. Do you have someone in the US acting on your behalf with authority to negotiate contracts or represent the business? A US employee almost always qualifies. Even if they are not an employee but if they are actively signing contracts on your behalf, the IRS can consider this a dependent agent.
One important clarification: having US customers does not make you ETBUS. Receiving Zoom calls from US clients, running ads targeting American buyers, or invoicing in USD. None of these, by themselves, establish that you are engaged in a US trade or business.
What matters is where the activity is performed and whether you have a US operational footprint.
What triggers ETBUS
Note: a virtual office does not create a physical place of business for ETBUS purposes.
What does not trigger ETBUS
US-sourced vs. foreign-sourced income: the question that comes before ECI
Before asking whether income is ECI, you need to establish whether it is US-sourced at all. This is where most online content and a lot of advice circulating in reddit communities like r/FulfillmentByAmazon and r/Entrepreneur get it wrong.
US-sourced income: Income that the IRS considers to originate from within the United States, based on where services are performed, where goods change ownership, or where the income-generating asset is located.
The sourcing rules differ by income type:
Providing services
Services are sourced where the work is physically performed, not where the client is. A consultant in Berlin doing work for a company in Austin earns foreign-sourced income. It does not matter that the client is American, the invoice is in US dollars paid into a US business bank account, or the work is discussed on a call with someone in Texas. The work happened in Germany. That is where the income is sourced.
Selling physical products
Physical goods are sourced based on where ownership (title) transfers to the buyer, not where the seller is located. If your LLC buys inventory and sells it to US customers, and title passes to those customers on US soil, the income is typically US-sourced. This rule catches nearly every e-commerce founder off guard.
Selling digital products and SaaS
Digital products and SaaS are generally sourced to where the seller operates and delivers the service, not where the customer downloads or uses it.
The business model matters
This is why two founders can both have “US customers” and face completely different US tax obligations. The question is never “do I have US customers?” It is “where does the income-generating activity actually occur, and where does ownership transfer?”
Business model breakdown: does your business generate ECI?
| Business model | US-sourced income? | ETBUS? | ECI? |
| Consulting / coaching / services performed abroad |  No | No | No |
| SaaS / digital products, no US staff | No | No | No |
| Dropshipping (LLC never holds title) |  Generally no | No | No |
| E-commerce: goods manufactured by the LLC outside the US | No (sourced to country of production) | Depends | No |
| E-commerce: goods bought from supplier, sold to US customers |  Yes (ownership transfers in US) | Yes (for active sellers) | Yes |
| Amazon FBA (standard reseller model) | Yes | Yes | Yes |
| Any model with a US-based employee | Yes | Yes | Yes |
| Any model with a US office | Yes | Yes | Yes |
Consulting, coaching, and service businesses
This is one of the cleanest structures for foreign LLC owners, if the work stays outside the US.
If all services are performed abroad, the income is foreign-sourced. There is no ECI. It does not matter where the client is, what currency the invoice is in, or how much time is spent on video calls with US-based customers. The decisive factor is where the work physically happens.
The mistake we see regularly at Entity Inc. is founders adding unnecessary US presence without realizing the tax consequences. A US-based assistant. A desk at a WeWork in New York. These seem minor but can introduce ETBUS exposure.
If you travel to the US to deliver services in person, that portion of income becomes US-sourced for the time you are working on US soil. Keep records of where work is actually performed.
E-commerce and the ownership transfer rule
This is where the most significant and most costly misunderstanding is.
Questions like this appear constantly in Reddit communities like r/FulfillmentByAmazon: “I source my products from China, I’m based in Europe, I have no US employees or office. My products just happen to be in Amazon warehouses. Why would I owe US taxes?”
The answer is a rule that most blog posts never mention: income from selling physical goods is sourced based on where title (ownership) transfers to the buyer.
Not where the seller is located, not where the goods were manufactured, not where they were shipped from.
If your LLC buys inventory from a supplier, anywhere in the world, and sells those goods to US customers, and title transfer happens in the US, then the income is in most cases US-sourced. For most active e-commerce sellers with regular sales (ETBUS), that US-sourced income typically is ECI.
But we sometimes see cases where title is transferred once the freight leaves the dock (Freight On Board). This is not ECI because the title was transferred in the home country.
There is another meaningful exception: if your LLC manufactures the goods itself outside the US, the income is sourced to the country of production, not the US. That is a real and significant distinction, but it applies to manufacturers, not businesses buying inventory from third-party suppliers.
Amazon FBA – where most get it wrong
The FBA question is the one we get asked often at Entity Inc., and it is also the subject of the most persistent misinformation online. Let us be direct.
Amazon considers the seller to be the owner of the product. Title does not transfer to Amazon; it transfers from the seller to the US customer when the sale is made, on US soil. For sellers buying inventory from third parties, that makes FBA income US-sourced.
Some content online argues that Amazon acts as an independent contractor, not exclusively for one seller, not a dependent agent in the legal sense. And therefore FBA does not trigger ETBUS. This argument misapplies the dependent agent concept.
The dependent agent test is one pathway to ETBUS, but it is not the only one. Year-round FBA operations with regular restocking cycles almost always satisfy the IRS standard of “considerable, continuous and regular” business activity.
Even though Amazon’s business is fulfillment and it’s essentially not a “dependent” for any one client, the fact that these transactions do occur in the US and the seller owns the inventory when it changes hands (and not Amazon) and it typically meets the ‘considerable, continuous, and regular’ threshold makes it ECI in the US.
For most standard FBA sellers who buy and resell inventory: the income is US-sourced, you are ETBUS, and the income is ECI. Filing Form 1040-NR and paying US tax on net FBA profits is the correct position.
Dropshipping (not via Amazon or similar platforms)
Pure dropshipping — where your LLC never takes title to any goods and a supplier ships directly to the US customer — is generally treated more like a service arrangement. Your LLC earns a commission for connecting customers and suppliers.
Since the LLC never owned the inventory, the ownership transfer rule does not apply in the same way, and the income is generally not US-sourced. The structure must be real and documented. The LLC must genuinely never hold title. It can’t pay the supplier to build an inventory.
SaaS and digital products
SaaS, digital downloads, and online courses are among the cleanest models for foreign LLC owners. Income is generally sourced to where the seller operates and delivers the service, not where the customer accesses it. With no US employees, no US office, and fully automated delivery, there is no ETBUS and therefore no ECI.
What “no US footprint” means in practice:
- No W-2 employees in the US
- No physical office or co-working membership in the US under the LLC’s name
- Fully automated delivery with no US-based operational involvement.
The moment you hire a US-based developer, customer support agent, or operations person, ETBUS exposure enters the picture. That first US hire is not just an HR decision, it is a tax structure decision.
US-based employees and contractors
A single US-based W-2 employee is the clearest and most common ETBUS trigger we see. It almost certainly establishes ETBUS and converts what might have been a foreign-sourced business into one with real US tax obligations.
Contractors are more nuanced. A true independent contractor — working for multiple clients, setting their own schedule, using their own tools — is generally not a dependent agent. But a contractor working exclusively for your LLC on an ongoing basis, under your direct control, looks more like a dependent agent, which can trigger ETBUS.
Dependent agent
A person or company in the US that works primarily or exclusively for your LLC and has the authority to act on its behalf, for example, by concluding contracts. A dependent agent’s presence in the US can create ETBUS even without a physical office.
This is an expensive mistake we often see. A founder hires a US-based virtual assistant or operations person, treats it as a simple contractor relationship, and it silently flips the entire tax analysis. Before any US hire, talk to a CPA.
What happens when you have ECI?
If your LLC generates ECI, here is what that means in practice:
The IRS requires you to file Form 1040-NR as the foreign individual owner. State-level filing obligations may also apply depending on where your business activities are concentrated.
The tax is calculated on net income, meaning you can deduct ordinary and necessary business expenses before the tax is applied. For businesses with real costs of goods, platform fees, advertising, and operations, the actual tax bill is often lower than founders expect once you properly claim deductions.
What you want to avoid: unfiled returns with known ECI exposure. If you don’t file a return to disclose ECI, or don’t file on time, the IRS may disallow deductions and tax the gross income. That outcome is dramatically worse than filing and paying tax on net income.
This is where good bookkeeping becomes essential. To claim every legitimate deduction against ECI, you need organized, accurate records:
Without clean books, you might miss deductions and your taxable income is higher than it should be. At Entity Inc., our bookkeeping team works directly alongside our tax team for this reason. We make sure to capture every deductible expense before filing your tax return. (See our Entity Inc. bookkeeping packages)
How ECI works for foreign-owned LLCs
A typical decision flow showing how foreign-owned LLC income may be evaluated for potential US tax exposure under ECI rules.
LLC vs. C Corp when ECI is in the picture
When you have ECI, an LLC might not be the best business structure. Changing it to a C Corporation may have advantages. To change is fairly straightforward: the LLC basically elects to be taxed as a C Corporation by filing an IRS form.
| LLC (default) | C Corp | |
| How ECI is taxed | Passes through to the foreign owner’s personal return; taxed at graduated rates (10%–37%) | Taxed at entity level; flat 21% federal rate |
| Deductions | Available at individual level | Available at corporate level |
| Owner salary | Not applicable (owners take draws, not salaries) | Salary paid to foreign shareholders is a corporate deduction and not US-source income to the shareholder |
| Compliance overhead | Lower | Higher |
| Best for | Service, SaaS, digital product businesses with no US footprint | E-commerce and other models where ECI is unavoidable |
| Raises VC funding | More complex | Preferred structure for investors |
For most foreign founders without a US operational footprint (consultants, SaaS founders, digital product creators) an LLC remains the right default. It is simpler and when structured correctly, generates no US tax obligation at all.
When you can’t avoid ECI, the C Corp deserves serious consideration. The flat 21% rate is often lower than what a foreign individual would pay at graduated rates, and the salary deduction mechanism creates meaningful planning opportunities for active business owners. Salary to foreign shareholders is generally not US-source if services are performed outside the US, which can save taxes.
The right answer depends on your income level, home country tax rules, and applicable tax treaties. Our tax team can analyze your specific situation and provide guidance.
If you are an e-commerce seller with US inventory and no intention of changing that model, do not default to the LLC simply because it is more familiar. Get the structure right from the start. Learn more in our LLC vs. C Corp guide for non-US residents.
Already have ECI exposure? Here is what to do
If you have been operating under the assumption that your LLC was tax-free and you are now realizing it may not be, the most important thing is: do not ignore it. And don’t panic.
If you filed incorrectly, those mistakes can be corrected. If you haven’t filed at all, you can still catch up.
Late filing is substantially better than non-filing. The IRS has provisions for late filers, and voluntary disclosure can reduce penalties. But unfiled returns with ECI exposure compound every year. Back taxes, interest, and penalties accumulate. The IRS can also assess tax on gross income with no deductions if returns were never filed, which is the worst possible outcome.
Get your documentation together: contracts, invoices, records of where services were performed or where inventory was sourced and sold. Then work with a CPA who specializes in cross-border taxation. This is not a generalist tax situation.
This is exactly the kind of situation we handle at Entity Inc. If you are unsure whether your business has ECI exposure, the right move is to find out now.
Frequently asked questions
Does having a US LLC automatically mean I owe US taxes?
No. A foreign-owned single-member LLC does not automatically create US tax liability. However, every LLC with any reportable transaction must file Form 5472 and a pro forma Form 1120 annually, even with no income. A US LLC only owes US taxes if the LLC generates Effectively Connected Income, that is income that’s both US-sourced and tied to a US trade or business.
Does selling to US customers mean I have ECI?
Not automatically. For service businesses, what matters is where the services are physically performed, not where the client is. For physical goods, income is sourced based on where ownership of the goods transfers to the buyer. Having US customers is not, on its own, a taxable event.
Is Amazon FBA income subject to US tax for foreign LLC owners?
Yes, in most standard FBA scenarios. Amazon considers the seller the owner of inventory until a US customer purchases it, so ownership transfers on US soil. Combined with “considerable, continuous and regular” FBA activity, this typically establishes both US-sourced income and ETBUS, making FBA profits taxable. The exception: if you manufacture the goods yourself outside the US, the income sourcing analysis is different. – This is nuanced! Consult an experienced CPA.
Are digital products and SaaS income ECI for foreign LLC owners?
Generally no, provided there are no US employees, no US office, and no other US operational presence. Digital product and SaaS income is typically sourced to where the seller operates, not where the customer is located.
Do I have to file a US tax return even if I owe no US taxes?
Yes. Every foreign-owned single-member LLC with reportable transactions must file Form 5472 and a pro forma Form 1120 each year, regardless of income or taxes owed. Missing this filing can trigger a $25,000 penalty per year.
If I hire a US-based contractor, does that trigger ECI?
It depends on the nature of the relationship. A true independent contractor who works for multiple clients generally does not create ETBUS. A contractor working exclusively for your LLC under your direct control is more likely to be treated as a dependent agent, which can trigger ETBUS and ECI exposure.
Should I use an LLC or a C Corp if my business generates ECI?
If ECI is unavoidable, for example, you operate an e-commerce business with US inventory, a C Corp often produces a better outcome. ECI in a C-Corp is taxed at a flat 21% rate at the entity level, and salaries paid to foreign shareholders are not treated as US-source income. An LLC passes ECI to the foreign owner’s personal return. The right answer depends on your specific situation and is worth discussing with a CPA before deciding.