US trade or business (USTB)

A US tax concept that triggers US income tax on income effectively connected with that trade or business.

Definition

US trade or business (USTB) is a key tax concept for non-resident-owned LLCs. If LLC operations rise to the level of a USTB, income effectively connected (ECI) with that USTB is subject to US graduated income tax. The IRS evaluates regularity, continuity, and substantiality.

Context

Most non-resident-owned single-member LLCs serving non-US clients do not have a USTB. Service work performed entirely outside the US is typically not USTB.

Example

A non-resident LLC owner doing remote consulting for European clients does not have a USTB. The LLC owns no US property, has no US employees, and conducts no US activity. No ECI; no US tax on the income.

Common pitfalls

US employees, US office, US warehouse, or substantial US-based activity can create USTB.
Amazon FBA inventory in US warehouses is a high-risk USTB-trigger area.
Once USTB exists, income tax filings become required.

Why the USTB question sits at the center of non-resident planning

For a non-resident who forms a single-member Delaware LLC, almost every important tax outcome flows from one threshold question: does the business rise to the level of a US trade or business. The reason this matters so much is that the entire US taxing framework for foreign persons branches at this point. On one side, income that is connected to a US trade or business gets taxed on a net basis at graduated rates, the same way a domestic operating business is taxed. On the other side, a foreign owner with no US trade or business and no fixed US-source passive income generally falls outside the US income tax net for that business activity. The label you land on changes which forms apply, whether tax is actually owed, and how much recordkeeping the year demands.

It helps to picture the question as a gate rather than a switch you flip on purpose. You do not elect to have a US trade or business. The IRS looks at what the business actually does and decides whether the pattern of activity is regular, continuous, and substantial enough to count. That is why two founders with identical Delaware paperwork can reach opposite answers. One sells software to clients in Germany from a laptop in Lisbon, and the other stores physical inventory in a Texas fulfillment center. The formation documents look the same, but the facts on the ground are not, and the facts are what govern.

Understanding this gate early protects you from two opposite mistakes. The first is assuming a Delaware LLC is automatically taxable in the US simply because it is American. The second is assuming it can never be taxable because the owner lives abroad. Both assumptions skip the analysis that actually decides the result, and both can lead to filing the wrong forms or missing required ones.

Reading the three-part test in plain language

The glossary entry notes that the IRS evaluates regularity, continuity, and substantiality. These are not statutory checkboxes with bright numeric lines, and that frustrates people who want a clean rule. Regularity asks whether the activity happens as a normal pattern rather than as an isolated event. A single one-off transaction usually does not create a trade or business, while a repeated, ongoing commercial pattern points the other way. Continuity asks whether the activity persists over time rather than appearing once and vanishing. Substantiality asks whether the activity is meaningful in scale and economic weight rather than trivial or incidental.

Because these are facts-and-circumstances factors, the analysis weighs the whole picture instead of any single element. A founder who occasionally answers an email from a US contact has not built a US trade or business out of that. A founder who runs a continuous, scaled commercial operation with a physical or human footprint in the US is in very different territory. The middle ground is where careful documentation matters most, because the answer there depends on the actual texture of operations rather than on a slogan.

A practical way to use the test is to write down, in concrete terms, where the income-producing work happens, who performs it, what physical assets touch the US, and how often. When you put those facts on paper, the regularity, continuity, and substantiality questions usually answer themselves. This is general information rather than tax advice, and a cross-border tax professional can apply the factors to your specific pattern.

Why service work performed outside the US usually stays outside the gate

The glossary context highlights a pattern that covers a large share of non-resident Delaware founders: service work performed entirely outside the US is typically not a US trade or business. The logic is that the place where the income-producing labor happens carries real weight. When a consultant, developer, designer, marketer, or writer sits in their home country and does the work there, the engine of the business is geographically outside the US even though the legal wrapper is a Delaware LLC and the payments may flow through a US bank account.

This is why the location of your bank, your registered agent, or your customers does not, by itself, pull you across the gate. A US business bank account at Mercury, Wise, Relay, Lili, or Payoneer is a place where money sits and moves. It is not where the service is performed. Likewise, having US-based clients who pay you for remote work does not automatically convert remote foreign labor into a US trade or business. The character of what you do and where you do it tends to matter more than where the counterparty is located, although the full analysis is fact-specific.

The takeaway is not that remote service founders are guaranteed to be outside US tax. It is that the most common low-footprint pattern, a single owner doing knowledge work abroad for clients who may be anywhere, usually lands on the non-USTB side. The strongest protection for that position is keeping clean records that show where the work physically happened and that no US office, staff, or dependent agent was involved.

How the disregarded-entity status interacts with the USTB analysis

A single-member LLC owned by a foreign person is, by default, a disregarded entity for US federal income tax. Disregarded means the IRS looks through the LLC to its owner for income tax purposes, treating the business as if the owner conducted it directly. This is why the USTB analysis is really about the owner. The question becomes whether the foreign owner, acting through the disregarded LLC, is engaged in a US trade or business. The LLC does not create a separate taxpayer that changes the answer.

This look-through has a clean consequence. If the owner's activity through the LLC is not a US trade or business and produces no fixed US-source income subject to flat withholding, the disregarded structure generally does not generate a US federal income tax liability on that business income. The income belongs to the foreign owner and is sourced according to where the work occurs. That is the structural reason so many remote founders end up owing no US income tax on their operations, even while running a legitimate American company.

It is worth separating this income tax point from the information reporting point, which is covered later. A foreign-owned single-member LLC can owe no income tax and still carry mandatory filing duties. Disregarded status simplifies the income tax picture, but it does not erase the paperwork that the IRS requires from these entities. Confusing the two is one of the most common and most expensive misunderstandings in this space.

A worked example: the remote agency owner

Consider a founder living in Argentina who forms a Delaware LLC for $110 in state filing fees and runs a small marketing agency. She works from Buenos Aires, hires two contractors who also live in Argentina, and serves clients in Spain, Mexico, and the US. She opens a US business account with Relay, invoices in US dollars, and pays herself by transferring funds abroad. The agency owns no US office, holds no US inventory, and has no employee or dependent agent operating inside the US.

Applying the gate, the income-producing work happens entirely outside the US. The presence of some US clients does not change where the labor occurs, and a US bank account is just a place to receive payment. On these facts the pattern usually does not amount to a US trade or business, so the agency income is generally not effectively connected income and not subject to US graduated tax. She still pays the $300 flat Delaware franchise tax due June 1 to keep the entity in good standing, and she still has US information reporting to handle, but the income tax outcome on her operations is typically nil.

Now change one fact. Suppose she opens a small US office and hires a salaried staff member in Miami who performs client work. That US-based human activity is exactly the kind of footprint the glossary pitfalls flag. It can push the operation across the gate into US trade or business territory, after which effectively connected income becomes taxable and income tax filings become required. The lesson is that a single structural choice can move the answer, so founders should map footprint decisions to the tax consequence before acting.

A worked example: the physical-product seller

Now take a founder in Pakistan selling consumer products through an online marketplace. He forms the same Delaware LLC, but his model depends on holding inventory in US fulfillment warehouses so orders ship quickly to American buyers. The glossary pitfalls call out marketplace fulfillment inventory in US warehouses as a high-risk area, and this example shows why. Goods physically sitting in the US, combined with a regular and substantial pattern of US sales, builds a far stronger argument that a US trade or business exists than the remote-services pattern does.

Why does inventory carry so much weight when a bank account does not. The difference is that inventory is a tangible income-producing asset located inside the US, and the sales activity around it can be continuous and substantial. The business is not just receiving payments in the US, it is conducting a goods operation with a US physical presence. That changes the character of the activity in a way the IRS factors take seriously. The position that no US trade or business exists becomes much harder to defend.

If a US trade or business is present, the founder should expect to deal with effectively connected income, net-basis taxation at graduated rates, and the corresponding income tax filings. This is precisely the scenario where engaging a cross-border tax professional before scaling is sensible, because the structure, sourcing, and filing obligations get materially more involved. The takeaway is not that product sellers cannot use a Delaware LLC. It is that the USTB analysis lands differently for them, and they should plan for it rather than discover it at filing time.

How USTB connects to effectively connected income

The reason the US trade or business question matters in dollars is its link to effectively connected income. Once a US trade or business exists, the next step is identifying which income is effectively connected with it. Effectively connected income is taxed on a net basis at graduated rates, meaning you can deduct related expenses and pay tax on the profit rather than on gross receipts. This net treatment is generally more favorable than the flat withholding regime that applies to certain fixed US-source passive income, but it only comes into play once the trade or business threshold is crossed.

The sequence is important and easy to garble. First you ask whether a US trade or business exists at all. Only if the answer is yes do you ask which income is effectively connected to it. A founder with no US trade or business does not reach the effectively connected income question for that business activity, which is why the most common remote-services pattern produces neither. The two concepts are linked but ordered, and skipping the first step leads people to worry about effectively connected income calculations they never actually face.

For deeper detail on the second step, the related entry on effectively connected income walks through how connected income is identified and taxed. The related entry on Form W-8ECI covers the certificate a non-resident provides to a payer when income genuinely is connected, so the payer can apply net-basis treatment instead of flat withholding. Reading those alongside this entry gives you the full chain from threshold to tax.

Permanent establishment and the treaty overlay

US trade or business is a domestic tax concept defined under US law. Sitting on top of it, for residents of countries that have an income tax treaty with the US, is the related concept of a permanent establishment. A permanent establishment is a treaty term that generally describes a fixed place of business or a dependent agent through which the enterprise carries on its activity. When a treaty applies, a foreign resident may be protected from US business profits tax unless the activity rises to a permanent establishment, which is often a higher bar than a bare US trade or business.

The practical effect is a two-layer screen. Under US domestic law you ask whether there is a US trade or business and effectively connected income. Under an applicable treaty you then ask whether there is a permanent establishment, because the treaty can reduce or eliminate US tax on business profits when no permanent establishment exists, even where a US trade or business technically might. Not every founder's home country has a US treaty, and treaty benefits usually require proper claiming, so this overlay does not apply uniformly. The related entry on permanent establishment covers the concept in more depth.

Because treaties differ country by country and benefit claims have their own procedures, this is an area where general information runs out quickly. A founder who thinks a treaty might shield business profits should confirm whether their country has a US treaty, read the relevant article, and get professional help to claim it correctly rather than assuming protection applies automatically.

Where USTB sits in the formation and setup sequence

It helps to see where this concept fits among the concrete steps a founder takes. Formation itself is a state act: you file the Certificate of Formation with Delaware for $110 and the entity exists. That step says nothing about US trade or business status, because it is purely about creating the legal wrapper. The franchise obligation is also state-level, with the $300 flat franchise tax due June 1 each year to keep the LLC in good standing. Neither of these state steps depends on or determines your federal income tax footprint.

The federal layer begins with the EIN, the employer identification number that the IRS issues for free when you file Form SS-4, which for non-residents without an SSN typically takes around 8 to 10 business days. The EIN lets you open banking and handle federal filings, but obtaining one does not create a US trade or business either. An EIN is an identifier, not a taxable presence. Founders sometimes worry that getting an EIN exposes them to US tax, and that conflates identification with the activity-based USTB test.

Banking comes next, with accounts commonly opened at Mercury, Wise, Relay, Lili, or Payoneer so the business can receive and send US dollars. As covered earlier, a US bank account is where money moves rather than where work is performed, so it does not by itself create a US trade or business. Seeing the sequence laid out this way makes the point concrete: forming, paying franchise tax, getting an EIN, and opening a bank account are all compatible with having no US trade or business at all.

USTB versus the mandatory reporting that applies regardless

One of the most important distinctions for non-resident founders is that information reporting can apply even when no US trade or business and no income tax exist. A foreign-owned single-member LLC treated as disregarded is generally required to file Form 5472 together with a pro forma Form 1120 to report reportable transactions between the LLC and its foreign owner, such as capital contributions and distributions. This filing is informational, but it is not optional, and the penalty for failing to file is $25,000, which is steep relative to the simplicity of the form.

The reason this matters here is that founders who correctly conclude they have no US trade or business sometimes wrongly conclude they have nothing to file. The income tax answer and the information reporting answer are separate. You can owe zero US income tax on your operations and still be required to file Form 5472 and the pro forma 1120 each year. Treating the absence of tax as the absence of obligation is exactly the trap that leads to the penalty.

So the clean mental model is two independent questions. Question one, do I have a US trade or business and effectively connected income that creates an income tax liability. Question two, do I have information reporting duties such as Form 5472 that apply because of my structure. For many remote founders the honest answers are no to the first and yes to the second. Keeping these separate in your planning prevents both overpaying tax you do not owe and skipping forms you do.

The BOI reporting status and what it does not change

Beneficial ownership information reporting under the Corporate Transparency Act was, for a period, a live concern for US LLC owners including non-residents. Under the FinCEN Interim Final Rule of March 26 2025, US-formed entities such as a Delaware LLC are exempt from the beneficial ownership information reporting requirement, which removed that particular filing for domestic entities. This is a meaningful simplification for founders who had been bracing for another federal report.

It is worth being precise about what this exemption touches and what it does not. The BOI status concerns a FinCEN ownership disclosure regime, not the income tax system. It has no bearing on whether you have a US trade or business, whether you have effectively connected income, or whether you owe income tax. Those questions live entirely in the tax analysis described throughout this entry. A founder should not read the BOI exemption as any kind of statement about their income tax position, because the two regimes are unrelated.

Likewise, the BOI exemption does not remove the Form 5472 and pro forma 1120 obligation, which is a separate IRS information return rather than a FinCEN filing. Founders sometimes hear that one federal report went away and assume all of them did. Keeping each regime in its own lane, state franchise, federal income tax, federal information reporting, and FinCEN ownership reporting, prevents that kind of cross-wiring.

Edge cases that move the analysis

Several patterns commonly shift founders toward a US trade or business conclusion, and recognizing them early is the point of mapping your footprint. Marketplace fulfillment inventory stored in US warehouses, as the glossary pitfalls flag, is a frequent trigger because it places income-producing goods inside the US alongside a continuous sales pattern. A US office, even a small one, and US-based staff or a dependent agent who habitually acts on the business's behalf are also classic footprint elements that strengthen the case for a US trade or business.

Other edge cases are subtler. A founder who spends extended time physically working inside the US, or who builds a team of US-resident workers performing core income-producing tasks, may find the labor location argument that protects pure remote founders no longer holds. Drop-shipping arrangements, US-based warehousing partners, and certain agency relationships can introduce US activity that the founder did not fully account for. Each of these is a facts question, and small structural choices can tip the result.

Because these edge cases are where reasonable people reach different conclusions, they are also where professional input pays off most. The general principle is consistent: the more income-producing activity, people, and physical assets you place inside the US, the harder it becomes to maintain a no-US-trade-or-business position. Founders who want to stay clearly on the non-USTB side tend to keep their operational footprint outside the US deliberately, and they document that footprint so the position is defensible.

Common misunderstandings to retire

The first misunderstanding is that a Delaware LLC is inherently a US-taxable business. It is not. Delaware governs the entity's existence and charges a $300 flat franchise tax due June 1, but the federal income tax outcome depends on the activity-based US trade or business test, not on the state of formation. A founder doing remote knowledge work abroad can run a fully compliant Delaware LLC and owe no US income tax on operations while still meeting state and information reporting duties.

The second misunderstanding is the mirror image: that living abroad guarantees no US tax forever. It does not. Place inventory in a US warehouse, open a US office, or build a US workforce, and the analysis can flip. The protection that remote founders enjoy comes from the location of their activity, not from their passport or their home address, so changing the activity changes the answer.

The third misunderstanding is treating zero income tax as zero filing. As covered, the Form 5472 and pro forma 1120 obligation with its $25,000 penalty can apply even with no US trade or business and no tax due. None of this is legal or tax advice, and the safest path for a founder whose facts sit anywhere near the gate is to confirm their position with a cross-border tax professional before assuming an outcome. The related entries on effectively connected income, permanent establishment, and Form 1040-NR fill in the adjacent pieces of this picture.

Related terms

Related glossary terms & guides

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