People use "pass-through taxation" as if it were one legal rule. It is not. It is a name for something three different parts of the tax code do in the same way: they skip taxing the company and tax the owner instead.
Founders usually meet the phrase when they are choosing between an LLC, an S corp, and a C corp. The choice matters because a C corp does the opposite. It pays tax at the entity level first, under IRC §11, and then the owner pays tax again on whatever is left when it is distributed. That second layer is what pass-through structures are built to avoid.
What the rule actually requires
There is no single statute called "pass-through taxation." Three separate rules produce the same result.
Partnerships. IRC §701 says the partnership itself does not pay income tax. Each partner does, based on their share of the partnership's income, whether or not any cash was actually paid out to them that year.
S corporations. IRC §1366(a)(1) says each shareholder reports "the shareholder's pro rata share" of the corporation's income, loss, deduction, and credit items on their own return. Same idea, different statute.
Disregarded entities. A single-member LLC that has not elected corporate tax treatment is ignored by the tax code entirely. 26 CFR §301.7701-3(b)(1)(ii) treats it as if it does not exist as a separate taxpayer. Its owner reports the LLC's income and expenses directly on their own return, as if they had earned the income personally.
All three routes land in the same place: no tax bill at the company level. The company files an information return, or nothing at all if it is disregarded, and the tax bill goes to the person.
Two things trip people up here. First, "pass-through" does not mean the income goes untaxed. It means the entity does not pay the tax. The owner still owes it, and in a multi-member partnership or an S corp, the owner can owe tax on income the company kept in the bank and never paid out. Second, an LLC is not automatically a pass-through. By default it is, but an LLC can file Form 8832 to elect corporate tax treatment instead, which turns it into a C corp for tax purposes even though nothing about the company's legal structure changes.
🇺🇸 If the IRS counts you as a U.S. person
Your LLC's profit, or your share of a partnership's or S corp's profit, flows onto your personal return. A single-member LLC's numbers go on your Schedule C, attached to your Form 1040. A partnership or S corp sends you a Schedule K-1 each year, and you report the number on that K-1 whether or not the company distributed the cash to you.
This is why founders get surprised by a tax bill on money still sitting in the business checking account. The company kept the profit to reinvest, but the K-1 still shows your share of it, and you owe tax on that share regardless of what the company did with the cash.
An S corp adds one more layer that a straight partnership or disregarded LLC does not have. If you work in the business, the IRS expects you to pay yourself a reasonable salary through payroll, and only the remaining profit passes through as a distribution. Skipping the salary to avoid payroll tax is a common audit trigger, not a loophole.
🌏 If it does not
The mechanism is the same. Your LLC, partnership, or S corp still does not pay tax at the entity level. What changes is what happens to your share of the profit once it reaches you.
The IRS sorts income you receive into two buckets, and which bucket you land in decides how it gets taxed. Income "effectively connected" with a U.S. trade or business, called ECI, is taxed at the same graduated rates a U.S. person pays, and you report it on Form 1040-NR instead of Form 1040. Income that is not connected to a U.S. trade or business, such as certain passive payments, can instead fall under the FDAP rules and get taxed by withholding at the source, often at a flat rate, before you ever see the money.
There is one route closed to you regardless of income type. IRC §1361(b)(1)(C) blocks a nonresident alien from being an S corp shareholder at all. The statute bars only nonresident aliens, so the test is whether the IRS treats you as a resident under the green card test or the substantial presence test. A U.S. citizen always qualifies, wherever they live, because a citizen is never an alien and the residency tests do not apply to them. A green card holder living outside the United States can also be an S corp shareholder, because the IRS counts them as a resident. The only person barred is an alien who meets neither residency test. If an S corp ends up with a disqualified shareholder, the election can terminate and the company gets treated as a C corp instead, which is expensive to unwind.
If you own a single-member LLC and it is disregarded for tax purposes, the pass-through mechanism itself does not change. What changes is the paperwork around it: a foreign-owned disregarded entity has to file Form 5472 along with a pro forma Form 1120, a filing a U.S.-owned disregarded LLC does not have to make at all.
Where the mechanism is the same and where it is not
| What you are asking | 🇺🇸 U.S. person | 🌏 Not a U.S. person |
|---|---|---|
| Does the company pay entity-level tax? | No | No |
| Where does the profit get reported? | Your Form 1040 (Schedule C or K-1) | Your Form 1040-NR, or withheld at the source |
| Can you be an S corp shareholder? | Yes | No — IRC §1361(b)(1)(C) |
| Single-member disregarded LLC extra filing | None beyond your own return | Form 5472 + pro forma Form 1120 |
| Does undistributed profit still get taxed to you? | Yes | Yes, for ECI. Depends on category for FDAP-type income |
The row that matters most is the first one. The core promise of pass-through taxation, that the entity itself is not the taxpayer, holds for both groups. Everything below that row is about what happens to the owner's share once it leaves the company, and that is where the two answers separate.
Common mistakes
🇺🇸 If the IRS counts you as a U.S. person
- Assuming a company that kept its profit owes nothing. The company owes nothing. You do, based on your K-1 or Schedule C share, whether or not you were paid.
- Running an S corp without paying yourself a salary, then treating the whole profit as a distribution to avoid payroll tax.
- Filing Form 8832 for corporate tax treatment without understanding that it undoes the pass-through result on purpose.
🌏 If it does not
- Assuming pass-through taxation means the same withholding rules apply to you as to a U.S. person. Whether your income counts as ECI or FDAP changes the tax rate and how it gets collected.
- Trying to be an S corp shareholder, or setting one up with a foreign owner, without checking IRC §1361(b)(1)(C) first. The election can fail or terminate.
- Forgetting the Form 5472 and pro forma Form 1120 filing for a foreign-owned single-member LLC. This filing exists specifically because you are not a U.S. person, and missing it carries its own separate penalty.
FAQ
Does pass-through taxation mean my company pays no tax at all?
It means the company does not pay tax at the entity level. The owner still owes tax on their share of the profit. The tax obligation moves from the company to the person, it does not disappear.
Is an LLC automatically a pass-through entity?
By default, yes, for both single-member and multi-member LLCs. But an LLC can file Form 8832 to elect corporate tax treatment, which makes it taxed like a C corp instead. Nothing about the LLC's legal structure changes when it does this, only the tax treatment.
Can a non-U.S. person own shares in an S corp?
No. IRC §1361(b)(1)(C) bars a nonresident alien from being an S corp shareholder. This is decided by your tax residency status, not your citizenship, so a green card holder living abroad can still qualify while a nonresident alien cannot.
If my LLC keeps its profit in the business bank account instead of paying me, do I still owe tax on it?
Yes, if the LLC is a partnership or a disregarded entity taxed on a pass-through basis. The tax follows your share of the profit as reported, not the cash you actually withdrew.
What is the difference between ECI and FDAP for someone who is not a U.S. person?
ECI is income effectively connected with a U.S. trade or business, taxed at the same graduated rates a U.S. person pays and reported on Form 1040-NR. FDAP covers certain other categories of U.S.-source income and is often taxed by withholding at the source at a flat rate before the payment reaches you. Which bucket your income falls into changes both the rate and how it gets collected.
Do I need to file anything extra because my single-member LLC is foreign-owned?
Yes. A foreign-owned single-member LLC that is disregarded for tax purposes still has to file Form 5472 along with a pro forma Form 1120, even though the LLC itself owes no income tax. A U.S.-owned disregarded LLC does not have this extra filing.
Does electing S corp status change how much tax I pay if I am a pass-through owner already taxed as a disregarded entity or partnership?
It can. An S corp requires you to run payroll and pay yourself a reasonable salary if you work in the business, with the remaining profit passing through as a distribution not subject to self-employment tax. A disregarded LLC or a general partner's share does not get that split, so the S corp election is sometimes chosen specifically to reduce self-employment tax exposure.