Single-Member LLC Taxes: The Disregarded Entity Explained

When you form a single-member LLC, the IRS does not see a new taxpayer by default. Under the check-the-box regulations, a domestic one-owner LLC is classified as a disregarded entityunless it elects otherwise. That means the entity files no income-tax return of its own — its income, deductions, and credits land on the owner’s personal return as if the LLC were a sole proprietorship.

Crucially, “disregarded” applies only to income tax. The LLC is still a real legal entity for liability, contracts, banking, and state law. It can still owe employment and excise taxes in its own name. This split — disregarded for income tax, respected for everything else — is exactly what trips up foreign owners, because a separate federal rule pulls the LLC back into the spotlight for reporting. See the full breakdown on single-member LLC as disregarded entity.

For a US owner, disregarded-entity status is simple and usually favorable. Business income flows to Schedule C, self-employment tax applies to net profit, and there is no second layer of corporate tax. The owner can later elect S-corporation or C-corporation treatment, but absent that election the default holds.

The contrast in the last two rows is the whole story: same disregarded status, completely different reporting obligation once the owner is foreign.

A foreign-owned single-member LLC stays a disregarded entity for income tax — it still owes no US income tax unless it has US-source effectively connected income. But Treasury closed a transparency gap in 2017: these LLCs are now treated as corporations solely for the §6038A reporting and record-keeping rules. The practical effect is a brand-new annual filing that did not exist for these entities before.

That filing is a pro forma Form 1120 — a near-blank corporate shell that exists only to carry Form 5472 — plus the Form 5472 itself. The LLC needs its own EIN to file. Read the deeper treatment on foreign-owned disregarded entity and how the shell return works on pro forma 1120.

The single biggest misconception is that a zero-revenue LLC has nothing to report. Form 5472 is triggered by money or value moving between the LLC and its foreign owner or related parties — and forming and funding the LLC is exactly that kind of movement. So even a dormant, money-losing LLC almost always crosses the threshold in its very first year.

We never say every LLC must file no matter what — but because funding the LLC counts, almost all foreign-owned SMLLCs do. The law itself sits in IRC §6038A, explained on our IRC Section 6038A guide.

There is no electronic path for a foreign-owned disregarded entity. The package — a pro forma 1120 marked with the entity’s name and EIN, plus a completed Form 5472 — must be sent by mail or fax, and it must arrive by the deadline. Keep your certified-mail receipt or fax confirmation as proof you filed on time.

If you would rather not handle the mailing and the line-by-line form yourself, you can apply to have us file it for you.

The due date is the 15th day of the 4th month after the tax year ends — April 15 for a calendar-year LLC. Because a disregarded entity has no entity-level income tax to pay, Form 7004 simply extends the time to file the information return; there is no balance due and nothing to estimate. The extension still has to be postmarked or faxed by the original deadline.

Form 5472 carries one of the steepest information-return penalties in the code, and disregarded-entity owners are hit hardest because they often did not know the form existed. With no statute of limitations on an unfiled information return, a year missed long ago can still be assessed today, and the clock never starts running until the form is filed.

We prepare and file the form correctly so it never gets to that point; we do not offer penalty-abatement or IRS representation. Compare filing options on our pricing page.

Many new owners conflate the FinCEN beneficial-ownership (BOI) report with Form 5472, but they come from different laws and different agencies. After the March 2025 interim final rule, a US-formed LLC — even one owned entirely by a non-US person — no longer files a BOI report at all. Only entities formed abroad and registered to do business in the US (foreign reporting companies) remain in scope.

What stays the same

None of that changes your Form 5472 duty. The IRS information return under §6038A is independent of FinCEN rules, so a foreign-owned single-member LLC still files Form 5472 with its pro forma 1120 every year it has a reportable transaction. See what changed on the form itself in our 2026 instructions update.