Single-Member LLC as Disregarded Entity: Tax Filing Guide

When you form an LLC with one owner, the federal default classification is automatic: the LLC is a disregarded entity. You do not file anything to make this happen — it is the built-in result of the check-the-box regulations (Treas. Reg. §301.7701-3). The IRS simply looks through the LLC to its owner and taxes the owner directly.

The LLC remains a fully real company under state law: it has its own name, its own bank account, and limited-liability protection that separates your personal assets from business debts. The “disregarded” label applies only to federal income tax — the IRS chooses to ignore the entity layer and tax the human (or company) behind it.

How to change the default

The owner can override the default by filing Form 8832 to elect C-corporation treatment (or Form 2553 for S-corporation status, available only to US owners). Until that election is made, the single-member LLC stays disregarded. The vast majority of owners — and nearly all non-residents — never make the election.

For a US owner, the tax picture is simple. The LLC's profit is the owner's profit. It goes on Schedule C (for a trade or business) attached to the owner's Form 1040. The owner pays ordinary income tax on the net profit and, usually, self-employment tax (Social Security and Medicare) on the earnings. The LLC itself files no federal income tax return.

For a non-resident owner, the entity still owes no federal income tax if it has no US trade or business income — but the Form 5472 reporting obligation applies regardless. The tax may be zero; the filing duty is not.

This is where a foreign-owned single-member LLC parts ways with a US-owned one. Final regulations under T.D. 9796, effective for tax years beginning on or after January 1, 2017, treat a foreign-owned disregarded entity as a separate corporation solely for the reporting rules of IRC section 6038A. The LLC stays disregarded for income tax but becomes a “reporting corporation” that must file Form 5472.

The form is required whenever the LLC had a reportable transaction with its foreign owner or a related party. The definition is broad enough to catch nearly every new LLC: contributions to and distributions from the entity count, so the deposit you make to fund the LLC is itself a reportable transaction. There is no minimum dollar threshold.

Because forming and funding the LLC almost always moves money from the owner, the practical answer for a foreign-owned single-member LLC is nearly always yes — you must file. The dedicated guide to the foreign-owned disregarded entity covers the mechanics in full.

Form 5472 cannot be filed alone; it must ride on a tax return. For a disregarded entity, the only available return is a pro forma Form 1120 — a cover sheet, not a real tax computation. The LLC completes only the identifying block at the top of page 1 (name, US address, EIN, date and state of formation), writes “Foreign-owned U.S. DE” across the top, and attaches Form 5472. Every income and tax line stays blank.

The package is mailed to P.O. Box 149342, Austin, TX 78714-9342, or faxed to 855-887-7737. There is no e-file option for this filing.

Whether a single-member LLC needs an EIN depends on its activities and its owner. A US owner with no employees and no excise-tax duties can technically use their own SSN for the LLC. But a foreign-owned single-member LLC must have its own EIN to file the required Form 5472 package — the EIN is the entity's identifier on both the pro forma 1120 and Form 5472.

A non-resident with no SSN or ITIN cannot apply online. They complete Form SS-4 and submit it by fax (faster — usually a few business days) or mail(several weeks), entering “Foreign” on line 7b where a US tax ID would go. Because the EIN is a prerequisite for filing, apply as soon as the LLC is formed.

The Form 5472 penalty does not care that the LLC earned nothing. It is triggered by the failure to file, not by unpaid tax. The base penalty is $25,000 per Form 5472 not filed, filed late, or filed substantially incomplete — for each year. There is no cap and no statute of limitations, so an old missed year can still be assessed.

The penalty also compounds: after the IRS sends a notice and 90 days pass without filing, an additional $25,000 applies for each 30-day period the failure continues. If you have missed one or more years, filing the back years promptly is the most effective way to cap exposure.

For a flat $299, form5472.tax prepares Form 5472 and the pro forma Form 1120 for your single-member LLC, has a specialist review it, and files it correctly — saving $248 versus form5472.online and up to $1,700 versus doola.