IRS Form 5472 & Pro-Forma 1120 Filing Blueprint for Foreign-Owned Single-Member US LLCs (2026)

Every United States single-member Limited Liability Company (LLC) that is classified as a disregarded entity for federal income tax purposes and is owned—directly or indirectly—by a foreign person or foreign corporation must file IRS Form 5472 (Information Return of a 25% Foreign-Owned U.S. Corporation or a Foreign Corporation Engaged in a U.S. Trade or Business) attached to a pro-forma Form 1120 every tax year. Under Treasury Decision 9796 and Internal Revenue Code (IRC) Section 6038A, this filing is mandatory even if the LLC earned $0 USD in revenue, held no US clients, and owes $0 USD in US federal income tax. Failure to file a complete and timely return by April 15 (or October 15 on extension) results in an automatic $25,000 USD statutory civil penalty.

Who Must File Form 5472 & Pro-Forma 1120 in 2026?

To determine whether your US entity falls under the IRC § 6038A disregarded entity reporting mandate, evaluate three statutory criteria:

1. Disregarded Entity Classification: The entity is a domestic single-member LLC organized in any US state (such as Wyoming, Delaware, New Mexico, or Florida) that has not elected to be taxed as a C-Corporation via IRS Form 8832. (Note: Multi-member LLCs with two or more owners default to partnership taxation and file Form 1065 + Schedules K-1/K-2/K-3 instead of a pro-forma 1120).
2. 100% Foreign Ownership: The single member is a non-US citizen and non-US tax resident (neither a Green Card holder nor meeting the 183-day Substantial Presence Test), or is a foreign corporation/holding company organized outside the United States.
3. At Least One Reportable Transaction During the Tax Year: Any exchange of money or property between the foreign owner and the LLC—including paying the $100 USD state formation fee, funding a Mercury or Relay bank account, paying a $60 USD annual report fee from a personal card, or withdrawing profits to a personal account—triggers the filing obligation.

Line-by-Line Execution Blueprint: Pro-Forma Form 1120

Because a foreign-owned single-member LLC is treated as a corporation solely for IRC § 6038A reporting, the IRS requires a “cover sheet” Form 1120 (U.S. Corporation Income Tax Return) with severely restricted fields:

Line-by-Line Execution Blueprint: IRS Form 5472 (3 Pages)

Attach completed Form 5472 directly behind the single-page pro-forma Form 1120:

• Part I (Reporting Corporation): Enter the LLC’s name, address, and EIN. On Line 1c (Total assets), enter the year-end USD balance held in the LLC’s business bank accounts plus any tangible assets. On Line 1d & 1e, enter principal business activity and NAICS code (for example, 541511 for custom software development or 541610 for management consulting). On Line 1f, enter 1 (or total number of Form 5472s attached) and aggregate dollar value of gross payments. Ensure Box 3 (“Check here if this is a foreign-owned U.S. DE”) is checked.
• Part II (25% Foreign Shareholder): For a foreign-owned disregarded entity, Part II is frequently left blank or filled identically to Part III depending on software conventions, though IRS instructions specify completing Part III for the foreign owner related party.
• Part III (Related Party Information): Check “Foreign person,” enter the sole owner’s full legal name, foreign residential street address, country of citizenship, and country where the owner files personal income taxes (Line 1f).
• Part IV (Monetary Transactions Between Reporting Corporation and Foreign Related Party): Unless the foreign owner billed the LLC for formal management services or interest-bearing loans, most capital contributions and owner draws by a disregarded entity are reported via Part V rather than Part IV.
• Part V (Reportable Transactions of a Foreign-Owned U.S. Disregarded Entity): Check the box in Part V and attach a separate schedule titled “Attachment to Form 5472, Part V — Schedule of Reportable Transactions” detailing two exact USD totals: (1) Total Capital Contributions Paid by Foreign Owner to LLC (including formation fees, capital injections, and expenses paid personally), and (2) Total Distributions Paid by LLC to Foreign Owner (owner draws and personal reimbursements).
• Part VI (Nonmonetary and Less-Than-Full Consideration Transactions): Check “Yes” if the foreign owner transferred intellectual property, domains, or equipment without cash consideration, and attach a narrative description.

2026 Fax & Certified Mail Submission Coordinates

Do not mail a foreign-owned disregarded entity pro-forma 1120 to standard domestic corporate tax centers. Submit via one of the two dedicated IRS channels:

• Dedicated IRS Fax Line (Recommended for Timestamped Confirmation): Fax to +1 (855) 887-7737 (300 DPI minimum, max 100 pages). Retain the fax transmission confirmation page showing “OK” and page count as legal proof of timely filing.
• Dedicated IRS International Mail Address: Internal Revenue Service, 1973 Rulon White Blvd, M/S 6112, Attn: PIN Unit, Ogden, UT 84201 USA. Always use USPS Certified Mail with Return Receipt or DHL/FedEx Designated Private Delivery Services (PDS).