If you own a U.S. single-member LLC as a foreign individual, you have likely encountered two IRS forms that appear unrelated at first glance: Form 5472 and Form 1120. They are not unrelated. They are two halves of a single mandatory filing package and submitting one without the other is a compliance failure that triggers a $25,000 penalty.
This guide explains exactly how Form 5472 and the pro forma Form 1120 connect, why the IRS requires them together, and how to assemble the package correctly.
Two Forms, Two Distinct Roles
Understanding the relationship starts with understanding what each form actually does.
The Pro Forma Form 1120: The Cover Sheet
A standard Form 1120 is a U.S. Corporation Income Tax Return. But when a foreign-owned disregarded entity (DE) files it, the form serves an entirely different purpose. It is not a tax return. It is a carrier document a recognizable IRS form that gives the agency a structured way to receive and process Form 5472.
Per the IRS Instructions for Form 5472 (December 2024), only a minimal set of fields must be completed on this cover sheet:
- The LLC’s name and address
- Item B on the first page (Employer Identification Number)
- Item E on the first page (total assets)
- The label “Foreign-owned U.S. DE” written across the top of the form
Every other field on Form 1120 is left blank. The IRS is explicit: this document exists solely to route the attached Form 5472 through its processing system.
Form 5472: The Information Return
Form 5472 is where the substantive reporting happens. Its official title Information Return of a 25% Foreign-Owned U.S. Corporation or a Foreign Corporation Engaged in a U.S. Trade or Business signals its purpose: to report reportable transactions between the U.S. LLC and its foreign owner or related parties.
Reportable transactions include:
- Monetary transactions (Part IV): sales, rents, royalties, loans, interest, and other payments where money was the sole consideration
- DE-specific transactions (Part V): contributions, distributions, and amounts tied to the formation, acquisition, or dissolution of the entity
- Nonmonetary transactions (Part VI): exchanges involving property, services, or less-than-full consideration
For foreign-owned U.S. DEs, Part V is especially important. It captures transactions that standard U.S. corporations are not required to report such as initial capital contributions from the foreign owner or distributions back to them. Filing Part IV alone, while leaving Part V incomplete, constitutes a substantially incomplete return, which the IRS treats the same as a failure to file.
Why These Two Forms Must Be Filed Together ?
A single-member LLC is a disregarded entity for U.S. federal income tax purposes. That means the LLC itself has no separate income tax return obligation its income and expenses flow through to the owner. Under normal circumstances, the LLC files nothing at all.
However, IRS regulations under Section 6038A changed this for foreign-owned DEs. Effective for tax years beginning on or after January 1, 2017, a foreign-owned U.S. DE is treated as a separate entity classified as a domestic corporation but only for the limited purpose of satisfying Section 6038A reporting requirements.
The practical consequence: the LLC must report its transactions with the foreign owner, but it has no income tax return to attach that report to. The pro forma Form 1120 solves this problem. It provides a familiar corporate return structure that the IRS can log and process, with Form 5472 attached as the actual required disclosure.
This combination is the IRS’s official mechanism for a non-taxable entity to submit a mandatory information return. The IRS Instructions for Form 1120 (2025) confirm this directly: “a DE covered by these rules is required to file a pro forma Form 1120 with Form 5472 attached by the due date (including extensions) of the return.”
One further constraint applies here: foreign-owned U.S. DEs cannot file Form 5472 electronically. The package must be submitted by mail or fax only.
Step-by-Step: Assembling the Filing Package
Step 1: Complete Form 5472 First
Begin with the substance of the filing before preparing the cover sheet.
- Part I – Enter the LLC’s information and check the box on Line 3 confirming that the filer is a foreign-owned U.S. DE
- Part II – Report the foreign owner’s information (treated as the 25% foreign shareholder); include a Foreign Taxpayer Identification Number (FTIN) if one exists
- Part III – Identify the related party with whom reportable transactions occurred
- Part IV – Document all monetary transactions with the foreign related party
- Part V – Check the box and attach a statement describing any formation, dissolution, contribution, or distribution transactions not already captured in Part IV
- Part VI – Describe any nonmonetary or less-than-full consideration transactions
Accuracy is critical throughout. Filing a substantially incomplete Form 5472 is treated as a failure to file under IRS penalty rules meaning the $25,000 penalty applies even if a form was submitted.
Step 2: Prepare the Pro Forma Form 1120
With Form 5472 complete, prepare the cover sheet:
- Write “Foreign-owned U.S. DE” across the top of Form 1120
- Enter the LLC’s legal name and address
- Complete Item B (EIN) and Item E (total assets)
- Leave all remaining fields blank
- Do not use the standard mailing address listed in the Form 1120 instructions foreign-owned U.S. DEs use a dedicated submission address (see Step 3)
Step 3: Combine and Submit as One Package
Attach Form 5472 directly behind the pro forma Form 1120. These two documents form a single submission. They are not filed separately.
Submit the combined package using the dedicated IRS address for foreign-owned U.S. DEs:
By Fax (300 DPI or higher):
855-887-7737
By Mail:
Internal Revenue Service
1973 Rulon White Blvd
M/S 6112 Attn: PIN Unit
Ogden, UT 84201
Do not use the standard Form 1120 mailing addresses. The IRS Instructions for Form 5472 are explicit on this point: these filers must use the dedicated address above, not the address listed in the general Form 1120 instructions.
Filing deadline: The package is due by the due date of the pro forma Form 1120, including any extensions. If you need additional time, file Form 7004 by the regular due date, entering the Form 1120 code on Part I, Line 1, and writing “Foreign-owned U.S. DE” across the top. Form 7004 must be sent to the same dedicated address.
Compliance Starts With Understanding the Structure
Form 5472 and the pro forma Form 1120 are not independent documents. They are two components of a single IRS-required filing package. Form 5472 carries the substantive disclosure; the pro forma Form 1120 delivers it. Neither works without the other.
For foreign-owned U.S. LLCs, this filing requirement is mandatory, annual, and carries significant financial consequences for non-compliance. If you have questions about whether your LLC’s transactions qualify as reportable, how to complete Part V correctly, or how to avoid a $25,000 penalty, working with a CPA experienced in international tax compliance is the most reliable way to ensure your filing is complete, accurate, and on time.
Parth Shah, Managing Director
(CPA-US, FCA, RV-S&FA, DISA)
Parth Shah who is head of Accounts and Book keeping has experience of more than 10 years. A Certified Public Accountant – US, fellow Chartered Accountant, Registered Valuer and Diploma in Information System Audit.
