Form 5472 Mailing, Fax, and Assembly Guide for Foreign-Owned U.S. DEs (2025-2026)
Form 5472 reporting flow
How a foreign-owned single-member LLC reports its reportable transactions to the IRS.
Identify reportable transactions
Money in/out between the LLC and its foreign owner or related parties.
Prepare pro forma 1120 + 5472
Form 5472 attaches to a pro forma Form 1120 cover page.
File by the deadline
Mail or fax the package by the corporate return due date.
Keep records
Retain transaction records supporting every reported amount.
Key Takeaways
- Foreign-owned U.S. DEs use a special Form 5472 filing channel described in the Form 5472 instructions.
- These filers should not assume the ordinary Form 1120 filing lane applies.
- The packet should be assembled in a clear, coherent order.
- Save the exact transmitted version with proof of fax or mailing.
Foreign-owned U.S. disregarded entities do not follow the ordinary Form 1120 filing lane
This detail is easy to miss if you read only general Form 1120 instructions. The Form 5472 instructions carve out a separate filing path for foreign-owned U.S. DEs. They say these filers use a dedicated mailing address and may fax the filing to the dedicated number identified in the instructions, and they also state that these entities cannot electronically file Form 5472. That means a founder who relies on the usual corporate-return habits can get the delivery mechanics wrong before the substance is even reviewed.
Form 5472 filing procedure is part of compliance, not a clerical afterthought.
Assemble the packet so a reviewer sees one coherent filing, not loose pages
The package should read in order: pro forma Form 1120 cover page, attached Form 5472, and any necessary supporting explanations. If multiple related parties require multiple Forms 5472, that should be obvious from the assembly. The packet should also match the tax year and entity identity used everywhere else in the file. A disorganized submission increases the chance that a correct filing still creates later notice friction.
Founders should think like a records clerk for ten minutes before they think like a founder again.
Keep the sent version exactly as it was delivered
The cleanest tax files keep a PDF of the final packet, the fax confirmation or mailing proof, and an internal note showing when the package was transmitted. If the IRS later questions timeliness, the sent packet itself becomes part of the defense. A lot of filing pain comes from the founder having a draft but not the exact copy that actually went out.
The return should leave the building with an audit trail attached to it.
Frequently Asked Questions
Can a foreign-owned U.S. DE e-file Form 5472?
No. The current Form 5472 instructions say these filers cannot electronically file Form 5472.
Should a foreign-owned U.S. DE use the normal Form 1120 mailing address?
No. The Form 5472 instructions provide a dedicated filing path for these entities.
What is the most important record to save after sending the package?
Keep the exact filed packet plus proof showing when and how it was transmitted.
IRS Form 5472 Instructions
Official IRS source on irs.gov
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