The Special DE Mailing Address Versus General Form 1120 Filing Addresses

The practical answer

Finding an address under Form 1120 does not settle where a special DE information-reporting packet belongs. Review the applicable filing procedure before addressing the envelope so that a familiar ordinary-return address does not displace the route prescribed for this package. Attach Form 5472 for every reportable related party, with the applicable schedules, to the pro forma Form 1120 and submit through the special DE route.^{[1, p.2] [1, p.3]}

Scope and the records behind the answer

The discussion follows the entity, form and transaction conditions identified below. The same label on a different form can have a different purpose. Keep the relevant entity and reporting period visible while you compare the requirements, and treat each stated exception as part of the rule rather than an optional footnote.

Official sources checked: 2026-11-09. Annual tax-year forms and continuously revised forms are identified separately in the references.

A side-by-side preparation table

Work through the official requirements

De mail route

A foreign-owned U.S. DE uses the special PIN Unit mailing route in the Form 5472 instructions, rather than the ordinary Form 1120 mailing addresses.^{[1, p.2]}

This applies when: Applies to the Form 5472/pro forma Form 1120 package for a foreign-owned U.S. DE.

De no efile

A foreign-owned U.S. DE cannot electronically file Form 5472. Use an accepted submission method in the special instructions.^{[1, p.3]}

This applies when: Foreign-owned U.S. disregarded entity.

Proforma only fields

The special pro forma Form 1120 instructions for a foreign-owned U.S. DE require its name and address and items B and E on the first page. Do not automatically expand this into the full income-tax return for an ordinary C corporation.^{[1, p.2]}

Field/section Attachment: Form 5472 attached

Attach Form 5472 for every reportable related party, with the applicable schedules, to the pro forma Form 1120 and submit through the special DE route.^{[1, p.2]}

De fax route

For the foreign-owned U.S. DE filing package, the Form 5472 instructions permit faxing to 855-887-7737 at 300 DPI or higher, or using the special mailing address in those instructions.^{[1, p.2]}

This applies when: Applies to the Form 5472/pro forma Form 1120 package for a foreign-owned U.S. DE.

Foreign owned de special route

A foreign-owned U.S. disregarded entity extending its Form 5472/pro forma 1120 package uses the Form 1120 code on line 1, writes Foreign-owned U.S. DE across the top and follows the special fax or mailing route in the Form 5472 instructions, rather than ordinary Form 7004 addresses.^{[1, p.3] [1, p.2] [2, p.1]}

This applies when: The filer is a foreign-owned U.S. disregarded entity. The extension concerns its Form 5472/pro forma 1120 package.

Field/section Top annotation: Foreign-owned U.S. DE

Write "Foreign-owned U.S. DE" across the top of the pro forma Form 1120 to identify this special filing.^{[1, p.2]}

Field/section Address: Number and street. If a P.O. box, see instructions.

Enter the DE's complete address, including the applicable room or suite, city, state or province, country and postal-code fields shown on the form.^{[3, p.1] [1, p.2]}

Field/section E(4): Address change

Use the applicable item E box when the address changed. This does not replace a separate address-change procedure that is required.^{[3, p.1] [1, p.2]}

An illustrative preparation scenario

In this hypothetical preparation example, a preparer has a general Form 1120 mailing checklist and a foreign-owned DE packet on the same desk. Before addressing the package, the review identifies which instructions govern this entity and compares the proposed recipient with the special route in those instructions. The preparer checks three points: Which procedure governs this DE package? Is the proposed address the special recipient listed there? Has a general 1120 address been used by mistake? The file remains a working comparison until the relevant facts and applicable instructions have been checked together. No agency outcome is assumed.^{[1, p.2] [1, p.3]}

This is a planning illustration, not a statement that a particular filing has been accepted or that an entity qualifies for a tax result. Use the source-backed distinctions above to decide what information still needs to be established before a form is completed.

A review sequence you can actually use

1. Which procedure governs this DE package?
2. Is the proposed address the special recipient listed there?
3. Has a general 1120 address been used by mistake?

Write down the answer and the record that supports it, rather than marking a question complete because a field contains text. When two records disagree, identify whether the difference concerns the entity, an individual, the reporting period or the type of change. That makes the remaining question specific enough to resolve against the relevant instruction.

Keep the scope of a preparation service separate from the government requirement. A service intake question may gather information for a workflow; it does not create an exception, extend a deadline or determine whether a transaction is reportable. The cited government material remains the basis for those conclusions.

Questions to settle before moving forward

How should I check proforma only fields?

The special pro forma Form 1120 instructions for a foreign-owned U.S. DE require its name and address and items B and E on the first page. Do not automatically expand this into the full income-tax return for an ordinary C corporation. ^{[1, p.2]}

How should I check field/section attachment: form 5472 attached?

Attach Form 5472 for every reportable related party, with the applicable schedules, to the pro forma Form 1120 and submit through the special DE route. ^{[1, p.2]}

How should I check de fax route?

For the foreign-owned U.S. DE filing package, the Form 5472 instructions permit faxing to 855-887-7737 at 300 DPI or higher, or using the special mailing address in those instructions. Applies to the Form 5472/pro forma Form 1120 package for a foreign-owned U.S. DE.^{[1, p.2]}

How should I check foreign owned de special route?

A foreign-owned U.S. disregarded entity extending its Form 5472/pro forma 1120 package uses the Form 1120 code on line 1, writes Foreign-owned U.S. DE across the top and follows the special fax or mailing route in the Form 5472 instructions, rather than ordinary Form 7004 addresses. The filer is a foreign-owned U.S. disregarded entity. The extension concerns its Form 5472/pro forma 1120 package.^{[1, p.3] [1, p.2] [2, p.1]}

Official sources and versions

1. Instructions for Form 5472 (Rev. December 2024) — Rev. December 2024
2. Form 7004 (Rev. December 2025) — Rev. December 2025
3. 2025 Form 1120

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