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What is a pro forma Form 1120? Definition for foreign-owned LLCs

What a pro forma Form 1120 is, why a foreign-owned single-member LLC files one with Form 5472, and which boxes to fill in.

Amel Ouchene, IRS PTIN holder and CPA Candidate. October 19, 2026, 2 min read

Form 1120 is the US corporate income tax return. A pro forma Form 1120 is the same form used as an envelope: it carries Form 5472 to the IRS, but reports no income and no tax.

Why a single-member LLC files a corporate form

A single-member LLC is normally ignored for US income tax (a disregarded entity). For Form 5472 purposes only, the regulations treat a foreign-owned one as a corporation. The Instructions for Form 5472 therefore ask it to file Form 5472 "with a pro forma Form 1120".

What to fill in

  • "Foreign-owned U.S. DE" written across the top.
  • The LLC's name and address.
  • Item B: the LLC's EIN.
  • Item E: "Initial return" in the first year, "Final return" if the LLC is dissolved.
  • Signature, date and title (for example "Sole Member").

Every numbered line and every other page stays blank. The instructions say the only information required on the Form 1120 is the name, address and items B and E.

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Go further

24 min read

Form 5472 Line-by-Line Guide for Foreign-Owned US LLCs

Learn how to fill out Form 5472 and pro forma Form 1120 for your foreign-owned single-member US LLC. Line-by-line guide, worked example, fax and mailing rules.

Read the guide23 min read

Missed Form 5472 for Past Years? Step-by-Step Catch-Up Guide

Missed Form 5472 filings? Discover how to catch up on late Form 5472 filing, prepare pro forma Form 1120, submit reasonable cause, and handle IRS penalties.

Read the guide

This article is general information about US tax rules for foreign-owned LLCs, not advice for your specific situation. Rules change; check the date above and ask before you file.