Pro Forma Form 1120 Explained (for Foreign-Owned LLCs)

TL;DR

A foreign-owned single-member LLC files Form 5472 attached to a “pro forma” Form 1120 — a mostly-blank 1120 used only as a cover sheet. It does not calculate corporate tax; it just carries the 5472 information return. The package is filed by mail or fax to the IRS, not e-filed.

What does “pro forma” Form 1120 mean?

“Pro forma” means the form is filed for form’s sake — as a shell, not a real corporate tax return. A foreign-owned single-member LLC is a disregarded entity, not a corporation, so it doesn’t actually owe or compute corporate income tax. But the IRS requires the Form 5472 information return to be attached to a Form 1120 — so a stripped-down “pro forma” 1120 is used purely as the cover.

What’s actually filled in?

On the pro forma 1120, generally only the basics:

• The LLC’s name, address, and EIN
• A notation that it is a foreign-owned disregarded entity filing under the §6038A / 5472 rules
• Most income and deduction lines are left blank

The substance is on the attached Form 5472, which reports the reportable transactions between the LLC and its foreign owner or related parties.

What the pro forma 1120 is NOT

• It is not a corporate income tax return. It does not calculate or report corporate tax for a disregarded LLC.
• It is not optional. The 5472 must be attached to a 1120 to be filed correctly — you can’t file the 5472 by itself.
• It is not e-filed. For a foreign-owned disregarded LLC, the 5472 + pro forma 1120 package is filed by mail or fax to Ogden, Utah. (A real C-corporation filing a genuine 1120 is different — that can be e-filed.)

How it’s filed

1. Prepare Form 5472 with the year’s reportable transactions.
2. Attach it to a pro forma Form 1120 (name, address, EIN, disregarded-entity notation).
3. Mail or fax the package to the IRS in Ogden, Utah by the deadline — April 15 for a calendar-year LLC, extendable to October 15 with Form 7004.
4. Keep proof of submission and the supporting records.

Because this is the exact package most foreign-owned LLCs owe every year, getting it right matters: missing or botching it triggers the $25,000 Form 5472 penalty. And remember — even a no-income LLC usually has to file it.

This article is general information, not tax or legal advice. Confirm the rules that apply to your specific situation before acting.