Pro Forma 1120: The Return That Carries Your Form 5472
Updated July 2026 · Reviewed by a Form 5472 specialist
Updated July 2026 · Reviewed by a Form 5472 specialist
The short answer
Key takeaways
A pro forma Form 1120 is a shell corporate tax return that a foreign-owned disregarded entity uses to carry Form 5472 to the IRS. The LLC completes only the identification block, writes “Foreign-owned U.S. DE” across the top, and leaves every income and tax line blank.
“Pro forma” is Latin for “as a matter of form” — the return exists to satisfy a procedural requirement, not to compute tax. Form 1120 is the standard US corporate income tax return. A pro forma 1120 is that same form used as a hollow shell: it identifies the entity to the IRS and nothing more.
Why does it exist at all? Because the regulations under IRC section 6038Arequire Form 5472 to be attached to an income-tax return, and a disregarded entity has no real return to file. The IRS’s solution is the pro forma 1120: a cover return that gives Form 5472 something to attach to. The entity completes the identification block, leaves every financial line blank, and the package is complete.
| Feature | Pro forma 1120 (disregarded entity) | Real Form 1120 (C-corporation) |
|---|---|---|
| Purpose | Cover sheet carrying Form 5472 | Computes corporate income tax |
| Identification block | Completed | Completed |
| Income lines (1–11) | Blank | Completed |
| Deduction lines (12–29) | Blank | Completed |
| Tax & payments (Schedule J) | Blank | Completed |
| Label written across top | 'Foreign-owned U.S. DE' | None |
| E-file possible? | No — mail or fax only | Yes |
Source: IRS Instructions for Form 5472 and Form 1120. Verified July 2026.
Complete only the page-1 identification block: legal name, US address, EIN (box B), date incorporated, and total assets (box D — often $0). Write “Foreign-owned U.S. DE” across the top and sign nothing else into existence: every income, deduction, and tax line stays blank.
The entire completion job fits in the top third of page 1. Founders routinely over-fill this form — entering revenue figures or signing up for schedules that do not apply — which turns a simple cover sheet into a contradictory return. Here is the whole map:
| Area | What to enter |
|---|---|
| Top margin | Write 'Foreign-owned U.S. DE' — the required label |
| Name | The LLC's exact legal name (as on the SS-4 confirmation) |
| Address | The LLC's US mailing address |
| Box B — Employer ID number | The LLC's EIN — required, no exceptions |
| Date incorporated | The formation date from the state filing |
| Box D — Total assets | Year-end total assets — frequently $0 for a startup or dormant LLC, and that is fine if true |
| Everything else | Leave blank — income, deductions, tax, payments, schedules |
Source: IRS Instructions for Form 1120 and Form 5472. Verified July 2026.
Two boxes cause the most anxiety. Box B (EIN): without it the package cannot be processed — apply on Form SS-4 well before the deadline. Box D (total assets): founders think a $0 looks wrong. It does not. A brand-new or dormant LLC genuinely holds little or nothing; report the true figure, even if it is zero.
Six steps: get the EIN, total the year's reportable transactions from a ledger, complete the 1120 identification block, complete Form 5472 behind it, assemble with the 1120 on top, then mail to Ogden or fax by April 15 and keep dated proof.
The pro forma 1120 and Form 5472 are one package, not two filings. The end-to-end sequence for a foreign-owned single-member LLC:
| Step | Action |
|---|---|
| 1 | Obtain the EIN (Form SS-4) — the blocker for everything after it |
| 2 | Total every reportable transaction from a simple ledger: contributions, loans, repayments, distributions |
| 3 | Complete the pro forma 1120 identification block; write 'Foreign-owned U.S. DE' across the top |
| 4 | Complete Form 5472 Parts I, II, III, V, and VI |
| 5 | Assemble: pro forma 1120 on top as the cover sheet, Form 5472 stapled behind it (one 5472 per related party) |
| 6 | Mail to 1973 Rulon White Blvd, M/S 6112, Attn: PIN Unit, Ogden, UT 84201, or fax 855-887-7737 by April 15 — keep the receipt |
Source: IRS Instructions for Form 5472; form5472.tax filing workflow. Verified July 2026.
Step 5 is where physical assembly matters: the 1120 always goes on top, because it is the return; Form 5472 is the attachment. If the LLC transacted with two related foreign parties, both Forms 5472 go behind the same single 1120. The full Form 5472 line walkthrough is on the Form 5472 instructions page.
The five mistakes are: forgetting the “Foreign-owned U.S. DE” label, missing theEIN, entering income figures that should stay blank, not attaching Form 5472 behind the 1120, and trying to e-file. Each makes the filing incomplete — treated as not filed, with the$25,000 penalty.
| Mistake | Why it hurts | Fix |
|---|---|---|
| No 'Foreign-owned U.S. DE' label | The IRS cannot route the shell return correctly | Write it across the top of page 1 |
| Missing EIN (box B) | Package cannot be processed | Get the EIN on Form SS-4 first |
| Entering income/deduction figures | Turns the shell into a contradictory return | Leave every financial line blank |
| Form 5472 not attached | The 1120 exists only to carry the 5472 | Staple the 5472 behind the 1120 |
| Trying to e-file | No e-file path exists for a foreign-owned DE | Mail to Ogden or fax 855-887-7737 |
Source: IRS Instructions for Form 5472; form5472.tax filing experience. Verified July 2026.
A substantially incomplete package is treated as not filed under IRC section 6038A — the same $25,000 exposure as never mailing anything. All five mistakes are mechanical, which is why a specialist review catches them every time.
No. A pro forma Form 1120 reports no income and computes no tax. A disregarded entity pays no entity-level federal income tax, so every tax line stays at zero. The form exists only to carry Form 5472 to the IRS.
This surprises many founders: the US corporate tax return is filed with no tax due. That is correct for a disregarded entity. The LLC is ignored for income tax — profits flow through to the foreign owner, who may or may not have US-source income to report separately. The entity itself owes nothing at the entity level, so the pro forma 1120 correctly shows zero everywhere.
Do not confuse “no entity tax” with “no obligation.” The Form 5472 attached behind the pro forma 1120 is a mandatory disclosure, and missing it triggers the $25,000penalty even though no tax was ever at stake. For the owner-level income question — when a non-resident actually owes US tax — see the effectively connected income guide.
The pro forma 1120 and Form 5472, prepared, reviewed, and filed as one correct package for a flat $299. Or message us first — we answer every question.