Pro Forma 1120: What It Is and Every Field You Complete
Summary
A Pro Forma 1120 is a Form 1120 filed as a cover sheet for Form 5472. It computes no tax. Only the name and address block, Item B and Item E are completed. Everything else stays blank.
If you are filing Form 5472 for a foreign-owned single-member LLC, you also file a "Pro Forma 1120." The term confuses most foreign founders, because Form 1120 is the US corporate income tax return and a single-member LLC is not a corporation.
The short version: the Pro Forma 1120 is a Form 1120 used as a transmittal cover sheet. It computes no tax. It exists to give Form 5472 a return to attach to. Most of it stays blank, and an incomplete one can trigger the same $25,000 penalty as a missing Form 5472, because the IRS treats the two as a single packet.
Why it is called "pro forma"
"Pro forma" is Latin for "as a formality." In tax practice it signals a document filed to satisfy a procedural requirement rather than to compute a substantive result.
A Pro Forma 1120 has the structure of Form 1120 but is filed without completing the income, deduction, or tax computation sections. Founders who encounter the term often assume the LLC owes corporate tax because Form 1120 is involved. It does not. The "pro forma" designation is precisely what signals that no tax is being computed.
Why a disregarded entity files a corporate return at all
A foreign-owned single-member LLC is a disregarded entity under Treas. Reg. §301.7701-3. The LLC is not separately a taxpayer; its activities flow through to the foreign owner.
In 2017 the IRS issued Treas. Reg. §301.7701-2(c)(2)(vi), creating a narrow exception: for purposes of §6038A reporting, and only for that purpose, foreign-owned US single-member LLCs are treated as corporations. This brought them inside the §6038A regime that already applied to 25% foreign-owned US corporations.
That regime requires Form 5472 to be attached to a Form 1120. Since the LLC has no income tax to compute, the Form 1120 is filed in pro forma fashion, with identifying information only. The IRS preserved the existing attachment structure so foreign-owned LLCs would route through the same processing channels, without requiring them to compute tax they do not owe.
The practical consequence: the Pro Forma 1120 is a transmittal device, not a tax computation. Founders new to the requirement often spend hours trying to work out what belongs on the income lines. The answer is nothing.
Which fields you actually complete
Per the IRS Instructions for Form 5472, the only information required on the Pro Forma 1120 is the name and address of the foreign-owned US DE, plus Items B and E on page 1. Everything else is left blank.
| Field on Form 1120 | Complete it? | What goes in it |
|---|---|---|
| Heading, top of page 1 | Yes | Write "Foreign-owned U.S. DE" across the top. Add the fiscal year dates on the heading line if the LLC does not use the calendar year. |
| Name and address block | Yes | The LLC's full legal name exactly as it appears on the EIN assignment letter and Form 5472 Part I, Line 1a, with the US business address matching Form 5472 Part I. |
| Item A | No | Covers consolidated return, personal holding company, personal service corporation and the Schedule M-3 indicator. None apply to a foreign-owned single-member LLC. |
| Item B - Employer Identification Number | Yes | The LLC's EIN exactly as issued. |
| Item C - Date incorporated | Optional | Not required. If you complete it, it should match the formation date used on Form 5472. |
| Item D - Total assets | Optional | Not required. If you complete it, it should match Form 5472 Line 1c. Complete both C and D or neither, so the figures never disagree. |
| Item E - Initial, Final, Name change, Address change | If applicable | Check whichever applies. Left blank for an ongoing year with no changes. |
| Income, deduction, tax and payment lines | No | The LLC reports no income and computes no tax on this form. |
| Schedules C, J, K, L, M-1, M-2, M-3 | No | All left blank. |
| Signature block | Yes | Sign and date. The foreign owner signs as Owner, Member or Sole Member, with the full legal name printed. |
An LLC without an EIN cannot file. Foreign owners apply on Form SS-4 by mail or fax; the online EIN application is not open to applicants without a US taxpayer ID.
One nuance on Final return: Form 5472 is still required for the final year, covering transactions through the dissolution date. Nothing is due after that.
Foreign-owned disregarded entities cannot e-file or sign electronically, so the packet has to be printed and signed by hand. Leave "Paid Preparer Use Only" blank on a self-prepared return.
If the foreign owner has US-source effectively connected income, that is reported on the owner's Form 1040-NR, not here.
Attaching only page 1 and attaching the full form with schedules blank are both accepted. The IRS instructions do not require omitting them.
A filled Pro Forma 1120, using one LLC's real figures
The table above says which fields to complete. It is worth seeing one completed, because the surprising part is not what you write, it is how little of it there is.
Northwind Systems LLC is a Wyoming single-member LLC formed in March 2024 and owned entirely by one individual resident in Portugal. During 2025 the owner put $18,000 of working capital into the LLC and the LLC paid the owner $42,500 for services. At 31 December 2025 the LLC held $6,300 in its US bank account. Here is the filer's entire Pro Forma 1120 for that year.
| Field on page 1 | What this filer writes |
|---|---|
| Heading, top of the form | "Foreign-owned U.S. DE" written across the top |
| Tax year line | Nothing. The pre-printed calendar year covers it, because this LLC uses the calendar year |
| Name | Northwind Systems LLC, exactly as it appears on the EIN assignment letter |
| Address | The LLC's US business address, matching Form 5472 Part I |
| Item A | Blank |
| Item B, EIN | The LLC's EIN as issued |
| Item C, date incorporated | Blank |
| Item D, total assets | Blank. NOT the $6,300 |
| Item E | Blank. 2024 was the initial return year, and the LLC is not dissolving |
| Lines 1a to 11, income | Blank |
| Lines 12 to 29, deductions | Blank |
| Lines 30 to 36, tax and payments | Blank |
| Signature block | Signed and dated by hand. Paid Preparer Use Only stays blank on a self-prepared return |
Read down the right-hand column and notice what is not there. The $18,000, the $42,500 and the $6,300 appear nowhere on this form. Not one dollar figure does. The two transaction amounts are reportable transactions and they belong on Form 5472 Part IV, which is the substantive half of the packet: what counts as a reportable transaction covers which of a filer's movements have to be listed there.
The $6,300 is the one worth dwelling on, because Item D is the field most often filled in by mistake. On an ordinary Form 1120 total assets is exactly where a year-end bank balance goes, so a filer who has prepared a corporate return before fills it in from habit. Here it stays blank, along with Item A and Item C, because the IRS Instructions for Form 5472 ask only for the name and address plus Items B and E.
Two fields carry real consequences if they are wrong rather than blank. The name has to match the EIN assignment letter and Form 5472 Part I Line 1a character for character, because a mismatch is what makes a filed packet hard to match to the entity later. And the EIN has to exist before you file at all: getting an EIN with no SSN or ITIN walks through the Form SS-4 route, which is slower than founders expect and is the single most common reason a first filing misses its deadline. Once both forms are complete, where to send the packet has the current fax number and mailing address.
What the Pro Forma 1120 does not do
It does not compute US corporate tax. Foreign-owned single-member LLCs are not subject to US corporate tax, because they remain disregarded entities for general tax purposes.
It does not report business income. Income, if any, is reported by the foreign owner on Form 1040-NR for effectively connected income, or not at all where the LLC is a transparent vehicle for foreign-source income.
It does not satisfy any state filing. Wyoming or Delaware annual reports, franchise taxes and other state obligations are separate and unaffected.
It does not replace Form 5472. The Pro Forma 1120 alone does not satisfy §6038A. Form 5472 is the substantive reporting; the pro forma is the cover sheet.
Where to file
Mail or fax the complete packet, Pro Forma 1120 with Form 5472 attached, to the dedicated address for foreign-owned US DEs:
Internal Revenue Service, 1973 Rulon White Blvd, M/S 6112, Attn: PIN Unit, Ogden, UT 84201
Fax: 855-887-7737.
Do not use the standard Form 1120 mailing address that applies to traditional US corporations. That routes to a different processing center and can delay or misprocess the return.
E-filing is not available for foreign-owned disregarded entities. Send by certified mail with return receipt, or fax at 300 DPI or higher.
Sending the two forms as one packet
If you are filing for the first time, you are sending two forms as one packet: the Pro Forma 1120 cover sheet and Form 5472. Complete only the name and address block, Item B, Item E where applicable, and the signature. Leave Items A, C and D blank, along with every income, deduction, tax and schedule section.
For automated preparation, filetax.co generates the complete packet for $99. Cases with multiple foreign related parties or non-monetary transactions benefit from CPA review.
For the Form 5472 walkthrough, see Form 5472 Field by Field. If you have missed prior years, start with Missed Form 5472. The IRS instructions are at IRS.gov/Form1120 and IRS.gov/Form5472.
Frequently Asked Questions
Does my LLC owe corporate tax because Form 1120 is involved?
No. The Pro Forma 1120 is a cover sheet, not a tax computation. The LLC remains a disregarded entity for income tax purposes and owes no US corporate tax as a result of filing it.
Can I file Form 5472 without the Pro Forma 1120?
No. The IRS instructions require Form 5472 to be attached to a Form 1120, filed in pro forma fashion for foreign-owned DEs. Form 5472 alone is incomplete and may be rejected or misprocessed.
Do I need to fill in total assets or date incorporated?
No. For foreign-owned US DEs the instructions list only the name and address, Item B and Item E. Some preparers add total assets voluntarily to match Form 5472 Line 1c, but it is not required.
Is Pro Forma 1120 the same as Form 1120-F?
No. Form 1120-F is the US Income Tax Return of a Foreign Corporation. A Pro Forma 1120 is a Form 1120 used as a transmittal for Form 5472 by foreign-owned US disregarded entities. Different forms, different purposes.
Do I write "Foreign-owned U.S. DE" on Form 5472 as well?
No. It goes on the Pro Forma 1120 page 1 heading. Form 5472 has its own structure identifying the reporting corporation.
What if I accidentally filled in income on the Pro Forma 1120?
Filling in income lines does not create a tax liability for a foreign-owned single-member LLC, but it can confuse IRS processing. If you have already filed that way, file an amended Pro Forma 1120 marked "Amended" with the income lines blanked out.
Do I file a Pro Forma 1120 every year?
Every year that Form 5472 is filed. The cover sheet accompanies each year's Form 5472. There is no one-time filing.
What if the LLC is in its final year?
Check the Final return box under Item E. Form 5472 is still required for the final year, covering transactions through the dissolution date. No further filings are required after dissolution.
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