Pro Forma Form 1120 — Plain-English Guide

Pro forma means filing Form 1120 for procedural compliance, not to calculate tax. For a foreign-owned disregarded LLC, the 1120 is mostly blank because income flows to the owner, not the entity. It serves as the attachment envelope the IRS requires for Form 5472.

Do NOT fill in income, deductions, or tax calculations on a pro forma 1120. Doing so would incorrectly suggest your LLC is a real C-corporation owing US tax. The IRS specifically designed the pro forma format to keep your LLC's disregarded-entity status intact while still satisfying the §6038A reporting attachment requirement.

You fill in the foreign-owned U.S. DE’s name, address, item B (EIN), and applicable item E boxes on Form 1120 page 1. Item E contains Initial return, Final return, Name change and Address change—not an amended-return box. Write "Foreign-owned U.S. DE" across the top.

Items C and D and Schedule L are not required by that special pro forma instruction. Do not treat an omitted optional cover field as permission to leave Form 5472 line 1c blank. See Form 5472 line 1c and total assets.

For signing, identify the authorized signer. Signing the completed cover in ink, then scanning it for fax, is a conservative workflow; see signature methods and submission routes.

For this foreign-owned U.S. DE pro forma package, the special IRS required-fields instruction is limited to name, address, item B and item E. It does not require income, deduction or tax computations, or Schedules C, J, K, L, M-1 or M-2.

Leave unrelated corporate-return computations and schedules blank rather than inventing entries. Items C and D are also outside the special required list. Form 5472 has its own requirements, including line 1c; see the total-assets guide.

The "Foreign-Owned U.S. DE" stamp is the visible notation the IRS instructions require at the top of Form 1120 page 1. It tells the IRS Ogden PIN Unit how to route the return, link the Form 5472 attachment, and avoid regular 1120 processing.

"Foreign-Owned U.S. DE"

This tells the IRS Ogden PIN Unit how to route and process the return. Without this stamp:

• The IRS may try to process it as a regular 1120 — triggering deficiency notices for missing income data.
• The Form 5472 attachment may not be correctly linked to your LLC.
• The return may be misrouted within the IRS, delaying processing.
• Worst case: the filing is treated as incomplete, triggering the $25,000 §6038A penalty.

You can hand-write it, type it, or stamp it — any visible "Foreign-Owned U.S. DE" notation at the top margin works. Our wizard automatically adds this text when generating the PDF.

The IRS doesn't have a dedicated form for foreign-owned DE disclosure. Form 5472 was designed for 25%+ foreign-owned US corporations (where the corporation files a real Form 1120). When the IRS extended §6038A to foreign-owned single-member LLCs in 2017, they needed a way to receive Form 5472 attachments — but those LLCs aren't real corporations and don't owe corporate tax.

The pro forma 1120 solution: file the existing 1120 structure with only the procedural fields completed, marked "Foreign-Owned U.S. DE" to flag the special status. This avoided creating a brand-new form and integrated cleanly into the existing IRS Ogden processing channel.

The downside: it's confusing for foreign LLC owners who see "file Form 1120" and assume their LLC has become a corporation. It hasn't — your LLC stays a disregarded entity for all other tax purposes.

Once your pro forma 1120 is filled and stamped, the full package order is:

1. Cover letter (1 page) identifying the filing.
2. Pro forma Form 1120 (1-2 pages, with the "Foreign-Owned U.S. DE" stamp).
3. Form 5472 (2 pages).
4. Part V supporting statement (1+ pages).
5. Reasonable Cause Statement (only if filing late under DIIRSP).

For a conservative signing workflow, sign the completed 1120 cover in ink and scan that page for fax. Use the 1120 pro forma instructions as a final field-by-field check, then fax the entire package to the IRS Ogden PIN Unit at +1-855-887-7737. Save the fax transmission receipt as transmission evidence.

Our service generates the entire correctly-formatted package automatically. You sign one PDF on screen (the signature embeds into every required signature box), an accountant on our team reviews it, and we fax it to the IRS. IRS fax delivery is included in every plan — no separate fee.

• Filling in income/deductions/tax: turns it into a real corporate return, can trigger US tax liability and audits.
• Writing "0" in blank fields instead of leaving empty: technically incorrect; the IRS instructions specify these fields stay empty.
• Missing the "Foreign-Owned U.S. DE" stamp: causes routing/processing issues at Ogden.
• Wrong tax year: form is for the tax year that ENDED, not the year you're filing in. 2024 return = tax year 2024 = filed by April 15, 2025.
• Wrong EIN: must match your CP-575 exactly. A digit transposition can trigger rejection.
• Unresolved signature method or authority: Form 5472 has no signature block. Signing the completed 1120 cover in ink is conservative practice, not a basis for declaring every other method invalid.
• Filing only the 1120 without Form 5472 attached: the whole point is the 5472 attachment; missing it defeats the purpose.
• Filing only Form 5472 without the pro forma 1120: also invalid; the IRS won't process a 5472 without its envelope.

Pro forma 1120 is a procedural envelope for foreign-owned DEs, while regular Form 1120 is a real corporate income tax return. The pro forma version leaves most fields blank, owes no tax, carries the "Foreign-Owned U.S. DE" stamp, and supports Form 5472.

Regular Form 1120 (for real US C-corporations):

• Real corporate income tax return.
• All income, deductions, and tax fields filled.
• Tax owed at corporate rates (21% federal).
• No special stamp.
• Filed once a year by April 15 (calendar-year corps).

If your LLC was structured as a C-corp election (Form 8832 "check the box" election to be taxed as a corporation), you'd file a regular 1120, not pro forma. Most foreign-owned LLCs do NOT make this election and remain disregarded entities.

Form 1120-F: "U.S. Income Tax Return of a Foreign Corporation." Filed by foreign corporations (not US-formed entities) that have US-source income or a US trade or business. Your foreign-owned US LLC is a domestic (US) entity, not a foreign corporation — so 1120-F doesn't apply to your LLC.

Form 1120-S: filed by S-corporations. S-corps require all owners to be US persons, so foreign-owned LLCs can never elect S-corp status. 1120-S is never the right form for a foreign owner.

Form 1120 (regular): filed by US C-corporations. Pro forma 1120 (same form, used differently) is the right answer for foreign-owned single-member LLCs.

Summary: 1120 pro forma = right; 1120-F = wrong (you're not a foreign corp); 1120-S = wrong (foreign owners can't have S-corps); 1065 = wrong (single-member LLCs aren't partnerships).

Our wizard generates a correctly-formatted pro forma Form 1120 with:

• "Foreign-Owned U.S. DE" stamp at the top.
• Entity name, EIN, US address pre-filled from your wizard answers.
• Date of incorporation pre-filled.
• Total assets at year-end pre-filled from your year-end total.
• Signature line ready for your in-portal canvas signature.
• All income/deduction/tax fields correctly left blank.
• Any populated item C, item D or Schedule L fields are additional preparation practice, not requirements of the special pro forma instruction.

No manual form-filling. The signed PDF is ready to fax to +1-855-887-7737, and we handle that for you — IRS fax delivery is included in every plan.

Pricing: $149 Standard (ready in 5-7 business days) or $199 Express (within 3 business days) — same filing either way. +$99 per additional past year. 100% money-back guarantee if we fail to submit.