Form 1120 is a six-page corporate tax return with more than 35 numbered lines and if you own a foreign-owned single-member LLC, you have probably been told you must file it. Here is the relief: you only need a handful of fields on page one, and every income line stays empty.
Most foreign owners lose hours trying to figure out which of those lines apply to them. The answer is almost none because what you are filing is not a real tax return. It is a pro forma Form 1120: a cover sheet whose only job is to carry your Form 5472 into the IRS system.
This guide shows exactly which boxes to fill, what to write across the top, what to leave blank, and where the finished package goes. It follows the current IRS instructions field by field the same field map our software uses to generate these filings every day.
TL;DR:A pro forma Form 1120 is a cover page for Form 5472. Per the IRS instructions, you complete only the LLC’s name and address, items B and E, and write “Foreign-owned U.S. DE” across the top. All income, deduction, and tax lines stay blank. Fax it with Form 5472 to (855) 887-7737 or mail it to the IRS in Ogden, UT.
What Is a Pro Forma Form 1120?
A pro forma Form 1120 is a mostly blank corporate return that a foreign-owned US disregarded entity attaches to the front of its Form 5472. It reports no income and calculates no tax it exists only so the IRS can log the Form 5472 behind it under the LLC’s EIN.
That is the whole concept, and it is worth letting it sink in before you touch the form. “Pro forma” means as a matter of form. The IRS needs a processable return type to attach your information report to, and Form 1120 is the vehicle it chose. Your LLC does not become a corporation, does not owe corporate tax, and does not take on any of Form 1120’s normal bookkeeping burden. If you want the deeper comparison of the two forms and why both appear in one package, see our guide to Form 5472 vs Form 1120.
Why a Disregarded Entity Files a Corporate Form at All
A single-member LLC that never elected corporate treatment is a disregarded entityfor income tax, the IRS looks straight through it to the owner. Under the entity classification rules in Treasury Regulations §301.7701, a disregarded entity normally files no federal return of its own.
That changed for foreign-owned LLCs with TD 9796, final regulations effective for tax years beginning in 2017. The IRS realized that a US LLC with a foreign owner and no US return created a reporting blind spot: money could move through a US entity with no paper trail. The fix was to treat a foreign-owned disregarded entity as a corporation solely for Form 5472 reporting purposes.
The result is the odd-looking package you are preparing today: the LLC is still disregarded for tax, but it must file Form 5472 each year it has reportable transactions with its foreign owner and because Form 5472 can only ride on a corporate return, a pro forma Form 1120 comes along as the cover sheet. Skipping the package triggers the $25,000 penalty under IRC §6038A.
Exactly Which Fields to Complete
The IRS instructions for Form 5472 are unusually direct here: a foreign-owned US DE completes only the name and address of the entity and items B and E on the first page of Form 1120, and writes “Foreign-owned U.S. DE” across the top. Everything below is the full field-by-field map:
| Field on Form 1120, page 1 | What to enter |
|---|---|
| Across the top margin | Write or type “Foreign-owned U.S. DE” this label is what tells the IRS how to process the package |
| Tax year line | The calendar year (or fiscal year dates) the filing covers e.g. beginning 01-01-25, ending 12-31-25 |
| Name | The LLC’s exact legal name as registered with the state and shown on its EIN letter |
| Address | The LLC’s mailing address a US registered agent address or your foreign address both work, as long as the IRS can reach you there |
| Item B EIN | The LLC’s Employer Identification Number. No EIN means no filing get one first via our EIN guide |
| Item C Date incorporated | The LLC’s formation date. The instructions do not strictly demand it, but it is harmless, commonly included, and helps the IRS match a first-year filing |
| Item E checkboxes | Check (1) Initial returnfor the LLC’s first filing year, (2) Final return if it dissolved, or the name/address change boxes if those apply. Most years, nothing is checked |
| Everything else | Blank see the next section |
A note on signing: the instructions do not squarely say whether a pro forma return must be signed, and practice varies. Signing the officer block (you, as owner or member) costs nothing and removes any doubt, so we include the signature block name, title, and date on every package we generate. If you prepare the form yourself, signing is the safer path.
What to Leave Blank and Why
Every income, deduction, and tax line on Form 1120 lines 1 through 37, Schedule C, Schedule J, Schedules K, L, M-1, and M-2, all of pages 2 through 6 stays completely blank. Not zero-filled. Blank.
The reason goes back to what the form is. Your LLC is disregarded, so it has no corporate income to report; its results (if taxable in the US at all) belong on the owner’s own return, not here. Entering figures on the income lines turns a cover sheet into something that looks like a real corporate return, which can confuse processing or generate correspondence you do not want. Total assets (item D) likewise stays empty the balance sheet schedules it feeds are not part of a pro forma filing.
The pages themselves are optional baggage: since only page 1 carries information, many preparers (including our generator) submit page 1 alone rather than five blank pages behind it. The actual numbers capital contributions, distributions, expenses you paid for the LLC all go on Form 5472, Part IV, which our part-by-part Form 5472 guide covers line by line.
Rather not hand-fill a corporate form at all? Form5472.io generates your complete, IRS-ready pro forma 1120 + Form 5472 package correct label across the top, right boxes checked, everything else properly blank for $147, one time.
Generate my filing →Common Errors on the Pro Forma 1120
The form takes five minutes, but these mistakes show up constantly in the filings people bring us to fix:
- Missing the “Foreign-owned U.S. DE” label. This is the single most important mark on the page without it, your package can be treated as a defective corporate return instead of a Form 5472 transmittal.
- Filling in income lines with zeros. Well-meaning owners write “0” on thirty lines. The instructions ask for name, address, and items B and E adding more invites processing confusion.
- No EIN. An ITIN, SSN, or foreign tax number cannot substitute in item B. The LLC needs its own EIN before it can file at all.
- Wrong assembly order. The 1120 is the cover: pro forma 1120 on top, Form 5472 behind it, any reasonable-cause statement after that. Do not staple the 5472 on top or send the two forms separately.
- Sending it to the regular 1120 address or trying to e-file. This package has its own dedicated fax line and mailing address (below), and consumer e-file is not an option for a foreign-owned DE’s pro forma filing.
- Checking “Initial return” every year. Item E(1) applies only to the first year. Check it again in year two and the IRS now has two “first” returns for one EIN.
How It Attaches to Form 5472 and Where to Send It
Assembly is simple: pro forma Form 1120 on top, Form 5472 directly behind it, one package per tax year. Then send it one of two ways, per the current IRS instructions:
| Fax (recommended) | ||
|---|---|---|
| Where | (855) 887-7737 | Internal Revenue Service, 1973 Rulon White Blvd., M/S 6112, Attn: PIN Unit, Ogden, UT 84201 |
| Speed | Instant transmission, same-day proof | Days to weeks in transit from abroad |
| Proof of filing | Fax confirmation page keep it for years | Tracked-mail receipt use a tracked service |
| Quality note | IRS asks for 300 DPI or better | Print single-sided, no staples through the forms |
Faxing from outside the US is easiest with an online fax service our fax filing guide walks through it. Addresses and numbers can change, so confirm against the current Form 5472 instructions on irs.gov before sending.
The deadline is the LLC’s return due date: April 15 for a calendar-year single-member LLC, extendable to October 15 with Form 7004. For the full sequence from EIN to fax confirmation, follow our step-by-step filing guide.
The Bottom Line
A pro forma Form 1120 is a five-minute cover sheet, not a tax return. Complete the LLC’s name and address, item B (EIN), and item E if a checkbox applies; write “Foreign-owned U.S. DE” across the top; leave every other line blank; and attach Form 5472 behind it. Fax the package to (855) 887-7737 or mail it to the Ogden, UT address by April 15 (October 15 extended). Getting the cover sheet right matters because the form behind it carries a $25,000 penalty. Form5472.io prepares the entire package IRS-ready PDFs, $147 one-time, no subscription.
Frequently Asked Questions
Does a pro forma 1120 mean my LLC owes corporate tax?
No. The pro forma 1120 reports no income and computes no tax it is a transmittal cover for Form 5472. Your LLC remains a disregarded entity, and any US tax question is decided at the owner level, separately from this filing.
Do I write anything on the income lines, even zeros?
No leave them blank. The IRS instructions ask a foreign-owned US DE to complete only the name, address, and items B and E on page 1. Zero-filling the income and deduction lines adds nothing and can make the package look like a defective corporate return.
Does the pro forma 1120 need to be signed?
The instructions do not clearly say, so sign it. A signature from the owner in the officer block costs nothing and removes any doubt during processing. Many professional preparers and our generated packages include the signed block with name, title, and date.
Can I e-file the pro forma 1120 and Form 5472?
Not through consumer software. A foreign-owned disregarded entity’s package goes to a dedicated intake: fax to (855) 887-7737 or mail to the IRS Ogden, UT address in the Form 5472 instructions. Keep the fax confirmation or tracking number as your proof of on-time filing.
Do I file a new pro forma 1120 every year?
Yes one per year with reportable transactions. Each tax year gets its own pro forma 1120 + Form 5472 package, due April 15 (October 15 with a Form 7004 extension). Even a dormant LLC usually has reportable transactions paying state fees from your own pocket counts so most foreign-owned LLCs file every year.
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