IRS Forms 1120 and 5472: what they are and when they apply to your LLC

Form 1120 and Form 5472 are not paperwork to improvise. They define how a foreign-owned LLC reports the owner, transactions and annual IRS position.

Two <a href="https://www.irs.gov" target="_blank" rel="noopener">IRS</a> forms generate more confusion than any others among LLC owners: Form 1120 and Form 5472. Most people with an LLC hear them named together, don't fully grasp what each one is, and, most importantly, don't know when they actually apply to their case.

This article isn't yet another step-by-step guide. If you want the filing procedure, you already have our <a href="/en/blog/form-5472-for-foreign-owned-llc">operational Form 5472 guide</a>. Here we explain what the two forms really are, how they relate, when they apply by profile, and which mistakes cost real money.

What Form 1120 actually is

The Form 1120, U.S. Corporation Income Tax Return is the federal corporate income tax return for US corporations. In its "normal" use, a C-Corporation files it to settle its tax on profits (21% federal today, plus state taxes).

Here comes the first nuance almost nobody explains: Form 1120 is also used empty, as a wrapper, so that certain LLC can meet information obligations. That's the pro-forma 1120 and we'll get to it below.

Quick map:

• Operating C-Corporation → Form 1120 with real numbers (income, expenses, tax due).
• Single-Member LLC of a non-resident → pro-forma Form 1120 (most fields blank) with Form 5472 attached.
• Single-Member LLC of a US resident → generally no 1120; income is reported on the personal return (Schedule C of the 1040).
• Multi-Member LLC → also doesn't use 1120 by default; files Form 1065 (partnership), unless it elects corporate taxation.

What Form 5472 actually is

The Form 5472, Information Return of a 25% Foreign-Owned U.S. Corporation or a Foreign Corporation Engaged in a U.S. Trade or Business is an information return, not a tax return. It pays no tax. Its mission is to inform the IRS of transactions between the US entity and foreign related parties.

For most of our clients at Exentax, that "US entity" is a Single-Member LLC owned by a non-resident, and the "foreign related party" is the owner himself. The "transactions" are any movement of money between you and the LLC: initial contributions, transfers from the LLC to your personal account, one-off payments, loans.

Why does it matter? Because since 2017 disregarded entities owned by foreigners are treated as corporations for 5472 purposes. This means that even though your LLC does not pay federal income tax, it is required to report who owns it and how money has moved between you both. If you do not file it, the base penalty is USD 25,000 per form per year. If the failure continues for more than 90 days after an IRS notice, a further USD 25,000 applies for each 30-day period or fraction thereof, with no maximum stated in the current instructions. Exentax maps the weak point to a concrete next step inside the client file.

The "pro-forma 1120" trap

This is where people get lost. Your non-resident Single-Member LLC:

1. Doesn't pay US corporate income tax on income without effective connection to the US.
2. But does have to file a Form 1120 every year, blank, so that 1120 acts as the envelope for Form 5472.

This is called pro-forma Form 1120. Only the identification fields at the top are filled in ("Foreign-owned U.S. DE"), "Form 1120, Foreign-owned U.S. DE" is hand-written across the top, and the Form 5472 is attached. The rest of the 1120 is blank (no Schedule M, no balance sheet, no tax computation).

If you got your LLC from a provider who told you "you don't need to file anything because you don't pay tax", that provider is confusing "not paying" with "not reporting". They are different things.

When do they actually apply? Profile table

Almost every client who reaches Exentax with a US LLC falls into row 2: annual pro-forma 1120 + 5472.

"Reportable transactions": what counts and what doesn't

Form 5472 asks you to report the reportable transactions between the LLC and the foreign related party. The practical definition for your case:

• Initial or subsequent capital contributions → reported.
• Distributions or "draws" from the LLC to your personal account → reported.
• Payments by the LLC to related companies or persons abroad → reported.
• Loans between you and the LLC → reported.
• Payments for services rendered by you (if you invoice as an individual from another country to the LLC) → reported.

What is not reported are payments to unrelated providers (an external freelancer, a SaaS, a bank). The criterion is relationship, not nationality.

In most starts, a single initial contribution (the transfer you made to fund the LLC) already triggers the obligation. From there, you are inside the regime.

Deadlines, extensions and where to send it

• Standard deadline: April 15 of each year, for the prior fiscal year ending December 31.
• Extension: six months with Form 7004, moving the deadline to October 15.
• Filing method: an LLC owned by a non-resident without a mandatory e-file requirement usually sends it by certified mail to the IRS Service Center in Ogden, Utah or by fax to the specific number published by the IRS for foreign-owned DEs. Always confirm the current address/fax for the year in question.
• EIN required: without an EIN you cannot file. If you don't have one yet, you must obtain it first (Form SS-4).

Delays are not cheap. The USD 25,000 penalty for an unfiled 5472 also applies for incomplete or inaccurate information, not only for not filing anything at all. Exentax records the decision so the next conversation starts from evidence, not memory.

Typical mistakes when preparing 1120 + 5472

1. Filling out the pro-forma 1120 as if it were a real 1120. You put in figures, balances, expenses. The IRS processes it as a C-Corp return and chaos follows.
2. Forgetting that the 5472 goes attached to the 1120, not on its own. If you send it separately, it is not considered filed.
3. No clear Operating Agreement and reporting transactions with no supporting documentation. When the IRS asks for clarifications, there is nothing to show.
4. Mixing the personal account with the LLC's and then trying to reconstruct "reportable transactions" at year-end. It comes out expensive and wrong.
5. Trusting "I haven't received anything from the IRS, all good". The IRS doesn't warn before sanctioning. Penalties are imposed and discovered when action is taken against the EIN or a future filing is rejected. Exentax reviews the case before money, signatures or provider replies move forward.
6. Filing the 5472 without the foreign owner's TIN/EIN. Even as a non-resident, the form requires identification. Without it, it is incomplete.

Who is NOT obligated (the few cases)

Cases where you do not need to file 1120 + 5472:

• Your LLC has multiple members, is classified as a partnership, and has no foreign related parties with reportable transactions (uncommon scenario if you are foreign).
• You are a US tax resident and your Single-Member LLC reports directly on Schedule C of your personal 1040. There is no "foreign-owned DE" here.
• Your LLC has elected to be taxed as a C-Corp and already files a real 1120, with no transactions with foreign related parties (rare if your international business goes through the LLC).

Outside those cases, assuming you are exempt is a bet that doesn't pay off: the cost of preparing these forms properly is far lower than the minimum penalty. Exentax documents that point before it becomes an operational emergency.

How this fits into your day-to-day

If you run the LLC's operations correctly during the year (separate account, record of contributions and draws, signed Operating Agreement, minimal bookkeeping), preparing the pro-forma 1120 + 5472 at year-end is a calm task. If you arrive at December 31 with the LLC's account mixed with your personal one, with no documentation and not knowing which movements are reportable, the cost and risk shoot up.

That's why at Exentax we treat these forms as the natural by-product of good annual management, not as a March drama. The difference between the two is following the <a href="/en/blog/annual-llc-maintenance-irs-state-and-banking-control">annual obligations calendar</a> and keeping effective separation between your personal assets and the LLC's.

Form 1120 and Form 5472 are one filing package

• Form 1120 = corporate income tax return. In your non-resident LLC it is used empty, as the envelope for Form 5472.
• Form 5472 = information return on transactions between the LLC and you (or any foreign related party).
• They almost always apply if you are a non-resident with a Single-Member LLC and have moved money between you and the LLC.
• No tax is paid with these forms, but not filing them costs USD 25,000 per year.
• The most expensive mistake is filling them out poorly or arriving at year-end without the documentation backing what is reported.

> <a href="/en/book">Review my structure</a>

If you have doubts about whether your case is properly set up, about prior years, or about how to regularise late filings, we'll review it with you in a strategic 30-minute review. Better to understand it well once than to pay avoidable penalties every year. At Exentax we map the exposure early, prepare the reasonable-cause file and reduce avoidable escalation before the authority controls the timeline.

The next step is not just knowing that Forms 1120 and 5472 exist. It is building the annual file early enough: ownership, related-party transactions, accounting records, EIN, deadlines and the evidence needed to file before the year-end rush.

What Form 1120 really is

For reportable transactions, the real work is classification: contribution, distribution, loan, service payment or reimbursement. Exentax prepares the transaction note so the 5472 is not built from memory.

### Forms 1120 + 5472 from a UK perspective

UK-resident sole members of US LLC face a parallel reporting stack: HMRC requires disclosure of overseas income on the SA106 (Foreign Pages) of the Self Assessment return, and the Companies House confirmation statement (CS01) is the UK functional equivalent of the US 1120 informational filing. Where the LLC is treated as opaque under HMRC's check-the-box guidance (INTM180030), CFC charges under Part 9A TIOPA 2010 may apply alongside the US §6038A reporting.

What 1120 + Form 5472 actually report (and what they do not)

For a single-member LLC owned by a non-US person and disregarded for

US tax purposes, the IRS requires a pro-forma 1120 envelope used

solely as the carrier for Form 5472. This pair does not assess US

tax on a foreign-owned disregarded LLC; it documents that certain

reportable transactions between the LLC and its foreign owner (or

related parties) actually took place. The IRS wants visibility, not

necessarily revenue, on these flows.

If the year had zero reportable transactions, the pair is still

generally filed with values at zero so the IRS sees activity status

explicitly. Skipping the filing is what triggers the well-known

penalty exposure under the regulations. In an Exentax file, the source record comes first and the response follows from it.

Three real filing patterns we run

A single-member LLC with one capital contribution at formation, a

small monthly draw to the foreign owner, and no other related-party

flows. The 5472 reports the contribution and the draws; the

pro-forma 1120 carries the envelope. Filing season takes a couple of

hours of structured work, including the bookkeeping reconciliation.

A single-member LLC that lent money to a related foreign company,

later repaid, with normal-rate interest. The 5472 reports the loan

issuance and the repayment; the interest accrual is part of the LLC

books and is mirrored in the home-country declaration of the owner.

Documentation is the friend here: the loan agreement and the

amortisation schedule sit in the LLC's compliance folder.

A multi-year LLC with no activity in the current year. We still file

the pro-forma 1120 + 5472 with zeros, attach a short internal

memo explaining the dormant year, and keep the file ready for the

moment the LLC reactivates.

Mistakes that lead to penalty letters

• Treating the pair as a tax return that "owes nothing" and skipping

it. It is a reporting filing; the absence of tax does not remove

the duty.

• Mixing personal owner expenses into the LLC books, then trying to

reconcile at filing time. Keep the boundary clean monthly.

• Forgetting that a draw to the foreign owner is a reportable

transaction. It often is, depending on its character (return of

capital, distribution, etc.).

• Filing late. The penalty for a missed Form 5472 is substantial.

applies even when no US tax is due. At Exentax, concern becomes controlled work: context, document, action and review.

Pre-filing checklist

• LLC EIN matches the IRS letter (CP575).
• Operating year confirmed (calendar year by default for a

single-member disregarded LLC).

• Bookkeeping closed and reconciled with banks.
• Related-party flows mapped to 5472 line categories.
• Owner identification document on file matches the BOI submission.
• Filing channel ready (paper or e-file with authorised provider).

We treat 1120 + 5472 as the LLC's annual handshake with the IRS:

quiet, predictable and structured. A clean filing this year makes

the next year quieter still.