If your US single-member LLC has a foreign owner, keeps its default disregarded tax status, and has reportable transactions, Form 5472 belongs on your filing checklist. It can be required even when no US tax is due.

This guide covers that disregarded-entity case. It does not cover an LLC that has elected corporate tax treatment. Confirm the classification first, then use the current IRS instructions for the return you actually need to file.

What Form 5472 actually is

Form 5472 is an information return, not a tax bill. It reports transactions between a US company and its foreign owner; it does not, by itself, calculate or collect a cent of tax.

The IRS calls this a foreign-owned U.S. DE: a domestic disregarded entity wholly owned by a foreign person. A US single-member LLC has default disregarded status unless it elects corporate tax treatment. For the disregarded-entity case covered here, Form 5472 accompanies a pro-forma Form 1120 when required. If the LLC has made a corporate election, do not use this guide’s cover-sheet-only instructions as its corporate return.

“Pro-forma” is doing heavy lifting there, in your favor. You do not complete the 1120 as a corporation would. You fill in only the name and address, items B and E, and write “Foreign-owned U.S. DE” across the top. The 1120 is a cover sheet; Form 5472 is the actual content.

Who must file, and why “I owe no tax” does not excuse you

The trigger is not profit, revenue, or US activity. It is reportable transactions with your foreign owner during the year. Every year your LLC has them, the filing is due, even in a year with zero US tax owed.

Here is the part that catches new founders: money moving between you and the company is the kind of transaction the form exists to report. The capital you contribute to start the LLC, and formation costs you cover personally on the company’s behalf, are commonly reportable transactions in exactly this sense. Which means the practical rule is blunt: assume your first year is a filing year. You formed the company; something of yours almost certainly moved into it.

An SSN or ITIN does not settle the LLC’s tax classification. If a non-US company owns the LLC, or you have made a tax election, confirm the applicable return with a qualified tax adviser. Use the LLC checklist to organize the process, not to determine every tax obligation.

The penalty

Per the IRS Form 5472 instructions: a penalty of $25,000 is assessed on a reporting company that fails to file Form 5472 when due and in the manner prescribed. Two features deserve your full attention.

First, “incomplete” counts as “missing.” The instructions state it flatly:

“Filing a substantially incomplete Form 5472 constitutes a failure to file Form 5472.” IRS Form 5472 instructions

A rushed, half-answered form can earn the same penalty as no form at all. Take the extra evening.

Second, the penalty compounds. If the failure continues more than 90 days after the IRS notifies you, an additional $25,000 accrues for each 30-day period the failure persists, with no stated maximum. This is not a fine you dispute at leisure; it is a meter that runs.

The registry’s read: this penalty structure exists to make information reporting non-optional, and it succeeds. Treat the filing with the seriousness of the number, and the number never applies to you.

How to file it: fax or mail, never e-file

The mechanics are where good intentions go wrong, because the obvious modern path is closed. Per the IRS instructions, a foreign-owned U.S. DE cannot file Form 5472 electronically. No e-file, no tax-software upload. The return goes to the IRS by fax or by mail, and nothing else.

The current fax number and mailing address are printed in the IRS Form 5472 instructions at irs.gov. Pull them fresh from the current revision each year you file. Do not reuse a number from a saved copy, a blog post, or last year’s filing, and do not trust one printed here if we had printed one. IRS contact details change, and a fax to a dead number is not a filing. (If you got your EIN by fax, this routine is already familiar; if not, the same lesson is covered in getting an EIN without an SSN.)

The due date: Form 5472 is due by the due date of that pro-forma Form 1120, including extensions. The extension mechanism exists, but the working assumption should be the base deadline. Pull the current date from the 1120 instructions and treat the extension as a contingency, not a plan.

The records to keep

The form reports owner-company transactions, so the record-keeping rule writes itself: keep a running log of every movement of money or property between you and the LLC. Capital you put in. Distributions you take out. Company expenses paid from your personal card. Personal costs paid from the company account (better: never do this, but log it if it happens).

A dated spreadsheet with amounts, directions, and one-line descriptions is enough. Reconstructing a year of transfers from bank statements the week the filing is due is how “substantially incomplete” happens.

And the single most valuable habit this registry can recommend: calendar the due date the week you form the LLC. Not at year-end, not when a reminder email arrives from a service you may have stopped paying. The week the state approves your articles, the Form 5472 deadline goes in your calendar with a four-week head start. Formation takes an afternoon; this calendar entry is the afternoon’s most important minute.

What Form 5472 is not

Two filings get tangled with this one in founders’ minds. Untangle them now.

It is not the BOI report. Beneficial ownership reporting to FinCEN is a different regime entirely, and for you, a closed one. Under FinCEN’s final rule, effective August 14, 2026, US-formed companies are permanently exempt from BOI reporting; the requirement now applies only to companies formed under foreign law that register to do business in a US state. Foreign ownership of a US-formed LLC changes nothing: FinCEN expressly declined to carve foreign-owned domestic companies back in. If someone is selling you “BOI compliance” for your US LLC, they are selling you an exemption you already hold.

It is not the EIN. The EIN is your company’s federal tax ID: a one-time acquisition, obtainable with no SSN or ITIN, covered start to finish in the EIN guide. Form 5472 is an annual obligation that, among other things, requires that EIN to exist. One is a number you get; the other is a report you file.

The registry’s summary

For a foreign-owned US disregarded entity, Form 5472 accompanies a pro-forma Form 1120 for each year with reportable transactions. Use fax or mail, follow the current IRS instructions, and check the Form 1120 due date including extensions. Keep a transaction log. If the LLC elected corporate tax treatment, obtain the appropriate corporate-return instructions instead.

New to the whole process? Start with the full guide to US LLCs for non-US founders, let the LLC checklist organize your preparation, and price the entire venture, state fees through renewals, in Schedule A, the True Cost Worksheet.

This is an independent registry publication, not a law firm, not a tax practice, and not a government agency. The process facts above trace to the IRS Form 5472 instructions, named in plain text and checkable at irs.gov. Whether your LLC owes US tax, and how your transactions should be characterized, are questions about your facts and your country’s rules: adviser territory, not registry territory.