Form 5472 — officially titled "Information Return of a 25% Foreign-Owned US Corporation or a Foreign Corporation Engaged in a US Trade or Business" — is one of the most important and most overlooked US tax compliance obligations for non-resident LLC owners. It is the annual filing through which foreign owners of US LLCs report their relationship with, and transactions involving, the US entity to the IRS.
Unlike most tax forms, Form 5472 is an informational return — it does not calculate or collect tax. But it is mandatory, it carries significant penalties for non-filing, and it is frequently missed by UK and European founders who assume that if no US tax is owed, no US filing is required. That assumption is incorrect, and it is expensive when it proves wrong at audit time. For context on when US income tax itself applies to your LLC, see our guide on Effectively Connected Income.
Who Has to File Form 5472?
Form 5472 applies to any US corporation (or LLC treated as a corporation for US tax purposes) that is 25% or more foreign-owned and that had any reportable transactions with its foreign owner or related foreign parties during the tax year.
In 2017, the IRS extended this requirement to single-member LLCs owned by non-resident aliens — a change that significantly expanded the universe of foreign founders who must file. Under current rules, a single-member LLC owned by a non-resident alien and treated as a disregarded entity must file Form 5472 attached to a pro-forma Form 1120 for any tax year in which it had any reportable transactions. This applies regardless of whether the LLC earned any income, regardless of whether any US tax is owed, and regardless of whether the LLC was actively trading throughout the year.
What Counts as a Reportable Transaction?
A "reportable transaction" is broadly defined and includes virtually any movement of money or assets between you as the foreign owner and your US LLC. Common examples include:
- Capital contributions — money transferred from you to the LLC to fund its operations
- Distributions — money transferred from the LLC back to you as the owner
- Loans — amounts borrowed from or lent to the LLC by the foreign owner
- Payments for services — amounts paid between you and the LLC for services rendered
- Property transfers — transfers of assets between the owner and the entity
In practice, almost every active foreign-owned single-member LLC has at least one reportable transaction in every year it operates. If you have ever transferred money to your LLC to pay a bill, or taken money out of the LLC for personal use, those are reportable transactions. The threshold for triggering the filing requirement is low, and it is safe to assume that if your LLC was active in any way during the year, a Form 5472 filing is required.
The $25,000 Penalty
The IRS takes Form 5472 compliance seriously, and the penalties for non-filing reflect this. Failure to file a required Form 5472 — or filing an incomplete or inaccurate form — results in an automatic penalty of $25,000 per form, per tax year. This penalty applies regardless of whether any tax is owed, regardless of whether your LLC generated any income, and regardless of whether the non-filing was intentional or accidental.
A continued failure to file after the IRS notifies you of the delinquency triggers an additional $25,000 penalty for every thirty days the failure continues. For a founder who has unknowingly missed multiple years of Form 5472 filings — which is not uncommon among non-residents who were not advised of this requirement at formation — the accumulated penalties can reach six figures before any contact from the IRS.
The IRS does have a reasonable cause exception that can allow penalties to be abated in some circumstances, but demonstrating reasonable cause is a fact-specific determination that requires professional representation. It is far better to file correctly from the outset than to rely on penalty abatement after the fact.
What Form 5472 Requires
Form 5472 collects information about the reporting corporation (your LLC), its 25% foreign shareholders (you, as the owner), and the reportable transactions that occurred between them during the tax year.
Part I identifies the reporting corporation — its name, EIN, address, and tax year.
Part II identifies the 25% foreign shareholder — this is you as the non-resident owner, including your name, address, country of citizenship, and percentage of ownership.
Part III asks for the principal business activity of the LLC and some basic financial information about the entity.
Parts IV through VIII cover specific types of reportable transactions: sales and purchases of inventory and tangible property, sales and purchases of intangible property, consideration paid or received for services, amounts borrowed and loaned, and other transactions including contributions and distributions. For a typical single-member LLC used by a UK or European founder for digital services, the most commonly reported transactions are capital contributions (money transferred from you to the LLC) and distributions (money transferred from the LLC back to you).
The Pro-Forma Form 1120
Form 5472 for a disregarded LLC is not filed as a standalone document — it must be attached to a pro-forma Form 1120 (the US corporation income tax return). "Pro-forma" here means the Form 1120 is filed for informational purposes only: it is not a substantive tax return and does not result in corporate income tax being assessed. It simply provides the structural framework that the IRS requires for receiving the Form 5472 attachment.
The pro-forma Form 1120 must show the LLC's name, address, and EIN, and indicate that it is a disregarded entity filing solely to attach Form 5472. This combined filing — Form 1120 with Form 5472 attached — is submitted to the IRS by the applicable due date. Submitting Form 5472 without the pro-forma Form 1120, or vice versa, does not constitute a valid filing.
When Is Form 5472 Due?
For a disregarded LLC using a calendar tax year (1 January to 31 December, which is standard for most non-resident-owned LLCs), the Form 5472 attached to the pro-forma Form 1120 is due on 15 April of the following year. An automatic six-month extension of time to file can be obtained by submitting IRS Form 7004 before the original due date, pushing the deadline to 15 October.
An extension of time to file is not an extension of time to pay any tax that might be owed. For purely informational filers with no US tax liability, this distinction is academic — but it is worth understanding if your situation also involves actual US income tax obligations.
What Happens If You've Missed Previous Years
If you have owned a US LLC for one or more years and have not been filing Form 5472, you may be eligible for the IRS Delinquent International Information Returns Submission Procedures, which allow late filers to come into compliance with reduced or waived penalties where the non-compliance was not due to wilful neglect.
This process requires careful handling. Attempting to self-file multiple years of delinquent Form 5472s without professional guidance increases the risk of inconsistencies, incomplete disclosures, and responses from the IRS that are harder to manage than a clean first-time filing. A qualified US tax professional with experience in international information returns should be involved before any delinquent submissions are made.
Working with a Professional on Form 5472
Form 5472 is not a form that most UK or European accountants are familiar with — it is a US-specific international information return that sits squarely within the expertise of US Enrolled Agents and CPAs who specialise in cross-border structures. Filing it incorrectly — wrong transaction amounts, wrong ownership percentages, missing attachments — is treated the same as not filing at all for penalty purposes.
Richard Williams, our licensed Enrolled Agent, prepares and files Form 5472 and the associated pro-forma Form 1120 for UK and European founders with foreign-owned US LLCs. Annual compliance filing is available as a standalone service or as part of a broader US tax support package.
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