Form 5472 for Foreign-Owned US LLCs: 2026 Complete Filing Guide

What is Form 5472?

Form 5472 is an IRS information return titled "Information Return of a 25% Foreign-Owned U.S. Corporation or a Foreign Corporation Engaged in a U.S. Trade or Business." It reports "reportable transactions" between a US entity and its foreign-related parties.

The trap for foreign-owned single-member LLCs: since January 2017, the IRS treats a foreign-owned single-member LLC as a "domestic corporation" solely for Form 5472 purposes (Treas. Reg. §1.6038A-1(c)(1)). This means:

• The LLC must file Form 5472 even if it made zero dollars.
• The LLC must file a pro-forma Form 1120 (US Corporate Tax Return) as a cover sheet, with only the identifying information filled in.
• The LLC must have an EIN (Employer Identification Number) to file.

This is not a tax return in the traditional sense — no tax is owed on the Form 1120 filing itself. It is a compliance disclosure. But the penalty for missing it is punitive.

Who Needs to File Form 5472?

You file Form 5472 if all three of these apply:

1. You have a US LLC (or corporation).
2. 25%+ of the LLC is owned by a non-US person (individual, corporation, partnership, or trust).
3. There were "reportable transactions" during the year — which the IRS defines very broadly: any capital contribution, distribution, loan, service, or payment between the LLC and the foreign owner counts. Even funding the LLC's initial bank account is a reportable transaction.

Practical consequence: if you are a non-US person who formed a US LLC and funded it with $100 to open a Mercury account, you have a reportable transaction and Form 5472 is due.

2026 Deadlines

• Calendar-year LLCs: April 15, 2026 (for tax year 2025). Automatic 6-month extension available via Form 7004 → new deadline October 15, 2026.
• Fiscal-year LLCs: 15th day of the 4th month after fiscal year end.
• Extension: Form 7004 must be filed by the original due date. Extension is granted for filing, not for paying tax — but since Form 5472 typically owes no tax, the extension is straightforward.

The extension applies to both the Form 1120 pro-forma and the attached Form 5472. Do not file them separately.

Penalty for Not Filing — $25,000 Per Form Per Year

Since December 2017 (Tax Cuts and Jobs Act), the penalty for failing to file Form 5472 timely, or filing an incomplete/inaccurate form, is $25,000. If the failure continues for more than 90 days after IRS notice, an additional $25,000 applies for each 30-day period thereafter.

The penalty is per form, per year. If you have 3 years of missed filings, the assessment can hit $75,000+ before you factor in the continuing failure escalation. The penalty is not a percentage of tax owed — it applies even when zero tax is due.

Reasonable-cause exception: the IRS may waive the penalty if the failure was "due to reasonable cause and not willful neglect." Standard reasonable-cause arguments (I did not know, my accountant did not tell me, I had no US income) are generally rejected. Successful arguments have involved: natural disaster affecting the filer, death or incapacity, or reliance on erroneous IRS written guidance.

How to File Form 5472 with Zero US Operations

The mechanical steps for a non-resident with a single-member US LLC:

1. Get an EIN — required. Non-residents file Form SS-4 by fax to the IRS International Line (+1-855-215-1627). Turnaround: 4-6 weeks in 2026. Attorneys and services charge $250-500 to handle this; you can do it yourself for free.
2. Prepare the pro-forma Form 1120 — fill in only page 1 identifying info (name, EIN, address, tax year, "Foreign-owned U.S. DE" checked in Item G). Leave all income/deduction lines blank or zero. Do not calculate tax.
3. Complete Form 5472 — one form per foreign related party. If you are the sole owner, that is one form. Fill in Parts I (identifying), II (related party info), and IV (monetary transactions).
4. Report every reportable transaction — capital contributions to the LLC bank account, distributions to yourself, loans in either direction, service fees. If the only transaction was a $100 opening deposit, that is what you report on Line 8 or 12 of Part IV.
5. Attach Form 5472 to Form 1120 — do not file separately.
6. Fax or mail to Ogden, UT — Form 1120 with 5472 attached goes to the Ogden, UT service center. E-filing is not supported for Form 5472 as of 2026.

DIY is feasible for a simple structure (one LLC, one foreign owner, straightforward transactions). If you have multiple related parties, cross-border loans, or transfer pricing questions, budget $500-1,500 for a US CPA who specializes in inbound foreign LLC filings.

Who Does Not Need to File

• Multi-member LLCs where each non-US owner holds less than 25%.
• Wholly US-owned LLCs.
• Multi-member LLCs that have elected corporate tax treatment and file Form 1120 with full financials (Form 5472 is still attached but the mechanics are different — talk to a CPA).
• LLCs with zero reportable transactions in the year (rare — even holding cash typically involves a bank fee that counts).