A domestic LLC owned even partly by a non-US person or foreign company takes on a filing obligation most owners never expect from a single-member LLC that otherwise has no separate federal income tax return of its own: Form 5472, attached to a pro forma Form 1120.
Who Actually Has to File
Any US single-member LLC that is 100% owned, directly or indirectly, by a foreign person or foreign entity must file Form 5472 every year — including years with zero income or activity. This obligation exists specifically because a disregarded single-member LLC otherwise wouldn’t have to file anything at the federal level, and the IRS wants visibility into transactions between the LLC and its foreign owner regardless.
What Counts as a “Reportable Transaction”
The reporting requirement isn’t limited to sales or services — capital contributions, distributions, loans, reimbursements, and even the LLC’s own formation costs paid by the foreign owner all count as reportable transactions. Something as small as paying a personal bill from the LLC’s bank account, or the LLC covering an owner’s travel expense, is a reportable transaction that has to be disclosed — leaving it off the form is treated the same as not filing at all.
The Penalty Structure Is Unusually Aggressive
Missing or filing an incomplete Form 5472 carries a flat $25,000 penalty, and if the IRS sends a notice that goes unaddressed, an additional $25,000 penalty applies every 30 days afterward with no stated cap. The IRS has automated much of this notice process, meaning there is very little practical delay between a first miss and the second penalty compounding on top of it — this isn’t a form where “we’ll catch it next year” is a survivable strategy.
Deadlines and the EIN Prerequisite
The pro forma Form 1120 with Form 5472 attached follows the standard April 15 deadline for calendar-year filers (2026), extendable to October 15 via Form 7004, and must be mailed or faxed to a specific IRS address in Ogden, Utah rather than filed through standard e-file channels most owners are used to. Before any of this can be filed, the LLC needs its own EIN — a foreign owner without a US Social Security Number can still obtain one, but the application process takes longer and often requires working directly with the IRS’s international EIN unit rather than the fast online application most domestic owners use.
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Related reading: LLC vs. S-Corp vs. C-Corp Tax Tradeoffs and How to Choose an LLC Formation Service.
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