Form 5472 Explained: What Foreign-Owned US LLC Owners Must File

Short answer: if you're a non-US person who owns a US LLC (even a single-member LLC with no US tax due), you generally must file Form 5472 attached to a pro-forma Form 1120 every year. Missing it carries a $25,000 penalty — so this is one deadline you don't want to learn about late.

Who this applies to

Form 5472 applies to a US LLC that is:

• Foreign-owned — at least 25% owned by a non-US person or entity, and
• A disregarded entity (the typical single-member LLC).

This catches a huge number of international founders who form a US LLC (often in Wyoming or Delaware) to bill US clients or use Stripe/Mercury — and don't realize they have a filing obligation even if the LLC owes no US income tax.

What you actually file

• Form 5472 — reports "reportable transactions" between you (the foreign owner) and the LLC: money you put in (contributions) and money you took out (distributions), plus formation/operating amounts.
• A pro-forma Form 1120 — a mostly-blank corporate return used only as a cover page to carry the 5472. You're not filing a real corporate tax return; the 1120 just transmits the 5472.

The deadline

It's generally due on the 15th day of the fourth month after your tax year ends — April 15 for calendar-year filers. A 6-month extension (Form 7004) is available, but the 5472 itself still must be filed.

The $25,000 reason to care

The penalty for failing to file (or filing late/incomplete) Form 5472 is $25,000 — and it can repeat. For a small LLC, that's catastrophic. The good news: it's entirely avoidable with a reminder and the right records.

How to stay compliant without stress

1. Get an EIN for the LLC (Form SS-4).
2. Track owner ↔ company transactions all year — every contribution and distribution is what the 5472 reports.
3. Watch the April 15 deadline (and file Form 7004 if you need more time).
4. Work with a preparer familiar with foreign-owned LLCs for the actual filing.

FounderFi is built for exactly this audience: it has guides for EIN, 5472, BOI, and W-8BEN, tags your owner contributions and distributions for the 5472, and reminds you before the deadline so the $25k penalty never sneaks up.

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Educational guidance, not licensed tax or legal advice. Foreign-owned entity rules are complex — confirm your obligations with a qualified CPA.