Federal tax filing for foreign-owned US LLCs.
Filed correctly, on time, every year.
Federal tax filing is the yearly IRS obligation your foreign-owned single-member US LLC must meet: Form 5472 with a Pro-Forma 1120, even with zero income. Skipping it triggers automatic penalties that compound per year per LLC. Monezzi prepares and files both by April 15.
Focus on your customers, we will handle the bureaucracy.
Sources: official IRS guidance on Form 5472 — Information Return of a 25% Foreign-Owned US Corporation, Form 1120 — US Corporation Income Tax Return, and the IRS Instructions for Form 5472 covering related-party disclosures and the $25,000 penalty regime.
Why Filing Federal Taxes Is Important
Federal filing is not optional. The IRS treats foreign-owned LLCs as a high-information-priority class — the disclosure forms exist specifically to map ownership across borders, and the penalties are designed to be unavoidable once you miss a deadline.
Compliance and protection
Form 5472 is mandatory for foreign-owned single-member LLCs even with zero income. Filing on time blocks the $25,000 automatic penalty and keeps your LLC in good standing with the IRS.
Financial integrity
Filed returns become the audit trail banks, investors and future acquirers expect. Without them, due diligence stalls and Mercury or Stripe may freeze the account during periodic review.
Treaty and deduction access
Filing federal returns is the prerequisite for claiming US tax treaty benefits, foreign tax credits, and any business deductions your LLC accrues. No filing means no claim.
Operational continuity
Late or missing federal filings flag the LLC across federal systems. Bank applications, payment processor underwriting, and any future visa filing reference these records.
The three things that catch every founder filing Form 5472 alone.
The IRS expects every transaction between you (the foreign owner) and the LLC listed: capital you put in, loans you advanced, distributions you took out. Forgetting one is the most common reason a 5472 gets rejected or flagged for audit. We pull this from your books, not from memory.
A single-member LLC is a disregarded entity, so it has no normal 1120 return — yet the IRS still requires a 1120 cover with the 5472 attached. File the 5472 by itself and the IRS treats it as not filed. The $25,000 penalty applies.
Founders who run on a different fiscal year at home (UK April, Australia June, several Gulf states variable) routinely miss the April 15 US deadline. The IRS does not accept "I file in July at home" as a reason. The penalty is automatic.
"Form 5472 rejections almost always come from missing related-party disclosures — every loan from owner to LLC, every contribution, every distribution must be itemized. We do this from the books, not from memory. The $25,000 penalty is automatic and it scales per year per LLC, so a founder who has been quiet for three years is staring at $75,000 before interest. We routinely back-file three years of returns in a single engagement."
Federal Tax Filing Overview & Key Details
Federal tax filing for a US business is driven by entity type. The form, deadline and disclosure obligations differ for a foreign-owned single-member LLC, a multi-member LLC, a C-corporation, and a partnership. The four cards below cover the patterns that apply to most non-US founders.
Foreign-owned single-member LLC
Form 5472 attached to a Pro-Forma 1120. Required every year even with zero activity. Deadline April 15 for calendar-year LLCs. $25,000 minimum penalty for non-filing.
Multi-member LLC
Form 1065 partnership return with a Schedule K-1 issued to each member. Deadline March 15. Each foreign member also needs to handle their own US tax position separately.
C-corporation
Form 1120 corporate income tax return. Deadline April 15 for calendar-year corporations. Foreign ownership above 25% also triggers Form 5472 disclosures inside the 1120.
Penalty regime
Form 5472: $25,000 per LLC per year, plus $25,000 for every 30 days the failure continues after IRS notice. Multi-year stacks. The IRS does not need to prove harm — the penalty is automatic.
How we assist — step by step
We prepare your federal return from your books, not from a one-off questionnaire. The IRS controls the acceptance side; we control the accuracy and the deadline.
Entity and obligation review
We confirm your LLC structure (single-member foreign-owned, multi-member, C-corp), the applicable forms (5472 + Pro-Forma 1120, 1065 + K-1, 1120), prior-year filings, and any back-filing obligation.
Books and related-party reconciliation
We pull your bookkeeping records and reconcile every transaction between you (the foreign owner) and the LLC — capital contributions, loans advanced, distributions taken. Each one becomes a line on Form 5472.
Forms prepared and reviewed
We prepare Form 5472, the Pro-Forma 1120 wrapper, and any supporting schedules. A second tax preparer reviews related-party disclosures before submission — this is where DIY filings fail.
Submission to the IRS
We submit the return through the IRS-approved channel for your entity type — e-file plus paper attachment where Form 5472 requires it. The IRS controls processing from here; we cannot promise a confirmation date, but we track the submission.
Confirmation, vault, and next-year reminder
Once accepted, the filed return is stored in your Documents vault. We pre-schedule your next federal filing so you do not have to remember April 15 again — the system tracks it for the life of the LLC.
Frequently Asked Questions
Answers to common questions about federal tax filing for foreign-owned US LLCs.
Yes. Every foreign-owned single-member US LLC must file Form 5472 with a Pro-Forma 1120 every year, even with zero income, zero expenses, and zero activity. The filing reports related-party transactions between you (the foreign owner) and the LLC — capital contributions, loans, distributions. The obligation starts the year the LLC is formed.
The IRS assesses a $25,000 penalty per LLC per year for each Form 5472 not filed on time, plus an additional $25,000 every 30 days after IRS notice if the failure continues. The penalty is automatic — the IRS does not need to prove harm. Multi-year failures stack.
A Pro-Forma 1120 is a stripped-down version of the corporate income tax return used purely as a cover sheet for Form 5472. A single-member LLC is normally a disregarded entity for tax purposes, but the IRS requires Form 5472 to be attached to a 1120 — so you file the 1120 with only the header filled in, and the 5472 itself carries the substance.
A multi-member LLC defaults to partnership taxation and files Form 1065 with a Schedule K-1 for each member. A single-member LLC owned by a foreign person files Form 5472 with a Pro-Forma 1120. They are entirely different filings with different deadlines (March 15 for 1065, April 15 for 5472 + 1120). If you add a second member during the year, your filing obligation can change mid-year.
You can technically file Form 5472 with only the LLC EIN — your personal ITIN is not strictly required for this form. But the moment you need to sign any return personally (an extension Form 7004, a treaty claim, an amended return), the IRS expects an ITIN. We recommend applying for an ITIN in parallel so you are never blocked.
Yes. The IRS deadline is fixed by the LLC tax year, not your personal country. A US LLC defaults to a calendar tax year (Jan 1 to Dec 31) with returns due April 15. Your home country tax year is irrelevant — and missing the US deadline triggers the $25,000 penalty regardless of when you file in your own country.
No. Form 5472 and Pro-Forma 1120 are federal IRS filings. State filings — annual report, franchise tax, state income tax where applicable — are separate, vary by state (Delaware vs Wyoming vs Florida vs California), and have their own deadlines. Monezzi handles both federal and state on every formation plan, but they are distinct workstreams.