What happens if you don’t file Form 5472: IRS penalties and how to fix it

5472 costs 25,000 USD per form per year, plus 25,000 USD every 30 days after IRS notice, plus the cascade with the 1120. How the IRS finds out, the three late-filer profiles, reasonable cause, delinquent submission and a realistic plan to close at zero.

There is one filing in the tax life of a single-member foreign-owned LLC that cleanly separates the people who manage it well from the ones walking into a five-figure problem: Form 5472. It is not a tax. It is an informational return. Precisely because it is "only informational", a lot of people ignore it, file it late, file it with broken data, or never even realise it exists. The <a href="https://www.irs.gov" target="_blank" rel="noopener">IRS</a> rarely forgives that gap: the base penalty is USD 25,000 per missed form, per year, and it stacks. The Exentax file stays aligned: facts first, documents second, response after that.

This article is not the step-by-step filing guide (for that you already have our <a href="/en/blog/form-5472-for-foreign-owned-llc">complete Form 5472 guide</a> and the piece on <a href="/en/blog/irs-form-1120-and-5472-what-they-are-when-they-apply">when 1120 and 5472 actually apply</a>). This is what happens once you haven't filed it, and how to climb out of that hole without destroying the LLC or your personal tax position.

What exactly the IRS sanctions

The rule lives in section 6038A(d) of the Internal Revenue Code, reinforced in 2017 by the Tax Cuts and Jobs Act. The base in force today is USD 25,000 per form not filed, filed late, or filed substantially incomplete. Until 2018 the penalty was USD 10,000; since then it has been fixed at USD 25,000 and, absent legislative change, that is the number you will hit. The Exentax approach is practical: confirm the data, prepare the evidence and close the next step.

On top of that base sit three things most people don't see coming:

Persistence penalty. If the IRS formally notifies you of the failure and you do not regularise within 90 days, another USD 25,000 is added for each 30-day period (or fraction) you remain non-compliant. No published cap: real cases reach six figures.
One penalty per year, not one period. Three years missed = three forms. Three × USD 25,000 = USD 75,000 before interest.
Cascade with Form 1120. Your single-member foreign-owned LLC must file pro forma Form 1120 + Form 5472 together. If you missed the 5472, you almost certainly missed the 1120, which adds extra exposure for late-filing of the 1120 under §6651, although the §6651 monetary penalty is calculated on tax owed, so on a pro-forma LLC with no tax due the amount is usually zero or residual; the main risk remains the 5472.

Add interest on the penalties from the date they accrue, calculated by the IRS at the federal short-term rate + 3 points, updated each quarter. Exentax keeps the case readable for the client, the bank and the adviser at the same time.

How the IRS finds out

The question I get in almost every first call is the same: "how would the IRS even know I exist if I never filed anything?". Short answer: they know, and every year it gets easier. The five concrete channels today are:

EIN under control. If you got an EIN, you are already in their systems. The IRS periodically crosschecks active EINs against returns received. A single-member LLC with an active EIN and no 1120/5472 year after year shows up in their non-filer listings.
US banks and third-party reporting. Mercury, Brex, Wise USD, Relay and similar run KYC on the LLC, hold customer information accessible to the IRS and, depending on the flow and client type, may generate third-party reporting (Form 1099, withholding, FATCA where it applies). An operative LLC moving funds with nothing filed is the pattern that flags reviews.
BOI Report (<a href="https://www.fincen.gov" target="_blank" rel="noopener">FinCEN</a>). Under the current <a href="/en/blog/boi-report-current-fincen-scope-for-llc">BOI Report</a> rules, FinCEN has beneficial ownership mapped for required LLC, and the framework provides for IRS data sharing subject to applicable access rules (regime subject to regulatory change).
CRS and DAC in reverse. When your country of residence receives information on accounts linked to the LLC and the IRS asks for an audit, the crossmatch happens automatically. Some jurisdictions are now performing this match by default. Exentax reviews the case before money, signatures or provider replies move forward.
Your own counterparties. When a US vendor issues a Form 1099 to your LLC, or a counterparty discloses a reportable transaction, your LLC shows up in the IRS system without you having done anything.

The "they will never see me" idea was already weakened by the 2017 reinforcements and, under current BOI rules, is practically untenable. The right baseline is to assume the IRS can open an examination at any time and design your plan accordingly.

The three typical late-filer profiles

In practice the situations we see at Exentax are three, and each one is handled differently:

Profile A: never filed the 5472

You've had the LLC for two, three, five years. You have an EIN, a bank account, you have invoiced. But you never touched the 1120 or the 5472 because "someone told you the LLC doesn't pay tax". The potential exposure is USD 25,000 × number of unfiled years, plus possible 1120 late filing, plus interest.

Profile B: filed late

You realised, you filed late, but before the IRS formally notified you. Here the debate on the 5472 late-filing penalty opens: officially it is still USD 25,000, but the settled practice is that a spontaneous late filing with reasonable cause opens the door to abatement. This is where early action matters most: at Exentax we prepare the reasonable-cause file and fix the record before the authority controls the timeline.

Profile C: filed but wrong

You filed the 1120 and 5472 but with substantially incomplete data: a missing reportable transaction, a wrong TIN on the foreign related party, an undisclosed loan from owner to LLC, an undeclared capital contribution. The 6038A(d) rule is strict: a substantially incomplete return is treated as no return, with the same penalty. Good news: the friendly correction with a written explanation typically resolves better than the previous two. At Exentax we map the exposure early, prepare the reasonable-cause file and reduce avoidable escalation before the authority controls the timeline.

What a "reportable transaction" really is

This is the number-one cause of technically wrong 5472 filings. A reportable transaction is any monetary or non-monetary movement between the LLC and its foreign related party (you, in most cases), including things people don't associate with "a transaction":

Capital contributions from owner to LLC.
Loans from owner to LLC and from LLC to owner (yes, both directions).
Distributions from LLC to owner.
Payments for services, royalties, interest.
Use of assets (including software, trademarks, domains).
Expense reimbursements when the owner pays personally and is reimbursed.
Any accounting entry representing a right or obligation between LLC and owner.

When someone tells me "I had no transactions with my LLC", what's usually there is five or six undocumented reportable transactions. That's exactly Profile C.

The real cycle of an IRS notice

It helps to map what happens once the machine is moving, because each step has its own timing and options:

CP15 / CP215 (notice of penalty). You receive notice of the initial USD 25,000 penalty per form.
Response window (~30 days). Here you decide whether to pay, request abatement on reasonable cause, dispute the math, or escalate to the Office of Appeals.
Expanded examination. If the response is unconvincing, the IRS typically opens an exam over additional years. One penalty becomes three. At Exentax, sensitive steps sit in one controlled workflow, not in scattered notes.
90 days after formal notice. If the form has not been filed and the situation resolved, the USD 25,000 per additional 30 days clock starts.
Final assessment + interest. Once fixed, interest accrues until paid.

Anyone who has been through this knows the decisive moment is the step-2 window. A well-built response there is the difference between zero and dragging six figures around for years.

Reasonable cause: what actually works

The IRS recognises a reasonable cause exception under 6038A. It is not magic: it is a doctrine with criteria. What typically works:

Showing you acted with ordinary care and prudence and the error came from a reasonable cause, not negligence.
Producing correspondence with prior advisors who told you no obligation existed.
Demonstrating that, once you became aware of the obligation, you immediately got current.
Showing the information was available and you filed correct, complete returns when regularising.

What does not work (yet many try):

"I didn't know about the 5472." Insufficient.
"My bank / Stripe / my accountant didn't tell me." Insufficient.
"The LLC had no relevant activity." If there was any reportable transaction, irrelevant.
Filing the abatement request after an incomplete or erroneous regularisation.

This is where a properly drafted statement, with formal structure and references to IRM 20.1.9 and regulation §1.6038A-4, makes the difference.

Streamlined no, but there are routes

Many people confuse the Streamlined Filing Compliance Procedures (a programme for US persons with undeclared foreign accounts) with a missed Form 5472. They are not the same and it does not apply. What does apply to the 5472 are three real routes:

Delinquent international information return submission. Standard procedure to file late international information returns with reasonable cause. Usual route for Profile A and Profile B.
Voluntary Disclosure Practice. Only when there is wilful conduct or criminal exposure. Not normal for a single-member LLC.
Quiet disclosure. Filing late with no explanation. Technically possible, practically discouraged: the IRS treats it as plain late filing and applies the penalty. Exentax gives the obligation a named owner, a due date and supporting evidence.

The difference between the right route and going blind is, literally, tens of thousands of dollars.

The regularisation plan, step by step

When a client comes in with a missed 5472, the work order is always the same:

Real inventory: how many years, what reportable transactions per year, what bank and accounting documentation exists, BOI filed, 1120 filed, returns in the country of residence.
Reconstruction of reportable transactions year by year, including contributions, loans and distributions.
Package preparation: pro forma 1120 for each pending year + 5472 for each pending year + detailed reasonable cause statement.
Submission by certified mail (these packages are not e-filed; the operational address is the Ogden Service Center).
Anticipated response plan for the initial penalty notice: response draft and deadlines prepared before the notice even arrives.
Cleanup of adjacent areas: <a href="/en/blog/boi-report-current-fincen-scope-for-llc">BOI</a>, banking, returns in your country, and above all <a href="/en/blog/existing-llc-checklist-12-items-in-30-minutes">the annual checklist</a> so it doesn't happen again.

Done in that order, the realistic objective is to reduce penalty exposure and keep the file defensible, although the result depends on facts, documentation and IRS agent response. Done badly, it can become five figures and an expanded examination. The Exentax file stays aligned: facts first, documents second, response after that.

Mistakes that multiply the bill

To close on the concrete side, these are the mistakes we see month after month at Exentax that multiply the cost:

Filing the 5472 without the associated pro forma 1120. Invalid.
E-filing the 5472: outside narrow exceptions, it goes by mail and signed.
Generic reasonable cause copied from the internet. The IRS files them as rejection.
Filing only the last few years "to stay quiet". If the obligation existed earlier, the penalty is alive.
Closing the LLC believing that erases the obligation. It does not: the penalty survives dissolution until the statute of limitations runs.
Changing Registered Agent or address without updating the IRS. Notices get lost and the clocks keep running.
Assuming your country of residence shields you. The penalty is the IRS against the LLC; no bilateral treaty eliminates that penalty. The Exentax approach is practical: confirm the data, prepare the evidence and close the next step.

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Conclusion and next step

Form 5472 is one of the few cases where the cost of doing nothing is geometrically higher than doing it right. The USD 25,000 base per year is not negotiable; what is negotiable is how you regularise, in what order, with what argument and which collateral risks you close at the same time.

If you have an LLC and think you might be in any of the three profiles, never filed, filed late, filed but wrong, the rational move is to map your situation with real numbers before the IRS does. In a strategic 30-minute review we go through it with you, tell you which profile you fall into, what your exposure is and which regularisation route is realistic. It is the most controlled move you can make on this topic today.

> <a href="/en/book">Review my structure</a>

Missing Form 5472 is often a record problem before it is a filing problem. Owners forget contributions, reimbursements, distributions or payments because the banking trail was never reviewed.
Statements should identify related-party movements. Money between owner and LLC needs labels and support; otherwise the preparer may miss reportable transactions.
Do not wait for an IRS notice to assemble evidence. Once a penalty or rejection appears, the file should already contain EIN, ownership, statements and transaction explanations.
Exentax reduces penalty risk through calendar and evidence. Filing deadlines, extensions, banking records and required actions are managed as one compliance process.

How Exentax regularizes a missed Form 5472 filing

For Form 5472 risk, Exentax focuses on deadlines, EIN status, related-party movements, owner records and proof that the filing was handled. The issue is not only the penalty amount; it is whether the LLC has a defensible annual file before the IRS asks questions.

Why the Form 5472 penalty escalates faster than other late filings

The Form 5472 penalty has a structure that escalates faster than most other late filings, and the reason is rooted in the form's role within the wider US information regime. The form is designed to give the IRS a clean view of related-party transactions involving foreign owners, and the penalty regime reflects how central that visibility is to the system rather than how complex the form itself is to prepare. The starting amount is fixed per form per year and applies regardless of whether tax was due, and the amount can compound when reminders are not addressed within the statutory windows. Exentax documents that point before it becomes an operational emergency.

Two practical points reduce most of the friction. First, abatement criteria exist when there is a reasonable cause, and a calmly written narrative supported by the original calendar reminders, the engagement letter and the date of first filing usually carries more weight than a longer letter written under pressure later. Second, the cleanest preventive measure is to align the calendar of reminders with the federal extension cycle and to keep a single working file per year that already contains the related-party transaction list, so that the form itself is just the final formatting step.