Form 5472 is two pages long, mostly checkboxes and dollar totals, and it routinely costs startups more than any tax they actually owe. The reason is its penalty design: $25,000 per missed year, assessed without any reference to income, revenue, or tax due. A dormant LLC that earned nothing can owe it. A loss-making Delaware C-corp with a foreign co-founder can owe it. And because the form is unknown to most founders and to plenty of generalist preparers, the typical discovery is not one missed year but three or four, found during diligence when clean international compliance suddenly matters.
This is the deep dive on that one form. For the full picture of a foreign founder's US obligations, including Form 5471, the FBAR, and the substantial presence test, start with our foreign founder tax guide; this article covers the Form 5472 mechanics.
Everything below is drawn from the IRS instructions for Form 5472, current as of mid-2026.
Who Must File
Form 5472 is filed by a "reporting corporation" that had reportable transactions with a related party during the tax year. Both halves of that sentence matter. There are three ways to be a reporting corporation:
A 25 percent foreign-owned US corporation. A US corporation is 25 percent foreign-owned if at least one foreign person owns, directly or indirectly, at least 25 percent of either the total voting power or the total value of its stock at any time during the tax year. One shareholder must individually cross 25 percent; five unrelated foreign angels at 6 percent each do not trigger it, though attribution rules can aggregate related holders. And because the test is any time during the year, a foreign founder who held 40 percent in January and sold down in March still makes the company a reporting corporation for that year.
A foreign corporation engaged in a US trade or business. Relevant mainly for foreign parents operating directly in the US; not the focus here.
A foreign-owned US disregarded entity. A single-member US LLC that has not elected corporate treatment is disregarded for income tax, but if its single owner is a foreign person, the section 6038A regulations treat it as a corporation for this one purpose. This category generates the most startup casualties: these LLCs have no income tax return of their own, no preparer looking at them annually, and owners who reasonably assume a dormant entity has nothing to file.
Run the test against real cap tables. Two co-founders at 50/50, one living in Berlin and not a US tax resident: reporting corporation. A Delaware C-corp wholly owned by a UK parent after a flip: reporting corporation. A US startup where a single foreign venture fund holds 28 percent after the Series A: reporting corporation. A Wyoming LLC formed by a founder in Bangalore to test the US market: reporting corporation in disregarded entity form. And because a shareholder's US tax residency can shift year to year under the substantial presence test, the answer needs rechecking annually, not just at formation.
Being a reporting corporation is necessary but not sufficient: the form is due only for years with reportable transactions, and the IRS instructions provide an explicit exception when there are none. In practice, almost every operating year has at least one.
What Counts as a Reportable Transaction
The form's transaction schedules come in three layers.
Part IV: monetary transactions. Any listed transaction type where money (US or foreign currency) was the sole consideration paid or received between the reporting corporation and a foreign related party: sales and purchases, rents, royalties, license fees, commissions, service charges, interest, and loan principal (amounts loaned and borrowed). Related party is broad: the 25 percent foreign shareholder itself, plus persons related to the reporting corporation or to that shareholder under the attribution rules.
Part V: the expanded list for disregarded entities. For a foreign-owned US disregarded entity only, the instructions add a sweeping category: amounts paid or received in connection with the formation, dissolution, acquisition, and disposition of the entity, including contributions to and distributions from it. This is the clause that catches nearly every foreign-owned LLC. The owner wires in $3,000 to open the bank account: contribution, reportable. The owner pulls cash back out: distribution, reportable. A truly untouched shell with no flows at all can qualify for the no-transaction exception, but the moment money moves between owner and LLC in either direction, the filing is due.
Part VI: non-monetary and less-than-full-consideration transactions. Transactions where consideration was not purely cash, or was less than full value, get described in an attached statement rather than as dollar totals.
Translate that into startup life and the common triggers are:
- Founder capital contributions from abroad. A foreign owner funding a disregarded LLC is making a Part V contribution, reportable in itself; a foreign founder buying stock in a C-corp is captured through the form's ownership reporting. Either way, the year the money lands is a year to check the filing.
- Intercompany charges. A US entity paying a foreign parent or sibling for engineering services, or charging a management fee the other direction, or paying royalties under an IP license after a flip. Each category gets its own line and its own dollar total.
- Loans. Founder loans to the company, parent-subsidiary cash management, and convertible instruments held by a foreign related party can all create amounts borrowed, amounts loaned, and interest lines. Informal transfers that nobody documented are the worst case, because someone must characterize them retroactively at filing time.
One useful exception: a reporting corporation can skip Form 5472 for a related foreign corporation when a US person in control of it files Form 5471 with a Schedule M covering the same transactions. That relief explicitly does not apply to foreign-owned disregarded entities.
The Pro Forma 1120: How a Disregarded LLC Actually Files
Form 5472 is not a standalone filing. It attaches to the reporting corporation's income tax return. For a C-corp that is simple: the 5472 rides along with the Form 1120, e-filed with everything else.
A disregarded LLC has no income tax return, so the IRS built a carrier for it: the pro forma Form 1120. The mechanics, straight from the instructions:
- Complete only the top of Form 1120: the entity's name and address, plus items B (employer identification number) and E (date incorporated) on page one. No income, no deductions, no tax. The rest of the return stays blank.
- Write "Foreign-owned U.S. DE" across the top of the Form 1120.
- Attach the completed Form 5472, including Part V for the contribution and distribution amounts.
- File by fax (300 DPI or higher) to 855-887-7737, or by mail to Internal Revenue Service, 1973 Rulon White Blvd, M/S 6112, Attn: PIN Unit, Ogden, UT 84201.
Two practical consequences follow. First, a foreign-owned disregarded entity cannot e-file Form 5472; the fax and the Ogden mailing address are the only channels, so keep the fax confirmation or certified mail receipt as proof, because no acknowledgment comes back. Second, the LLC needs its own EIN to complete item B even though it files no income tax return; a foreign owner without a Social Security number can still get one, and the foreign founder guide walks through the Form SS-4 phone and fax routes.
The disregarded entity uses the same tax year as its foreign owner uses for US filing purposes, or the calendar year if the owner has none. For nearly every founder-owned LLC that means a calendar year.
Deadlines and Extensions
Form 5472 is due when the return it attaches to is due, including extensions. For a calendar-year filer:
| Filer | Base due date | Extension | Extended due date |
|---|---|---|---|
| C-corp (Form 1120 with 5472 attached) | April 15 | Form 7004, automatic 6 months | October 15 |
| Foreign-owned disregarded LLC (pro forma 1120 with 5472) | April 15 | Form 7004, filed by fax or mail to the Ogden unit | October 15 |
The general rule for Form 1120 is the 15th day of the 4th month after year end (with a special accelerated date for fiscal years ending June 30), and Form 7004 must be filed by the unextended due date to work.
The extension wrinkle for disregarded LLCs deserves emphasis: the LLC's Form 7004 cannot go through normal channels either. The instructions direct the entity to write "Foreign-owned U.S. DE" across the top of the Form 7004, enter the code for Form 1120 on Part I, line 1, and fax or mail it to the same 855-887-7737 number or Ogden address as the return itself, by the unextended due date.
For where these dates sit in the broader compliance year, see the 2026 startup tax deadline calendar.
The Penalty Math
Now the part that justifies the article. All figures below are from the IRS instructions for Form 5472.
The base penalty is $25,000 per failure. It is assessed on any reporting corporation that fails to file Form 5472 when due and in the manner prescribed. Three things count as failures beyond simply not filing: filing late, filing a substantially incomplete form, and failing to maintain the required records (that last one is its own separate $25,000). "In the manner prescribed" matters too: a disregarded LLC that e-files or mails to the wrong service center has arguably not filed in the manner prescribed.
The continuation penalty is uncapped. If the failure continues for more than 90 days after the IRS mails notification, an additional $25,000 applies for each 30-day period, or any part of one, that the failure continues past the 90-day mark, and it applies per related party. Unlike the parallel Form 5471 penalty, which caps its continuation component at $50,000, the instructions state no ceiling for Form 5472. Ignore an IRS notice for a year and the arithmetic runs past $300,000 for a single entity-year, per related party.
Failures multiply across years and entities. Each tax year is a separate failure. Each member of a consolidated group is a separate reporting corporation subject to its own separate $25,000. A founder who ran a foreign-owned LLC for four years before learning the rule is looking at $100,000 of base exposure before any notices.
Criminal exposure exists at the margin. The instructions note that criminal penalties under sections 7203, 7206, and 7207 can apply for failure to submit information or for filing false or fraudulent information. For ordinary missed filings this is theoretical; for deliberately falsified ones it is not.
Set that against a few hundred to a couple thousand dollars of preparer time to do it right, and Form 5472 has perhaps the worst risk-to-effort ratio in the startup compliance stack.
How to Actually Prepare It
The form itself asks for identifying information and dollar totals. The work is in the records behind them. Section 6038A requires a reporting corporation to keep permanent books and records sufficient to establish the correct treatment of transactions with related parties, and remember that failing to keep them draws the same $25,000 as failing to file. What that means concretely:
- A related-party map. Who the 25 percent foreign shareholders are, direct and indirect, with ownership percentages and each one's country of organization or citizenship. The form wants identifying details for the shareholder and for each related party transacted with, including a US or foreign taxpayer identification number or, failing that, a consistent reference ID number.
- A transaction ledger by counterparty and category. For each foreign related party, the year's totals by type: services in, services out, interest, royalties, loan draws and repayments, contributions, distributions. If your bookkeeping tags related-party flows to separate accounts all year, preparation takes an hour; if not, someone reconstructs it from bank statements in April.
- Intercompany agreements in writing. A services agreement, a loan note with a stated rate, an IP license. These characterize the flows, which determines which line each dollar lands on, and they are the documents an examiner asks for first. Whether the pricing itself is defensible is a transfer pricing question beyond this article, but the agreements are step one either way.
- Formation and funding papers for LLCs. Wire confirmations for every owner contribution and distribution, plus formation costs, since Part V wants those amounts.
- Proof of filing. Fax confirmations or certified mail receipts for every year, kept with the returns.
A C-corp's preparer handles the form inside the 1120 engagement; the recurring gap is the standalone LLC that has no engagement at all. Give it one: a calendar entry, an owner, a folder for the wire confirmations.
Common Startup Mistakes
The same handful of errors account for most of the penalty letters we see:
Assuming a dormant LLC has no filings. The formation-and-contribution rule in Part V means the funding wire itself creates the obligation. This is the single most common miss, and it compounds silently at $25,000 a year.
Missing the 25 percent test after a financing. The company was fine at incorporation, then a foreign fund took 30 percent in the seed round, and nobody reran the analysis. The test belongs in post-round cleanup, every round.
Missing a founder's residency change. A co-founder moves abroad and gives up US tax residency, or was never a resident and the company assumed otherwise. The filing obligation follows the shareholder's status.
E-filing or misaddressing the disregarded entity return. The pro forma 1120 package accepts only the fax number or the Ogden PIN Unit address. A return that went elsewhere may be treated as never filed, which is the full penalty for an entity that thought it complied.
Filing a hollow form. Names filled in, transaction schedules blank or guessed. A substantially incomplete Form 5472 is a failure by rule, so a placeholder buys nothing.
Assuming no tax due means no deadline. The failure mode is the LLC whose owner filed no Form 7004 because there was no tax to pay, not realizing an information return was riding on that due date.
If you are still choosing a structure, this regime is one of the quiet arguments for the standard Delaware C-corp over an LLC for foreign founders; the Delaware C-corp tax guide covers the domestic filing stack that choice buys you.
If You Have Already Missed a Filing
Found the problem before the IRS did? That is the good version, and there are established paths, described qualitatively because eligibility turns on facts.
Reasonable cause. The Form 5472 penalty can be abated where the taxpayer shows the failure arose despite ordinary business care and prudence. Prompt correction on discovery, reliance on a competent professional who was given the full facts, and a first year of US exposure all help the argument; bare ignorance of the requirement, standing alone, generally does not carry it.
Delinquent international information return submission procedures. Taxpayers who are not under IRS examination and have not been contacted about the missing returns can file the delinquent forms according to their instructions, generally attached to an amended return where applicable, with a reasonable cause statement. Be clear-eyed about the guidance: penalties may still be assessed in accordance with existing procedures, and during processing they may be assessed without the statement being considered, with the reasonable cause case made afterward in response. The statement therefore needs to be written to survive scrutiny, not dashed off.
Sequencing matters. The first submission fixes your posture, and quiet-filing several years at once without a strategy can turn one conversation with the IRS into four. This is the moment for a cross-border CPA, before anything goes in the mail. What StartupCFO adds around that specialist work is the prevention layer: our tax and compliance service keeps the 25 percent test, the entity inventory, and the Ogden deadlines on a tracked calendar so the delinquency procedures stay theoretical.
The Bottom Line
Form 5472 is a disclosure form with a penalty engine attached. The filing test is mechanical: one foreign person at 25 percent of vote or value, or a foreign-owned single-member LLC. The trigger is nearly universal: money moving between the company and a foreign related party, including the wire that funded the entity. The cost of compliance is an afternoon and a fax machine; the cost of ignorance is $25,000 per entity per year, uncapped once notices start. Put every reporting corporation in your structure on a calendar with an owner and the form goes back to being a formality.
This article is general information, not tax or legal advice. Form 5472 sits inside section 6038A regulations with attribution rules, exceptions, and relief procedures whose application depends entirely on specific facts, and penalty exposure of this size warrants specific advice. Before filing, and especially before fixing a missed year, engage a CPA who practices cross-border compliance as a specialty.
