Form 5472 Common Mistakes: Avoid These Costly IRS Filing Errors

Not filing because the LLC had no income

This is the most common and most expensive mistake. Many foreign LLC owners believe that if their LLC did not earn any revenue during the year, they have no filing obligation. This is wrong.

The filing requirement is triggered by reportable transactions — not income. If you contributed money to the LLC (even just to open a bank account), paid for the LLC's registered agent fee, or covered any LLC expense out of personal funds, you had a reportable transaction.

In practice, virtually every foreign-owned LLC has at least one reportable transaction per year. The $25,000 penalty applies regardless of whether the LLC earned any income.

Filing a substantially incomplete Form 5472

The IRS explicitly states that filing a substantially incomplete Form 5472 constitutes a failure to file. This means submitting a mostly blank form does not protect you from the $25,000 penalty.

Common examples of substantially incomplete filings include: leaving Part II (foreign shareholder information) entirely blank, failing to report known transactions in Parts IV or V, not including the related party information in Part III, or submitting the form without the required pro forma Form 1120.

Every applicable section must be completed with accurate information.

Not completing Part IV when the related party is a foreign person

The form explicitly states that Part IV 'must be completed' if the 'foreign person' box is checked in Part III. Some filers leave Part IV entirely blank — this contradicts the form's own instruction and could be viewed as a substantially incomplete filing.

For transaction lines where no activity occurred, enter '0' to show you reviewed each line and confirmed no transactions of that type. This demonstrates the section is complete as required. Leaving every line blank looks like you skipped the section, which is harder to defend if the IRS questions your filing.

If estimates are used for any amounts, check the estimates box in the Part IV heading.

Forgetting to write "Foreign-owned U.S. DE" on Form 1120

Foreign-owned disregarded entities must write "Foreign-owned U.S. DE" across the top of the pro forma Form 1120. This signals to the IRS that the 1120 is not a full corporate tax return but rather a cover sheet for the attached Form 5472.

Without this notation, the IRS processing center may treat your filing as a regular Form 1120 submission, potentially causing processing errors, delays, or misrouted correspondence.

Mailing to the wrong address

Foreign-owned U.S. disregarded entities have a dedicated mailing address that is different from the standard Form 1120 filing address. The correct address is:

Internal Revenue Service 1973 Rulon White Blvd M/S 6112, Attn: PIN Unit Ogden, UT 84201

Mailing to the standard IRS processing center for Form 1120 can result in your return being lost, delayed, or never processed — which the IRS treats as a failure to file.

Not using consistent Reference ID Numbers

If your foreign owner does not have a U.S. tax identification number, you must assign a Reference ID Number — an alphanumeric identifier up to 50 characters long with no special characters or spaces.

The critical rule is consistency. You must use the same Reference ID Number for the same shareholder every year. If you change it, the IRS cannot match current-year filings with prior years, which may trigger penalties or examination.

If ownership changes and a new Reference ID is assigned, you must correlate it with the previous ID using the format: "New reference ID [space] Old reference ID."

Missing the filing deadline without requesting an extension

The due date is April 15 for calendar-year filers. If you know you cannot file by then, you must file Form 7004 before April 15 to get an automatic 6-month extension to October 15.

Many foreign LLC owners miss the April 15 deadline without filing an extension, which immediately triggers the $25,000 penalty. Filing Form 7004 is free and automatic — there is no reason not to request an extension if you need more time.

Remember to write "Foreign-owned U.S. DE" on Form 7004 and send it to the same Ogden, UT address or fax number.

Not obtaining an EIN before filing

You cannot file Form 5472 without an EIN (Employer Identification Number) for the LLC. Every foreign-owned LLC needs its own EIN — this is true even if the LLC has no employees.

Foreign owners often struggle to obtain an EIN because the IRS online application requires a U.S. SSN or ITIN, which foreign owners typically do not have. Foreign applicants must file Form SS-4 by mail or fax, which can take 4-8 weeks.

Plan ahead. If you formed an LLC in October, do not wait until March to apply for an EIN — you may not receive it in time for the April 15 deadline.

Entering the wrong country on Line 1n (country of tax residence)

Line 1n asks for the countries under whose laws the reporting corporation files an income tax return as a resident. This is one of the most confusing fields on Form 5472 for foreign-owned disregarded entities, and getting it wrong could contribute to a substantially incomplete filing.

The correct answer is "United States." Here is why the other common answers are wrong:

Putting the foreign owner's country (e.g., China, Canada, UK) is incorrect because Line 1n asks about the reporting corporation — the LLC — not the owner. The LLC itself does not file an income tax return in the owner's home country.

Leaving it blank or entering "None" is risky because the IRS treats the disregarded LLC as a domestic corporation for Form 5472 purposes. The pro forma Form 1120 is filed with the IRS, a U.S. tax authority. The IRS created this legal fiction — follow it consistently across the entire form. A blank field in Part I could be viewed as a substantially incomplete filing.

The IRS instructions for Form 5472 do not provide a specific carve-out or exception for disregarded entities on this line. Since the form requires the LLC to be treated as a corporation, and that corporation files its pro forma return with the IRS in the United States, "United States" is the answer that is consistent with the IRS's own framework and carries the lowest compliance risk.