Missed Form 5472? Penalties and What to Do Next

Short answer

If you missed a Form 5472 deadline, file the form as soon as you can. The IRS penalty for a Form 5472 that is not filed when due and in the manner prescribed is $25,000. More penalties apply if the failure continues more than 90 days after an IRS notice. Filing late does not guarantee the IRS will cancel a penalty, but it ends the failure that causes the continuation penalties.

Many foreign owners of a U.S. LLC learn about Form 5472 only after the deadline has passed. The form is not hard to file once the records are in order. The penalties are the part that needs attention. This guide explains what the IRS penalty covers, how to check which deadline applies to you, and what to do if you are already late.

The penalty amounts and filing rules come from the IRS instructions for Form 5472 and the IRS pages on delinquent international returns, linked at the end. For the basic rules on who files and what counts, see our main Form 5472 guide.

What the IRS penalty covers

The Form 5472 instructions set out the following penalties. They are assessed by the IRS, so the amounts depend on what the IRS actually decides to assess.

Situation	Penalty under the Form 5472 instructions
Form 5472 not filed when due and in the manner prescribed	$25,000
A substantially incomplete Form 5472	Treated as a failure to file, so the same $25,000 penalty
The failure continues more than 90 days after an IRS notice	An additional $25,000
Each 30-day period (or part of one) after that 90-day period	An additional $25,000 for each related party with a failure

The instructions also say that criminal penalties under Sections 7203, 7206 and 7207 of the Internal Revenue Code may also apply to a failure to submit information or to filing false or fraudulent information. The instructions also treat a substantially incomplete Form 5472 as a failure to file, so check that the form is complete before you send it.

Check which deadline applies

For a calendar-year LLC, Form 5472 is filed with a pro forma Form 1120, and it must be filed by the due date of that return, including extensions. The IRS instructions for Form 1120 say that a corporation generally files its return by the 15th day of the 4th month after its tax year ends. For a calendar year, that is April 15.

Form 7004 gives an automatic 6-month extension of time to file certain business income tax, information and other returns. A foreign-owned U.S. LLC that extends its pro forma Form 1120 with Form 7004 therefore has until October 15 for a calendar year.

This matters now. If the 2025 Form 5472 was never filed, the extended deadline was October 15, 2026, and that date has passed. For the 2026 tax year, the original due date is April 15, 2027, and the extended date is October 15, 2027.

How to file a late Form 5472

Gather the records for each year you missed. You need the Form 5472 and the pro forma Form 1120 for that year, with a list of every transaction between the LLC and its foreign owner or other related parties.
Do not e-file. The IRS says a foreign-owned U.S. disregarded entity cannot file Form 5472 electronically. Send it 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.
Use the dedicated address. The IRS says a foreign-owned U.S. disregarded entity must not use the mailing address for the Form 1120.
Decide on a reasonable cause statement. The IRS procedures for delinquent international information returns say a reasonable cause statement is optional. For most returns, the IRS says penalties may be assessed without considering the statement at first. If you attach one, write "Reasonable Cause Statement attached" on the first page. Only attach a statement that you can support with real facts. The IRS procedures page does not mention Form 5472 by name, so ask a tax professional whether this option fits a foreign-owned LLC before you use it.
Keep proof of sending. Save the fax confirmation or the mailing receipt with a copy of what you sent.
Answer IRS letters on time. The IRS may send correspondence, and the IRS procedures page says you may need to respond and resubmit reasonable cause information.

Can the Form 5472 penalty be reduced or abated?

Relief is possible in some cases, but it is not guaranteed. The Form 5472 instructions do not mention reasonable cause relief. The IRS procedures for delinquent international information returns say penalties may be assessed under existing procedures. If you send a reasonable cause statement, the IRS may not consider it when the return is first processed, so you may need to respond to a later letter.

Do not assume a penalty will be removed because you filed late. Keep your records, file as soon as you can, and respond to every IRS letter in writing before the date it gives.

Why an LLC should not wait

The continuation penalties depend on the failure continuing after an IRS notice. Filing the missing forms stops the failure. Waiting does not reduce the risk, and the longer a return stays unfiled, the harder it is to rebuild the records for prior years. A compliance review can show which years are open and which forms you still need.

How Top Accounting Firm can help

Our foreign-owned U.S. LLC services include the yearly Form 5472 with the pro forma Form 1120, and our compliance services track filings and deadlines for small businesses. If you are not sure which years are open, book a free consultation and bring the LLC formation papers and any IRS letters you have received.

Frequently asked questions

Is there a penalty for filing Form 5472 late?

Yes, if the form is not filed when due and in the manner prescribed. The IRS instructions for Form 5472 set the penalty for failing to file at $25,000.

Can I e-file a late Form 5472?

No. The IRS says a foreign-owned U.S. disregarded entity cannot file Form 5472 electronically. Send it by fax to 855-887-7737 or by mail to the dedicated IRS address in the instructions.

Will filing late cancel the $25,000 penalty?

Not necessarily. The IRS says penalties may be assessed under existing procedures. Filing promptly stops the failure, which matters because the 90-day and 30-day continuation penalties apply only while the failure continues after an IRS notice.

Does a reasonable cause statement guarantee relief?

No. The IRS says a reasonable cause statement is optional, and for most returns it may not be considered when the return is first processed. You may need to respond to IRS correspondence later.

What if I missed the 2025 Form 5472?

For a calendar-year return extended with Form 7004, the extended due date was October 15, 2026, which has passed. File the missing form as soon as possible, using the fax or mail address in the IRS instructions.

Do I need to file Form 5472 if the LLC had no sales?

The filing depends on reportable transactions with related parties, not on sales alone. Our main Form 5472 guide explains what counts, and a tax professional should review your records before you decide not to file.

Sources

Checked against these sources on October 28, 2026. This article is general information, not tax or legal advice. Rules, fees and deadlines change, so confirm with the official source or a tax professional before you file.