Form 5472 Penalties ($25,000), Deadlines, and Extension Rules (2025-2026)

What is the deadline for filing Form 5472?

Form 5472 is due on the same date as the income tax return to which it is attached. For foreign-owned single-member LLCs filing the pro forma Form 1120, the due date is April 15 following the end of the calendar year (or the 15th day of the 4th month after the fiscal year ends).

For example, for the 2025 tax year (January 1 - December 31, 2025), Form 5472 with the pro forma 1120 is due by April 15, 2026.

Can I get an extension to file?

Yes. You can request an automatic 6-month extension by filing Form 7004 (Application for Automatic Extension of Time to File Certain Business Income Tax, Information, and Other Returns) by the original due date.

For foreign-owned U.S. disregarded entities, write "Foreign-owned U.S. DE" across the top of Form 7004 and use the Form 1120 code on Part I, line 1. Submit the extension to the same address as the return — the dedicated Ogden, UT address or via fax.

With the extension, the filing deadline is pushed to October 15 (for calendar-year filers). The extension is automatic — you do not need to provide a reason.

What is the penalty for not filing Form 5472?

The penalty for failure to file Form 5472 timely and in the manner prescribed is $25,000 per form. Since a separate Form 5472 is required for each related party, the penalty applies per form.

For a typical foreign-owned single-member LLC with one foreign owner, this means a $25,000 penalty for missing the filing deadline — even if the LLC had zero income.

Importantly, filing a substantially incomplete Form 5472 is treated the same as not filing at all. Simply submitting a blank or mostly blank form will not avoid the penalty.

What happens if I still don't file after the IRS notifies me?

If the failure to file continues for more than 90 days after the IRS mails a notice of failure, an additional $25,000 penalty is imposed for each related party for each 30-day period (or fraction thereof) that the failure continues.

This means the penalties can escalate rapidly. For example, if you ignore the IRS notice for 120 days, you would face the initial $25,000 plus an additional $25,000 (for the 30-day period beyond the 90-day grace period) — totaling $50,000 for a single form.

In addition to civil penalties, criminal penalties may apply under Sections 7203 (failure to file), 7206 (fraud), and 7207 (fraudulent returns).

Is there a penalty for failure to maintain records?

Yes. The same $25,000 penalty applies to reporting corporations that fail to maintain records as required by Regulations Section 1.6038A-3. The IRS requires that you maintain permanent books and records sufficient to establish the correctness of your return and to document all related-party transactions.

For a foreign-owned LLC, this means keeping bank statements, invoices, receipts, loan agreements, and any documentation of transactions between you and the LLC.

Can I get penalty relief if I missed the deadline?

The IRS may waive or reduce the penalty if you can show reasonable cause for the failure to file. Reasonable cause generally means that you exercised ordinary business care and prudence but were still unable to file on time.

Common examples of reasonable cause include reliance on a tax professional who failed to file, serious illness, natural disaster, or inability to obtain necessary records despite diligent efforts.

Simply not knowing about the filing requirement is generally not accepted as reasonable cause. However, if you file voluntarily before the IRS contacts you, and you can demonstrate good faith, you have a stronger argument for penalty abatement.