Tax Talk Thursday: Form 5471 for Foreign-Owned U.S. Companies - Your 2018–2025 Exposure and What Changes in 2026

If your company is the U.S. arm of an overseas group — a sales or distribution subsidiary of a manufacturer in Taiwan, Japan, Korea, or China — your tax preparer almost certainly files Form 5472 to report transactions with your foreign parent. The question fewer people ask: should your company also have been filing Form 5471 for its foreign sister companies?

From 2018 through 2025, for many foreign-owned U.S. companies, the answer may have been yes — even though the U.S. company never owned a single share of those affiliates.

How a U.S. Subsidiary Became a "Shareholder" of Companies It Didn't Own

U.S. tax law uses constructive ownership rules to decide who counts as a "U.S. shareholder" of a foreign corporation. One of those rules, downward attribution, treats a subsidiary as owning whatever its parent owns.

Before 2018, Internal Revenue Code §958(b)(4) blocked that rule when the stock would flow from a foreign person down to a U.S. person. The 2017 Tax Cuts and Jobs Act repealed §958(b)(4). The result:

•        A foreign parent owns 100% of a U.S. subsidiary and 100% of several foreign subsidiaries.

•        The U.S. subsidiary is treated as constructively owning 100% of each foreign sister company.

•        Each foreign sister company becomes a controlled foreign corporation (CFC), and the U.S. subsidiary may become a Form 5471 filer for each one.

The IRS Offered Relief — But Not for Everyone

The IRS recognized the collateral damage and issued Rev. Proc. 2019-40, along with exceptions in the Form 5471 instructions for certain filers whose ownership was purely constructive. Many U.S. subsidiaries qualified. Some didn't.

The exceptions turn on details: whether any U.S. person owned the foreign affiliate directly or indirectly, how the group was structured, and which filer category applied. A U.S. company — or a U.S.-resident executive — that held even a small direct stake somewhere in the group could fall outside the relief.

If no one ever documented why your company did not need to file Form 5471 for 2018–2025, that analysis is worth doing now. "Our preparer never mentioned it" is not the same as "we qualified for an exception."

What's at Stake

•        $10,000 per Form 5471, per year. A U.S. subsidiary with five foreign sister companies across eight years (2018–2025) has 40 potential forms — $400,000 in theoretical base penalties.

•        An open statute on every Form 1120. Under §6501(c)(8), the statute of limitations for the entire return generally stays open until three years after the missing information is filed. If the failure was due to reasonable cause, the extension is limited to related items.

•        Systemic assessment risk. When a Form 5471 arrives attached to a late return, the IRS has been known to assess the penalty automatically.

•        Separate Form 5472 exposure. Foreign-owned U.S. corporations already face a $25,000 penalty per Form 5472. A review of one form often surfaces issues with the other.

What Changes in 2026

The One Big Beautiful Bill Act (P.L. 119-21) restored §958(b)(4) for foreign corporation tax years beginning after December 31, 2025. For many foreign-owned U.S. subsidiaries, constructive ownership of foreign sister companies goes away — and so does the Form 5471 obligation that came with it.

Three cautions before you stop filing:

1.     It's prospective only. Tax years 2018–2025 are still governed by the TCJA-era rules.

2.     New §951B keeps downward attribution alive in certain structures. It targets "foreign controlled United States shareholders" of "foreign controlled foreign corporations." Some U.S. companies will keep a filing requirement — and some may pick up a new one.

3.     Income inclusions are narrower than filing requirements. Under §951B, a filing obligation can exist even where there is generally no income inclusion unless the U.S. person owns the foreign affiliate directly or indirectly. That distinction matters for both 2026 planning and prior-year cleanup.

Cleaning Up 2018–2025

For many foreign-owned U.S. subsidiaries, the exposure is purely an information-return problem: the U.S. company owned nothing directly, so there was no Subpart F or GILTI income to report. That fact pattern often fits the Delinquent International Information Return Submission Procedures (DIIRSP):

•        Available when there is no unreported income and the IRS has not contacted the company about the missing forms

•        Requires a reasonable cause statement for each delinquent form

•        Penalties are not automatically waived, but strong reasonable cause facts carry real weight here

Reasonable cause facts that tend to matter for these companies:

•        The filing requirement arose from a change in law that reversed decades of prior rules

•        The U.S. company had no ownership, control, or access to the foreign affiliates' books

•        The company relied on a preparer who was informed of the group structure

•        The company acted promptly once the issue was identified

If a U.S. company did own foreign stock directly or indirectly — and missed income inclusions — the analysis shifts toward amended returns and a different remediation path.

A Quick Self-Check for Controllers and CFOs

1.     Is your U.S. company owned 50% or more by a foreign parent?

2.     Does the parent own other foreign companies?

3.     Does your U.S. company, or any U.S.-resident officer or family member, own any shares in those foreign affiliates — even a small percentage?

4.     Did anyone document a Form 5471 exception for 2018–2025?

5.     Has anyone reviewed your 2026 structure under new §951B?

If you answered yes to the first two questions and no or "I don't know" to the last two, a review is worth scheduling.

The 2026 fix is good news for most foreign-owned U.S. companies going forward. It does nothing for 2018–2025, and those years don't close on their own.

1.     Map the group structure, including every foreign affiliate and any U.S. persons with direct or indirect ownership.

2.     Document your 2018–2025 position — either the exception you relied on or the forms you need to file.

3.     Quantify the exposure before choosing a path: number of forms, years, and any missed income inclusions.

4.     Review 2026 under §951B before dropping any filing.

5.     Act before the IRS does. DIIRSP is unavailable once the IRS contacts you about the missing forms.

MKHS Tax Group helps foreign-owned U.S. companies review their Form 5471 position for 2018–2025, prepare delinquent filings and reasonable cause statements, and plan for the 2026 rules. Email us at info@mkhstaxgroup.com to schedule a structure review.

CPA and EA firms: if you serve foreign-owned U.S. companies and don't prepare Form 5471 in-house, we partner with firms to handle the international filings while you keep the client relationship.