Form 8858: Reporting a Foreign Disregarded Entity
Published November 7, 2026
Form 8858 is an information return for a U.S. person who owns a foreign disregarded entity (FDE) or operates a foreign branch. An FDE is an entity that is not created or organized in the United States. It is also disregarded as separate from its owner for U.S. income tax purposes. A single-owner foreign company that is treated as part of its U.S. owner is a common example.
The Instructions for Form 8858 (Rev. December 2024) explain the rules. This post is general information. It does not tell you how to file your own return.
What the form reports
Form 8858 reports information about the FDE or foreign branch. Its schedules cover items such as income, balance sheet amounts, and transactions between the entity and its owner or related entities. The separate Schedule M reports those transactions.
Some amounts are stated in the entity's functional currency. The instructions ask the filer to enter a three-letter currency code on certain lines.
What a foreign branch is
A foreign branch is a trade or business that a U.S. person runs outside the United States, as the regulations describe it. The instructions note that a separate set of books and records can affect whether an activity qualifies as a foreign branch. So the books matter, even when the form is about a branch.
Who must file
The main filer is simple. A U.S. person that is directly the tax owner of an FDE, or that operates a foreign branch, at any time during the tax year must file. That person completes the whole form, including Schedule M.
A U.S. person who owns the FDE through one or more other FDEs is also a filer. Certain U.S. owners of a controlled foreign corporation or a controlled foreign partnership that owns an FDE must file too. Those owners usually report on Form 5471 or Form 8865, with Form 8858 attached.
When and where to file
Form 8858 is due when the owner's income tax return or information return is due, including extensions. If you are the tax owner, you attach the form to your return. If you are not the tax owner, you attach Form 8858 to any Form 5471 or Form 8865 you file for the foreign company that owns the FDE.
Electronic filing has its own rules. For a Form 1120 or Form 1065, Form 8858 is attached electronically to that return. For a Form 1040, Form 1040-SR, or Form 1041 filed electronically, the form is attached to Form 8453.
Penalties
The penalty for failing to file the required information is $10,000 for each annual accounting period of each controlled foreign corporation (CFC) or controlled foreign partnership (CFP). If the information is still missing 90 days after the IRS mails a notice, an extra $10,000 applies for each 30-day period. The extra penalty is capped at $50,000 for each failure.
A failure can also reduce the foreign tax credit. The reduction is 10% of the foreign taxes available for credit. If the failure continues 90 days or more after the IRS notice, an extra 5% reduction applies for each three-month period. Criminal penalties may apply in some cases.
Keep your records
Keep the entity's books and records for the year. Each amount on the form should trace back to a record. For how long to keep tax records in general, see How Long Should I Keep My Tax Records?.
Related posts
An entity's tax classification is set on Form 8832. See Form 8832: Choosing How Your LLC Is Taxed. For owners of foreign corporations, see Form 5471: Reporting Interests in Foreign Corporations.
Checklist
- Confirm the entity was not organized in the United States and is disregarded for U.S. tax purposes.
- Identify the tax owner, and note whether the ownership is direct or through other entities.
- Attach Form 8858 and Schedule M to the right return, or to Form 5471 or Form 8865.
- Count the due date, including any extension.
- Keep the records that support each amount.
This is general information only. It is not tax advice for your situation.
Sources: Sources: IRS, Instructions for Form 8858 (Rev. December 2024; use with the December 2024 revision of Form 8858) (https://www.irs.gov/pub/irs-pdf/i8858.pdf) This is general information, not advice about your specific return.
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