Single-owner foreign entities and branches
Form 8858 for Foreign Branches and Foreign Disregarded Entities
A single-owner foreign entity that is disregarded for US tax, or a business operated abroad as a branch, can require Form 8858 every year. Gurleen Kaur, CPA licensed in British Columbia and Washington State, confirms the classification and prepares the filing.
Quick answer
Who files Form 8858?
Under the Form 8858 instructions, certain US persons who operate a foreign branch or own a foreign disregarded entity file Form 8858. A US person that is directly the tax owner of a foreign disregarded entity, or operates a foreign branch, at any time during the year is a Category 1 filer and completes the full form and Schedule M. Other categories cover indirect ownership through controlled foreign corporations and partnerships. Failures can bring US$10,000 penalties, up to US$50,000 more after IRS notice, and a 10% reduction of foreign taxes available for credit.
Who files
Source: Form 8858 instructions. A foreign entity is only disregarded if its US classification makes it so, by default or by election.
| Filer | What it means |
|---|---|
| Category 1 | A US person that is directly the tax owner of a foreign disregarded entity, or operates a foreign branch, at any time during its tax year |
| Other categories | US persons connected through a controlled foreign corporation or controlled foreign partnership that owns a foreign disregarded entity or branch, as listed in the instructions |
| Schedule M | Reports transactions between the foreign disregarded entity or branch and the filer or related entities |
Penalties
A US$10,000 penalty can apply for failure to furnish required information, with a further US$10,000 per controlled foreign corporation or partnership for each 30-day period after 90 days from an IRS notice, up to US$50,000. Failure to file can also reduce the foreign taxes available for credit by 10% (IRS).
What to gather
- Formation documents and any US classification election
- Financial statements translated to US dollars
- Transactions with the owner and related parties
- Foreign taxes paid
Behind on Form 8858?
If the IRS has not contacted you, late information returns are generally attached to an amended return under the delinquent international information return procedures, with a reasonable-cause statement. The IRS states that penalties may still be assessed during processing. Compare your options in our catch-up guide.
Common questions
What is a foreign disregarded entity?
A foreign entity with a single owner that is treated as disregarded from its owner for US tax, either by default or because of an entity classification election.
Do I file Form 8858 for a branch of my US company in Canada?
A US person that operates a foreign branch at any time during the year is generally a Category 1 filer and completes the full form and Schedule M.
What is the penalty for not filing Form 8858?
US$10,000 for failure to furnish the information, plus further US$10,000 penalties after an IRS notice up to US$50,000, and a possible 10% reduction in foreign taxes available for credit.
Is Form 8858 the same as Form 5471?
No. Form 5471 covers foreign corporations; Form 8858 covers foreign disregarded entities and branches. An entity's US classification decides which applies.
Does Form 8858 apply to a foreign-owned US LLC?
No. A US LLC owned by a foreign person is a domestic entity; it may need a pro forma Form 1120 and Form 5472 instead.
How do I fix missed years?
If the IRS has not contacted you, late forms are generally filed with an amended return and a reasonable-cause statement, though penalties may still be assessed.
Sources
Every rule and figure on this page links to the IRS, CRA or other official source it comes from. Amounts change; we re-check them before each engagement.
- IRS: Instructions for Form 8858
- IRS: Delinquent international information return submission procedures
Gurleen Kaur, CPA licensed in British Columbia and Washington State. Last updated October 21, 2026. This page is general information, not tax or legal advice for your situation.
Related guides: Form 5471, Form 8865, Form 5472, Expanding to the US.
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