Form 8858: Information Return of US Persons With Respect to Foreign Disregarded Entities and Foreign Branches

Who Files Form 8858

US persons (individuals, partnerships, corporations) that own a foreign entity classified as disregarded for US tax purposes (a single-member foreign LLC equivalent), or that operate a Foreign Branch of a US business through unincorporated foreign operations.

What Form 8858 Reports

Form 8858 reports the income statement, balance sheet, GILTI inclusion (when the FDE is owned through a CFC), and transactions between the FDE and related parties. The form is filed with the owner's annual return and integrates with Form 5471 (when the FDE is owned through a CFC) and Form 8865 (when owned through a foreign partnership).

Key Deadlines

• Filed with the personal Form 1040 (April 15) or entity return: same deadline as the underlying return

Common Mistakes

• Missing the Form 8858 requirement for a single-member foreign LLC owned by a US person
• Failing to file Form 8858 alongside Form 5471 when the foreign disregarded entity is owned through a CFC
• Treating a foreign branch as a separate corporation for US tax purposes
• Missing GILTI / Subpart F integration when the FDE is owned through a foreign corporation

Best Practices

• File Form 8858 alongside Form 5471 when the foreign disregarded entity is owned through a CFC. The two forms work together; missing 8858 alone triggers separate penalties.
• For a single-member foreign LLC owned directly by a US person, Form 8858 is filed with Form 1040.
• Track the foreign branch capital account separately from the home-country US branch. This drives the Section 987 currency-translation calculations.
• Coordinate with Form 8865 if the foreign disregarded entity is owned through a foreign partnership.
• Use the local-currency functional currency unless the QBU passes the dollar approximate separate transactions method test.

Source: Official Form 8858 information at IRS.gov