Updated October 16, 2026. Quick answer: Form 8858 is the Information Return of U.S. Persons With Respect to Foreign Disregarded Entities (FDEs) and Foreign Branches (FBs). The instructions sort filers into six categories, tell most filers to attach the form to their own return by that return’s due date, and add Schedule M when the entity had transactions with the filer or related parties. Each FDE or FB gets its own form.
S corporation return (Form 1120-S) for 2025, read line by line: Form 1120-S Schedule B questions 4 and 5 and Form 1120-S Schedule K lines 14 to 16.
Partnership return (Form 1065) for 2025, read line by line: Form 1065 Schedule B questions 1 to 3, Form 1065 Schedule L and Form 1065 Schedule M-2.
What Form 8858 is
The form’s title is “Information Return of U.S. Persons With Respect to Foreign Disregarded Entities (FDEs) and Foreign Branches (FBs)”. The instructions state its purpose this way: “Form 8858 is used by certain U.S. persons that operate an FB or own an FDE directly or, in certain circumstances, indirectly or constructively.”
Two definitions drive everything else. “An FDE is an entity that is not created or organized in the United States and that is disregarded as an entity separate from its owner for U.S. income tax purposes under Regulations sections 301.7701-2 and 301.7701-3.” “For purposes of filing a Form 8858, an FB also includes a qualified business unit (QBU) (as defined in Regulations section 1.989(a)-1(b)(2)(ii)) that is foreign.” How an entity chooses its classification in the first place is covered on the Form 8832 page.
Who must file: the six categories
The instructions open with a general statement of who files and then list categories. “Complete a separate Form 8858 and all applicable schedules for each FDE or FB.” The categories are printed as follows.
| Category | As printed in the instructions |
|---|---|
| Category 1 | “A U.S. person that is directly a tax owner of an FDE or operates an FB at any time during the U.S. person’s tax year or annual accounting period.” |
| Category 2 | “A U.S. person that indirectly through one or more tiers of FDEs is either a tax owner of an FDE or operates an FB at any time during the U.S. person’s tax year or annual accounting period.” |
| Category 3 | “Certain U.S. persons that are required to file Form 5471 with respect to a CFC that is a tax owner of an FDE or operates an FB at any time during the CFC’s annual accounting period.” |
| Category 4 | “Certain U.S. persons that are required to file Form 8865 with respect to a CFP that is a tax owner of an FDE or operates an FB at any time during the CFP’s annual accounting period.” |
| Category 5 | “A U.S. person that is a partner in a partnership that owns an FDE or operates an FB and applies section 987 to the activities of the FDE or FB using a method that requires the partner, rather than the partnership, to recognize section 987 gain or loss with respect to the FDE or FB.” |
| Category 6 | “A U.S. corporation (other than a RIC, a REIT , or an S corporation) that is a partner in a partnership, which checked box 11 (Dual Consolidated Loss) on Schedules K-2 and K-3 (Form 1065).” |
The word tax owner appears in several of those rows. “The tax owner of the FDE is the person that is treated as owning the assets and liabilities of the FDE for purposes of U.S. income tax law.” Categories 3 and 4 tie Form 8858 to two related returns, Form 5471 and Form 8865, which are covered on the Form 5471 page and in the Form 8865 explainer.
Tiers, exceptions and who completes what
Entities can be stacked, and the instructions deal with that directly: “If there are tiers of FDEs or FBs (for example, one FDE owns one or more FDEs or FBs), then complete separate Forms 8858 for each FDE or FB.”
For people who file the related Form 5471 or Form 8865 there is an exception for the same information filed by more than one person, which the instructions label as multiple filers of the same information. A person who hands the work to someone else keeps some exposure: “Any person required to file Form 8858 and Schedule M (Form 8858) who agrees to have another person file the form and schedules for them may be subject to the above penalties if the other person does not file a correct and proper form and schedule.”
When and where Form 8858 is filed
“Form 8858 is due when your income tax return or information return is due, including extensions.” The attachment rule depends on who owns the entity. “If you are the tax owner of the FDE or operate an FB, attach Form 8858 and the separate Schedule M (Form 8858), if required, to your income tax return or information return.”
A filer who is not the tax owner attaches the form to a related return: “If you are not the tax owner of the FDE or indirect FB, attach Form 8858 to any Form 5471 or Form 8865 you are filing with respect to the CFC or the CFP that is the tax owner of the FDE or operates the FB.”
Key lines on page 1
The first page identifies the entity and its owners. Lines 1j, 3e and 4d carry the functional currency. “Enter the entity’s threeletter functional currency code.” The instructions add a rule for high-inflation currencies: “An entity that would otherwise be required to use a hyperinflationary currency as its functional currency must use the U.S. dollar as its functional currency and figure income or loss or earnings and profits using the U.S. dollar approximate separate transactions method of accounting (DASTM) under the special rules of Regulations section 1.985-3. However, if the hyperinflationary QBU is an FDE or FB of a foreign corporation with a non-U.S. dollar functional currency that is not hyperinflationary, the functional currency of the FDE or FB is the functional currency of the foreign corporation and such QBU applies Regulations section 1.985-3 by substituting the functional currency of the foreign corporation for the U.S. dollar.”
Line 5 requires a chart. “You must attach an organizational chart that includes the following information with respect to the chain of ownership between the tax owner and the FDE or FB”. “Each filer of Form 8858 that is required to file an organizational chart with respect to more than one FDE and/or FB may satisfy this requirement by filing a single organizational chart that includes the required information with respect to all FDEs and FBs.”
The first-year and last-year boxes are not interchangeable. “Only one of these boxes can be checked on each Form 8858 filed.”
Schedules C, F and M, and exchange rates
The financial schedules are summaries prepared under U.S. accounting rules, and Schedule M captures dealings between the entity and related parties.
| Schedule | As printed in the instructions |
|---|---|
| Schedule C | “Use Schedule C to report a summary income statement for the FDE or FB figured in the FDE’s or FB’s functional currency in accordance with U.S. generally accepted accounting principles (GAAP).” |
| Schedule F | “Use Schedule F to report a summary balance sheet for the FDE or FB figured and translated into U.S. dollars in accordance with U.S. GAAP.” |
| Schedule M | “A Schedule M (Form 8858) must be filed with each Form 8858 if the FDE or FB entered into any transaction with the filer of the Form 8858 or other related entities during the annual accounting period of the FDE or FB.” |
Schedule M asks for the largest balance, not the ending balance, on loans. “Report on lines 20 and 21 the largest outstanding balances during the year of gross amounts borrowed from, and gross amounts loaned to, the related parties described in columns (b) through (f).” “Do not enter aggregate cash flows, yearend loan balances, average balances, or net balances.”
Exchange rates have a reporting convention of their own. “the exchange rate must be reported as the units of foreign currency that equal 1 U.S. dollar, rounded to at least four places.”
The penalties
The penalty rules sit in the instructions under their own heading. The first row below is the failure to furnish the information, and the additional penalty starts when a notice has gone unanswered. “If the information is not filed within 90 days after the IRS has mailed a notice of the failure to the U.S. person, an additional $10,000 penalty (per CFC or CFP) is charged for each 30day period, or fraction thereof, during which the failure continues after the 90day period has expired.”
| Item | As printed in the instructions |
|---|---|
| First penalty | “A $10,000 penalty is imposed for each annual accounting period of each CFC or CFP for failure to furnish the required information within the time prescribed.” |
| Cap on the additional penalty | “The additional penalty is limited to a maximum of $50,000 for each failure.” |
| Foreign tax credit reduction | “Any person who fails to file or report all of the information required within the time prescribed will be subject to a reduction of 10% of the foreign taxes available for credit under sections 901 and 960.” |
| Criminal penalties | “Criminal penalties under sections 7203, 7206, and 7207 may apply for failure to file the information required by section 6038.” |
A worked illustration follows the printed formula. If the first $10,000 penalty applies and then 2 thirty-day periods pass after the 90-day period, the computed amount of the additional penalty is $10,000 times 2 periods, which makes $20,000 of additional penalty. The computed amount with the first penalty is $30,000. This is a computed illustration, not an IRS example.
Key numbers at a glance
The figures that matter most are collected here, each as printed.
| Item | As printed |
|---|---|
| First penalty | “A $10,000 penalty is imposed for each annual accounting period of each CFC or CFP for failure to furnish the required information within the time prescribed.” |
| Maximum additional penalty | “The additional penalty is limited to a maximum of $50,000 for each failure.” |
| Foreign tax credit reduction | “If the failure continues 90 days or more after the date the IRS mails notice of the failure to the U.S. person, an additional 5% reduction is made for each 3-month period, or fraction thereof, during which the failure continues after the 90-day period has expired.” |
| Organizational chart (line 5) | “You must attach an organizational chart that includes the following information with respect to the chain of ownership between the tax owner and the FDE or FB” |
Which revision applies
The edition read for this page is Form 8858 (Rev. December 2024) and the Instructions for Form 8858 (Rev. December 2024), which are the revisions irs.gov served when they were read on 2026-10-16. Check the revision printed on the form you are filing, because a later revision can change the categories of filers, the schedules and the penalty wording.
The instructions name the paired schedule edition: “Use with the December 2024 revision of Form 8858 and the September 2021 revision of separate Schedule M”.
Common mistakes
- Filing one Form 8858 for a structure with several entities. The instructions say to complete separate Forms 8858 for each FDE or FB, including each tier.
- Leaving Schedule M off when the entity dealt with the filer. The instructions require a Schedule M with each Form 8858 if the FDE or FB entered into any transaction with the filer or other related entities during the annual accounting period.
- Reporting loan balances at year end. The instructions say not to enter yearend loan balances, average balances or net balances on lines 20 and 21, but the largest outstanding balances during the year.
Related: Form 8832 entity classification, Form 5471 foreign corporations, Form 1116 foreign tax credit, how to get an EIN, and do you need an LLC.
Sources
- Form 8858 (Rev. December 2024), Information Return of U.S. Persons With Respect to Foreign Disregarded Entities (FDEs) and Foreign Branches (FBs): https://www.irs.gov/pub/irs-pdf/f8858.pdf
- Instructions for Form 8858 (Rev. December 2024): https://www.irs.gov/pub/irs-pdf/i8858.pdf
Read from the IRS documents linked above on October 16, 2026. General information, not tax advice. Your own facts decide the outcome, and a preparer, the account provider or the IRS is the right place to confirm anything consequential.