Form 8966: The FATCA Report Filed by Financial Institutions
Published November 7, 2026
Form 8966 is the FATCA report. FATCA is the Foreign Account Tax Compliance Act, and its reporting rules are in chapter 4 of the Internal Revenue Code. The form reports certain U.S. accounts and certain U.S. owners of foreign entities to the IRS. Its filers are mostly financial institutions and certain withholding agents.
The Instructions for Form 8966 (2025) explain the rules. This post is general information. It does not tell you how to file your own return.
What the form reports
Form 8966 reports certain U.S. accounts. It also reports substantial U.S. owners of passive foreign entities that are not financial institutions. In some cases it reports specified U.S. persons who own certain equity or debt interests in a foreign financial institution.
A separate Form 8966 is filed for each substantial U.S. owner and each specified U.S. person. A separate form is also filed for each group of accounts that can be reported as a pool.
Who must file
The instructions list filers by their role. The list includes a participating foreign financial institution, a U.S. branch of a foreign institution, a qualified intermediary, and a sponsoring entity. It also includes certain withholding agents and trustees of some trusts.
A withholding agent that is not a foreign financial institution may have to report. This applies when it makes a payment to a passive foreign entity that has a substantial U.S. owner. The list does not name individual taxpayers as filers.
When to file
Form 8966 is due on or before March 31 of the year after the calendar year it covers. If the due date falls on a weekend or a legal holiday, the due date is the next business day.
An automatic 90-day extension is available. The filer requests it on Form 8809-I, as soon as it knows an extension is needed, and no later than the due date. Under certain hardship conditions, the IRS may grant a second 90-day extension. That request is made on another Form 8809-I before the first extended due date ends.
Model 2 institutions
Some institutions report under an intergovernmental agreement that follows a Model 2 structure. The instructions say a Reporting Model 2 institution submits Form 8966 in the same way as a participating foreign financial institution. It follows the same filing dates, unless the agreement sets a different date. A Reporting Model 2 institution cannot get an extension for a non-consenting U.S. account.
Electronic filing
A financial institution must file Form 8966 electronically, no matter how many forms it files. Other filers are strongly encouraged to file electronically. A waiver request uses Form 8508-I, filed at least 45 days before the due date.
If a filer required to file electronically does not do so, and has no approved waiver, penalties under sections 6721 through 6724 may apply.
Why this matters to you
Form 8966 is a form that institutions file. You do not file it as an individual. If you hold an account at a financial institution, the institution may report that account under these rules. Individuals with foreign accounts have their own reporting rules on other forms. See FBAR (FinCEN Form 114): The Basics for Foreign Accounts and Form 8938: Reporting Foreign Financial Assets to the IRS.
Checklist
- Know that Form 8966 is filed by institutions and certain withholding agents, not by most individuals.
- If you are a payer or institution, check your role on the filer list.
- Note the March 31 due date and the next-business-day rule.
- If you need more time, file Form 8809-I before the due date.
- Check the electronic filing rule before the first filing.
This is general information only. It is not tax advice for your situation.
Sources: Sources: IRS, Instructions for Form 8966 (2025) (https://www.irs.gov/pub/irs-pdf/i8966.pdf) This is general information, not advice about your specific return.
