Two questions trip up almost everyone filing their first FBAR: what happens with joint accounts, and what exactly is signature authority. Both hinge on the same two-part trigger in the regulations — you file if you have a financial interest in, or signature authority over, a foreign financial account, and the aggregate crosses $10,000. This page untangles both concepts with the cases people actually encounter.
Financial interest vs signature authority: the core distinction
Financial interest means the money is yours in substance: accounts in your name, accounts you own jointly, and accounts where the beneficial owner is you even if someone else's name is on the paperwork (nominee accounts, some "Ibori" structures, agent arrangements).
Signature authority means you can control the disposition of the account's money by communicating directly with the institution — typically online banking access, debit cards on business accounts, or formal signing power — regardless of whether any of it is yours.
The distinction drives three different practical consequences: who must be reported, what value goes on the form, and which deadline applies (signature-authority-only filers get the automatic extension to April 15 of the following year).
Joint accounts: the rules
Joint account between two US persons (typically spouses). Both have a financial interest; both are responsible for an FBAR existing. One FBAR can serve both: the filing spouse lists the account and identifies the other spouse as a joint owner on that account's entry. Report the full maximum value of the account, not "your half."
Joint account with a non-US person. The US person reports the entire maximum value of the account. There is no proration for the foreign co-owner's share — the regulations require the full value, with your co-owner's identity noted.
Joint account where only one spouse is a US person. The US spouse files; the non-US spouse is identified as the joint owner. The non-US spouse's own US reporting duties are nil (they may have none), but the account still counts fully toward the US spouse's aggregation test.
The trap people miss: a joint account counts once toward the $10,000 aggregation threshold, but once the threshold is crossed, every account — including each joint account — is reported at its full maximum value. See how aggregation works.
Signature authority: the cases
| Situation | FBAR duty? | Notes |
|---|---|---|
| Employee over a company's foreign operating account | Yes, if aggregate > $10,000 | Signature-authority-only; extended deadline applies |
| Adult child with access to a parent's account | Yes, if aggregate > $10,000 | Depends on whether access = control of disposition |
| Treasurer/officer of an organization with a foreign account | Yes, if aggregate > $10,000 | The organization itself may also have entity-level duties |
| Officer/employee of a financial institution over the institution's or fellow employees' accounts | No — regulatory exception | 31 CFR 1010.350 carve-out |
| Power of attorney never used to direct funds | Fact-dependent | Dormant POA with no actual control generally does not create authority |
| Online view-only access (no ability to transact) | No | Viewing is not disposition control |
Two practical notes. First, signature authority is assessed per person and per year: your authority over your employer's account aggregates with your own accounts for the threshold test, but the FBAR distinguishes each account's ownership status on the form. Second, the maximum value you report for a signature-authority-only account is the account's full maximum — you do not limit it to amounts you ever touched.
Special case: the "convenience signer"
A common real-world pattern: you were added to a company account "for convenience" years ago, never transacted, and forgot it existed. The regulation asks whether you can control disposition by communicating with the bank — not whether you do. If you still hold transacting access, the duty likely exists; if your access was long since converted to view-only or revoked, it likely does not. When in doubt, get the access formally downgraded or removed — the cleaner fact pattern is worth more than any argument later.
Coordinating filings within a family
For families abroad, the efficient pattern is: one FBAR per US person, each listing all accounts where they hold a financial interest or signature authority; joint spousal accounts flagged with the other spouse as joint owner; children's UTMA-style or custodial accounts reported by the parent with financial interest. Filing duties don't transfer to the family member with the tidier paperwork — each US person is responsible for their own form, and each is exposed to the penalty structure for their own non-filing.
This page is general information, not tax or legal advice. The signature-authority exceptions are regulatory and fact-specific; verify against 31 CFR 1010.350 and consult the IRS FBAR guide for your situation.
Frequently asked questions
Who files the FBAR for a jointly held foreign account?
Each US person who has a financial interest in the account must ensure an FBAR is filed reporting the full maximum value. For a joint account between two US persons (typically spouses), one FBAR can cover the account for both, with the other listed as a joint owner. For an account held with a non-US person, the US person reports the entire maximum value of the account.
Does my spouse and my joint account double the FBAR threshold?
No. The $10,000 test is aggregate value of all foreign accounts, not per person. A joint account with your spouse counts once toward the threshold — but if the threshold is crossed, the account (and its full value) must be reported on the FBAR.
Can both spouses be listed on one FBAR?
Yes. For a jointly owned account where both owners are US persons, one FBAR may be filed with both owners identified: the filer completes the form and lists the other spouse as a joint owner on the account entry. Each spouse remains jointly responsible for ensuring a timely FBAR exists.
What is signature authority on an FBAR?
Signature authority exists when you can control the disposition of money in a foreign account by communicating directly with the bank — even if none of the money is yours. Employee over a corporate account, adult child on a parent's account, treasurer of an organization: all can trigger signature-authority reporting duties if the aggregate threshold is met.
Do I have to report my employer's account if I have signature authority?
Generally yes, with a specific exception: employees and officers of financial institutions have a regulatory exception covering signature authority over accounts owned by the institution or by certain fellow employees (31 CFR 1010.350). Outside that carve-out, signature authority over a work account is reportable, with the extended deadline for signature-authority-only filers.