When people hear “FBAR,” they usually think about owning foreign bank accounts. But ownership (also referred to as having a “Financial Interest” in a foreign bank) of a foreign bank account is only part of the picture.
The FBAR rules also apply to people who don’t own the money at all, but still have the power to control what happens to it. That’s where signature authority comes in.
At a baseline, signature authority means you can control the movement of money in an account, either on your own or together with someone else, by directly communicating with the financial institution. If you can initiate payments, transfers, or withdrawals (even if the money isn’t yours) that account may need to be reported on your FBAR.
Understanding signature authority and evaluating the foreign bank accounts that you’re affiliated with accordingly is one of the most important (and overlooked) tax season to-do items for US expats and business owners abroad.
Why the FBAR Cares About Signature Authority
FBAR reporting is not limited to people with foreign wealth. It’s designed to capture visibility and control over foreign financial accounts.
That’s why the FBAR filing requirement applies to US persons who have either:
- A financial interest in a foreign account, or
- Signature authority over a foreign account
The logic is simple: if you can move money in or out of an account, the government wants that account disclosed, even if you’re acting on behalf of a business, a partnership, or an employer.
This is why people are often surprised to learn they have FBAR obligations even when their personal finances are entirely US-based.
Signature Authority vs Financial Interest
One of the biggest sources of confusion is mixing up financial interest and signature authority. They sound similar, but they mean very different things for FBAR purposes.
Financial interest is about ownership. You have a financial interest if you own an account directly, benefit from it indirectly, or own enough of an entity that owns the account. This includes personal accounts, jointly held accounts, and many business structures.
Signature authority, on the other hand, is about access and control, not ownership. You may have signature authority even if you have no claim to the money in the account and never receive distributions from it.
This distinction matters because it explains why:
- Employees can have FBAR exposure without personal wealth abroad
- Business partners may need to report company accounts
- Officers or directors can have obligations tied to accounts they don’t own
If you can tell the bank to move money, the Financial Crimes and Enforcement Network (FinCEN) responsible for enforcing FBAR rules may care, even if the money isn’t yours.
When Signature Authority Triggers FBAR Reporting
The trigger for FBAR filing is easier to remember than most people expect.
The Basic FBAR Threshold Still Applies
Signature authority does not create a separate threshold. The standard FBAR rule still applies:
If the aggregate value of all foreign financial accounts over which you have financial interest or signature authority exceeds $10,000 at any point during the year, an FBAR filing may be required.
This means you don’t look at accounts one by one. You look at the total across all relevant accounts.
You Don’t Need to Be the Account Owner
This is the key point many people miss.
You can trigger FBAR filing solely because of signature authority—even if:
- The account belongs to a company
- The funds are not yours
- You never transfer money for personal use
Ownership is not required for FBAR exposure. A custodial account, like those you may open on behalf of a minor child or a dependent, older family member, is a classic example of textbook signature authority.
Related: Explore our Family Office Tax Services
Common “US Business Owner Abroad” Scenarios
This is where signature authority most often shows up in real life.
You’re a Signatory on Your Foreign Operating Account
You move abroad and open a local business bank account, perhaps in Spain, France, Italy, or Portugal. Your name is on the account, so you can pay vendors, run payroll, or manage expenses.
Even if the company is foreign-owned or jointly owned, being a signatory alone can create FBAR obligations once the threshold is crossed. This feels natural because if you are the 100% owner, then you may assume that you have a financial interest in the company account. But it can get more complicated.
Partnership or Multi-Founder Setups
In small or mid-sized companies, it’s common for multiple founders to have signing authority. Two partners may both be able to initiate payments, approve transfers, or access online banking.
From an FBAR perspective, each person with signature authority may have reporting obligations, regardless of how ownership is split. (Note that this only applies to people attached to the US tax system; non-U.S. people with signature authority on a foreign bank account are not required to file an FBAR.)
This often surprises founders who assume only the person who manages the bank account is responsible.
You Gave Your Accountant, CFO, or Operations Manager Bank Access
Giving someone else access to an account does not remove your own FBAR responsibilities.
In some cases, it may create obligations for them as well, depending on whether their access rises to the level of signature authority. The fact that someone else can move money does not negate the fact that you still can.
This is one of the reasons FBAR compliance can get complicated quickly in growing businesses. Also, if your accountant or operations manager is not familiar with these rules, you should let them know!
“Authorized Signer” vs “Signature Authority” (Why Search Results Are Confusing)
Many people search for “authorized signer” and “signature authority” interchangeably, an understandable conflation given how similar these terms objectively seem.
Authorized Signer Is a Banking Concept
An authorized signer is someone the bank recognizes as having permission to transact on an account. This is a standard banking term and often appears on account agreements.
For FBAR purposes, what matters is whether that authorization allows you to:
- Control the disposition of funds
- Communicate directly with the bank to initiate transactions
If the authorized signer role includes those powers, it may meet the FBAR definition of signature authority, regardless of what the bank calls it.
In other words, bank terminology doesn’t override FBAR rules. The IRS and FinCEN look at what you can do, not what your role is called. When in doubt, report the account on your FBAR.
What Accounts Count for Signature Authority FBAR Questions?
FBAR signature authority applies to foreign financial accounts, including:
- Bank accounts
- Securities or brokerage accounts
- Other financial accounts held outside the US
The key factor is the location of the account, not the currency used or the nationality of the institution.
Pro tip: A common misconception is that USD Wise accounts are not reportable on FBAR – this is not necessarily true. If you opened a USD Wise account from abroad, there’s a good chance the bank is domiciled outside of the US. If it doesn’t have a US address, it’s reportable on an FBAR, even if it holds US currency.
Practical Guidance
Signature authority questions are often simple in theory but can feel frustratingly complicated in practice, especially for globally-mobile US business owners.
If You’re Not Sure, Ask Yourself These three Questions
- Can I move money out of the account or direct payments?
- Can I do this alone, or jointly with someone else?
- Can I instruct the bank directly (online access generally counts in practice)?
If the answer to these questions is “yes,” signature authority is likely in play.
Why This Gets Complicated Fast for Expats
The longer you’re abroad, the more challenging it can be to keep track of your accounts, especially if you’re a business owner. Foreign accounts can quickly stack if you need to consider:
- Multiple countries
- Personal and business accounts
- Multiple entities
- Multiple people with signing power
When in doubt, we recommend including the account on the report, which, at a baseline, is simply an informational administrative document.
Related: Check out our business tax services for expat business owners.
Final Thought: Signature Authority Is a Planning Issue, Not Just a Filing Detail
Signature authority is easy to overlook because it often shows up as a side effect of growth: new entities, new partners, new accounts in new countries. But for US expats and business owners abroad, it’s also a signal that your tax footprint is expanding and your compliance strategy needs to keep pace.
If you’re managing foreign accounts, operating a business abroad, or stepping into more complex financial roles, this is a good moment to step back and look at the bigger picture. A proactive US tax planning and compliance strategy helps ensure that growth abroad doesn’t create avoidable friction (or expensive cleanup work) later.
👉 You can request a consultation with Rook to review your US tax planning and compliance strategy and make sure your international expansion stays smooth and well-supported.
