If you are a US citizen or green-card holder living abroad, checking your mail and finding a formal, multi-page letter from your local bank asking for your Social Security Number (SSN) or Taxpayer Identification Number (TIN) is a deeply unsettling experience.
For many expats, this letter is the first time they realize that their US tax obligations did not stop when they moved overseas.
The content, deadline, and legal form of these requests vary by institution and jurisdiction. A request may ask the customer to certify tax residence, provide a US taxpayer identification number, or complete an IRS or institution-specific form.
If US returns or FBARs may be missing, the bank request and the US filing history should be analyzed as separate issues. A bank letter does not itself determine US tax liability or eligibility for a filing procedure.
What is a FATCA Letter and Why Did You Get It?
The letter you received is a direct result of the Foreign Account Tax Compliance Act (FATCA), a federal law passed by the US Congress in 2010.
FATCA generally requires participating foreign financial institutions to identify accounts carrying US indicia and report certain specified US accounts. Entity, account and jurisdictional exceptions apply. Depending on the intergovernmental agreement, reporting may be made directly to the IRS or through a local tax authority. US indicia can trigger a request for documentation rather than conclusively establish that an account is reportable.
FATCA can impose 30% withholding on certain US-source payments made to a nonparticipating foreign financial institution. That is a withholding regime, not a 30% penalty on every US financial transaction. Participating institutions and institutions operating under intergovernmental agreements have different due-diligence and reporting rules.
A FATCA letter generally reflects the institution's due-diligence process. Its precise duties depend on the applicable regulations, agreement, local law, and account classification.
Which Form Is the Bank Actually Asking For?
FATCA letters usually enclose one of three things:
- A self-certification form: the bank's own questionnaire (sometimes combined with CRS certification) where you declare your countries of tax residency and, if you are a US person, your SSN or TIN.
- Form W-9: the IRS form for US persons. US citizens, green-card holders, and US tax residents complete this one, regardless of where in the world they live.
- Form W-8BEN: the certification for non-US persons only.
Do not file a W-8BEN just because you live abroad. A US citizen living in London or Tokyo is still a US person for tax purposes. Certifying non-US status on a W-8BEN when you are a US citizen is a false certification signed under penalty of perjury, and it creates a far worse problem than the reporting it was meant to avoid.
How Long Do You Have to Respond?
Deadlines vary by bank and country. The operative date is the one in the institution's request. Two practical points:
- Ask about the institution's extension policy. FATCA does not create a universal customer extension right. Any extension depends on the institution and applicable law.
- Do not assume silence prevents reporting. An undocumented account can remain subject to due-diligence, reporting, restriction, or closure rules.
What Happens If You Ignore the Letter?
Possible responses include reminders, restrictions, closure, and reporting. The sequence and reporting category depend on the institution and the FATCA regime that applies.
The step-by-step escalation is covered in what happens if you ignore a FATCA letter. Already lost the account? See what to do when your bank closes your account for being American.
The Expat's Dilemma: The SSN Trap
Providing accurate documentation does not itself resolve whether returns, FBARs, or Form 8938 were complete. The bank's reporting and the taxpayer's own filing obligations are separate.
If US returns or FBARs are missing, providing a taxpayer identification number can help a financial institution associate reportable information with the taxpayer. The IRS does not publish a rule under which that act automatically creates an examination or penalty.
Depending on the governing FATCA regime and account facts, the institution may report specified information directly to the IRS or through a local tax authority. That information can reveal an inconsistency, but no primary source supports a universal automated sequence or a default FBAR assessment. For 2026, the non-willful civil FBAR statutory maximum is $16,536 per annual report, not per account, and it is not an automatic penalty.
A Possible Filing Procedure: Streamlined
The Streamlined Foreign Offshore Procedures (SFOP) are available to eligible taxpayers who meet the program's non-residency and non-willfulness requirements and are not under an IRS civil examination or IRS Criminal Investigation.
For a qualifying SFOP submission:
- The offshore penalty is 0% and specified failure-to-file, failure-to-pay, accuracy-related, information-return, and FBAR penalties are waived.
- The submission includes three years of covered returns, six years of covered FBARs, and Form 14653.
- Tax and statutory interest remain due.
The Examination and Investigation Bar
A taxpayer is ineligible for the Streamlined procedures once there is an IRS civil examination for any taxable year or an IRS Criminal Investigation, whether or not it relates to foreign assets.
A bank report does not itself make a taxpayer ineligible. An IRS civil examination or IRS Criminal Investigation does. Ineligibility for Streamlined does not make statutory maximum penalties automatic.
Issues to Review
When a FATCA request and possible US filing gaps overlap, the following issues require separate attention:
1. Do Not Submit a "Quiet Disclosure"
A quiet disclosure is the filing of amended returns and payment of tax without using an applicable voluntary-disclosure procedure. The IRS warns that it may examine such filings and determine penalties under existing law. It does not state that it routinely imposes full penalties. Streamlined eligibility must be assessed before using Form 14653.
2. Confirm Your Eligibility
For a US citizen or lawful permanent resident, SFOP requires both no US abode and at least 330 full days outside the US in at least one covered year; someone who is neither is tested on failing the substantial presence test instead, and on a joint return both spouses must meet their applicable test. Non-willfulness means conduct due to negligence, inadvertence, mistake, or a good-faith misunderstanding of the law. Recklessness and willful blindness are not non-willful. The eligibility guide summarizes other threshold requirements.
3. Work with a Specialist to Prepare Your Package
An eligible SFOP submission requires three covered years of federal returns, six covered years of FBARs, and Form 14653 signed under penalties of perjury. A taxpayer may self-prepare or seek help from a qualified professional. The appropriate professional and scope depend on the forms and any legal issue, including possible willfulness.
The timing and content of a bank response are governed by the institution's request. Submitting a US compliance package does not guarantee a particular bank outcome or an IRS determination.