FATCA GIIN: What it is, how to register, and how to verify your number in 2026
A FATCA GIIN is a 19-character alphanumeric identifier issued by the IRS to foreign financial institutions that agree to report US account holder information under the Foreign Account Tax Compliance Act.
- A GIIN is assigned only to institutions; individual US expats do not receive one
- Every registered foreign financial institution appears on the IRS FATCA FFI List, updated monthly
- Registration is completed online through the IRS FATCA Registration System using Form 8957
All figures in this article reflect tax year 2025, filed during the 2026 filing season.
What is a FATCA GIIN?
FATCA GIIN stands for Global Intermediary Identification Number – a unique 19-character code the IRS assigns to every foreign financial institution that registers under the Foreign Account Tax Compliance Act.
The GIIN identifies the institution on FATCA reports, withholding certificates, and the publicly searchable IRS FFI List.
FATCA requires FFIs worldwide to identify US account holders and report their account information to the IRS.
An FFI that registers and receives a GIIN is classified as a participating FFI or registered deemed-compliant FFI, depending on the type of agreement it enters into. An FFI that does not register is classified as a non-participating FFI and faces a 30% withholding tax on certain US-source payments under IRC §1471(a).
If you are a US expat, you do not apply for or receive a GIIN. It is an institutional identifier – your foreign bank or investment fund holds one.
What matters to you is whether your bank has a valid GIIN. That determines how your account information is reported to the IRS.
If you are not sure how that reporting works, our guide to FATCA CRS reporting requirements covers what foreign institutions send and what it means for you.
What does GIIN stand for in FATCA?
GIIN stands for Global Intermediary Identification Number.
By definition, a GIIN in FATCA is the unique code the IRS uses to identify every registered foreign financial institution in its FATCA FFI list.
The name breaks down as follows:
- Global – the system covers financial institutions worldwide, not just in specific countries
- Intermediary – FFIs act as intermediaries between their account holders and the IRS reporting system
- Identification Number – a structured 19-character alphanumeric code, unique to each registered entity
A GIIN is assigned only to institutions – not to individuals.
If you are a US citizen or green card holder, your tax identifier is your Social Security number – SSN – or Individual Taxpayer Identification Number – ITIN.
Your foreign bank’s GIIN is its own identifier within the FATCA system.
Many expats first encounter the term when they receive a FATCA letter from a foreign bank asking them to certify their US tax status.
FATCA GIIN format – How the 19-character code is structured
The format follows a strict 19-character structure, encoding four distinct data components separated by three periods: XXXXXX.XXXXX.XX.XXX.
The four components of a FATCA GIIN are:
| Position | Component | Length | Description |
|---|---|---|---|
| 1–6 | FATCA ID | 6 alphanumeric | The registering entity’s own FATCA ID (for a lead, single, or sponsoring entity); for a member FI, branch, or sponsored entity, the first six characters of the associated lead FI’s, branch’s, or sponsoring entity’s FATCA ID |
| 8–12 | Financial institution type code | 5 alphanumeric | Identifies the type of entity – lead FI, member FI, branch, etc. |
| 14–15 | Category code | 2 alpha | Classifies the entity’s FATCA role: LE (lead FI), SL (single FI), ME (member FI), BR (FI branch), SP (sponsoring entity), SF (sponsored fund), SD (sponsored direct reporting NFFE), SS (sponsored subsidiary), or SB (sponsored subsidiary’s branch) |
| 17–19 | Country/jurisdiction code | 3 numeric | ISO 3166-1 numeric code for the country where the institution is located |
Periods appear at positions 7, 13, and 16 as separators. These characters will never contain the letter “O” – only the digit zero is used, per the FATCA Registration and FFI List GIIN Composition Information page on IRS.gov.
A GIIN is distinct from a Tax Identification Number, which identifies individual taxpayers rather than institutions.
Who needs a FATCA GIIN number?
Any foreign financial institution that chooses to participate in FATCA – rather than face a 30% withholding tax on US-source payments – must register with the IRS and obtain a GIIN. The number is assigned to institutions, not individuals.
The following entity types are required to obtain a GIIN:
- Participating FFIs – banks, custodial institutions, and depository institutions that have entered into an FFI agreement with the IRS to report US account holder information
- Registered deemed-compliant FFIs – institutions that qualify for deemed-compliant status under FATCA regulations, including local FFIs, nonreporting members of participating FFI groups, and qualified collective investment vehicles
- Sponsoring entities – entities that register on behalf of sponsored FFIs or sponsored investment entities
- Certain non-US investment funds – including investment entities in participating jurisdictions that have reporting obligations
Individual US expats do not obtain a GIIN. It is an institutional identifier. Your foreign bank holds one – you do not.
If you are a US citizen or green card holder, your filing obligations under FATCA relate to Form 8938 and the FBAR – FinCEN Form 114 – not to GIIN registration.
How is a FATCA GIIN used by foreign financial institutions?
The IRS assigns each FATCA GIIN once registration is approved, and the institution uses it across every FATCA-related process.
Foreign financial institutions use their GIIN on every FATCA-related document – from IRS information reports to W-8BEN-E withholding certificates – to confirm their compliant status to US withholding agents.
The four primary uses of a FATCA GIIN are:
- Identifying the FFI on FATCA reports sent to the IRS. Every annual report an FFI files under FATCA includes its GIIN as the primary institutional identifier.
- Appearing on withholding certificates. When an FFI provides a Form W-8BEN-E to a US withholding agent, the GIIN appears in Part I as proof of the institution’s FATCA status.
- Enabling counterparty due diligence. Other financial institutions verify a GIIN against the IRS FFI List before entering into transactions or establishing correspondent accounts.
- Confirming participating status on the IRS FFI List. A valid GIIN on the published list is the only public confirmation that an institution is actively compliant under FATCA.
If your bank faces FATCA issues, you may feel the effects too – our guide to FATCA penalties for non-compliance covers what is at stake for both institutions and account holders.
How to apply for a FATCA GIIN – step-by-step registration
Registering for a FATCA GIIN is done entirely online through the IRS FATCA Registration System, using the information collected on Form 8957.
The IRS does not publish a fixed timeline, but institutions that submit a complete application generally receive their GIIN within weeks.
- Access the IRS FATCA Registration System online. Go to the IRS FATCA Registration portal and enter the information collected on Form 8957. Registration is completed through the IRS FATCA Registration System. The IRS strongly discourages paper filing, and the stand-alone Form 8957 PDF has been withdrawn from IRS.gov.
- Create an account and designate a responsible officer. The responsible officer is the individual with authority to legally bind the institution. This person manages the registration and receives correspondence from the IRS.
- Complete the Form 8957 information within the portal. Enter the institution’s legal name, country of incorporation, and contact details. Provide the information that Form 8957 collects – entity classification, intermediary status, and FATCA agreement type.
- Select the appropriate FFI category and Chapter 4 status. Choose whether the institution is a participating FFI, registered deemed-compliant FFI, sponsoring entity, or another category. The Chapter 4 status determines the institution’s reporting obligations.
- Submit the registration and await IRS review. The IRS reviews the application for completeness. If additional information is needed, the responsible officer is contacted through the portal.
- Receive the GIIN once approved and confirm appearance on the FFI List. Once approved, the institution’s GIIN appears on the IRS FATCA FFI List, updated on the first day of each month. Confirm the listing to verify active registration.
FATCA GIIN verification – how to check the IRS GIIN list
Verification against the IRS FFI List is the only reliable way to confirm that a foreign financial institution is actively registered and compliant under FATCA.
The IRS publishes and updates its FATCA FFI list monthly, so verifying a GIIN against the current FATCA GIIN list is the standard for confirming an institution’s status.
To verify a GIIN using the IRS FATCA GIIN lookup tool, follow these four steps:
- Navigate to the IRS FATCA FFI List Search tool. The IRS FFI List Search and Download Tool is publicly accessible – no login is required.
- Enter the institution name or GIIN. You can search by the full 19-character GIIN, partial GIIN, or institution name.
- Confirm the institution appears as a participating or registered deemed-compliant FFI. The listing shows the institution’s GIIN, name, country, and FFI type. Verify that the status matches what the institution has represented.
- Note the effective date of registration. The effective date confirms when the institution’s GIIN became active. An institution that does not appear on the current list may not be compliant.
The IRS FATCA GIIN list – what it is and how to use it
The list is updated on the first day of each month and is the definitive public record of every foreign financial institution that has registered and received a GIIN.
The official name is the FATCA FFI List, and it is maintained by the IRS as a publicly available database.
Five key facts about the IRS FATCA GIIN search and download tool:
- The list is compiled fresh each month, so there’s no fixed headcount to cite – search the tool directly to confirm whether a specific institution is currently registered.
- Each entry includes the institution’s GIIN, legal name, country/jurisdiction, and FFI type
- The list is downloadable in CSV and XML formats for bulk verification
- Prior months’ lists are archived and available for historical reference
- The list is the only authoritative source for confirming an FFI’s FATCA registration status
To use the list, go to the IRS FFI List Search and Download Tool. You can search by institution name, GIIN, or country.
For bulk verification, download the full CSV file and search locally.
GIIN vs TIN – key differences every expat should know
A GIIN identifies a foreign financial institution under FATCA, while a TIN – Taxpayer Identification Number – identifies an individual or entity for general US tax purposes.
They serve entirely different functions and are never interchangeable. The GIIN code under FATCA identifies institutions; a TIN identifies taxpayers.
| GIIN | TIN | |
|---|---|---|
| Purpose | Identifies a foreign financial institution registered under FATCA | Identifies an individual or entity for US tax purposes |
| Who holds it | Foreign financial institutions – banks, investment funds, custodial institutions | Individuals via SSN or ITIN, and entities via EIN |
| Format | 19-character alphanumeric code: XXXXXX.XXXXX.XX.XXX | SSN: 9 digits, XXX-XX-XXXX; EIN: 9 digits, XX-XXXXXXX; ITIN: 9 digits, 9XX-XX-XXXX |
| Where used | FATCA reports, W-8BEN-E, IRS FFI List | Tax returns, W-2s, 1099s, W-9, and most IRS filings |
US expats have a TIN – typically a Social Security number – but never a GIIN. Your GIIN belongs to your bank or fund.
If a foreign bank asks you to provide a GIIN, they are likely confusing it with your SSN or ITIN, which they may need for FATCA reporting purposes.
Non-US spouses and dependents who need to file but cannot get an SSN use an ITIN instead.
An ITIN is a different individual identifier that has nothing to do with a GIIN.
Sponsoring entities and sponsored FFIs – special GIIN rules
A sponsoring entity must obtain its own GIIN and then register each sponsored FFI separately, resulting in distinct GIINs for the sponsor and every entity it manages. This structure is common for investment funds, closely held investment vehicles, and fund administrators.
The sponsoring entity model works as follows:
- A sponsoring entity registers with the IRS on behalf of one or more sponsored investment entities or sponsored closely held investment vehicles
- Each sponsored FFI receives its own individual GIIN, carrying a category code that identifies its sponsored status – SF for a sponsored fund, SD for a sponsored direct reporting NFFE, SS for a sponsored subsidiary, or SB for a sponsored subsidiary’s branch. The first six characters of that GIIN repeat the sponsoring entity’s FATCA ID, which is what ties the sponsored entity back to its sponsor
- The sponsoring entity assumes FATCA compliance obligations for the sponsored entities, including due diligence and reporting
- Sponsored FFIs appear on the IRS FFI List under their own GIIN, alongside the sponsoring entity’s separate listing
Consequences of a foreign bank not having a GIIN
If your foreign bank lacks a GIIN and is classified as a non-participating FFI, US withholding agents are required to withhold 30% of US-source payments.
This can directly affect returns on US investments held through that bank. The 30% withholding rate is set by FATCA statute under IRC §1471(a).
The three main consequences of a bank not having a GIIN are:
- 30% FATCA withholding on withholdable payments. US withholding agents must apply 30% withholding on US-source interest, dividends, and certain other payments made to a non-participating FFI.
- Loss of correspondent banking relationships. Other financial institutions may refuse to maintain correspondent accounts with a non-participating FFI, limiting the bank’s ability to process US dollar transactions.
- Increased scrutiny for account holders. If your foreign bank is non-participating, you may face additional compliance burdens. Other institutions that hold accounts in your name may apply FATCA withholding to payments routed through the non-participating bank.
The withholding rate applies to withholdable payments as defined under FATCA – not to all transactions with the bank. If your bank does not appear on the IRS FFI List, ask the bank directly about its FATCA status before assuming it is non-compliant.
How FATCA GIIN affects US expats with foreign bank accounts
While US expats do not personally obtain a GIIN, the GIIN status of their foreign bank directly affects how their account information is reported to the IRS.
Based on a common TFX client scenario, a US expat whose foreign bank holds a valid GIIN can expect that bank to report their account balance and income directly to the IRS – making accurate US tax filing essential.
The four practical implications for US expats are:
- Your bank reports your account information to the IRS. A FATCA-compliant bank with a valid GIIN reports US account holders’ names, addresses, TINs, account balances, and income annually – either directly to the IRS or through the bank’s local tax authority under an intergovernmental agreement.
- The IRS already knows about your foreign accounts. Run a FATCA GIIN check on your foreign bank using the IRS FFI List. If the bank has a valid GIIN, the IRS likely has your account data. Your US tax return should reflect this.
- FBAR and Form 8938 obligations remain separate. Even though your bank reports under FATCA, you still have independent obligations to file an FBAR – FinCEN Form 114 – if aggregate foreign account balances exceed $10,000 (2025) at any time during the year. Form 8938 applies if your accounts exceed the applicable reporting thresholds – our FATCA CRS reporting guide has the exact dollar amounts by filing status and residence.
- Non-compliant banks create risk for you. If your bank does not have a GIIN, it may not be reporting your information – but that does not exempt you from filing. If the IRS later discovers unreported accounts, penalties apply to the account holder, not the bank.
FATCA GIIN and Form W-8BEN-E – what account holders need to know
Foreign financial institutions provide their GIIN on Form W-8BEN-E when certifying their FATCA status to US withholding agents.
Individual US expats do not complete Form W-8BEN-E – that form is for entities. If you are a US citizen or green card holder, your foreign bank requests FATCA documentation from you.
Three key points about the GIIN and W-8BEN-E:
- Form W-8BEN-E is for entities, not individuals. The GIIN appears in Part I of Form W-8BEN-E, where the FFI certifies its Chapter 4 status. Individual US persons complete Form W-9 instead – if you are not sure which forms you need, our expat tax form checklist sorts it out by filing situation.
- Account holders may be asked to provide a W-8BEN or W-9. Your foreign bank may ask you to complete a W-8BEN – the individual version, for non-US persons – or a W-9 for US persons as part of the bank’s FATCA due diligence. A US citizen or green card holder should provide a W-9.
- A valid GIIN on the bank’s W-8BEN-E is proof of compliance. When a foreign bank provides a Form W-8BEN-E to a US counterparty, it certifies its participating FFI status and exempts itself from FATCA withholding on US-source payments.
FATCA GIIN and intergovernmental agreements – how IGAs interact with GIIN registration
Even in IGA partner countries, foreign financial institutions must still register with the IRS and obtain a GIIN. An IGA changes the reporting channel, not the registration requirement.
The three key points about IGAs and GIIN registration are:
- Model 1 IGA countries. FFIs in Model 1 IGA countries report US account holder information to their local tax authority – such as HMRC in the UK or the ATO in Australia – which then transmits the data to the IRS. The FFI still must register with the IRS and obtain a GIIN to be recognized as compliant. Transitional relief for Model 1 IGA FFIs ended on January 1, 2015 (IRS – FATCA governments)
- Model 2 IGA countries. FFIs in Model 2 IGA countries report directly to the IRS, similar to participating FFIs without an IGA. These institutions must also register and obtain a GIIN.
- The IGA changes the reporting channel, not the registration requirement. Whether your bank is in a Model 1 or Model 2 IGA country, it still appears on the IRS FFI List with its own GIIN. The difference is only in how the reported information reaches the IRS – through a local tax authority or directly. The January 1, 2015 deadline for Model 1 IGA FFIs to provide a GIIN to withholding agents has passed, and no further transitional relief has been extended.
Maintaining and updating a FATCA GIIN registration
Registration requires ongoing maintenance – it is not a one-time event. Registered FFIs must keep their registration current, renew certifications, update responsible officer information, and respond to IRS inquiries to remain on the FFI List.
The four ongoing obligations for GIIN holders are:
- Keep registration information current. FFIs must update their registration through the IRS FATCA Registration System whenever key information changes – including legal name, address, responsible officer, or Chapter 4 status.
- Renew certifications on time. Registered FFIs must submit periodic certifications to the IRS confirming ongoing compliance with their FATCA obligations.
- Update the responsible officer if they leave. If the responsible officer who registered the institution departs, a replacement must be designated promptly. The responsible officer is the IRS’s point of contact for all FATCA correspondence.
- Respond to IRS inquiries. The IRS may request additional information or documentation. Failure to respond can result in the FFI being removed from the FFI List and losing its GIIN.
FATCA GIIN for US expats – common questions from TFX clients
TFX clients frequently ask how their foreign bank’s GIIN affects them personally. Based on common TFX client scenarios:
“My foreign bank is asking for my SSN for FATCA purposes.”
This is standard. When a foreign bank has a valid GIIN, it is fulfilling its FATCA obligation to identify and report US account holders to the IRS. Providing your Social Security number is part of this process. A foreign bank requesting your SSN is not unusual – it is complying with FATCA.
“My foreign bank says it needs my SSN for a ‘GIIN report.’”
Some banks use imprecise language. The bank needs your SSN or TIN for its FATCA report, which it files using its own GIIN. You do not have or need a GIIN yourself.
“I invest in a foreign fund that claims it does not have a GIIN.”
If the fund is a non-participating FFI, US withholding agents must apply 30% FATCA withholding on certain US-source payments to the fund. This can reduce your investment returns. Verify the fund’s status on the IRS FFI List.
“I received a FATCA letter from my bank.”
Your bank is conducting FATCA due diligence to determine whether you are a US person for reporting purposes. Respond with the requested information – typically a completed W-9 and your SSN. Failure to respond may result in the bank closing your account or restricting services.
FATCA GIIN vs FBAR – understanding the difference
FATCA GIIN registration is an obligation for foreign financial institutions, while FBAR is a reporting obligation for individual US persons – they operate at different levels of the same system but serve entirely different purposes.
| FATCA GIIN | FBAR – FinCEN Form 114 | |
|---|---|---|
| What it is | A 19-character identifier issued to foreign financial institutions that register under FATCA | A report filed by US persons disclosing foreign financial accounts |
| Who files/registers | Foreign financial institutions – banks, funds, custodial institutions | US citizens, green card holders, and resident aliens |
| Purpose | Identifies the institution on FATCA reports and the IRS FFI List | Reports foreign account balances to FinCEN when the aggregate exceeds $10,000 (2025) at any time during the year |
US expats may have FBAR obligations regardless of whether their bank has a GIIN.
The FBAR threshold is $10,000 (2025) in aggregate foreign account balances at any point during the year.
You file the FBAR on FinCEN Form 114 separately from your tax return, with a deadline of April 15 and an automatic extension to October 15.
If your foreign bank has a valid GIIN, the bank is already reporting your account information to the IRS through FATCA.
Your FBAR filing is a separate obligation – one does not substitute for the other, and determining whether you must file an FBAR depends on your account balances, not on your bank’s FATCA status.
Frequently asked questions
A FATCA GIIN is the Global Intermediary Identification Number – a 19-character alphanumeric code the IRS assigns to foreign financial institutions that register under the Foreign Account Tax Compliance Act. It is an institutional identifier, not an individual one.
Go to the IRS FATCA FFI List Search and Download Tool. Enter the institution’s name or GIIN to confirm its registration status. The list is updated on the first day of each month.
No. A GIIN is assigned to foreign financial institutions, not individuals. US expats have a TIN – SSN or ITIN – for their own tax filings and may have separate FBAR and Form 8938 obligations.
The FATCA GIIN number format is a 19-character alphanumeric code: XXXXXX.XXXXX.XX.XXX. It contains four data components – FATCA ID, financial institution type code, category code, and country/jurisdiction code – separated by three periods.
The IRS does not publish a fixed timeline. Institutions that submit a complete application through the IRS FATCA Registration System generally receive their GIIN within weeks of approval.
If your bank does not appear on the IRS FFI List, it may be classified as a non-participating FFI. US withholding agents are required to withhold 30% on certain US-source payments made to non-participating FFIs under IRC §1471.
No. A GIIN in FATCA identifies a foreign financial institution. A TIN – whether SSN, ITIN, or EIN – identifies an individual or entity for general US tax purposes. They serve entirely different functions and are never interchangeable.
The IRS updates the FATCA FFI List on the first day of each month. Prior months’ lists are available for historical reference on the IRS website. The list is downloadable in CSV and XML formats.
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