FATCA (the Foreign Account Tax Compliance Act) is a US law that requires financial institutions worldwide to identify and report on accounts held by US persons. The Common Reporting Standard (CRS) is an OECD-developed multilateral framework under which financial institutions report on account holders who are tax resident in any of more than 100 participating jurisdictions. The two regimes share a common conceptual architecture: both require financial institutions to classify themselves, conduct due diligence on account holders, and report to their domestic tax authority. But they differ significantly in origin, geographic scope, the categories of account holder targeted, and the specific technical requirements that apply.
Origin and legal basis
FATCA was enacted by the United States Congress in 2010 as domestic US legislation with extraterritorial reach. It operates in the Cayman Islands through the Model 1 Intergovernmental Agreement (IGA) signed in November 2013, and is implemented domestically through the Tax Information Authority (International Tax Compliance) (United States of America) Regulations, 2014.
CRS is not the domestic law of any single country: it is a standard developed by the Organisation for Economic Co-operation and Development (OECD) and adopted by participating jurisdictions through their own national legislation. In the Cayman Islands, CRS is implemented through the Tax Information Authority (International Tax Compliance) (Common Reporting Standard) Regulations, 2015.
Geographic scope: bilateral vs. multilateral
FATCA is a bilateral arrangement: Cayman Islands Reporting Financial Institutions report account information relating to US persons to the Cayman Islands Tax Information Authority (TIA), and the TIA exchanges that information only with the United States Internal Revenue Service (IRS).
CRS is multilateral: the TIA exchanges information with the tax authorities of every CRS participating jurisdiction, currently over 100 countries, simultaneously. For a Cayman Islands fund with investors from many countries, CRS generates a far larger number of reportable accounts than FATCA.
Who is a reportable person?
Under FATCA, the reportable persons are US citizens, US tax residents, certain US entities, and US-owned passive NFFEs (Non-Financial Foreign Entities with Substantial US Owners holding more than 10%).
Under CRS, the reportable persons are individuals and entities that are tax resident in any CRS participating jurisdiction other than the Cayman Islands itself. A fund with investors from Germany, Japan, Australia, Singapore, and the UK must report on all of them under CRS, whereas under FATCA only US persons are reportable.
The GIIN requirement
One of the most visible practical differences between the two regimes is the Global Intermediary Identification Number (GIIN). FATCA requires Reporting Foreign Financial Institutions to register with the IRS and obtain a GIIN: a unique 19-character identifier that appears on the IRS-published FFI List and is used by US withholding agents to verify compliance.
CRS has no equivalent: there is no central global registration system analogous to the IRS GIIN regime. Under CRS, compliance is verified through the domestic framework of each participating jurisdiction, with no single published list of compliant CRS entities.
Entity classification differences
Both regimes use the concept of a Financial Institution and require entities to classify themselves, but the specific classifications differ in detail. FATCA distinguishes between Reporting FFIs, Non-Reporting FFIs (including Deemed Compliant FFIs), and NFFEs (Active and Passive). CRS distinguishes between Reporting Financial Institutions and Non-Reporting Financial Institutions, with a different set of exemptions. Importantly, the categories of entity that qualify as a Non-Reporting Financial Institution differ between FATCA Annex II and CRS Schedule 2 — an entity exempt under FATCA may still be a Reporting Financial Institution under CRS, and vice versa.
Withholding mechanism: FATCA only
FATCA imposes a 30% withholding tax on withholdable payments made to non-compliant FFIs or Passive NFFEs that fail to disclose their Substantial US Owners. Withholdable payments include US-source interest, dividends, and certain other fixed or determinable annual or periodic income.
Note that gross proceeds from the sale of US securities were removed from the definition of withholdable payments by Treasury regulations effective 2019 and are no longer subject to FATCA withholding (though they remain a reportable item in FATCA returns).
CRS has no withholding mechanism: it is a pure reporting obligation backed by domestic enforcement without any automatic withholding sanction for non-compliance.
Nil returns and compliance forms
Another important practical difference concerns nil return obligations. Under the Cayman FATCA Regulations, the filing of FATCA nil returns is non-mandatory: Reporting FFIs with no US reportable accounts may file nil returns voluntarily but are not obliged to do so.
Under Cayman CRS, nil returns are mandatory: all Reporting Financial Institutions must file a nil return for any CRS participating jurisdiction in which they hold no Reportable Accounts. CRS also imposes an additional annual filing that FATCA does not. The CRS Compliance Form, due by 15 September each year (moving to 30 June from the 2026 reporting year under CRS 2.0 amendments), requires each RFI to certify its classification, due diligence procedures, and overall compliance posture for the relevant period.
Practical implications for Cayman Islands funds
A Cayman Islands fund will typically need to comply with both FATCA and CRS independently, even though the regimes share similar underlying infrastructure. In practice, many funds use a combined due diligence process. They collect a single self-certification form from investors that captures both FATCA and CRS information and then file separate annual returns via CFARS for each regime. Despite the overlap, the two regimes cannot be treated as interchangeable: the entity classifications, reportable person definitions, and exemption categories must be analysed separately for each.
Understanding the distinction between FATCA and CRS is fundamental to structuring an effective compliance programme for a Cayman Islands fund. At wb.group, we can assist with entity classification, combined subscription document review, and annual CFARS reporting under both regimes.
Related questions: What FATCA obligations apply to a Cayman Islands fund or company? | What is the Common Reporting Standard and how does it apply to Cayman Islands funds? | What is a GIIN and does my Cayman Islands fund need to register for one?
FAQs
Yes, it is common practice for Cayman Islands funds to use a combined FATCA and CRS self-certification form that captures the investor’s US person status for FATCA purposes alongside their jurisdiction(s) of tax residence and TINs for CRS purposes. However, the form must be carefully drafted to meet the specific requirements of both regimes, and some fund managers use separate forms to reduce the risk of error.
No. FATCA and CRS are separate legal obligations that operate in parallel. CRS does not replace FATCA, and compliance with CRS does not satisfy FATCA obligations. Cayman Islands Reporting Financial Institutions must comply independently with both regimes, including separate registration, due diligence, and annual reporting requirements.
It can be. Cayman Islands funds that receive US-source withholdable payments, such as interest, dividends, or certain other fixed or determinable annual or periodic income, and fail to register as Reporting FFIs or whose GIIN does not appear on the IRS FFI List, risk having 30% withheld by the US withholding agent. Funds with no US investments are not directly exposed to this risk but should maintain their FATCA classification documentation.