Automatic Exchange of Information (AEOI)

(This page deals with UK’s HMRC’s implementation of Common Reporting Standard (CRS), Crown Dependencies and Overseas Territories (CDOT) and United States Foreign Account Tax Compliance Act (FATCA) which it refers to as Automatic Exchange of Information (AEOI).  For more information on CRS relevant to all other countries in the OECD, please visit the CRS page, or for the IRS’s FATCA, please visit the FATCA page.)

Automatic Exchange of Information agreements are made between the UK and other countries. These agreements allow the exchange of information between tax authorities of different countries about financial accounts and investments to help stop tax evasion.

Financial institutions, for example, banks, building societies, insurance companies, investment companies, will provide information on non-UK residents with financial accounts and investments in the UK to HM Revenue & Customs (HMRC). HMRC will share this information with the relevant countries and will receive information from other countries about UK residents with financial accounts and investments overseas.


The UK has Automatic Exchange of Information agreements under 4 regimes.

  1. United States Foreign Account Tax Compliance Act (FATCA) – The agreement between the UK and USA requires UK financial institutions to report to HMRC on US customers that hold accounts with them.
  2. Crown Dependencies and Overseas Territories – The agreement between the UK and its Crown Dependencies and UK Overseas Territories to report on those who are tax residents in one territory and hold accounts in the other.
  3. Common Reporting Standard – The standard for all automatic exchange of financial information.
  4. Directive on Administrative Co-operation – The Directive which applies the Common Reporting Standards throughout the European Union.
AEOI Schema Entry Form in XML Authority


The information to be reported for each account is as follows:

  • Name;
  • Address;
  • Date of birth (where already held);
  • Place of birth (where already held);
  • Tax identification number (where applicable);
  • Account number;
  • The name and identifying number of the account provider; and
  • your account balance (or value) including interest and dividends, at the end of the calendar year (or other appropriate period)


AEOI seeks to establish a global methodology for the sharing amongst tax authorities of relevant information in relation to financial assets and can currently be used to describe similar but separate reporting obligations:

  • Foreign Account Tax Compliance Act (FATCA)
  • Crown Dependencies & Overseas Territories Agreements (CDOT known as UK FATCA)
  • Common Reporting Standard (CRS)

The AEOI Service (previously HMRC FATCA Portal) allows Financial Institutions (FIs) to report to HMRC on interests held by US Specified Persons under FATCA and overseas residents under CDOT agreements and CRS.

The UK schema allows the collection of FATCA, CDOT and CRS data in a single report. HMRC will sort and aggregate this data into the correct formats and submit annual returns to the relevant jurisdictions.

AEOI XML Schema in XML Authority's Schema Library
Presentation of AEOI XML Schema in XML Authority


XML Authority’s intuitive user interface makes producing valid AEOI XML filings easy with little or no training. The user guide provided by HMRC can be difficult to interpret.  Using XML Authority’s simple presentation of the schema as a set of forms and tables, a detailed understanding of the data requirements can be gained at a glance.


Reports can be further simplified by eliminating non-relevant sections using the Schema Masking functionality. Easly hide non-mandatory elements (individual reporting elements or entire report sections) which not only simplifies the schema layout but also reduces the complexity of your required import data.

Masking of CbC Schema
Integrate to Data in Excel or Relational Database


Save time and reduce errors by importing data from XML Authority generated Microsoft Excel import templates or linking to data in relational databases. Create a set of related tables from which to read data which conform to the AEOI Reporting XML schema using database scripts generated by XML Authority itself.


Be assured that your data is in compliance with the requirements of the schema through XML Authority’s validation functionality. Get real-time feedback on the validity of data input and use the interactive Validations panel to help find and navigate to issues which would cause rejection at HMRC’s submission gateway.

CbC Validation