Since more than 100 legal systems have committed to exchange information within the IRS, exchanges between legal systems are generally based on the multilateral convention on mutual tax assistance (convention), in which more than 100 jurisdictions participate, and the Multilateral Competent Authority`s (CRS MCAA) IRS Convention (CRS MCAA), which is based on Article 6. Legal systems can be based on a bilateral agreement, such as a double taxation agreement or an agreement on the exchange of tax information. In addition, some IRS exchanges will be organised on the basis of the relevant EU directive, agreements between the EU and third countries and bilateral agreements such as the agreements between the UK and the CDOT. This means that each jurisdiction can negotiate and define its own accounts to declare in its agreement. [Citation required] Since October 2014[update], 51 countries have signed the Multilateral Competent Authority Agreement (MCAA) to automatically exchange information on the basis of Article 6 of the Convention on Mutual Tax Assistance.  In July 2015[update], 53 countries signed the automatic exchange of information;  As of July 2016[update], 83 jurisdictions had signed the agreement.  The MCAA CRS specifies the information exchanged and when. It is a multilateral framework agreement. A specific bilateral relationship under the MCAA CRS only comes into force when the two jurisdictions have implemented the convention, submitted the necessary notifications in accordance with Section 7 and presented themselves to each other.
Their goal is to combat tax evasion. The idea was based on the implementation agreements of the US Foreign Account Tax Compliance Act (FATCA), whose legal basis is the Convention on Mutual Tax Assistance. 97 countries have signed an implementation agreement and others intend to sign it at a later date. The first notifications took place in 2017, many of the others from 2018. The new system should automatically and systematically transmit all relevant information. The agreement has been informally referred to as GATCA (the global version of FATCA), but “CRS is not just an extension of FATCA.”  In August 2020, more than 2,500 bilateral exchange relations were activated for jurisdictions that commit to exchange CBC reports, and the first automatic exchange of CBC reports took place in June 2018.