1. Spain and the United Kingdom in respect of Gibraltar shall establish the forms of cooperation necessary to achieve full transparency in tax matters and in respect of the protection of financial interests of all the parties concerned, in particular by establishing an enhanced system of administrative cooperation to fight against fraud, smuggling and money laundering, and to resolve tax residence conflicts.

2. The international standards of the Group of Twenty (G20) and of the Organisation for Economic Co-operation and Development (OECD) relating to good fiscal governance, transparency, exchanges of information and harmful tax practices and in particular the economic substance criteria established by the OECD Forum on Harmful Tax Practices shall be complied with in Gibraltar, with a view to Gibraltar's participation in the OECD Inclusive Framework on base erosion and profit shifting (BEPS).

3. The United Kingdom shall ensure that its ratification of the Framework Convention on Tobacco Control, adopted in Geneva on 21 May 2003, and the Protocol to Eliminate Illicit Trade in Tobacco Products, adopted in Seoul on 12 November 2012, is extended to Gibraltar by 30 June 2020.

Without prejudice to the first subparagraph, the United Kingdom shall ensure that a system of traceability and security measures relating to tobacco products that is equivalent to the requirements and standards of Union law is in force in Gibraltar by 30 June 2020. That system shall ensure reciprocal access to the information on traceability of cigarettes in Spain and Gibraltar.

4. In order to prevent and deter the smuggling of products subject to excise duties or special taxes, the United Kingdom shall ensure that, in respect of alcohol and petrol, a tax system which aims at preventing fraudulent activities involving those products is in force in Gibraltar.