The regulations on the protection of personal data would enable, for the purpose of tax management, the communication of data with tax significance to the Tax Administration through a procedure to request the information, in each specific case, when it refers to a specific person or set of people, such as creating a specific mailbox to address requests. On the other hand, in the absence of a general provision establishing this, the regulations would not enable the periodic supply of information. In cases where the protection regulations enable the communication of data, it is not necessary to inform the people affected by the communication to the Tax Administration, in accordance with what is set out. With regard to communication with the aim of improving annual market forecasts and studies, and to complement the information system on the market, it will be necessary to be aware of the provisions of the additional provision of the Tax Code of Catalonia.