Introduction

Although the legal definition of income from economic activities is unique, it is the one included in article 27.1 of the Law of PIT, it is necessary to differentiate within them those derived from the exercise of business and professional activities and, within the first (business activities), those of a commercial and non-commercial nature.

The importance of these distinctions lies in the different tax treatment of each type of income, in aspects as significant as the subjection to withholding or payment on account, the accounting and registration obligations of the holders of said activities and the separate declaration of the same.

However, the declaration model of the PITIn response to the needs of taxpayers with economic activities and social partners, the Spanish Tax Agency (Taxpayer Registry) has adopted, since fiscal year 2021, a unique and common codification or nomenclature of types of activities for the main tax figures. This is intended to harmonize and standardize the codes used to record data and facilitate the flow of information. This is essential for optimizing the management of the various taxes affecting them, their proper coordination with the tax censuses and registries required to fulfill their tax obligations, and, ultimately, improving assistance to this group in exercising their rights and fulfilling their obligations.

For this reason, since the 2021 financial year, they have been included in the completion of the tax return. PIT new codes and types of economic activities, with the aim of gradually extending it to other tax returns. See in this regard the types and keys of economic activities in it PIT which are discussed in the corresponding section of this Chapter.