How the DGT's position has evolved
Current position
Classification in the IAE (Tax Administration Index) depends on the effective nature of the activity and whether it is carried out personally or through an organization. Business activities are registered in the first section, while professional activities without an organization are registered in the second section. The existence of exclusivity contracts or the collection of fees does not alter the obligation to register under the headings that correspond to the actual economic activity.
There is no doctrinal evolution regarding a single concept, but rather a series of dispersed criteria that apply classification rules according to the specific case. The DGT maintains the application of the rule regarding the nature of the activity and the distinction between business and professional activity. The position is consistent in the application of the IAE Tariffs to determine the appropriate heading.
Turning points
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Establishes that in the absence of a specific heading, Rule 8 of the Instruction must be applied to find the heading that is similar by nature.
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Defines the technical distinction for classification: if the activity is carried out directly and personally it is professional, but if it is carried out within an organization it is business-related.
Analysis based on 41 of 42 rulings with a stated position. Updated 15 September 2026.