Doctrine by topic · DGT Observatory

Ancillary Activities: DGT doctrinal evolution

How the DGT's position on this topic has evolved, and the rulings it rests on.

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How the DGT's position has evolved

Stable position High confidence 12 rulings · 2014–2023

Current position

Ancillary activities are defined by their necessary link to the main activity in order to share its tax treatment. In the IAE (Economic Activities Tax), classification depends on whether the work is complementary to a project or if it is performed in isolation. In the scope of IVA (Value Added Tax), support, management, or advertising services are not considered exempt ancillary activities if they do not constitute the taxable event of the main activity.

The DGT maintains a consistent stance in which the nature of the ancillary activity determines its taxation. There is no doctrinal evolution, but rather an application of specific criteria depending on the tax (IVA, IAE, or IRPF [Personal Income Tax]) and the sector analyzed. The position remains stable by distinguishing between support services (taxable) and necessary complementary services (exempt or integrated).

Analysis based on 11 of 12 rulings with a stated position. Updated 27 September 2026.

Rulings on this topic

12

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