How the DGT's position has evolved
Current position
The change of use from commercial premises to residential housing is subject to AJD (Stamp Duty) based on the value of the converted properties, provided that such transformation modifies the cadastral value. The declaration of new construction is taxed on the actual cost of the work performed, excluding the rest of the building. The modification of horizontal division is also subject to AJD based solely on the part of the building that is modified.
The DGT's position remains stable regarding the requirement of valuable content for AJD, conditioning taxation on the modification of the cadastral value (V1948-14, V0075-17, V1033-21). Clarifications have been provided regarding the tax base in cases of new construction and horizontal division (V0836-24).
Turning points
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Specifies the AJD tax base, establishing that the declaration of new construction is taxed on the actual cost of the work and horizontal division only on the modified part.
Analysis based on 11 of 11 rulings with a stated position. Updated 27 September 2026.