How the DGT's position has evolved
Current position
The deduction for energy rehabilitation works requires proof of improvement through an energy efficiency certificate demonstrating a reduction in non-renewable primary energy consumption of at least 30% or an energy rating of A or B. The right to the deduction arises in the tax period in which the certificate is issued following the works. Being the owner of the property is an indispensable requirement to apply the benefit.
The DGT's position remains constant regarding the technical requirements for energy improvement and the timing of the generation of the right. Conditions regarding the timing of previous certificates and the necessity of the owner status have been specified. There are no changes to the essence of the criterion, only clarifications on practical application.
Turning points
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Establishes that certificates issued before the works are only valid if two years have not elapsed between their issuance and the commencement of the works.
Analysis based on 50 of 58 rulings with a stated position. Updated 27 August 2026.