How the DGT's position has evolved
Current position
Homeowners in buildings with predominantly residential use may deduct 60% of the amounts paid for energy rehabilitation works. To do so, a reduction in non-renewable primary energy consumption of at least 30% must be proven, or an improvement in the energy rating to class 'A' or 'B' via an energy certificate. The maximum annual base is 5,000 euros and the cumulative base is 15,000 euros.
The DGT's position remains constant in the application of the requirements of the 50th additional provision of the LIRPF (Personal Income Tax Law). Consultations focus on specifying the validity of energy certificates and the management of the maximum base limits. No changes in the substance of the criterion are observed, but rather clarifications regarding the accreditation of the improvement.
Turning points
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Clarifies that the certificate issued after previous works serves to accredit the initial situation of new interventions and that certificates prior to the works are valid if they are less than two years old.
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Establishes that the installation of batteries requires new certificates that accredit the specific improvement, as the certificate obtained after the installation of solar panels is not sufficient.
Analysis based on 54 of 61 rulings with a stated position. Updated 16 September 2026.