How the DGT's position has evolved
Current position
Owners of residential buildings may deduct 60% of the amounts paid for energy rehabilitation works. To do so, it is mandatory to certify, through an energy efficiency certificate, a reduction in non-renewable primary energy consumption of at least 30% or the attainment of an A or B energy rating. Certificates issued before the works are only valid if they were issued within a maximum period of two years before the start of said works.
The DGT's position remains constant regarding the technical requirements for the deduction, such as the 30% reduction in consumption or the A/B rating. The doctrine has specified the temporal validity of previous certificates, establishing that they cannot be more than two years old relative to the start of the works (V0547-26, V0968-26).
Turning points
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Establishes that certificates issued before the start of the works are only valid if they have been issued within a period not exceeding two years before the start date.
Analysis based on 37 of 40 rulings with a stated position. Updated 15 September 2026.