How the DGT's position has evolved
Current position
Owners of dwellings in buildings of predominantly residential use may deduct 60% of the amounts paid for works that improve the energy efficiency of the building. It is required to certify, through an energy efficiency certificate, a reduction in non-renewable primary energy consumption of at least 30% or an improvement in the rating to class 'A' or 'B'. The deduction is applied in the tax period in which the certificate is issued following the works. The limits are 5,000 euros annually and a maximum of 15,000 euros.
The DGT's position remains constant regarding the substantive requirements of the deduction, such as the required savings percentages or energy ratings. The evolution focuses on the precision of the formal requirements, such as the obligation for certificates to comply with Royal Decree 390/2021 and the corresponding registration. Likewise, the timing of the application of the deduction linked to the issuance of the certificate has been clarified.
Turning points
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Establishes that energy efficiency certificates must be issued and registered according to Royal Decree 390/2021 to certify compliance with the requirements.
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Specifies that the deduction must be practiced specifically in the tax period in which the energy efficiency certificate is issued following the completion of the works.
Analysis based on 32 of 35 rulings with a stated position. Updated 23 September 2026.