How the DGT's position has evolved
Current position
To apply energy efficiency deductions, the taxpayer must be the owner of the dwelling. It is required to certify a 30% reduction in non-renewable primary energy consumption or to achieve an 'A' or 'B' rating through a certificate. Certificates must be issued and registered in accordance with Royal Decree 390/2021. If certificates issued prior to the start of the works are used, they cannot be more than two years old.
The DGT's position remains constant regarding the substantive requirements of consumption reduction or rating improvement. The evolution focuses on the precision of formal and ownership requirements. Requirements have been added regarding the registration of certificates according to Royal Decree 390/2021, the condition of being the owner, and the temporal validity of prior certificates.
Turning points
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Establishes the mandatory requirement that energy efficiency certificates must be issued and registered in accordance with Royal Decree 390/2021 in order to apply the deduction.
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Clarifies that the condition of being the owner of the dwelling is an indispensable requirement to access the deductions of the fiftieth additional provision of the LIRPF (Personal Income Tax Law).
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Introduces a time limit for the validity of certificates issued before the start of the works, setting it at a maximum of two years.
Analysis based on 55 of 59 rulings with a stated position. Updated 16 September 2026.