How the DGT's position has evolved
Current position
For energy efficiency deductions, an energy efficiency certificate issued before the start of the works is required, with a maximum age of two years. The deduction for battery charging systems is limited to the amounts paid between the entry into force of Royal Decree-Law 5/2023 and December 31, 2024. In the case of electric vehicles, the 15% deduction requires the vehicle to be new.
The DGT's position has moved from treating the deduction for the primary residence to focusing on specific incentives for energy efficiency and sustainable mobility. Recent rulings detail strict technical requirements, such as the validity of energy certificates and the newness condition of electric vehicles. There is no evolution of a single concept, but rather a diversification of criteria for different tax incentives.
Turning points
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Establishes the impossibility of applying two deductions for the same work, conditioning the application on the specific requirements for reducing energy demand or consumption.
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Introduces the need for an energy efficiency certificate issued before the works and with a maximum age of two years.
Analysis based on 21 of 24 rulings with a stated position. Updated 24 September 2026.