Important notice
This page is purely informational and does not constitute tax advice. Whether the deduction actually applies depends on current legislation, your personal tax situation and proper handling of the energy efficiency certificates. Always consult a qualified tax adviser or the Spanish tax agency (Agencia Tributaria).
Which deductions may apply?
Royal Decree-Law 19/2021 introduced three IRPF deductions for energy efficiency improvements in residential property. Depending on your case, a photovoltaic installation may fit one of them — particularly when it reduces non-renewable primary energy demand or heating/cooling consumption.
Key requirement: energy certificate before AND after
The most important — and most commonly missed — requirement is having two energy efficiency certificates: one before installation showing the initial state of the property, and one after installation proving the required improvement. Without the prior certificate, the deduction usually cannot be applied even if the system is technically perfect.
Other typical requirements
The property must be your habitual residence (or rented as such). Payments must be made via traceable bank transfer — never cash. Invoices must be in the name of the person claiming the deduction. The work must be completed within the timeframe set by current law.
Compatible with other aid?
Generally, amounts already covered by subsidies (e.g. NextGen EU funds) cannot also count toward the deduction base — only the part you actually paid out of pocket. Municipal bonuses (IBI, ICIO) are compatible because they apply to different taxes.
Recommended steps before installing
1. Request the prior energy certificate from a qualified technician. 2. Confirm with your tax adviser which deduction may apply to your case. 3. Keep all invoices and bank receipts. 4. Get the post-installation energy certificate when the work is finished. 5. Apply the deduction in your IRPF return for the relevant year.