Solar installation property-tax reduction
IBI property-tax relief for taxpayers who voluntarily install solar energy for self-consumption in an existing residential property in Alcorcón.
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The reduction lowers your annual Impuesto sobre Bienes Inmuebles (IBI), the municipal property tax. It is 50% of the gross tax charge, capped at €300 each year, for at most the five tax years following completion of the installation. Across all years, the relief cannot exceed 95% of the installation’s material execution cost after subtracting public subsidies received for it. For shared installations, this cost limit applies to the amount allocated to each owner.
You must request the reduction; it is not retroactive. Applying later does not restart the five-year period.
Eligibility
- You must be the IBI taxpayer for an urban residential property in Alcorcón. New construction is excluded. You must have voluntarily installed the property’s first solar thermal or photovoltaic system for self-consumption; installations required by law, installations included in a new-building project, and expansions or replacements of existing systems do not qualify.
- The system must provide at least 50% of the total energy supply. Photovoltaic capacity must be at least 2 kWp per dwelling. For shared self-consumption in multi-storey buildings under the condominium ownership regime, and homes participating in self-consumption energy communities, the minimum is 1.5 kW per dwelling. Solar thermal collectors must have the competent authority’s approval and a municipal licence.
- A system serving only common areas without their own separate cadastral reference does not qualify.
- You must be up to date with municipal tax obligations when the reduced tax falls due, on 1 January. Notify the Ayuntamiento de Alcorcón of changes affecting the reduction.
How to apply
- Status
- Öppet löpande
- Villkor för ansökningsomgången
- File before 1 January of the requested effective tax year and before the five-year period following installation completion expires.[^c2]
Use the Ayuntamiento de Alcorcón’s solar IBI application form, currently listed among its in-person forms. Submit it in duplicate through the municipal filing route at Plaza Reyes de España, 1, Alcorcón; the portal publishes Monday–Friday hours of 08:30–14:00 and telephone +34 91 664 81 00.
Include the municipal standard-form declaration of compliance, a copy of the installation licence, electrical installation bulletin, installation photograph, itemised invoice and proof of payment, and your DNI. Each dwelling receiving the energy needs an individual certificate issued by the Comunidad de Madrid’s Dirección General de Industria or an industrial inspection and control entity. A representative must provide identification and proof of authority.
For a condominium installation, the owners’ association president may apply for all participants if they authorise this. Include the participating owners and the costs allocated to each, together with any additional documentation the municipality requires.
You can file while the five-year benefit period remains available, but must submit before 1 January of the tax year in which the reduction should take effect. For an eligible installation completed in 2026, filing before 1 January 2027 requests relief beginning in 2027; the five-year period runs from 2027 to 2031 under the current rules.