Key legal question
Whether the costs of a photovoltaic system qualify as deductible energy-saving measures under cantonal and federal tax law.
Extracted holding
The costs were not deductible because the installation was made on a new building, not on an existing one.
Extracted reasoning
Energy-saving and environmental measures are treated like maintenance costs only for existing buildings. For new constructions, such expenses are non-deductible production costs. The court accepted the 5-year line used to distinguish new from existing buildings as appropriate.