Key legal question
Whether the taxpayer had to bear the cantonal appeal costs because he could have produced the decisive evidence earlier.
Extracted holding
Yes. Since the taxpayer could have submitted the substantiating records during the objection stage, the cantonal court could lawfully charge him costs.
Extracted reasoning
Under Art. 144 DBG and the general evidentiary burden rules, the taxpayer had to substantiate deduction-reducing facts. He produced the decisive construction documents only in the appellate reply, although he had sufficient reason and opportunity to do so earlier. This caused or at least unnecessarily prolonged the appeal proceedings.