Questione giuridica chiave
Whether the Zurich and Aargau assessments constituted prohibited double taxation.
Decisione estratta
No. The same person was not taxed twice on the same tax object; Zurich taxed Teyber personally, while Aargau taxed the firm Teyber und Münz, and no proof showed that the Zurich assets were contributed to that firm.
Motivazione estratta
Double taxation exists only if the same person is subjected by two cantons to the same tax on the same property object. That identity was missing here, and the alleged capital contribution was unproven.