Key legal question
Whether the Zurich and Aargau assessments constituted prohibited double taxation.
Extracted holding
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.
Extracted reasoning
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.