Questão jurídica principal
Whether the taxpayer was entitled to a prior decision on tax sovereignty in Zurich
Decisão extraída
A prior decision is generally required when tax sovereignty is disputed, but no such decision was effectively issued here.
Fundamentação extraída
The letters relied on by the taxpayer were not dispositive decisions; they were merely statements in an inter-cantonal exchange, and the city tax office lacked competence to issue such a decision.