Questione giuridica chiave
Whether the constitutional complaint against the Zurich objection decision and the Basel assessment was admissible, including the request for reimbursement but not interest.
Decisione estratta
The complaint was admissible against both cantonal decisions; however, a claim for interest on overpaid taxes was inadmissible in this proceeding.
Motivazione estratta
In double-taxation cases, the Federal Supreme Court may also review concurrent cantonal assessments. Interest on overpaid taxes follows cantonal law and requires exhaustion of cantonal remedies.