Key legal question
Whether the 1996 Swiss-US double taxation convention applied to an assistance request concerning tax years 1995-1997.
Extracted holding
The request was governed by Article 26 of the 1996 convention because the assistance provisions are procedural and apply from entry into force, even if the tax periods in question predate 1998.
Extracted reasoning
Article 29 ch. 2 concerns substantive allocation of taxing power, not procedural exchange of information. Procedural rules apply immediately upon entry into force.