@fbelle , whereas I have not seen this particular scenario ( i.e. the effects of change of immigration status from no-immigrant to immigrant affecting taxability of a contracting "govt/public source " distribution. ). However, my general sense from most of the treaties and OECD model treaty , all public source payments are taxable ONLY to the distributing country and over-riding the savings clause.
However, I need to go back and refresh/re-study the US-Switzerland Tax Treaty / Technical explanations etc. before I take a firm position. Will come back prob. in a day.
pk
