This report on Taxing Electronic Commerce was presented at the symposium on multi-jurisdictional taxation of electronic commerce at Harvard University on April 5, 1997. This report describes the normative principles shared by most serious analyses of the problems raised by state taxation of electronic commerce. It then attempts to translate these principles into legal rules that could provide a model for uniform legislation in this area. Finally it addresses constitutional questions that will likely be encountered in any effort to implement such legislation.