Banks have long provided essential services to the economy and to Canadians. In return, they have had access to special privileges, and been subject to special prohibitions. Across the world, there are boundaries around what we in Canada would call the “business of banking”. Such boundaries are important, because they set the conditions under which institutions may be recognized as “banks,” and may have access to those privileges and prohibitions. This report summarizes research undertaken across five jurisdictions – Australia, Japan, Singapore, the United Kingdom (UK), and the United States (US, federal level only) – with respect to a particular kind of boundary on the business of banking: the separation of banking business from commercial business.