Abstract: A customs union refers in general terms to a political structure established by two or more states apparently not only to create a free trade platform but also to establish a common trade policy towards third countries, including the creation of common trade barriers. While progress has been made so far, significant aspects of these modules remains to be done. There has been problem of non-uniform customs tariffs existing within the E.A member states slowing down faster integration. The main purpose of the research study was to establish the institutional factors affecting implementation of customs integration in East