This paper argues that an effective climate change strategy for a country, corporation, or facility requires a detailed understanding of GHG emissions sources, quantities, and trends over time. National inventories and corporate/facility inventories each fulfill unique roles and corporate/ facility reporting programs can provide localized information on the most significant emissions sources and emissions trends. It argues that governments interested in developing (or enhancing) a national inventory system and corporate/facility reporting program should seek to capitalize on possible linkages between the two systems. The paper identifies two potential areas for linkages: (1) integrating source data into the national system to improve completeness and accuracy; and (2) sharing institutional resources, technical expertise, and data systems to build on existing capacities and get the most from limited resources. The paper concludes that proactively identifying and exploiting these and potential other linkages can bring enhanced benefits.