This note examines how to maximize the benefits from the use of market instruments in support of developing countries' low-emission development priorities. First, it briefly surveys the current state and trends of the carbon market, highlighting the main achievements of carbon finance over its decade-long history. Second, it reviews updated scenarios of the scale of future carbon markets and associated financial flows, in light of developments in climate negotiations and domestic markets. Finally, it identifies the necessary steps to scale up carbon market flows in future, on both the demand and supply sides, including the reform of existing mechanisms, and innovation to broaden the scope, scale and reach of carbon markets. The most important determinant of carbon offset market flows to developing countries is clearly the level of international mitigation targets: the more ambitious the targets the greater the scope for such flows. Developed countries can also encourage flows by increasing supplementary limits, which are the proportion of mitigation targets that can be met by purchases from developing countries. Finally, there remains a considerable need for innovation, awareness-raising and capacity building in public and private institutions in developing countries, to increase their participation in the carbon market and build and enabling environment for low-emission development.