This report explores the introduction of carbon taxes with a national offset component and their interactions with other policy areas, and makes recommendations on this topic. In this task, the study focuses on the approaches Chile, Mexico and South Africa have chosen for elaborating their carbon taxes. The study identifies the objectives the three countries pursue by introducing these new systems as well as the requirements they establish for the use of offsets. Furthermore, it analyses the interaction between the use of offsets and other policy areas, in particular on co-benefits, co-costs and long-term emissions mitigation trajectories.