The outcome of COP21 urged developed countries to scale up their level of financial support, over and above their initial finance pledges, with a concrete roadmap to achieve their USD 100 billion a year commitment by 2020. This note provides analytical support to country preparation of such a roadmap, assessing the scale of future climate finance as well as identifying and discussing some key uncertainties. It sets out the resulting projections for climate finance in 2020 along with the underlying assumptions and methodologies.