In new and challenging markets, blendedconcessional finance - the combining of concessional fundswith other types of finance, on commercial terms - isincreasingly used to mobilize capital and accelerate highimpact private sector investments. However, a relatively newapproach for the provision of concessional capital for useby development finance institutions is emerging - thereturnable capital model. With this new model, principal,interest, and other amounts are repaid to the originalprovider of funds (usually a government) on a regular basis.Because this can reduce the impact on donor governmentbudgets, more government funds can become available forcollaboration with the private sector. This note exploresthe effects of this new model on incentives, accounting,resource management, and reporting.