This joint ODI-UNDP paper looks at whether development aid will remain important in the post-2015 era, and asks how the old aid model should change in response to a dramatically new world and new sustainable development challenges. The paper suggests that the label “international public finance for sustainable development” – or IPF4SD – is a more accurate description of the types of interventions that need to be funded in the post-2015 era. This finance will also be needed over the long-term. The authors suggest ways in which these funds could reliably be raised over the long-term, as well as how the architecture which mediates IPF4SD could be improved.