Output-Based Aid (OBA) and otherresults-based financing mechanisms are gaining popularity inthe development context for many reasons, in particular, thedesire to link scarce public funding with actual results onthe ground. But withholding disbursements until the deliveryof 'results' or 'outputs' requires thatthe service providers delivering the results must haveaccess to finance (A2F) to pay for the 'inputs' inthe first place. Such finance is not always available oraffordable. The purpose of this working paper is to outlinesome of the key issues related to OBA and A2F. The analysisfocuses on the energy, water, and health sectors. Micro,small and medium enterprise (MSME) financing is the maintopic; however, OBA is ultimately about poor householdsaffording access to basic services, and many OBA schemesattempt to address A2F for households, so some of theseinnovations are also described. The working paper isexpected to support a consultative process between expertsdealing with A2F challenges and experts on OBA. This processshould help raise awareness of the OBA approach amongpotential financiers, and help consider solutions(instruments, partnerships, capacity building) so that OBAand other similar results-based financing mechanisms can bebrought to scale and integrated into broader sector policy,where appropriate.