What are Social Impact Bonds? In 2010, the British government launched an innovative funding scheme, which it called Social Impact Bonds, where private sector investors committed funding upfront to pay for improved social outcomes that result in public sector savings. The investors were repaid by the government only when the outcomes were determined to have been achieved. This funding scheme has attracted substantial attention in the U.S. where it and many variations are being piloted, as noted in a report by the Government Accountability Office. Like performance- based contracts, social impact bonds tie payments to a provider’s performance in delivering outcomes. However, social impact bonds tie payments to meeting pre-determined performance goals. Payments are not made until results are achieved. This creates substantial risks for providers, but had attracted bipartisan political attention, and the attention of various non-profits, universities, and foundations.