The Social Impact Incentives (SIINC) model is a blended finance instrument introduced for the first time in 2016. In the SIINC model, enterprises are provided with time-limited premium payments for achieving social impact, thus aligning profitability with their social impact and enabling them to attract growth capital. The SIINC agreement is a bilateral contract between an outcome funder (e.g. a development agency or a philanthropic organization) and an enterprise; an independent verifier assesses the impact performance and clears payments for disbursement; the investment between the enterprise and its investor is arranged via a separate contract.