The financial sustainability of microfinance institutions (MFIs) is crucial for the continual existence of the microfinance industry. As a result, emphasis has been placed on the financial sustainability of MFIs over the past few years. However, with the primary goal of the industry being the attainment of social outreach, the emphasis on financial sustainability has raised concerns about a potential adverse effect on outreach. Usingdata on 1595 MFIs in 109 countries, we examine if there is a trade-off between financial sustainability and outreach. The evidence shows that there is a trade-off between sustainability and outreach depth, but complementarity between sustainability and outreach breadth.