This paper aims to assess the economic impact of the IMF’s support through its facilities for low-income countries. It relies on two complementary econometric analyses: the first investigates the longer-term impact of IMF engagement—primarily through successive medium-term programs under the Extended Credit Facility and its predecessors (and more recently the Policy Support Instrument)—on economic growth and a range of other indicators and socioeconomic outcomes; the second focuses on the role of IMF shock-related financing—through augmentations of Extended Credit Facility arrangements and short-term and emergency financing instruments—on short-term macroeconomic performance.