Despite the large sums of money spent by states, businesses, migrants and their families annually on migration, the international community lacks a comprehensive delineation of the size and distribution of what could be dubbed ‘migration finance.’ Beyond disparate data points for specific flows, countries, regions or migration corridors, there is, as of yet, no definition of what constitutes such financing and no methodology for aggregating different migration-related financial flows to account for them as a discrete area of finance.