The IISH employs 85 staff members and has a three-headed management board. In addition, a number of fellows and volunteers are associated with the Institute. The IISH is one of twelve institutes of the Royal Netherlands Academy of Arts and Sciences (KNAW), which is financed by the Dutch Ministry of Education, Culture and Sciences. The collections housed at the IISH are either owned by or on loan to an independent foundation, Stichting IISG. In 2016, the IISH joined forces with the Huygens Institute and the Meertens Institute to form the KNAW Humanities Cluster (KNAW HuC).