Partnerships between international organizations serve a practical function in coordinating institutional actions and supporting mutually shared objectives. However, international law has thus far struggled to address key issues that arise in such scenarios, particularly in the allocation of legal responsibility among these actors. This contribution outlines the complex character of resource-based collaborations established by international financial institutions. The author analyzes such partnerships in light of both their constitutive legal instruments and the International Law Commission's 2011 Draft Articles on the Responsibility of International Organizations, ultimately advocating for greater synergy between these rules and the activities such relationships entail in practice.