The Platform for Collaboration on Tax (PCT) is a joint initiative of the International Monetary Fund (IMF), the Organisation for Economic Co-operation and Development (OECD), the United Nations (UN), and the World Bank Group (WBG) to strengthen collaboration on domestic resource mobilization (DRM). 

The PCT is supported by the governments of Japan, Luxembourg, the Netherlands, Norway, Switzerland, and the United Kingdom. In their different capacities, the four PCT members support country efforts through policy dialogue, technical assistance and capacity building, knowledge creation and dissemination, and input into the design and implementation of standards for international tax matters. One key initiative has been developing the concept of the Medium-Term Revenue Strategy, a means of coordinating support for country-led tax reform. 

The PCT Secretariat (currently hosted by the World Bank Group) steers the work and maintains the Online Integrated Platform which highlights contributions provided by PCT partners, such as research and toolkits for use by policymakers and administers. The Secretariat also manages the Multi Donor Trust Fund (MDTF).