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 mission of the PCT is to support countries’ efforts to improve revenue mobilization by leveraging the expertise and experience of the four Partner Organizations, each with their own mandate and policies. The PCT offers a platform for the Partners to collaborate in developing guidance and tools to assist countries with tax system reforms, focusing in particular on environmental taxation, international taxation, and MTRS. The PCT also enables dialogue and information exchange on revenue mobilization between the Partners and promotes broad stakeholder engagement.

The PCT is supported by the governments of France, Japan, the Netherlands, Norway, Switzerland, and the United Kingdom. In their different capacities, the four PCT partners 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. 

The PCT Secretariat (currently hosted by the World Bank Group) steers the work and maintains the Tax Projects Database, which highlights regional and country projects provided by PCT partners. The PCT website hosts knowledge products and publications for use by policymakers and administrators. The Secretariat also manages the Multi-Donor Trust Fund (MDTF).