OECD Companion to the Inventory of Support Measures for Fossil Fuels 2015 This publication is concerned with all policies that directly support the production or consumption of fossil fuels in OECD countries and in a selection of partner economies. It provides a useful complement to the online OECD database that identifies and estimates direct budgetary transfers and tax expenditures benefitting fossil fuels and from which it derives summary results and indicators on support to fossil fuels as well as policy recommendations. This report emphasises the problems that fossil fuel subsidies cause in the context of broader policy efforts for mitigating greenhouse gas emissions and reviews the various reform initiatives that have already been taken at the international level (G 20 APEC etc.). In addition it presents the coverage method and data sources used for constructing the online database and further discusses caveats and data interpretation.