This document presents an Urban Climate Action Impacts Framework (UCAIF or ‘the Framework’) that can be applied when exploring the wider impact of city climate action. The report functions as a user guide with common principles, taxonomy and guidelines for approaching the mapping and assessment of those wider impacts. The outputs of the work aim to catalyse medium-term development of the tools, resources and evidence cities need to make the case for climate action by linking that climate action to the other priorities they face.