This paper discusses the development of the accounting guidance under the Paris Agreement. The recommendations in this paper draw from the approaches contained in the Greenhouse Gas Protocol Mitigation Goal Standard, developed by the World Resources Institute (WRI) through a multistakeholder process, building on existing accounting guidance under the Convention and the Kyoto Protocol. It was developed to provide further guidance on accounting for mitigation targets in the absence of more comprehensive guidance under the United Nations Framework Convention on Climate Change (UNFCCC). This paper provides recommendations for developing accounting guidance under the Paris Agreement that can be applied to the variety of mitigation components in Parties’ NDCs. It outlines key decisions to be made regarding NDC accounting and reporting of accounting-related information and provides approaches to address those issues.