With the climate crisis intensifying in urgency, the stakeholders of global companies are clamoring for more reliable reporting regarding a company’s overall carbon footprint as well as the emissions attributed to individual products and services. In this study, I synthesize recent innovations by select firms, industry consortia, and academic studies in the field of corporate carbon accounting. These innovations pertain to the architecture of a firm’s carbon accounting system, for instance, the adoption of transactional double-entry bookkeeping that enables stock variables to be tracked separately from periodic flow variables. In addition to questions of architecture, recent contributions to the field of carbon accounting have raised a host of specific accounting issues pertaining to boundaries, allocation rules and the recognition of carbon credits. Ideally, these issues will be addressed through a set of commonly accepted carbon accounting principles, akin to Generally Accepted Accounting Principles. Wide adoption of such principles would enhance the comparability and reliability of corporate carbon reports, and thereby provide companies with stronger long-term incentives to embark on effective decarbonization pathways.