This background paper to The State of Food and Agriculture 2023 describes how true cost accounting (TCA) and the lessons learned from its application can inform efforts to develop a sound economic foundation for sustainability in business and finance in agrifood systems. It looks at the current state of TCA in the business and financial sector, giving examples of different initiatives and resources available that have contributed significantly to the development of knowledge and guidance for TCA application within the private and financial sectors in agrifood systems.