Tax disclosure has become increasingly important for the stakeholders of public interest entities (PIEs). The heterogeneity of tax disclosure in financial and sustainability report-ing leaves open questions about the (non) integration of tax and sustainability reporting. This paper aims to explore the components of tax-related sustainability reporting (TRSR) and the derivation from existing reporting standards. Based on legitimacy and stakeholder (agency) theories, the authors stress the need for a regulation of TRSR from a European perspective and deliver an innovative reporting concept.