The issues of ‘sustainability’, ‘transparency’, and ‘taxes’ are linked through the latest addition to the Global Reporting Initiative Standards (GRI 207: Tax 2019) for sustainability reporting. (Global Sustainability Standard Board, GRI 207: Tax 2019, 5 December 2019, https://www. globalreporting.org/standards/gri-standards-download-center/gri207-tax-2019/). The first part of this article deals with the basics of sustainability reporting using the GRI framework, its application, and the incentives for companies to extend it to tax aspects. In the second part, the individual regulatory areas of the standard GRI 207: Tax 2019 published on 5 December 2019 are analysed in detail.