This Practice Note outlines requirements for companies and limited liability partnerships (LLPs) to report on environmental impacts under the Companies Act 2006 such as through Streamlined Energy and Carbon Reporting (SECR) requirements introduced through the Companies (Directors’ Report) and Limited Liability Partnerships (Energy and Carbon Report) Regulations 2018, SI 2018/1155. This includes requirements for narrative reporting in the directors’ report including mandatory greenhouse gas (GHG) and energy use reporting by quoted companies, large unquoted companies and large LLPs. It also covers mandatory environmental reporting requirements in the strategic report, such as from the Directive on disclosure of non-financial and diversity information, or a section 172 statement, as well as requirements under the UK Corporate Governance (UKCG) Code and accounting standards. The Practice Note then focuses on environmental reporting in accordance with certain domestic regulatory reporting requirements, the US Securities Exchange Commission, pension funds and EU environmental reporting developments such as the Regulation on Sustainability-related Disclosures and disclosures under the Taxonomy Regulation. It also provides detail and guidance on the Task Force on Climate-Related Financial Disclosures (TCFD), as well as how it is being implemented in the UK across seven organisation types (listed commercial companies, UK-registered large private companies, banks and building societies, insurance companies, asset managers, life insurance and FCA-regulated pension schemes and occupational pension schemes). The note also considers environmental reporting through the UK Sustainability Disclosure Requirements (SDR) and Green Taxonomy.