The European Parliament has approved new EU rules establishing a single methodology for calculating greenhouse gas emissions from transport services under the CountEmissionsEU Regulation, following confirmation by EU governments in February 2026, to improve the comparability of environmental performance across transport modes and reduce the risk of misleading claims. The methodology will apply on a voluntary basis, but transport operators that choose or are required to report emissions must use the common EU standard, which covers emissions from vehicle operation and energy use and prioritises primary data to enhance accuracy while encouraging direct measurement. To reduce administrative and financial burdens, particularly for small and medium-sized enterprises, the European Commission is required to develop a free, publicly available calculation tool and guidance within four years. The methodology does not currently include full life-cycle emissions; however, the Commission must assess within four years whether it can be expanded to cover additional stages such as manufacturing, maintenance and end-of-life, subject to data availability and international progress, to inform future revisions. The rules will enter into force 20 days after publication in the Official Journal of the EU and will apply, with certain exceptions, four and a half years thereafter.