On 17 September 2020, the European Commission proposed to raise the EU climate target for 2030, so as to reduce greenhouse gas emissions by 55% compared to 1990. In this policy brief, CLIMACT and Ecologic Institute unpack the Commission's impact assessment for the new target. The brief analyses key policy options and analytical results and compares them to recent studies, in particular CLIMACT's 2030 modelling results. Within the framework of the tightened target, the EU Commission proposes to extend the EU Emissions Trading Scheme to buildings and road transport – a major change to the EU's current climate policy architecture. The team discusses potential implications and provides context to the sectoral developments and policies. The briefing highlights key points where the Commission diverges from other studies, identifying climate mitigation potentials that merit more attention in future analysis.