This study is an update of "Documenting Climate Mainstreaming in the EU Budget" published in 2020. The methodology used by the European Commission for tracking climate change and biodiversity related expenditure at EU level is reviewed again in the light of the Multiannual Financial Framework approved in 2021 and the new regulatory framework covering the period 2021-2027. This confirms the main strengths and weaknesses pointed out by the initial study. Recommendations for improving the tracking mechanisms are updated considering the new requirements of the Interinstitutional Agreement (2020).