The EC's Communication on preparing for the end of the transition period between the EU and the UK under the UK's withdrawal agreement, which runs until the end of this year only, published by the EC on 9 July 2020, and other documents can be found here:
https://ec.europa.eu/info/european-union-and-united-kingdom-forging-new-partnership/future-partnership/getting-ready-end-transition-period_en
