Germany implemented supplementary regulations for the Freedom of Movement Law especially for British citizens duly registered as residents in Germany before 1 January 2021. These British citizens and their family members who had the right of free movement before Brexit will remain their current rights within Germany, in line with the withdrawal agreement. This applies in particular to those pursuing gainful employment. However, they have to declare their residency to the immigration office by 30 June 2021 at the latest. The immigration office will issue a document called “Aufenthaltsdokument-GB” as proof of their legal status.
British citizens moving to Germany after 1 January 2021 will be treated like any other non EU-citizen. They will need a residence permit in order to live and work in Germany.