The government has issued some very detailed guidance about the status of EU citizens and Benefits post Brexit.
'The Government has committed to ending free movement to the UK and introducing a new points-based immigration system. This means that there will no longer be separate arrangements for EEA citizens. Instead, there will be one new points-based immigration system...four new purposes...'
'1. to align the treatment of EEA citizens who are not protected by the EU Withdrawal Agreement, the EEA European Free Trade Association Separation Agreement and the Swiss Citizens’ Rights Agreement (“the Withdrawal Agreements”) and the UK’s implementation of those agreements, with non-EEA citizens in the immigration system from 1.1.21 (referred to throughout this memo as “newly arriving EEA citizens”) and
2. to make some savings and transitional provisions, including for those with status under the EUSS (in addition to those made by and under the Withdrawal Agreement Act 2020) and
3. to amend provisions relating to retained EU law and
4. to reflect the Act’s provisions to protect the rights of Irish citizens.'
The guidance can be accessed here-