The application deadline for those who were living in the UK by the end of the transition period at 23:00 GMT on 31 December 2020, is 30 June 2021.
Even if you have permanent residence document in the UK, you still need to apply to the EUSS to stay in the UK after June 2021.
The EU Settlement Scheme (EUSS) applies to EU, EEA and Swiss citizens even if they have been in the UK for many years, and even if they have been married to a British spouse for a long time.
If you moved to the UK before 1 January 1973, you may have been given Indefinite Leave to Remain automatically if you are an EU, EEA or Swiss citizen. If you were, you do not need to apply to the EUSS to stay in the UK but can if you want to.
Irish citizens do not need to apply to the EUSS, but their family members who are not British or Irish need to apply.
Find out more on the Government website.