If you are a citizen of one of the following countries, you must apply to the EU Settlement Scheme:
Austria, Belgium, Bulgaria, Croatia, Republic of Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain and Sweden.
Irish citizens may apply to the EU Settlement Scheme, but it is not essential.
UK citizens do not need to apply to the EU Settlement Scheme.
If you are a citizen of one of the above countries, but have been granted indefinite leave to remain, you do not need to apply to the EU Settlement Scheme.