The Frontier Worker Permit has been introduced to enable EU workers who live abroad, but who work in the UK on a regular basis, to continue to be able to do so from 1 January 2021.  The work being undertaken in the UK must be ‘genuine and effective’.
The key requirements are that an applicant must be an EU, EEA or Swiss national who is not primarily resident in the UK and is either:
a worker in the UK; or
self-employed in the UK; or
a person who has retained the status of employed or self-employed.
In order not to be primarily resident in the UK, the person should be present in the UK for less than 180 days in any 12 month period and (save in exceptional circumstances) have returned to their country of residence at least once in the past six months period or twice in the past 12 months.
Frontier workers who were employed in the UK by 31 December 2020 can continue to enter the UK using their valid EU national identity card or national passport until 30 June 2021.  From 1 July 2021, frontier workers must hold a valid Frontier Worker Permit in order to enter the UK as a frontier worker.  Frontier Worker Work Permits will be valid for a five year initial period.