CoS allocation
CoS allocation is the process by which a UK sponsor licence holder requests a batch of undefined Certificates of Sponsorship from the Home Office for in-country workers.
Certificates of Sponsorship are allocated by the Home Office in batches. There are two types of CoS: defined CoS (for workers outside the UK applying for a Skilled Worker visa from overseas — employers can assign these without a separate allocation request) and undefined CoS (for workers already in the UK switching visa routes — these require an allocation request to the Home Office before they can be assigned). For most employers hiring from overseas, defined CoS are the relevant type and do not require a separate allocation request.