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Certificate of Sponsorship
A Certificate of Sponsorship is not paperwork. The details on it define the job you are committing to provide and the terms against which your compliance will be measured.
A CoS is assigned through the sponsor management system and enables a worker to apply. It records the role, the salary, the hours, the work location and the start and end dates. Each of those becomes a term you are expected to honour and evidence.
Errors at this stage are disproportionately expensive. Some cause a refusal, which the worker pays for in time and fee. Others pass unnoticed until a compliance visit, where the mismatch between the certificate and the reality is exactly what an officer is looking for.
Getting it right is a matter of care rather than complexity, but it requires someone who understands what each field is actually used for.
Who this is for
- Sponsors assigning a certificate for the first time
- HR teams who have inherited responsibility for the SMS
- Employers who have had a CoS-related refusal
- Organisations assigning certificates in volume
- Sponsors whose allocation is insufficient for planned recruitment
- Employers where the role or terms have changed since a CoS was assigned
What assigning a CoS involves
01
Allocation
Ensuring you hold sufficient certificates for planned recruitment, and requesting more where needed.
02
Role and terms
Recording the occupation code, duties, salary, hours and work location accurately and consistently with the contract.
03
Dates
Start and end dates set with the worker’s application timing and their longer-term position in mind.
04
Assignment
Issuing the certificate and giving the worker what they need to apply.
05
Consistency thereafter
Keeping employment aligned to the certificate, and reporting where it changes.
Common and costly errors
The wrong occupation code
The code drives eligibility and salary requirements. An inappropriate choice can cause a refusal or, worse, pass and then unravel later.
Salary stated inconsistently
Where the certificate, the contract and the payroll disagree, the discrepancy is a finding.
Work location that is not where the work happens
Hybrid and multi-site working needs recording accurately rather than conveniently.
Dates set without thought
End dates affect the worker’s permission and their route to settlement. Setting them arbitrarily creates avoidable problems.
Duties copied from an old certificate
Recycled descriptions rarely match the actual role, and are easy to disprove.
The certificate is the reference point for everything that follows.
For the next several years, your compliance in respect of that worker is measured against what the certificate says. So is the worker’s ability to change roles, be promoted or progress towards settlement.
Ten minutes of care at assignment prevents most of the problems we are later asked to fix, and some of those cannot be fixed at all.
How MichelleBelle assists
We advise on certificate assignment as a matter of routine for retained clients, and on individual assignments where the position is not straightforward.
- Advising on occupation code and role description
- Checking salary and terms against current requirements
- Advice on dates, and their effect on the worker’s longer-term position
- Reviewing a draft certificate before assignment
- Requesting additional allocation where recruitment plans require it
- Advising where terms have changed after assignment
- Training HR teams to assign certificates confidently
Common questions
Can a Certificate of Sponsorship be corrected after assignment?
It depends on the error and on whether the worker has applied. Some matters can be addressed, others cannot, and the right course depends on the specifics. Take advice before making a further assignment or contacting the Home Office.
How many certificates can we assign?
You hold an allocation, and further certificates can be requested where you can evidence the need. Employers planning significant recruitment should consider allocation early rather than at offer stage.
Does the CoS have to match the employment contract?
They should be consistent. Where they differ, you are exposed on both fronts: the certificate you assigned and the terms you actually applied.
What if the role changes after the worker starts?
Changes to duties, salary, hours or location may be reportable and may affect whether the sponsorship remains valid. Check the position before implementing the change, not afterwards.
This page is general information about sponsorship and compliance and is not advice on your organisation’s circumstances. Immigration Rules and Home Office sponsor guidance change; where a specific requirement, fee or threshold affects a decision you are taking, check the position in force at that date or ask us. Information on this page last reviewed August 2026.
Assigning a Certificate of Sponsorship and want it right first time?
Corporate enquiries are handled by the practice team. For a case-specific discussion, book a consultation.