How to request undefined Certificates of Sponsorship with success

Employers with a sponsor licence can recruit international workers by assigning a Certificate of Sponsorship(CoS), which allows a worker to apply for a visa.

A Certificate of Sponsorship is not a physical document, but an electronic record issued through the Sponsor Management System. A defined Certificate of Sponsorship contains details of a specific role and worker. 

In some cases, employers may need to request additional undefined Certificates of Sponsorship from the Home Office. Where these requests are not clearly justified or properly evidenced, delays or refusals can impact recruitment timelines and wider business operations.

Undefined Certificates of Sponsorship are typically used for workers already in the UK who are extending their stay or switching visa routes.

Employers are normally given an annual allocation of undefined Certificates of Sponsorship. If this allocation is not sufficient, they can apply to increase it through the Sponsor Management System.

In practice, additional requests are often needed where business circumstances change. This may include retaining existing sponsored workers, responding to changes in ownership or structure or managing increased workforce demand.

Requests for additional undefined Certificates of Sponsorship are subject to scrutiny by the Home Office.

Sponsors must assign undefined Certificates of Sponsorship from their annual allocation and can request an increase through the Sponsor Management System where this is not sufficient. GOV.UK guidance also makes clear that sponsors should carefully consider how many workers they are likely to sponsor and why, as this determines their allocation and any subsequent requests for additional Certificates of Sponsorship. 

The Home Office must be satisfied that there is a genuine need for the request and that it aligns with the organisation’s size, business activity and previous sponsorship usage. Where information is unclear or inconsistent, further information may be requested or the application may be refused.

When assessing a request for an undefined Certificate of Sponsorship (CoS) allocation, the Home Office does not rely on a single checklist or requirement. Instead, they consider a range of factors together to determine whether the request is credible, proportionate, and supported by the sponsor’s operational needs. 

One of the primary considerations is whether the business genuinely requires the additional allocation at the time of the request. This includes examining why the increase is needed, how many additional certificates are being requested, whether the request aligns with the size and nature of the organisation, and whether there are genuine vacancies, upcoming hires, or visa extensions that justify the allocation. Broad or generic explanations such as “business growth” are often viewed as insufficient without supporting operational detail.

The Home Office will also assess the credibility of the sponsored roles themselves. This typically involves a review of:

• Job titles
• SOC codes
• Salaries
• Duties
• Work locations
• Reporting structures; and 
• Whether the proposed positions make commercial sense within the organisation. 

Where salaries appear disproportionate to the business size, or the organisational structure appears inconsistent or artificial, applications are likely to receive greater scrutiny. 

In addition, the sponsor’s compliance history plays an important role. The Home Office may consider whether the sponsor has previously complied with immigration reporting duties, whether earlier allocations were used appropriately, whether previous sponsored roles were genuine, and whether the licence remains A-rated. Sponsors with a strong compliance record are generally viewed more favourably.

Financial and commercial credibility is another significant area of assessment. UKVI may request supporting documentation such as company accounts, payroll records, contracts, evidence of trading activity, organisational charts, funding evidence for salaries, or client agreements and expansion plans. This level of scrutiny is particularly common where the sponsor is newly licensed, operates as a smaller business, works within a sector subject to heightened scrutiny, or is seeking an unusually large increase of undefined certificates within the sponsor licence.

In practice, this means employers must ensure that the details provided through the Sponsor Management System accurately reflect the role, salary and business need. Errors or inconsistencies can delay visa applications or raise compliance concerns, particularly where information does not align with sponsor licence records or previous activity.

For employers, the impact can be significant. Delays may affect recruitment timelines or prevent existing workers from extending their stay before their visas expire. This can create immediate operational pressure and disrupt workforce planning.

A well-prepared request should clearly explain the need for additional Certificates of Sponsorship and be supported by relevant evidence.

This means:

• Providing a clear justification: Explain why the additional Certificates of Sponsorship are required, including whether the request relates to staff retention, recruitment, or structural changes.
• Setting out workforce context: Outline current staffing levels, vacancies, and service demand to demonstrate the operational need.
• Highlighting time-sensitive factors: Identify any upcoming visa expiry dates or urgent recruitment pressures.
• Including supporting evidence: This may include documentation relating to organisational changes, business activity, or recruitment planning.
• Ensuring consistency: The request should align with previous sponsor licence activity and reporting history.

Taking a structured approach to these elements can help reduce the likelihood of delays and improve the chances of approval.

For step-by-step guidance on assigning Certificates of Sponsorship, see the official Home Office guidance.