What Is a Certificate of Sponsorship?
A Certificate of Sponsorship (CoS) is a critical digital document issued by a UK-licensed employer to a foreign national they intend to employ. While the term may sound like a formal certificate, it’s essentially an electronic record containing a unique reference number. This number is required when applying for a work visa—most commonly the Skilled Worker visa UK.
The certificate confirms that the role offered meets the criteria set by the UK Home Office, and that the sponsoring organisation accepts responsibility for the applicant during their stay.
Who Needs a Certificate of Sponsorship?
Any non-UK national seeking to work in the UK under a sponsored visa route will need a valid CoS. This includes professionals in healthcare, IT, engineering, and other roles on the Shortage Occupation List. Without a CoS, even the most qualified candidate cannot proceed with their visa application.
Employers must first become licensed sponsors before they can issue certificates. This requires an application to the Home Office, demonstrating compliance with immigration and employment laws. At Visa Simple, we assist both individuals and businesses in navigating this often complex process efficiently.
Types of Certificates: Defined vs. Undefined
There are two main types of sponsorship certificates:
- Defined CoS: Issued for workers applying from outside the UK. These must be requested by the employer through the Sponsor Management System (SMS).
- Undefined CoS: Used for applicants already in the UK, such as those switching visa categories or extending their current visa.
Understanding which type applies to your situation is essential. Visa Simple helps employers avoid unnecessary delays by providing clear, tailored guidance on CoS allocations and usage.
Employer Responsibilities and Compliance
UK employers have legal obligations when sponsoring a foreign worker. This includes:
- Ensuring the role meets the salary and skill thresholds
- Keeping accurate records of employment
- Reporting any changes in circumstances via the SMS
Failure to meet these requirements can result in licence suspension or revocation. With Visa Simple’s support, employers can maintain full compliance while streamlining their hiring process.
The Role of the Certificate in the Skilled Worker Visa Process
The CoS is just one part of the broader Skilled Worker visa UK application. Once the certificate is issued, the applicant must use the unique reference number to submit their visa application. Other requirements include proof of English language proficiency, a valid passport, and sometimes a tuberculosis test result, depending on the applicant’s country of origin.
We guide our clients through every stage of this process—from initial job offer to visa decision—ensuring all supporting documents align with Home Office expectations.
How Visa Simple Can Support You
Whether you're an employer looking to expand your workforce or a skilled professional seeking to work in the UK, Visa Simple is here to help. Our experienced immigration consultants assist with:
- Sponsor licence applications
- Certificate of Sponsorship issuance
- Skilled Worker visa submissions
- Compliance audits and ongoing sponsor guidance
We pride ourselves on offering clear, honest advice that’s tailored to your unique goals. From startups to established companies, we simplify sponsorship and ensure a smooth path to legal employment in the UK.
Conclusion: Get It Right the First Time
A Certificate of Sponsorship isn’t just a formality—it’s a legal necessity and the foundation of a successful UK work visa application. With changing immigration rules and strict employer obligations, it’s more important than ever to get professional support.
At Visa Simple, we make complex processes feel simple. Contact us today to find out how we can help you secure a CoS and move forward with confidence.