Certificate of Sponsorship (CoS) Problems & How to Solve Them ​

In this article, we break down the most common CoS problems employers face, how to fix them quickly, and how to prevent them from happening again.

Key Takeaways

• CoS errors are a leading cause of Skilled Worker visa refusals.
• Common issues include incorrect SOC codes, wrong start dates, expired CoS, and using the wrong type.
• Many errors can be corrected before submission, but delays increase the risk.
• Prevent future issues through internal checks, staff training, and legal audits.

If your business has encountered delays or refusals due to a CoS error, seeking legal support early can help prevent more significant compliance issues. Contact us today to resolve issues before they impact your recruitment plans.

What Is a Certificate of Sponsorship and Why Does It Matter

A CoS is an electronic reference number issued by a UK sponsor through the Sponsorship Management System (SMS). It confirms that a genuine job offer has been made to a skilled worker, and that the role meets the eligibility criteria under UK immigration law.

Without a valid CoS, a worker cannot apply for a Skilled Worker visa. Even small mistakes, like an incorrect job code or salary entry, can render the certificate invalid, leading to refusals and delays.

Types of Certificates of Sponsorship Explained

Understanding which CoS to assign is essential:

• Defined CoS: Used when a worker is applying from outside the UK.
• Undefined CoS: Used for workers switching to a Skilled Worker visa inside the UK, or for existing sponsored workers extending their stay.

Using the wrong type of CoS is one of the most common errors employers make, often resulting in visa refusals or wasted application fees.

Common Certificate of Sponsorship Problems Employers Face

Errors in the CoS process are more common than many businesses realise. Frequent issues include:

• Wrong CoS type: Assigning a defined CoS instead of undefined (or vice versa) invalidates the application.
• Incorrect SOC code or salary: If job details don’t meet minimum salary thresholds or eligibility criteria, the visa may be refused.
• Wrong start date: If the start date is inconsistent with the employment contract, UKVI may question the job’s genuineness.
• Exceeded allocation: If your allocation runs out and you assign a CoS beyond your allowance, the certificate will not be valid.
• Expired CoS: A CoS must be used within 3 months of issue. Missing the deadline requires reissuing a new one.
• Invalid sponsor licence: Assigning CoS without a valid licence can result in serious Home Office penalties, including suspension or revocation.

You should know about: Schooling Options for Skilled Worker Visa Dependents in the UK

How These Mistakes Affect a Skilled Worker Visa Application

CoS errors have direct consequences for both employers and sponsored workers:

• Visa refusals: Incorrect CoS details often lead to automatic visa rejection.
• Delays in onboarding: Workers may have to reapply, causing weeks or months of delay.
• Immigration status risks: Sponsored workers may lose their lawful status if their visa application is denied.
• Compliance breaches: Repeated errors may trigger a Home Office compliance audit or sponsor licence downgrade.

How to Fix a CoS Problem Before It Leads to a Refusal

Many CoS issues can be fixed if addressed early:

• Withdraw and reissue: If you notice an error before the visa application is submitted, withdraw the CoS and issue a new one.
• Correct via SMS: Some details (like job title or start date) can be corrected within the Sponsorship Management System before submission.
• Request more allocation: If you’ve run out of certificates, submit a request to UKVI through your SMS dashboard.
• Contact UKVI: In certain complex cases, contacting the Home Office directly may help clarify or resolve a pending CoS issue.

Proactive Compliance Support: Before assigning any new CoS, let our legal team audit your documentation and SMS procedures. We help employers correct errors before they become refusals, protecting your recruitment plans and sponsor licence.

Preventing CoS Problems in Future Sponsorship Rounds

Prevention is far more effective than correction. Best practices include:

• Pre-assignment checks: Verify job codes, salary levels, and eligibility before issuing a CoS.
• HR training: Ensure Level 1 and Level 2 users understand SMS responsibilities.
• Regular audits: Conduct periodic internal reviews to ensure compliance with sponsorship duties.
• Monitor policy changes: Salary thresholds, SOC codes, and immigration rules change frequently; staying up to date avoids costly mistakes.

Get to know about: Skilled Worker Visa Priority & Super Priority Services Explained

Let Our Specialist Immigration Lawyers Help You

If your organisation repeatedly encounters CoS-related problems, or if your sponsor licence is under review, professional legal support is essential. Early intervention can prevent licence suspension, protect ongoing recruitment, and secure the right outcome for sponsored workers.

At Gulbenkian Andonian Solicitors, we have extensive experience resolving complex CoS issues and supporting businesses through sponsorship challenges. Contact us today for tailored legal advice.