What a CoS is, how sponsors issue it, and the documents candidates should prepare before they pay visa fees — written for busy professionals, not for jargon collectors.
What a Certificate of Sponsorship (CoS) is
A CoS is an electronic record, not a paper certificate. A licensed sponsor assigns it to you so you can apply for a Skilled Worker visa. The CoS contains a reference number you enter in your application.
Employer-side steps (what delays assignments)
Sponsors must:
- Hold a valid sponsor licence
- Define a role that meets skill and salary thresholds
- Pay required fees and comply with reporting duties
If HR is new to sponsorship, internal approvals can take longer than the candidate expects.
Candidate-side preparation
Before you apply, gather:
- Passport with adequate validity
- TB test results if required for your country
- Police certificates where requested
- Proof you meet the English language requirement
- Maintenance funds evidence unless exempt
Common misunderstandings
- A job offer letter alone is not a visa.
- A CoS has a limited window — do not let it expire.
- Immigration Health Surcharge (IHS) adds meaningful cost; budget early.
Europe beyond the UK
Ireland, Germany, Portugal, and other EU/EEA markets use different systems — salary thresholds, recognition of qualifications, and Blue Card options vary. If you are comparing London with Berlin or Dublin, compare net pay, visa renewal rules, and path to long-term residence together, not separately.
Disclaimer
UK immigration rules change with Home Office updates. Verify salary thresholds and occupation codes on official guidance before you commit to relocation dates.