UK Certificate of Sponsorship (CoS) Processing Time 2026: Defined vs Undefined Explained

A defined Certificate of Sponsorship (CoS) request is typically processed by the Home Office within 1 working day, and an undefined CoS is allocated immediately from the sponsor's annual quota. Once issued, every CoS is valid for 3 months, during which the sponsored worker must apply for their visa.

What is a Certificate of Sponsorship?

A Certificate of Sponsorship (CoS) is not a paper certificate — it is a unique reference number generated on the Home Office's Sponsor Management System (SMS). A licensed UK employer assigns this number to a foreign worker before that worker can apply for a sponsored work visa, including the Skilled Worker, Health and Care Worker, Senior or Specialist Worker, and Scale-up routes.

For example, if a Manchester-based NHS Trust hires a radiographer from India, the Trust's authorising officer logs into SMS, completes a CoS for the role, and shares the resulting reference number with the worker. The worker then enters that number on their online visa application.

Because the CoS contains the salary, Standard Occupational Classification (SOC) code, working hours and start date, it is the document UK Visas and Immigration uses to verify that the role meets the sponsorship requirements.

How long does a defined CoS take?

A defined CoS is requested by the sponsor on a case-by-case basis for any Skilled Worker visa applicant who is applying from outside the UK. Unlike undefined CoS, defined CoS are not pre-allocated to the sponsor's account — the Home Office must approve each individual request.

According to gov.uk, defined CoS requests are usually decided within one working day. In rare cases, where the Home Office needs additional information (for example, evidence of the genuineness of the role or the resident labour test for shortage roles), the request can be paused and may take up to 18 weeks to resolve.

Recent defined CoS processing times

Period	Typical decision	Notes
Q1 2026	1 working day	Standard cases; no further information requested
Q4 2025	1–2 working days	Slight backlog after the July 2025 Statement of Changes
Q3 2025	1 working day	Returned to baseline after spring surge
Cases with queries	Up to 18 weeks	Genuineness checks, salary thresholds, suspected non-compliance

If you supply complete supporting evidence with your defined CoS request — the worker's personal details, the SOC 2020 occupation code, gross annual salary and confirmed start date — you should expect a decision the next working day.

How long does an undefined CoS take?

An undefined CoS is allocated immediately. When a sponsor licence is granted, or when the sponsor's annual allocation is renewed each April, the Home Office sets an annual cap of undefined CoS the sponsor can issue without prior approval. The sponsor draws down from this cap as needed.

Undefined CoS are used for:

• Skilled Worker applicants who are switching from inside the UK (e.g. a Graduate visa holder moving to a Skilled Worker visa)
• Health and Care Worker visa applicants (regardless of location)
• Most Global Business Mobility routes (Senior or Specialist Worker, Graduate Trainee, etc.)
• Temporary Worker routes such as Creative Worker, Religious Worker, Charity Worker and Scale-up

If a sponsor exhausts their undefined CoS allocation, they can request more through SMS. Increase requests are typically processed within 18 weeks, though most are resolved much sooner. Forward planning is therefore essential for high-volume sponsors such as care providers and consultancies.

What's the difference between defined and undefined CoS?

The two CoS types differ on who they cover, where the worker applies from, how the sponsor obtains them, and how quickly the Home Office responds. The table below summarises every practical difference.

Feature	Defined CoS	Undefined CoS
Who it covers	Skilled Worker visa applicants	Skilled Worker (in-country switch), Health & Care Worker, GBM, Scale-up, Temporary Worker
Worker applies from	Outside the UK	Inside or outside the UK (route-dependent)
How sponsor obtains it	Per-case request via SMS	Annual allocation renewed each April
Home Office decision	~1 working day	Instant from quota
Cap applied	None — case-by-case	Yes — annual sponsor quota
Cost (April 2026)	£239 per CoS	£239 per CoS
Validity once assigned	3 months	3 months

UK CoS application fees (2026)

Fee	Amount	When it applies
Standard CoS fee	£239	Skilled Worker, Health & Care Worker, Senior or Specialist Worker
Temporary Worker CoS	£25	Creative Worker, Charity Worker, Religious Worker, GAE, Seasonal Worker
Immigration Skills Charge (per year)	£1,000 (large sponsor) / £364 (small or charitable)	Paid when assigning CoS for Skilled Worker and Senior or Specialist Worker
Restricted CoS	Withdrawn	Restricted CoS were abolished in 2020 when the cap on Tier 2 (General) was removed

Always confirm the current fee with the official gov.uk sponsorship fees page before submitting payment, as fees are reviewed annually each spring.

What happens if the Home Office delays my CoS?

While the headline processing time is one working day for defined CoS, occasional delays do happen. If your CoS request is still outstanding after 5 working days, take these steps in order:

1. Check SMS messages. Log in to the Sponsor Management System and review the CoS request. The Home Office may have requested additional information — for example, evidence of the genuineness of the vacancy or proof that the salary meets the going rate for the SOC code.
2. Respond promptly to information requests. The clock pauses while the Home Office waits for your reply, so a quick response keeps the case moving.
3. Email the sponsor business helpdesk. Use BusinessHelpdesk@homeoffice.gov.uk with your sponsor licence number, CoS reference and a brief chronology. Responses typically arrive within 5–10 working days.
4. Escalate to your account manager. Premium Customer Service holders (annual subscription £25,000 + VAT) can raise the matter directly with their named account manager for same-day attention.
5. Submit a service complaint. If the case has been outstanding for more than 20 working days with no Home Office contact, you can lodge a formal complaint via the UKVI complaints procedure.

How long is a CoS valid once assigned?

Once a sponsor assigns a CoS to a worker, it carries a 3-month validity window. The worker must submit their visa application before that window closes, otherwise the CoS expires and a new one (with a fresh fee) must be assigned.

Two practical points to remember:

• The worker can start the visa application up to 3 months before the start date shown on the CoS.
• If the worker withdraws or the visa is refused, the sponsor should report the change of circumstances on SMS within 10 working days. Withdrawn CoS cannot be reused, but they can be replaced with a new CoS for a different applicant if the role is still open.

What information goes on a CoS?

The information you enter on a CoS must mirror the offer of employment exactly — mismatches are one of the most common reasons for visa refusal. Mandatory fields include:

• SOC 2020 occupation code — the four-digit Standard Occupational Classification code that determines whether the role is eligible for sponsorship and what the going rate is. Choosing the wrong SOC code is one of the most frequent triggers for a Home Office query.
• Job title and main duties — a clear description of what the worker will be doing day to day. The duties must align with the SOC code chosen and reflect a genuine vacancy.
• Gross annual salary — expressed in pounds sterling. Allowances and one-off bonuses cannot be counted towards the salary threshold; only guaranteed basic pay counts.
• Working hours per week — the role must be at least the minimum hours required by the route (typically a regular paid pattern of 30–48 hours per week).
• Start and end dates — the start date can be no more than 3 months after the CoS is assigned; the end date determines the length of leave granted, up to 5 years on most routes.
• Work address — primary place of work, including any branches or client sites where the worker will spend significant time.
• Worker's personal details — full name (as on passport), date of birth, nationality and passport number. Any spelling mistake here can invalidate the visa application.
• Sponsor note — a free-text field where sponsors can add context, e.g. confirmation that the role is on the Immigration Salary List or a continuing employment justification.

Practical tips for sponsors and workers

To keep the CoS process running smoothly and avoid the rare Home Office hold-up, both sides should follow a few proven habits.

For sponsors

• Plan your annual allocation in March. Sponsor allocations renew each April. Forecast your hiring pipeline and request an increase early, before you exhaust the quota mid-year.
• Use clear sponsor notes. A two-line note explaining unusual salary structures (e.g. shift premiums excluded), continuing employment, or Immigration Salary List eligibility prevents most Home Office queries.
• Audit before you assign. Cross-check the CoS draft against the contract of employment, right-to-work documents and the latest going-rate tables on gov.uk.
• Track CoS expiry dates. A simple spreadsheet noting each CoS reference and its 3-month deadline avoids wasted £239 fees.

For workers

• Apply within 30 days. Don't wait the full three months — biometric appointment slots in popular cities such as London, Mumbai and Lagos can fill up weeks in advance.
• Verify your CoS details. Ask your sponsor for a copy of the CoS print-out and check your name, passport number and salary before paying any visa fees.
• Keep your sponsor in the loop. If your travel plans change, tell your sponsor so they can update the start date or assign a fresh CoS if needed.
• Save the CoS reference securely. You'll need it again at the visa appointment, on arrival in the UK and when collecting your eVisa or BRP.

Frequently asked questions

How long does a CoS take to come out in 2026?

For most cases, a defined CoS is issued within 1 working day of submitting the request through the Sponsor Management System. Undefined CoS are issued instantly because they are drawn from the sponsor's pre-allocated annual quota. The CoS reference number is then shared with the worker for their visa application.

Can I apply for a UK visa before my CoS is issued?

No. The CoS reference number is a mandatory field on the visa application form. You must wait until your sponsor has assigned the CoS and shared the reference with you before starting the online visa application. The good news is that the visa application form can be completed and the appointment booked the same day the CoS is issued.

How much does a Certificate of Sponsorship cost?

The standard CoS fee in April 2026 is £239 for Skilled Worker, Health and Care Worker and Senior or Specialist Worker routes. Temporary Worker CoS cost £25. The sponsor may also need to pay the Immigration Skills Charge (£1,000 per year for large sponsors, £364 for small or charitable sponsors). Most sponsors recover none of these fees from the worker, as charging the worker for the CoS or skills charge is prohibited.

What happens if my CoS expires before I apply?

If the 3-month validity window passes without a visa application being submitted, the CoS lapses and cannot be revived. The sponsor must assign a new CoS, paying the £239 fee again. To avoid this, plan the visa application around the date the CoS will be assigned and book the biometric appointment as soon as the CoS reference is shared.

Is the CoS the same as a sponsor licence?

No. A sponsor licence is the authorisation that allows an employer to sponsor migrant workers; it lasts 4 years and costs £536 (small sponsor) or £1,476 (large sponsor) to obtain. A Certificate of Sponsorship is the per-worker reference that the licensed sponsor assigns to a specific applicant. You need a sponsor licence first; the CoS comes later. Read our companion guide on sponsor licence processing times for the full timeline.

Related reading on Tarve

• UK Sponsor Licence Processing Time 2026 — how long it takes a UK employer to get licensed.
• UK Sponsor Licence Guide for Employers 2026 — eligibility, documents and post-licence duties.
• UK Visa Sponsorship Costs 2026 — full cost breakdown for sponsors and workers.
• How Long Does UK Visa Sponsorship Take? — end-to-end timeline from job offer to BRP.

Source: Workers and Temporary Workers: guidance for sponsors (gov.uk), accessed April 2026. This article is provided for general information only and does not constitute legal or immigration advice.