Section 3C Leave: A 2026 Guide for UK Sponsors

Key Points

• Section 3C leave continues a worker's existing permission when a valid application is made before it expires

• It only applies where the application is valid; an application rejected as invalid does not trigger it

• Section 3C continues existing conditions, so it does not permit a worker to start a new sponsored role

• Proving Section 3C is a common practical problem, because it may not be visible on an eVisa

• An existing employer has up to 28 days of continued statutory excuse past expiry; a new employer has none

• Section 3C ends when the application is decided, and it lapses if the worker leaves the UK

Introduction

Section 3C of the Immigration Act 1971 is one of the most consequential provisions in UK immigration for employers, and one of the least well understood. It is what keeps a worker lawfully in the UK, and lawfully in your employment, when their permission expires before the Home Office has decided their application.

For sponsors, Section 3C usually surfaces at an awkward moment: a visa is days from expiring, an application is pending, and somebody in HR needs to decide whether the person can keep working, or start at all.

This guide sets out what Section 3C is, when it applies, how long it lasts, how to evidence it, and the specific situations where sponsors most often get it wrong.

What Is Section 3C Leave?

Section 3C extends a person's existing immigration permission, and the conditions attached to it, where they make an in-time application to extend or vary their stay. In-time means the application was made before the existing permission expired.

Where it applies, the worker continues to hold leave while awaiting a decision, and while any appeal or administrative review they are entitled to is pending. Existing rights, including the right to work, continue on the same terms.

The important framing is that Section 3C is a continuation, not a new grant. Nothing new is given. What the worker already held is held open.

When Section 3C Applies: The Validity Requirement

Section 3C only operates where the application made is valid. This is where most problems begin.

A Skilled Worker application normally requires a Certificate of Sponsorship reference number. Where a sponsor is still waiting on a CoS allocation, an application submitted without that reference can be rejected as invalid. An invalid application does not trigger Section 3C, which means a worker who applied in good time may have no protection at all.

Home Office caseworker guidance recognises that a CoS reference may be missing and requires the applicant to explain why. Where the delay is attributable to UKVI rather than to the worker or sponsor, a request can be made for the application to be held, supported by a covering letter setting out the applicant's details, current status, the sequence of events, and evidence of the delay.

How Long Does Section 3C Leave Last?

Section 3C continues until the application is decided. It also continues while an in-time appeal or administrative review against that decision is pending, and during the period in which such a challenge could still be brought.

For decisions made in the UK, an administrative review must generally be made within 14 calendar days of notification of the decision, and is normally determined within 28 calendar days. Permission to work continues during that window.

There is no fixed maximum. A worker may hold Section 3C leave for weeks or for many months, depending entirely on Home Office processing.

What Section 3C Does Not Give You

Because Section 3C continues existing permission and its associated conditions, it does not confer the conditions of the role a worker has applied for.

Where a worker has been assigned a Certificate of Sponsorship by a new sponsor and their application is pending, Section 3C does not permit them to begin working for that new sponsor. Home Office guidance is explicit that where an employee is undertaking a role different from the one for which the certificate of sponsorship was issued, the employer is employing the worker illegally.

Civil penalties for employing an illegal worker reach up to £60,000 per worker, and can affect an organisation's ability to sponsor in future. The worker remains with their existing sponsor, on their existing terms, until a decision is made.

How to Prove Section 3C Leave

Proving Section 3C is a genuine practical difficulty. The provision operates as a matter of law, but it is not always visible as a status on an eVisa, and employers, landlords and banks frequently look at an expiry date and refuse.

The online right to work checking service

Where a worker holds an eVisa and has an outstanding in-time application, the employer should ask for a share code and complete a check through the Home Office online right to work checking service. Where the check confirms the right to work, it provides a statutory excuse for six months, after which a follow-up check is required.

The Employer Checking Service

Not every case is supported by the online service. Where a worker with an outstanding in-time application cannot provide a share code, the employer should contact the Employer Checking Service, which aims to respond within five working days. A Positive Verification Notice provides a statutory excuse for six months from the date stated on it.

Employers should wait at least 14 calendar days after the application was submitted before requesting a check, as most cases take that long to register on Home Office systems. Requests made earlier are a common cause of avoidable alarm.

What the worker should keep to hand

• The UKVI submission confirmation or receipt, showing the application was made before expiry

• The unique application number

• Evidence of their previous permission and its expiry date

The 28-Day Grace Period, and Who It Does Not Cover

Where an employer previously carried out a valid right to work check and is reasonably satisfied that the employee has an outstanding application, their statutory excuse continues for up to 28 calendar days past the expiry date, allowing time to obtain a Positive Verification Notice or complete an online check.

This grace period does not apply to checks carried out before employment commences. A new employer therefore has no equivalent cover, and should delay the start date until a prescribed check is completed or a six-month Positive Verification Notice is received.

Travel While an Application Is Pending

Section 3C extends leave to remain and not leave to enter. It therefore operates only while the worker is in the UK, and it lapses if they leave the country. Workers relying on Section 3C should take advice before making travel arrangements while an application is pending.

What Happens When Section 3C Leave Ends

Section 3C ends when the application is decided and any in-time challenge is exhausted. Where permission is granted, the worker moves onto the new conditions and the employer should complete a fresh right to work check in the normal way.

Where the application is refused and no further challenge is available, leave ends. Continuing to employ someone in those circumstances, once the employer is aware, removes any statutory excuse. Employers should act promptly and take advice rather than allow the position to drift.

Where CoS Delays Create Section 3C Problems

In sponsored employment, most Section 3C questions are downstream of a single cause: a Certificate of Sponsorship that arrived later than the business planned for.

Standard CoS allocation requests can take several weeks or months. The CoS priority service aims to reduce this to around five working days once payment is accepted, at a fee of £350, with a limited number of slots released each working day. Sponsors who anticipate allocation needs in advance rarely face a Section 3C question at all.

Frequently Asked Questions

1. What is Section 3C leave?

It is a provision that continues a person's existing immigration permission, and its conditions, where they applied to extend or vary their stay before that permission expired and the application has not yet been decided.

2. Does an in-time application always trigger Section 3C?

No. The application must also be valid. An application rejected as invalid, including for a missing CoS reference number, does not trigger Section 3C.

3. How do I prove I have Section 3C leave?

Through a share code and the Home Office online right to work checking service where supported, or through a Positive Verification Notice obtained by the employer from the Employer Checking Service. Keep your submission confirmation and application number to hand.

4. Can a worker on Section 3C start a new sponsored role?

No. Section 3C continues existing conditions. Beginning a role covered by a new certificate of sponsorship before the application is decided means the employer is employing the worker illegally.

5. How long does Section 3C leave last?

Until the application is decided, and through any in-time appeal or administrative review. There is no fixed maximum.

6. What happens if the worker travels abroad?

Section 3C lapses on departure from the UK, as it extends leave to remain rather than leave to enter.

Final Takeaway

Section 3C is a protection rather than a solution. It works only where the application is valid, it preserves existing conditions rather than granting new ones, it can be difficult to evidence, and it disappears the moment the worker leaves the UK.

For sponsors, the practical lesson is that Section 3C questions are almost always the consequence of an allocation timeline that slipped. Securing CoS allocation early, and using the priority route where a deadline is genuinely at risk, removes the problem before it arises.

Atlas Priority Services helps UK sponsors secure priority slots for CoS allocation requests. Sponsors can check whether their organisation qualifies using our Company Eligibility Checker.