Reporting Changes in the Sponsor Management System: A 2026 Employer Guide

UK employers with a sponsor licence must report certain changes to the Home Office through the Sponsor Management System (SMS) within fixed deadlines – 10 working days for most changes affecting a sponsored worker and 20 working days for most organisational changes. Missing either window is a breach of your sponsor duties and can trigger a compliance visit, a suspension, or revocation of your licence, even where the underlying employment is entirely genuine.

This guide is for HR managers, Level 1 Users and business owners who hold a sponsor licence. It explains which events trigger a reporting obligation, which deadline applies, and what the Home Office’s updated October 2026 caseworker guidance signals about how UKVI now assesses those reports. For the wider picture of all your duties as a sponsor, see our sponsor licence compliance duties page.

This guide deals specifically with reporting changes in the Sponsor Management System.

On 20 October 2026, the Home Office updated its caseworker guidance on maintaining a sponsor licence – the first revision since December 2023. This is the guidance UKVI caseworkers apply when auditing a sponsor’s compliance record, including how they assess your SMS entries during a site visit or remote review.

The update clarifies how caseworkers assess three types of organisational event in particular: new Key Personnel appointments, mergers and acquisitions, and TUPE transfers involving sponsored workers. It also restates the reporting deadlines. No underlying rule has changed. The reporting windows – 10 working days, 20 working days, 5 working days for evidence – remain the same.

What the update does signal is that UKVI has actively reviewed its compliance framework for the first time in almost three years. Sponsors can expect caseworkers to apply the clarified guidance consistently during visits and audits. If your organisation has been through a merger, a restructure, a TUPE transfer, or a change of Key Personnel in the past two years, and your SMS record was not updated at the time, that is the gap the October 2026 update is most likely to expose.

This is not a reason to panic. It is a reason to review.

Reporting obligations in the SMS fall into three categories. Each carries its own deadline. Knowing which category an event falls into before the clock starts is the difference between a compliant record and a missed window.

Most changes that affect a worker you sponsor must be reported within 10 working days of the date the event occurred. The following events are the most common triggers:

• A sponsored worker does not start work on their agreed start date
• A sponsored worker is absent from work without permission for 10 or more consecutive working days
• A sponsored worker’s contract ends earlier than stated on the Certificate of Sponsorship (CoS) – whether through resignation, dismissal, or mutual agreement
• A significant change to a worker’s role, salary, or work location
• A sponsored worker is placed on unpaid leave beyond what is permitted under the sponsorship rule

“Significant” in the context of salary or role changes is not defined by a fixed percentage in the standard guidance. In practice, a change that materially alters what was stated on the CoS at the time of assignment should be treated as reportable. Where there is doubt, the safer course is to report. A change that goes unreported and is later identified by UKVI – for example, through a payroll cross-check during a compliance visit – is treated as a deliberate failure, not an administrative oversight.

Changes that affect the sponsor organisation itself carry a 20 working day reporting window. These are the events most often missed, because they tend to sit outside the HR function – in the boardroom, in the legal team, or in a finance restructure – with no one thinking to flag them to the Level 1 User.

Changes that must be reported include:

• A change to your organisation’s registered name or principal trading name
• A change to your registered address or principal place of business
• A merger, acquisition, or change of ownership or corporate structure
• A TUPE transfer where sponsored workers move to a new employing entity
• Changes to Key Personnel – a new Authorising Officer, a new Key Contact, or a change to your Level 1 User arrangement
• An insolvency event or significant financial restructuring that may affect your ability to meet your sponsor duties

The October 2026 guidance update addresses each of these events specifically. Caseworkers now have clearer instructions on how to assess whether a merger or TUPE transfer was reported correctly and on time. The practical effect is that sponsors whose SMS record shows one of these events – or whose SMS record does not show it but should – are more exposed than they were before the update.

Mergers and TUPE transfers deserve particular attention. The legal team handling the transaction may have no awareness that an SMS report is required. A TUPE transfer that moves sponsored workers to a new legal entity may also require the new entity to hold its own sponsor licence before those workers can continue in employment. Neither of these steps happens automatically. Both require deliberate action within the 20-day window.

Where UKVI requests evidence from you – as part of a compliance check, a CoS allocation review, or a licence query – you have 5 working days to respond. This is the shortest of the three windows, and it applies whether the request arrives by email, by post, or through the SMS inbox.

UKVI does not routinely grant extensions to this deadline. A failure to respond within 5 working days can be cited as a basis for compliance action independently of the substance of the original query. If you receive a request and are uncertain whether it is genuine, contact your immigration adviser immediately rather than waiting.

Reporting changes in the Sponsor Management System is done through the SMS portal, accessed via GOV.UK. Only your appointed Level 1 User can submit reports on behalf of your organisation. Level 2 Users can report certain worker-level changes but cannot amend your organisation’s licence details.

The portal creates a timestamped record at the point of submission. UKVI treats that timestamp as evidence of both the reported change and the date you reported it. The timestamp does not back-date to the event itself. If the event occurred on 1 October and you log in to report it on 15 October, the record shows a 10 working day gap – which is the gap UKVI will assess against your compliance obligations.

Three disciplines prevent most reporting failures:

1. Date from the event, not from discovery. The 10-day and 20-day windows run from the date the event occurred. If a worker resigned on 1 October and HR found out on 8 October, the clock started on 1 October. Build your internal process around this. When HR is notified of an event, the first question should be: when did this actually happen?
2. A compliance calendar per worker, owned by a named person. One shared document, one entry per sponsored worker, tracking start date, contract end, and any known upcoming changes. One named owner who is responsible for checking it. That structure catches nearly every common failure before the deadline passes.
3. A second Level 1 User at all times. The single most common structural vulnerability we see in SMS audits is a licence with only one Level 1 User who then leaves the business. When that happens, portal access stalls and every pending report sits overdue while replacement credentials are arranged. Appoint a second user before you need one.

For a full guide to setting up and operating the SMS – including how Key Personnel roles work, how to configure access for the first time, and how CoS allocation interacts with your SMS duties – see our Sponsor Management System guide.

The following patterns are drawn from Conroy Baker’s employer compliance advisory work. They are the situations that most reliably produce a suspension letter or a compliance visit – and the contrasting practices of the employers who avoid them.

Mergers and restructures treated as a legal matter, not a compliance matter. The deal closes, lawyers sign off, Companies House is updated – and nobody tells the Level 1 User. The SMS continues to show the old legal name or structure for months. When a caseworker reviews the record during an audit, the discrepancy is not treated as an administrative delay. It is treated as an unreported organisational change.

TUPE transfers with no SMS entry. A TUPE transfer moves employees – including sponsored workers – from one employing entity to another. The transfer may be legally compliant in every employment law respect. But if the sponsored workers have transferred to a new legal entity that does not hold its own sponsor licence, and no report was submitted to the Home Office, the sponsor has a serious compliance gap. The October 2026 guidance update specifically clarifies how caseworkers assess TUPE-related SMS entries.

Salary increases updated on payroll but not reported in the SMS. A sponsored worker receives a pay rise. HR updates the payroll system. The SMS record still shows the original salary stated on the CoS. UKVI runs a payroll cross-check during a routine compliance visit and finds the discrepancy. The employer had no intention of concealing anything. The failure was process-level: nobody connected the payroll change to the SMS reporting obligation.

A single Level 1 User who leaves the business. This is covered in more detail in our Sponsor Management System guide. It is the most common reason an otherwise straightforward SMS report ends up overdue: the person with portal access has left, and their replacement has not yet been registered. The fix is structural – a second user, set up before it is needed – not reactive.

A standing question in every legal and boardroom process. Before any merger, acquisition, restructure, personnel change above a certain level, or significant property transaction is finalised, one question is asked: does this trigger an SMS reporting obligation? That question, built into the sign-off checklist for any material organisational change, catches the events that fall through the gap between the legal team and the compliance function.

A compliance calendar with named ownership. One document, one entry per sponsored worker, one named owner. The deadlines are in the calendar before the events happen, not entered after the fact. This is not a sophisticated system. It is a discipline. The employers who run it without gaps are the ones who do not appear in our suspension casework.

Periodic independent SMS audits. A review of the SMS record against HR files, payroll records, and Companies House at least once a year. The purpose is to identify any discrepancy before UKVI does – and to correct it in an orderly way rather than under compliance pressure.

In one recent matter, Conroy Baker was instructed after a client received a UKVI compliance query following a corporate restructure. The restructure had been completed correctly in employment law terms. The SMS had not been updated within the 20-day window. We prepared a documented response setting out the facts, the timeline, and the steps the client had taken to correct the record. The outcome was a formal warning rather than a suspension. Earlier professional involvement – at the point the restructure completed, not after the query arrived – would have prevented the compliance action. The client now has a standing process that ensures this does not happen again.

UKVI can suspend or revoke a sponsor licence for SMS reporting failures alone, without reference to whether the underlying employment was genuine. The legal test is not intent. It is whether the report was submitted on time.

Suspension typically follows where UKVI identifies a pattern of missed reports, a failure to respond to an evidence request within the 5-day window, or a single significant unreported event such as a merger, a TUPE transfer, or the departure of the sole Authorising Officer. A suspension notice requires an urgent response, usually within a short and fixed window set by UKVI.

Revocation is the more serious outcome. It carries a cooling-off period before the organisation can apply for a new licence, and it immediately affects every sponsored worker employed under that licence.

If your organisation has already received a compliance query or a suspension notice, see our guidance on sponsor licence suspension and revocation, including what to do in the first 48 hours after a notice arrives.