The Moon Fish High Court judgment highlights how lawful unpaid leave, salary records and sponsor reporting duties can intersect. UK sponsor licence holders should ensure HR, payroll and immigration processes remain closely aligned.
For businesses that hold a UK Sponsor Licence, the High Court judgment in R (Moon Fish Limited) v The Secretary of State for the Home Department [2026] EWHC 2289 (Admin) provides an important reminder that sponsor compliance is often won or lost in the detail.
The case concerned a sponsored worker whose pay was lower than the salary recorded on the Certificate of Sponsorship because he had taken authorised unpaid compassionate leave. The leave itself was lawful. The compliance issue arose because the period of unpaid leave and the resulting lower pay had not been reported to UK Visas and Immigration (UKVI).
The judgment also reinforces a wider point for employers: sponsor compliance does not end once a Certificate of Sponsorship has been assigned. Duties continue throughout the sponsored worker’s employment, and everyday HR decisions involving absence, pay, working hours or employment conditions can have immigration consequences if they are not reviewed and reported correctly.
What Happened in the Moon Fish Case?
Moon Fish Limited held a sponsor licence and employed sponsored workers.
UKVI requested employment records, including salary information. The records showed that one sponsored worker had received less pay than the annual salary stated on his Certificate of Sponsorship during May and June 2025.
The reason was that the worker had taken unpaid compassionate leave between 27 April and 22 June 2025.
The High Court recorded that the period of leave and the resulting lower payment were lawful and did not, in themselves, breach the sponsorship rules. However, the employer had not reported the period of unpaid leave to UKVI, and Moon Fish accepted that this amounted to a breach of its reporting obligations.
UKVI treated the lower payment as falling within a mandatory ground for sponsor licence revocation and revoked the licence with immediate effect.
What Did the High Court Decide?
The High Court rejected UKVI’s interpretation that any unreported lower payment compared with the salary stated on a Certificate of Sponsorship automatically amounted to an unreported salary change falling within the mandatory revocation ground relied upon.
The Court distinguished between:
- a genuine reduction or change in a sponsored worker’s salary; and
- a lower payment resulting from an otherwise legitimate period of unpaid leave.
The Court concluded that lawful unpaid leave does not necessarily amount to a “change of salary” simply because the worker receives less pay during the relevant period.
Importantly, the employer’s failure to report the unpaid leave remained a breach of sponsor duties. However, the Court considered that this should fall within the non-mandatory compliance framework rather than automatically triggering the mandatory revocation ground relied upon by UKVI.
The High Court ultimately concluded that the revocation decision was flawed, quashed it and remitted the matter to the Secretary of State for reconsideration.
Why Does the Judgment Matter for Sponsor Licence Holders?
The judgment is important because it draws a distinction between legitimate unpaid absence and a substantive salary reduction.
A period of reduced pay caused by authorised unpaid leave does not automatically mean that an employer has changed the sponsored worker’s salary.
However, sponsors should not interpret the judgment as removing their reporting obligations.
The Court expressly recognised that Moon Fish had still failed to report the period of unpaid leave. The key distinction was that the reporting breach should not automatically have been treated as the mandatory revocation ground relied upon by UKVI.
Current Home Office sponsor guidance continues to require sponsors to monitor sponsored workers and report relevant absences, salary changes and other changes in circumstances. The guidance also confirms that failures to comply with sponsor duties can lead to compliance action, including suspension, downgrading or revocation of a sponsor licence.
For employers, the practical message is therefore not that unpaid leave is risk-free, but that the reason for lower pay, the duration of the absence, the reporting requirements and the employer’s records all matter.
Practical Lessons for Employers
Do not separate HR from sponsor compliance
A lawful HR decision can still trigger immigration reporting obligations.
If a sponsored worker takes unpaid leave, reduces their hours or experiences another change affecting pay or employment conditions, the immigration implications should be reviewed alongside the HR decision.
Payroll records matter
UKVI may identify a lower payment through payroll or HMRC data before it has the wider HR context explaining why the reduction occurred.
The Moon Fish case itself arose after UKVI requested employment and salary records.
Employers should therefore ensure that payroll, HR and immigration records tell the same story.
Maintain a clear audit trail
Where a sponsored worker receives reduced pay because of authorised leave, employers should retain clear evidence explaining:
- the reason for the absence;
- the dates of the absence;
- whether the absence was authorised;
- why pay was reduced;
- any relevant internal approvals; and
- whether an SMS report was required and, if so, when it was made.
Report relevant changes on time
A legitimate reason for an absence does not remove the need to consider sponsor reporting obligations.
Current sponsor guidance contains specific rules around absences without pay or on reduced pay and requires reporting in certain circumstances. Employers should therefore review the facts of each case rather than assuming that an authorised absence requires no immigration action.
Take UKVI correspondence seriously
A request for payroll records, employment documents or other evidence may form part of a wider compliance review.
Businesses should ensure responses are accurate, complete and properly contextualised, particularly where salary records could otherwise appear inconsistent with the Certificate of Sponsorship.
The Current Sponsor Enforcement Climate
The Moon Fish judgment comes at a time of significant Home Office scrutiny of sponsor licence holders.
Analysis of Home Office migration transparency data by the Work Rights Centre found that between July 2025 and June 2026, 4,840 Skilled Worker sponsor licences were suspended and 4,403 were revoked.
Those figures represented substantial increases compared with the preceding 12-month period and demonstrate the importance of treating sponsor compliance as an ongoing business responsibility rather than a one-off requirement at the point of licence application.
Although sponsor enforcement has been particularly visible in some sectors, any organisation sponsoring overseas workers should be prepared for UKVI to review matters including salary records, absences, job duties, work locations and internal reporting systems.
What Should Sponsors Do Now?
Sponsor licence holders should review how HR, payroll and immigration teams communicate with one another.
In practice, businesses should have a clear internal process for:
- identifying sponsored workers;
- escalating unpaid or reduced-pay absences;
- reviewing changes to salary or working arrangements;
- checking whether a change must be reported through the Sponsor Management System;
- recording the reason for any change or absence;
- retaining supporting evidence; and
- ensuring reporting deadlines are monitored.
Businesses should also consider periodic immigration compliance reviews to identify weaknesses before they are raised during a Home Office audit or document request.
If a reporting deadline has already been missed, employers should consider taking advice before making a retrospective report or responding to UKVI.
The timing, explanation and supporting evidence may influence how the issue is assessed.
How Hudson McKenzie Can Help
Hudson McKenzie advises UK employers on sponsor reporting duties, immigration compliance audits, UKVI document requests, licence suspensions and revocation risks.
We can assist businesses in assessing whether a change should have been reported, reviewing supporting records and strengthening internal HR and sponsor compliance processes.
Hudson McKenzie also provides immigration training to help HR and mobility teams understand their responsibilities as sponsor licence holders.
If you are concerned about a missed report, reduced pay, unpaid leave or another sponsor compliance issue, contact Hudson McKenzie before responding to the Home Office.
Disclaimer: The information provided in this article is for general guidance only and does not constitute legal advice.
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