A routine period of authorised unpaid compassionate leave led to the immediate revocation of an employer’s sponsor licence. Although the High Court later quashed the decision, the case highlights a significant risk for every business that sponsors – or plans to sponsor – overseas workers: an ordinary and legitimate employment decision can have serious immigration consequences if HR, payroll and sponsor reporting processes are not properly aligned.
In Moon Fish Ltd v Secretary of State for the Home Department, the High Court confirmed that the Home Office must act fairly, even where it considers that the Sponsor Guidance requires mandatory revocation. However, the judgment did not establish that Moon Fish Ltd had complied with all of its sponsor duties. The case therefore draws an important distinction between an unlawful revocation decision and a separate reporting failure that remained capable of attracting enforcement action.
Moon Fish Ltd sponsored three workers. During a Home Office investigation, it was asked to provide documents concerning possible differences between the workers’ actual pay and the salaries recorded on their Certificates of Sponsorship. The information supplied identified a salary discrepancy relating to May and June 2025, which arose because one employee had taken a period of authorised unpaid compassionate leave.
Without seeking a further explanation, the Home Office revoked the company’s sponsor licence with immediate effect, relying on a mandatory revocation ground based on the apparent salary shortfall. After unsuccessful attempts to secure reconsideration, the company brought judicial review proceedings.
The Home Office argued that the sponsorship regime excluded any wider duty of procedural fairness because sponsorship is voluntary and a sponsor licence is a “privilege rather than a right”. The Court rejected that argument. The information request had been framed in abstract terms: it neither identified the particular underpayment under investigation nor invited an explanation for the apparent discrepancy. Moon Fish Ltd was therefore denied a meaningful opportunity to explain, before the decision was made, that the reduction in pay arose from authorised compassionate leave.
The Court also found that the mandatory revocation ground had been applied incorrectly. The reduction in pay resulted from a period of lawful unpaid leave and did not, in itself, amount to an unreported change in salary. The revocation decision was therefore quashed.
The judgment was a procedural victory, not a finding that Moon Fish Ltd had complied with every sponsor duty. The company had not reported the period of unpaid leave and resulting reduction in pay through the Sponsor Management System, potentially engaging a separate discretionary ground for revocation. The case therefore illustrates how a legitimate employment decision – such as unpaid leave, reduced hours or a temporary salary change – can create a significant compliance risk if its immigration implications are not identified and any required report is not made.
Existing sponsors should ensure that HR, payroll and those responsible for the Sponsor Management System share information promptly. Any proposed change affecting a sponsored worker’s pay, hours, duties or working pattern should trigger an immigration compliance check before it is implemented, wherever possible, to establish whether the change is permitted and whether it must be reported. Clear records should be kept of the decision, the compliance assessment and any report made.
Businesses applying for a sponsor licence should put those controls in place before they begin sponsoring workers. Responsibility for identifying and reporting relevant changes must be clearly allocated, and payroll information should be checked against the details recorded on each Certificate of Sponsorship. A licence application may establish that a business is eligible to become a sponsor; it does not, by itself, demonstrate that the business is operationally ready to remain compliant.
Sponsors should also treat any Home Office request for information as a potential compliance investigation, even where the wording appears broad or routine. A response should do more than provide the documents requested: it should identify and explain any apparent discrepancy, set out the relevant factual and legal context, and address the applicable sponsor duties directly. If the scope of the request is unclear, clarification should be sought rather than the ambiguity being left unaddressed.
The judgment provides an important safeguard against unfair Home Office decision-making, but its wider message is preventative. Sponsors must ensure that ordinary workforce decisions are assessed through an immigration compliance lens and that any Home Office concerns are addressed promptly, fully and strategically.
