If your business employs workers from overseas, it almost certainly holds a sponsor licence and losing that licence is one of the most damaging things that can happen to it. The Home Office can revoke a licence on certain "mandatory" grounds, and it is often assumed that when it does, there is nothing to be done. A High Court decision in September 2026 is a valuable reminder that even a mandatory revocation must be carried out fairly, while also confirming that the duties on sponsors remain unforgiving.
What a sponsor licence is, and why losing it matters
To employ most workers who are not British or Irish, a business needs a sponsor licence and issues each worker a "Certificate of Sponsorship", or CoS. The licence carries strict duties, including keeping records and reporting changes — for example, a change in a sponsored worker's pay or duties. If the Home Office decides a sponsor has breached those duties, it can revoke the licence.
That is a severe step, as the business can no longer employ sponsored staff, and the permission of workers already sponsored is usually cut short, leaving them a short window to find another sponsor or leave the country. For many employers, losing the licence means losing part of the workforce almost overnight.
The assumption about "mandatory" grounds
Some of the apparently automatic grounds on which the Home Office revokes licences are described within its own guidance as mandatory. Faced with such clear language, sponsors often assume that licence revocation is automatic and that, once a breach is spotted, the licence simply goes, with no chance to explain and nothing to challenge.
This assumption was recently tested after a company sponsored three overseas workers, one of whom was paid around £3,650 less than the salary the business had formally declared — although this was not through any wilful attempt to underpay, but rather because he had taken a period of authorised unpaid compassionate leave. However, the business failed to report the change in pay. The Home Office treated this ‘sin of omission’ as a mandatory ground for revocation (“paying a worker less than promised, and failing to report the change”) and revoked the licence.
The High Court, however, quashed that decision. Relying on a mandatory ground, the Court held, does not relieve the Home Office of its common-law duty to act with procedural fairness. Where there was an innocent explanation, and nothing reprehensible in the sponsor's conduct, fairness required that the business be given a chance to explain before its licence was taken away. The Home Office had not done that, and so the revocation could not stand.
The Court was careful to confirm that sponsors' reporting duties remain as stringent as ever. On this occasion, the company won on process, rather than substance. The case in point is not that reporting slips will be forgiven, but rather that a revocation imposed without a fair opportunity to respond can be challenged.
Implications:
For any business that sponsors overseas workers, this ruling ‘cuts both ways’. On the one hand, report changes to pay, duties, and absences promptly and accurately, and keep diligent records to support those reports, as even an innocent or technical breach can prompt the Home Office to move to revoke a sponsor licence. On the other hand, if a licence is revoked without a fair chance to explain, that decision may be open to challenge by judicial review, which is the process for asking a court to overturn an unlawful public-body decision. The time limits for such an intervention are however short, so advice needs to be taken quickly.
With the Home Office stepping up compliance activity across sponsored sectors, more employers than ever are exposed to the risks inherent in such oversights. The safest strategy is rigorous, timely reporting, so such questions of fairness might never arise. However, this judgement does prove that "mandatory" does not exonerate the Home Office from acting unfairly or unreasonably. The main implications of this decision are as follows:
- The Home Office cannot automatically revoke a licence without first giving the employer a fair opportunity to explain an innocent mistake.
- This ruling does not excuse reporting failures; sponsor duties regarding salary tracking, absences, and role changes remain strictly enforced.
- Technical and payroll errors can still legally lead to licence revocation once the employer has been given a fair chance to respond.
- Failing to report a change, even for legitimate reasons like authorised unpaid leave, may be treated as a severe breach.
- Abrupt or unfair Home Office decisions can be challenged in court, but businesses must act immediately due to strict legal time limits.
- With compliance audits on the rise, robust internal HR tracking is vital to prevent administrative oversights.
Disclaimer: This simplified summary of a UK legal case is for general information only. It is not legal advice, may omit important detail, and may not reflect later developments or appeals. Please read the full judgement and seek professional legal advice before acting.