By May Cheung and Annabel Mace
Brightmine editor: Lilia Dangi
Employers have legal responsibilities under UK immigration law to prevent illegal working, including checking an individual’s right to work, carrying out follow‑up checks where required, and complying with related statutory requirements. For instance:
- It is a criminal offence for an employer knowingly to employ an individual who does not have permission to work in the UK, or whom it has reasonable cause to believe does not have permission to work in the UK.
- By carrying out right to work checks, and follow-up checks where required, employers may have a defence against liability for employing a migrant worker illegally.
- Employers must check specified documents or use the Home Office online right to work service for evidence of an individual’s right to work in the UK.
- Employers that employ foreign workers illegally may be liable for civil and criminal penalties.
- Employers must reconcile the requirements in the immigration legislation not to employ workers illegally with the provisions on race discrimination in the Equality Act 2010.
- Certain individuals do not need to be sponsored to work in the UK.
- There is a merit-based points system for foreign nationals wishing to work in the UK.
- The skilled worker and global business mobility routes of the points-based system enable employers to employ skilled workers from overseas.
- Employers must obtain a sponsor licence to be able to sponsor migrants unde
In this guide, learn about:
- Avoiding illegal working
- Checking documents following a TUPE transfer
- Offence of illegal working
- Penalties
- Guidance for employers
- List of specified documents
- Employees who commenced employment prior to 29 February 2008
- Asylum seekers and refugees
- Avoiding race discrimination
- Reconciling right to work checks against the duty not to discriminate
- Individuals who can be employed in the UK without sponsorship
- EEA and Swiss nationals
- EU settlement scheme
- Points-based immigration system
- Skilled worker route
- Temporary Shortage List
- Minimum salary thresholds
- Health and care visa
- Global business mobility routes
- Global business mobility – senior or specialist worker
- Immigration skills charge
- Requirement to provide criminal records certificates
- Sponsorship licences and certificates
- Certificates of sponsorship and visa applications
- Change of employer
- Immigration Salary List
- Checking qualifications
- Recruiting via agencies
- Employment agencies advertising outside Great Britain
- Scale-up route
- Global talent route
- Innovator Founder visas
- Temporary workers
- Youth mobility scheme
- Business visitors
- Electronic Travel Authorisation (ETA)
- Graduate sponsorship route
- Graduate immigration route
- International students
- Supplementary employment
- Immigration health surcharge
- Data protection
- Public-sector language requirements
- Future developments
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About the author

Lilia Dangi
Legal Editor, Brightmine
Lilia joined the Employment Law and Compliance team as a Legal Editor in March 2025.
Lilia has over 10 years’ experience in HR, with a strong background in employment law, compliance, and governance. She has worked across major organisations including Deloitte, Santander, and Unilever, advising on complex employee relations matters, immigration and change management.
Lilia also brings experience as a CIPD tutor, delivering modules on employment law and workforce planning. She holds a Law degree, a Law Masters in Corporate Governance, and is a certified Company Secretary and CIPD Associate.
Connect with Lilia on LinkedIn.
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