Criminal Offence of Employing Illegal Workers
When does employing illegal workers become a criminal offence? Understand the difference between civil penalties and criminal prosecution.
Last updated: 30 January 2025
Criminal liability is more serious than civil penalties for employing illegal workers.
Civil vs Criminal
Civil Penalty
| Feature | Detail |
|---|---|
| No knowledge needed | Just no excuse |
| Up to £60,000 | Per worker |
| Financial only | No imprisonment |
| More common | Frequent use |
Criminal Offence
| Feature | Detail |
|---|---|
| Knowledge required | Knew or should have |
| Unlimited fine | And/or |
| Up to 5 years | Prison |
| Less common | Serious cases |
The Criminal Offence
Section 21 Immigration Act 2006
| Element | Requirement |
|---|---|
| Employed person | Who had no right |
| Knew | They didn't have right |
| Or reasonable cause | To believe |
| No statutory excuse | In place |
What "Knew" Means
| Knowledge | Detail |
|---|---|
| Actual knowledge | You knew |
| Wilful blindness | Deliberately ignored |
| Turned blind eye | To obvious signs |
| Should have known | Reasonable belief |
When Prosecution Likely
Factors Suggesting Knowledge
| Factor | Indicates |
|---|---|
| Told by worker | Directly informed |
| Obvious signs | Documents fake |
| Paid cash | To avoid records |
| Below minimum wage | Exploitation |
| Previous warnings | From authorities |
Deliberate Avoidance
| Behaviour | Risk |
|---|---|
| Didn't check deliberately | Criminal |
| Ignored warnings | Criminal |
| Destroyed evidence | Criminal |
| Systematic | Multiple workers |
Exploitation
| If Also | Criminal More Likely |
|---|---|
| Underpaying | Workers |
| Poor conditions | Exploitative |
| Control | Of workers |
| Modern slavery | Indicators |
Penalties
For Individuals
| Penalty | Maximum |
|---|---|
| Prison | 5 years |
| Fine | Unlimited |
| Both | Possible |
For Companies
| Penalty | Maximum |
|---|---|
| Fine | Unlimited |
| Reputation | Severe damage |
| Directors | Personal liability |
Personal Liability
| Who | Can Be Prosecuted |
|---|---|
| Directors | If consent/connivance |
| Managers | If responsible |
| Officers | Of company |
| Individuals | Who knew |
Evidence Used
What Prosecution Shows
| Evidence | Purpose |
|---|---|
| Communications | Showing knowledge |
| Documents | Or lack of |
| Witness statements | From workers |
| Financial records | Payment patterns |
Indicators of Knowledge
| Sign | Meaning |
|---|---|
| Cash payments | Avoiding records |
| No contracts | Paper trail |
| Workers' statements | What they said |
| Business records | Inconsistencies |
Defence
Statutory Excuse
| If You Have | Position |
|---|---|
| Did proper check | Strong defence |
| Before employment | Correctly timed |
| Documents correct | On approved list |
| No knowledge | Of illegality |
Genuine Ignorance
| If Truly | Didn't Know |
|---|---|
| Did check | But deceived |
| Fake documents | Very good |
| No red flags | Apparent |
| May avoid | Criminal liability |
What Won't Help
| Not A Defence | Why |
|---|---|
| Didn't know rules | Ignorance of law |
| Too busy | To check |
| Trusted them | Without checking |
| Assumed | Without verifying |
Process
Investigation
| Stage | What Happens |
|---|---|
| Immigration visit | Evidence gathered |
| Interviews | Under caution |
| Documents seized | For review |
| Decision | To prosecute |
Prosecution
| If Prosecuted | Process |
|---|---|
| Crown Court | Usually |
| Trial | If not guilty plea |
| Sentence | If convicted |
| Appeal | Rights exist |
Outcomes
| Verdict | Consequence |
|---|---|
| Guilty | Sentence |
| Not guilty | Acquittal |
| No prosecution | Civil may still apply |
Avoiding Criminal Liability
Proper Systems
| Implement | Benefit |
|---|---|
| RTW checks | For everyone |
| Before starting | Properly timed |
| Correct documents | Accepted |
| Records kept | Evidence |
Training
| Ensure | Staff Know |
|---|---|
| How to check | Process |
| What to look for | Red flags |
| When to escalate | Concerns |
| Why important | Consequences |
Red Flag Response
| If Concerns | Action |
|---|---|
| Don't ignore | Investigate |
| Document | Your actions |
| Seek advice | If unsure |
| Don't employ | If doubts |
Related Offences
For Workers
| Offence | Detail |
|---|---|
| Working illegally | Criminal for them |
| Using false documents | Fraud |
| Up to 51 weeks | Prison |
Modern Slavery
| If Also | Present |
|---|---|
| Trafficking | Separate offence |
| Forced labour | Criminal |
| Exploitation | Severe penalties |
Document Fraud
| Offence | Penalty |
|---|---|
| False documents | Serious |
| Identity fraud | Prosecution |
| Forgery | Criminal |
For Directors and Managers
Personal Exposure
| Risk | When |
|---|---|
| Personal prosecution | If consented |
| Or connived | In offence |
| Or neglected | To prevent |
| Directors' duties | Apply |
Due Diligence
| Protection | Method |
|---|---|
| Systems in place | Documented |
| Oversight | Active |
| Training | Provided |
| Monitoring | Regular |
Reporting Obligations
If Discover Illegal Worker
| Consider | Reporting |
|---|---|
| May help | Mitigation |
| Shows cooperation | Good faith |
| Doesn't guarantee | No action |
| Seek advice | First |
Whistleblowing
| Protection | For |
|---|---|
| Employees | Who report |
| Cannot be | Victimised |
| Confidential | Report possible |
Summary
Key Differences
| Civil | Criminal |
|---|---|
| No knowledge needed | Knowledge required |
| £60,000 max | Unlimited fine |
| Financial only | Prison possible |
| Common | Serious cases |
Protection
| Action | Benefit |
|---|---|
| Proper checks | Defence |
| Good records | Evidence |
| No knowledge | Key factor |
| Cooperation | Mitigation |
Related answers
Civil Penalty for Illegal Working
What are the penalties for employing illegal workers? Understand civil penalties, how to avoid them, and what to do if you receive one.
Preventing Illegal Working: Employer's Guide
Civil penalties for illegal working. How to establish a statutory excuse, avoid fines, and handle Home Office enforcement visits.
Right to Work Checks: UK Employer Guide
UK employers must verify every employee's right to work before they start. Learn the 3 methods, required documents, and penalties for non-compliance.
Frequently Asked Questions
- When is employing an illegal worker a criminal offence?
- It becomes criminal when you knew, or had reasonable cause to believe, that the employee didn't have the right to work. Mere negligence typically leads to civil penalties, but knowledge or wilful blindness can result in prosecution.
- What are the penalties for the criminal offence?
- The criminal offence carries an unlimited fine and up to 5 years' imprisonment. Directors and managers can be personally prosecuted if the offence was committed with their consent or connivance.
- What's the difference between civil penalty and criminal offence?
- Civil penalties (up to £60,000) require no proof of knowledge - just that you employed someone without right to work and didn't have a statutory excuse. Criminal prosecution requires proof that you knew or should have known the person was illegal.