Illegal Worker Fines UK: How Much Could a Missed Check Cost Your Business?
A restaurant in Birmingham. Three kitchen staff whose visas expired six months ago. The owner checked their documents at hire but never did a follow-up. The Home Office visits. The bill: up to £135,000 in civil penalties — for a first offence.
That scenario plays out across the UK every week. Since penalty rates increased in February 2024, the financial risk for small employers has tripled. Here's exactly what the penalties are, what triggers them, and how to avoid them.
This guide is for informational purposes only and does not constitute legal advice. For advice on your specific situation, consult a qualified immigration solicitor.
Current penalty rates
Under the civil penalty scheme in Section 15 of the Immigration, Asylum and Nationality Act 2006, the Home Office Code of practice sets these penalty levels. Its calculation only ever reduces them, so each is the most a single worker can cost:
| Offence type | Maximum per worker | Example: 3 workers |
|---|---|---|
| First breach | £45,000 | £135,000 |
| Repeat breach (within 3 years) | £60,000 | £180,000 |
These rates took effect on 13 February 2024, when the previous Code of practice came into force, tripling the previous maximums of £15,000 (first) and £20,000 (repeat); the Code in force since 1 October 2026 keeps them. The Home Office penalties page gives the ceiling: a civil penalty "of up to £60,000 for each illegal worker". For a step-by-step breakdown of how the penalty is calculated — the starting figure, the mitigation reductions, and the fast-payment discount — see our dedicated civil penalty guide.
The penalties apply per illegal worker, not per business. Each non-compliant employee is a separate penalty. For a micro-employer with thin margins, even one penalty can be existential.
What triggers a civil penalty
You can be fined if you employ someone who does not have the right to work in the UK and you cannot demonstrate that you conducted the prescribed right to work checks correctly. The most common triggers for small employers:
Missed follow-up checks. You checked documents at hire, but the employee's visa expired and you didn't re-check. Your statutory excuse expired with the visa. This is one of the most common triggers for small employers — see our guide to ongoing compliance for how follow-up checks work.
Incomplete initial checks. You checked a document but didn't keep a dated copy, or you checked the wrong document (a driving licence doesn't prove right to work, for example).
No check at all. You hired someone without conducting any right to work check. This eliminates any possible statutory excuse.
Expired 28-day grace period. An employee's permission expired, you knew they had a pending application, but you didn't contact the Employer Checking Service within 28 days.
The statutory excuse: your only defence
The statutory excuse is the mechanism that protects employers from civil penalties. It works simply: if you conducted the prescribed checks at the right times and kept proper records, you have a statutory excuse — and you won't be fined, even if it turns out the employee didn't actually have the right to work.
The Code of practice on preventing illegal working sets out exactly what checks maintain your excuse. The critical point: for employees with time-limited permission (List B documents), your statutory excuse has an expiry date. Miss the follow-up check, and the excuse disappears.
Penalty reductions
The full penalty is a maximum. The Home Office can reduce the amount based on mitigating factors:
- £5,000 reduction for reporting your suspicion to the Home Office, and getting a Unique Reference Number, before the Home Office identifies the worker
- £5,000 reduction for actively co-operating with the Home Office investigation — including answering its requests for information "within deadlines specified"
- Reduction to a Warning Notice (£0) if you can show effective right to work checking practices together with the first two factors — and only on a first breach. This is not a fixed monetary discount: the Code says that in that case the employer's "civil penalty will be reduced to the minimum level of a Warning Notice (first breach only)."
- 30% fast-payment discount if the (potentially reduced) penalty is paid within 21 days of the notice — but the Code restricts this to "employers in receipt of their first penalty" and it "cannot be paid in instalments"
So the maximum monetary reduction is £10,000 per worker (reporting + co-operation). There is no third £5,000 discount for partial compliance — the third factor is either a Warning Notice or nothing, and it turns on your checks being effective, not merely present.
Even with reductions, a first-offence penalty for one worker starts at a substantial figure. And reductions require active cooperation — they're not automatic.
Criminal penalties
Civil penalties are the financial risk. Criminal prosecution is the more serious risk. If the Home Office believes you knowingly employed someone without the right to work, the consequences escalate:
- Up to 5 years' imprisonment
- Unlimited fine
- Both can apply simultaneously
The "knowingly" threshold is important. If you had reason to believe a document was false, or you were aware a visa had expired but continued employing the person, you may face criminal charges rather than just a civil penalty.
Additional consequences
Beyond the financial penalty itself, additional consequences can include:
- Naming and shaming. The Home Office can publicly identify businesses that employ illegal workers as a deterrent.
- Sponsor licence revocation. If you hold a sponsor licence, a penalty can lead to revocation — meaning you can no longer employ sponsored workers at all.
- Insurance and lending impact. A published penalty may affect business insurance premiums and lending decisions.
- Closure of the premises. Where an employer (or a connected person) has a relevant history of illegal working, an immigration officer of at least chief immigration officer rank can issue an illegal working closure notice in respect of the premises, and a court can then make an illegal working compliance order. These powers sit in section 38 of, and Schedule 6 to, the Immigration Act 2016 — not in the Code of Practice.
What this means for micro-employers
For a business with 5-15 employees, the maths is straightforward:
| Visa-holding staff | First offence exposure | Repeat exposure |
|---|---|---|
| 1 | Up to £45,000 | Up to £60,000 |
| 3 | Up to £135,000 | Up to £180,000 |
| 5 | Up to £225,000 | Up to £300,000 |
These figures represent the maximum. Actual penalties depend on which mitigating factors apply — the Code's calculation only ever reduces the figure. But even a significantly reduced penalty — say, £20,000 — can be enough to close a small business.
The sectors most at risk are those with the highest proportion of visa-holding workers: hospitality, social care, cleaning, agriculture, and construction. These are also the sectors with the smallest compliance budgets and the lowest awareness of follow-up obligations.
Count the exposure across your whole labour supply, not just your payroll. Since 1 October 2026 the class of engager who can be issued one of these penalties has been wider — see who becomes liable from 1 October 2026 — and in sub-contracted work penalties can reach up the contract chain to a business that never contracted with the worker at all. For the new categories the guidance limits penalties to engagements "commenced on or after 1 October 2026", so the exposure builds from that date rather than applying to arrangements already running.
Try our penalty risk calculator to estimate the specific financial exposure for your business based on your team composition.
How to protect your business
For a step-by-step process, use our right to work checklist template.
- Conduct right to work checks on every hire — including British citizens. Checking only foreign nationals is discriminatory.
- Keep dated copies of every document you check. Digital copies are acceptable.
- Track visa expiry dates and set reminders well before they expire.
- Run follow-up checks before permissions expire — not after.
- Act within 28 days if an employee's right to work expires and they have a pending application.
- Review your employee register monthly — 10 minutes a month prevents a five-figure fine.
Better still, audit your own records before the Home Office does — a self-audit finds the gaps while you can still fix them. And if a first breach has already happened, understand how repeat offences trigger the £60,000 maximum penalty before the second one lands.
For the full compliance process, see our guide to ongoing RTW compliance.
Sources
- Penalties for employing illegal workers — GOV.UK
- Code of practice on preventing illegal working: Right to Work Scheme for employers — GOV.UK (the revised Code brought into force on 1 October 2026 by SI 2026/700; it applies to breaches on or after that date)
- Code of practice on preventing illegal working (13 February 2024) — UK Government Web Archive (the previous Code, which raised the penalties in February 2024 and sets the penalty amount for breaches from 13 February 2024 to 30 September 2026)
- Immigration, Asylum and Nationality Act 2006, Section 15 — legislation.gov.uk
- Illegal working civil penalties: an employer's guide — GOV.UK
- Immigration Act 2016, Section 38 and Schedule 6 (illegal working closure notices and compliance orders) — legislation.gov.uk
- Employer's guide to right to work checks (1 October 2026) — GOV.UK (the final version, published on GOV.UK on 1 October 2026 in place of the 11 September 2026 draft; it states that it came into force on 1 October 2026 — the source of this article's 1 October 2026 scope and commencement points)