Gross misconduct

A label employers reach for to justify dismissal without notice — and one a tribunal will look behind rather than take at face value.

What kinds of behaviour count as gross misconduct?

There is no statutory list. Employers commonly name theft, fraud, violence, serious health and safety breaches, serious insubordination, and deliberate damage to property in their disciplinary policies. What matters legally is not whether the behaviour appears on a list but whether it was serious enough, in the circumstances, to fundamentally breach the employment relationship — and whether the employer genuinely believed on reasonable grounds that the employee did it.

Does being dismissed for gross misconduct mean I lose my notice pay?

If the gross misconduct is established, the employer is entitled to dismiss summarily — without notice or pay in lieu. If it is not established, dismissal without notice is a breach of contract, and a wrongful dismissal claim for the notice pay can succeed even where an unfair dismissal claim does not. The two claims ask different questions and can produce different answers on the same facts.

Can a dismissal for genuine gross misconduct still be unfair?

Yes, and this is the point most often missed. Section 98 requires the employer to have a potentially fair reason and to have acted reasonably in treating it as sufficient. An employer who skipped the investigation, denied the employee a hearing, refused an appeal, or predetermined the outcome can lose an unfair dismissal claim even where the underlying conduct occurred. Compensation may then be reduced for contributory fault or on Polkey grounds.

Do I have a right to be accompanied at a disciplinary hearing?

Yes. Under section 10 of the Employment Relations Act 1999, a worker facing a disciplinary hearing that could result in a formal warning or dismissal has a statutory right to be accompanied by a trade union representative or a fellow worker, on making a reasonable request. Refusing that request is a breach in itself and is also a process failing a tribunal will note.

What is the Acas uplift?

Where an employer unreasonably fails to follow the Acas Code of Practice, a tribunal can increase compensation by up to 25 per cent. The reverse also applies: an employee who unreasonably fails to follow the Code can see an award reduced by up to 25 per cent. It applies to most tribunal claims listed in Schedule A2 to the Trade Union and Labour Relations (Consolidation) Act 1992.

Does it matter that I had years of clean service?

It can. Length of service and a clean disciplinary record are part of the circumstances a reasonable employer weighs when deciding whether dismissal, as opposed to a lesser sanction, falls within the band of reasonable responses. They do not make a genuinely gross act forgivable, but a tribunal will look at whether the employer considered them at all.

Employment Tribunal · Glossary

A label employers reach for to justify dismissal without notice — and one a tribunal will look behind rather than take at face value.

Last reviewed: August 2026

Employment Tribunal track

is conduct serious enough to destroy the trust and confidence at the heart of the employment relationship, entitling an employer to dismiss without notice — if, and only if, the conduct is made out and the process was fair.

Where this comes from

Employment Rights Act 1996, s.98

— the potentially fair reasons for dismissal, including conduct.

Acas Code of Practice

— the disciplinary standard tribunals measure process against.

British Home Stores v Burchell [1978]

— the three-stage test for conduct dismissals.

— gov.uk guidance on lawful dismissal.

The label is not the test

Employers use “gross misconduct” because of what it permits: dismissal without notice, and without pay in lieu of notice. That is a real contractual consequence, and it is why the phrase appears in almost every disciplinary policy alongside a list of examples.

But an employment tribunal does not decide a case by checking whether the alleged behaviour appears on the employer's list. Under section 98 of the Employment Rights Act 1996, the employer must show a potentially fair reason for dismissal — conduct is one — and the tribunal then decides whether the employer acted reasonably in treating that reason as sufficient, having regard to the size and administrative resources of the business and to equity and the substantial merits of the case.

That second stage is where most conduct dismissals are won and lost. An employer with a genuine belief in serious misconduct, arrived at through a fair process, will usually be within the band of reasonable responses. An employer who reached the same conclusion by skipping steps often will not, even if the employee did what was alleged.

What a tribunal examines

• Was conduct the real reason?
• The employer must show the reason it relied on, and that it was the operative reason for dismissal rather than a cover for something else.
• Did the employer genuinely believe it?
• The first limb of the
• : an honest belief in the employee's guilt.
• Were there reasonable grounds for that belief?
• The second limb. The belief must rest on something, not on assumption or a single unchallenged account.
• Was the investigation reasonable?
• The third limb. Proportionate to the seriousness of the allegation and to the consequences for the employee.
• Was the process fair?
• Notice of the allegations, sight of the evidence, a hearing, the right to be accompanied, an unbiased decision-maker, and a right of appeal.
• Was dismissal within the band of reasonable responses?
• Not whether the tribunal would have dismissed, but whether a reasonable employer could have.

Where a strong case falls down on process

A warehouse supervisor with eleven years' service is accused of falsifying stock records. CCTV and system logs point clearly at him. The employer suspends him on Monday, holds a disciplinary hearing on Wednesday without sending him the CCTV stills or the log extracts beforehand, refuses his request to be accompanied by a colleague on the basis that it would delay matters, and dismisses him the same afternoon. There is no appeal offered.

At the tribunal the employer establishes a genuine belief on reasonable grounds after what was, on the evidence, a reasonable investigation. The conduct itself is not seriously in doubt. But the process fails on three counts: the evidence was not disclosed in advance, the statutory right to be accompanied was denied, and no appeal was offered — each a departure from the Acas Code.

The tribunal finds the dismissal unfair. Compensation, however, is heavily affected: a Polkey reduction reflects the likelihood that a fair process would have produced the same outcome, and a contributory fault reduction reflects the employee's own conduct. The Acas uplift for the Code breaches pushes in the other direction. The result is a finding of unfairness with a modest award — which is often exactly what a process-only case looks like.

What this means if you are the employee

The instinct after a gross misconduct dismissal is to focus on proving you did not do it. That is sometimes the right focus, but it is rarely the whole of it, because the tribunal is not deciding whether you did it — it is deciding whether the employer was reasonable to believe you did and reasonable to dismiss you for it.

So the questions worth asking are procedural as much as factual. Were you told, in writing and in advance, exactly what you were accused of? Were you given the evidence before the hearing, or shown it for the first time in the room? Were you told you could be accompanied? Was the person who investigated also the person who decided? Was an appeal offered, and was it heard by someone more senior and uninvolved? Was a lesser sanction considered at all?

Gather the documents that answer those questions while you still have access to them: the invitation letter, the evidence pack, the minutes, the outcome letter, the appeal correspondence, the disciplinary policy, and any comparable cases you know of where someone else was treated differently. A dismissal that looks unanswerable on the facts can still be unfair on the paper trail.

Two further points on remedy. First, a

claim for unpaid notice is a separate question turning on whether the conduct was actually gross, not on process, and it can succeed independently. Second, compensation for unfair dismissal can be reduced for

grounds, so a win on process does not necessarily produce a large award. Being clear-eyed about that from the outset makes for better decisions about settlement.

• Assuming the employer's list settles it.
• A policy calling something gross misconduct does not make dismissal for it automatically fair.
• Fighting only on the facts.
• Process failings are frequently the stronger ground, and they are documentary rather than contested.
• Not appealing internally.
• An unused right of appeal weakens the case and can affect compensation. Use it, in writing, within the time given.
• Leaving without the paperwork.
• Request the evidence pack, minutes and policy while the process is live. Access disappears the moment employment ends.
• Missing the tribunal deadline.
• Most claims currently run three months less one day from the dismissal, paused by Acas early conciliation. From 1 October 2026 that extends to six months, but only for acts occurring on or after that date.
• Expecting the full loss.
• Polkey and contributory fault reductions can substantially cut an award even where the dismissal is found unfair.

Frequently asked questions

Sources & further reading

• Employment Rights Act 1996, s.98
• (legislation.gov.uk)
• Employment Relations Act 1999, s.10 — right to be accompanied
• Acas Code of Practice on disciplinary and grievance procedures
• Employment Tribunal (Extension of Time Limits) Regulations 2026

Dismissed for gross misconduct?

Start My Claim helps you test the process against the Acas Code and build your tribunal claim yourself.

Last reviewed: August 2026.

References checked against s.98 Employment Rights Act 1996 and the Acas Code of Practice as in force on 17 August 2026. Tribunal time limits extend from three to six months on 1 October 2026 for acts occurring on or after that date.

This page is explanatory only and is not legal advice. Start My Claim is self-service software, not a law firm — its tools help you build and run your own case.