Gross Misconduct vs Ordinary Misconduct Dismissal
Understanding the distinction between gross misconduct (which may justify summary dismissal without notice) and ordinary misconduct (which requires a warning-based disciplinary process and notice), and the procedural requirements for each under the ACAS Code of Practice.
Overview
When an employer dismisses an employee for misconduct, the legal treatment depends critically on whether the conduct amounts to gross misconduct or ordinary (or 'general') misconduct. The distinction determines whether the employer can dismiss without notice (summary dismissal) and without going through a full warning process — and it affects the fairness of the dismissal for the purposes of the Employment Rights Act 1996 (ERA 1996) s.98. Ordinary misconduct — lateness, minor rule breaches, low-level insubordination — requires the employer to follow a stepped process: typically a verbal or written warning, a final written warning, and only then dismissal (with notice). Gross misconduct — theft, fraud, violence, serious breach of health and safety, or fundamental breach of trust — may justify immediate summary dismissal without notice. However, even for gross misconduct, the ACAS Code of Practice on Disciplinary and Grievance Procedures (2015) requires a fair investigation, an opportunity to be heard, and the right to be accompanied. Dismissal without any process risks an unfair dismissal finding even where the conduct was genuinely gross.
Side-by-Side Comparison
Gross Misconduct
Pros
- Justifies summary dismissal — the employer does not have to pay notice or go through a full warning process
- A genuine finding of gross misconduct may also support withholding contractual benefits (e.g. garden leave, bonuses) in some cases
- Deters serious misconduct — clear gross misconduct policies communicate expectations to all employees
- Enforceable — courts and Tribunals accept summary dismissal for genuine gross misconduct, provided fair procedure was followed
Cons
- Even gross misconduct requires a fair investigation, notification of charges, a hearing, and the right to appeal (ACAS Code paras. 5–27)
- Failure to follow a fair procedure makes the dismissal unfair even if the conduct was genuinely gross — Polkey v AE Dayton Services [1987] AC 344
- Labelling something 'gross misconduct' in the policy does not make it so — the Tribunal assesses whether the conduct falls within the band of reasonable responses
- Summary dismissal may itself amount to a breach of contract if the conduct does not in fact justify it — entitling the employee to sue for wrongful dismissal
Best For
Cases of clear, serious, single-incident misconduct (fraud, violence, theft) where the facts are established after investigation and the employer's disciplinary policy identifies the conduct as gross misconduct.
Ordinary Misconduct
Pros
- Graduated approach gives the employee a fair chance to improve — consistent with both the ACAS Code and the ERA 1996 s.98(4) reasonableness test
- Reduces Tribunal risk — following the warning process properly is strong evidence of a fair and reasonable procedure
- Employee is entitled to notice and pay — fewer disputes about wrongful dismissal
- Warnings can be relied upon later (within their active period) if conduct does not improve
Cons
- Process takes time — multiple stages of warning before dismissal is lawful
- Warnings lapse after a set period (typically 6–12 months for written, 12–24 for final written) — employer must keep records carefully
- Employee retains employment and continues to accrue rights and benefits during the warning period
- Risk of discrimination or whistleblowing claims if the disciplinary process is perceived as targeted
Best For
Persistent but lower-level misconduct such as recurring lateness, attendance issues, and minor insubordination — where the employer's aim is to correct behaviour, not immediately end the relationship.
Key Differences
Our Recommendation
Employers must distinguish clearly between gross and ordinary misconduct in their disciplinary policies, and must apply the ACAS Code of Practice in every disciplinary situation. Even where gross misconduct is alleged, a thorough investigation, a disciplinary hearing, and a right of appeal are non-negotiable — failure to follow these steps will almost certainly result in a finding of procedural unfairness. Employees facing disciplinary action should check whether their employer's policy categorises the alleged conduct as gross misconduct, request copies of all documents relied upon, and exercise their right to be accompanied under ERA 1996 s.10.