Why a fair disciplinary process matters
When an employee's conduct or performance falls below acceptable standards, a disciplinary procedure is the formal mechanism for addressing it. Done well, it corrects behaviour, protects your business, and treats the employee fairly. Done badly, it exposes you to unfair dismissal claims, compensation uplifts, and reputational damage.
The Acas Code of Practice on Disciplinary and Grievance Procedures sets out the minimum standards that employment tribunals expect. While the Code is not legally binding in itself, tribunals must take it into account when deciding relevant cases. If you fail to follow it, a tribunal can increase any compensation award by up to 25%. That uplift alone makes the Code essential reading for every employer.
This guide walks through the disciplinary process step by step, highlights common mistakes, and explains how to protect your business at every stage.
Step 1: Establish the facts through investigation
Before any formal action, you must investigate the matter thoroughly. This is the foundation of a fair process, and skipping or rushing it is one of the most common mistakes employers make.
The investigation should be proportionate to the seriousness of the allegation. For a minor timekeeping issue, a brief conversation with the employee and a review of attendance records may be sufficient. For a serious allegation such as theft or harassment, a full workplace investigation with witness interviews and evidence gathering is necessary.
Key principles at this stage:
- Appoint an investigator who is impartial and, ideally, not the person who will chair the disciplinary hearing or decide the outcome
- Gather evidence before making any assumptions. Collect relevant documents, emails, CCTV footage, or system records
- Interview witnesses separately and take written notes or statements
- Give the subject of the investigation a chance to explain during the investigation stage, not just at the hearing
- Keep written records of everything. If the case reaches tribunal, the quality of your investigation records will be scrutinised closely
If the allegation is serious enough that the employee cannot remain in the workplace while you investigate, you may suspend them. Suspension must be on full pay, for the shortest time reasonably necessary, and communicated as a neutral act rather than a punishment.
Step 2: Inform the employee in writing
Once the investigation is complete and you have decided there is a case to answer, you must write to the employee informing them of the disciplinary hearing.
The letter must include:
- The specific allegations or concerns, described in enough detail for the employee to understand and prepare a response
- Copies of any evidence you intend to rely on at the hearing, including witness statements and investigation notes
- The date, time, and location of the hearing, with reasonable notice (at least 48 hours, though best practice is five working days)
- The employee's right to be accompanied by a work colleague or trade union representative
- A clear statement that the hearing could result in disciplinary action, specifying the potential outcomes including dismissal if the allegation is serious enough
Vague or incomplete notification letters undermine the entire process. The employee must have a genuine opportunity to prepare their case.
Step 3: Hold the disciplinary hearing
The hearing is the employee's opportunity to hear the case against them and to respond. It must be a genuine, open-minded meeting, not a formality where the decision has already been made.
Who should attend. The hearing should be chaired by a manager with the authority to decide the outcome. The investigator may present the findings but should not make the decision. The employee has a statutory right to be accompanied by a colleague or trade union representative. The companion can address the hearing and confer with the employee but cannot answer questions on the employee's behalf.
How to run the hearing. Present the allegations and the evidence gathered during the investigation. Give the employee a full opportunity to respond, challenge the evidence, call witnesses, and raise any mitigating factors. Ask open questions to explore the employee's account. Take detailed notes throughout, or arrange for a note-taker.
Adjournments. If new information emerges that requires further investigation, or if the employee requests time to consider a point, adjourn the hearing. It is better to delay the outcome than to rush a decision based on incomplete information.
Rescheduling. If the employee or their companion cannot attend on the proposed date, offer an alternative within five working days. If the employee fails to attend without good reason after reasonable efforts to rearrange, you may proceed in their absence, but document your attempts to accommodate them.
Step 4: Decide the appropriate action
After the hearing, take time to consider the evidence carefully. Do not announce your decision at the end of the meeting unless the matter is straightforward. It is better practice to adjourn and confirm the outcome in writing within a few days.
Consider whether the allegation is proven on the balance of probabilities. You do not need the criminal standard of "beyond reasonable doubt," but you do need a genuine and reasonable belief in the employee's misconduct, based on a reasonable investigation. This is the Burchell test.
If the allegation is upheld, the action you take must be proportionate. The standard levels of disciplinary action are:
Verbal warning (or improvement note). For minor first offences. Recorded on the employee's file for a set period, typically six months.
First written warning. For more serious matters, or where a verbal warning has not resulted in improvement. Usually remains on file for 12 months.
Final written warning. For serious misconduct, or where previous warnings have not resolved the issue. Usually remains on file for 12 to 24 months.
Dismissal. With notice for persistent misconduct where previous sanctions have failed, or summary dismissal (without notice) for gross misconduct. Summary dismissal should only follow a thorough investigation and hearing.
When deciding the outcome, consider mitigating factors: length of service, previous disciplinary record, personal circumstances, whether the employee acknowledged their actions, and whether anyone else involved in similar conduct was treated differently. Consistency is critical. If you dismissed one employee for an offence but gave a warning to another for the same thing, you will struggle to defend the harsher decision.
Step 5: Provide the right of appeal
The Acas Code requires you to offer the employee the right to appeal any disciplinary decision. The appeal must be heard by a more senior manager who was not involved in the original decision, where possible.
The appeal letter should be clear about how the employee can appeal, the deadline for doing so (typically five working days), and who will hear the appeal.
The appeal hearing should consider:
- Whether the procedure was followed correctly
- Whether the evidence supported the decision
- Whether the sanction was proportionate
- Any new evidence or information the employee wishes to raise
The appeal outcome can uphold the original decision, reduce the sanction, or overturn it entirely. Confirm the outcome in writing, making clear it is the final stage of the internal process.
Common mistakes SMEs make
Having supported hundreds of businesses through disciplinary processes, we see the same errors repeatedly:
No investigation before the hearing. Managers sometimes go straight from the allegation to the hearing, or treat the hearing itself as the investigation. These are separate stages and must be kept separate.
Decisions made in advance. If the outcome was decided before the hearing took place, the process is fundamentally unfair. Tribunals can detect this, and it is a frequent reason for findings of unfair dismissal. For more detail on what constitutes a fair dismissal, see our guide to dismissing an employee fairly.
Failing to allow accompaniment. Employees have a statutory right to be accompanied at a disciplinary hearing. Denying or obstructing this right is a separate legal claim in itself.
Poor record-keeping. If you cannot produce notes of the investigation, the hearing, and the decision-making process, your position at tribunal is significantly weakened.
Confusing disciplinary and capability processes. Poor performance due to lack of skill or ability is a capability issue, not misconduct. It requires a different approach, focused on support, training, and time to improve. Using a disciplinary process for capability matters can render a subsequent dismissal unfair. Our guide on managing employee performance explains the correct approach.
Not separating investigation and decision roles. Wherever possible, the person who investigates should not be the same person who decides the outcome. In small businesses this is not always practical, but you should try. If the same person must do both, document why and demonstrate that you approached the hearing with an open mind.
Skipping the appeal. Failing to offer an appeal is a breach of the Acas Code and can lead to a 25% uplift on any tribunal award.
When disciplinary action leads to dismissal
If the disciplinary process results in dismissal, follow the correct procedure for ending the employment relationship. Provide written confirmation of the dismissal, the reasons, the effective date, and the right of appeal. Process the final pay, including any accrued but untaken holiday, and issue the P45.
If the relationship has broken down and both parties want a clean exit, a settlement agreement can sometimes offer a better outcome than a contested dismissal.
Linking the disciplinary and grievance processes
It is common for an employee facing disciplinary action to raise a grievance, either about the process itself or about wider workplace issues. The Acas Code says you should consider suspending the disciplinary process while the grievance is investigated if the two are related. If they are not related, both processes can run in parallel, but you must ensure neither is used to undermine the other.
How Rebox HR can help
We support businesses across the UK with every stage of the disciplinary process, from conducting initial investigations to advising on outcomes and representing employers at appeal hearings. Whether you need ongoing retained HR support or one-off guidance through a specific situation via our ad-hoc HR services, we can help you follow a fair process and protect your business.
If you are dealing with a disciplinary matter and want to make sure you handle it correctly, book a free consultation and we will talk you through your options.
