A Disciplinary Hearing Invitation Letter is the formal written notice by which an employer in England and Wales invites an employee to attend a disciplinary hearing. It is one of the most procedurally significant documents in the entire employment disciplinary process, because its adequacy — or inadequacy — can determine whether any subsequent disciplinary action, including dismissal, is fair or unfair under the Employment Rights Act 1996.

The ACAS Code of Practice on Disciplinary and Grievance Procedures 2015 sets out the minimum procedural requirements that employers must follow before taking formal disciplinary action. The Code requires that, before a disciplinary hearing, the employer must carry out a reasonable investigation, put the allegations to the employee in writing, and provide the employee with copies of all evidence to be relied upon at the hearing. The invitation letter is the vehicle through which these obligations are fulfilled.

The letter must set out the specific allegations against the employee with sufficient precision to allow the employee to understand the case they have to answer and to prepare their response. Vague or generalised descriptions of alleged misconduct — such as stating only that the employee has demonstrated poor conduct — are a frequent cause of Employment Tribunal findings of procedural unfairness. The allegation should identify the specific act or omission, the date or dates on which it occurred, the company policy or rule that was allegedly breached, and any context relevant to the seriousness of the matter.

Equally important is the requirement to inform the employee of their statutory right to be accompanied at the hearing by a trade union representative or a fellow worker, as provided by Section 10 of the Employment Relations Act 1999. The letter must also set out the possible outcomes of the hearing — including, where applicable, the possibility of dismissal — so that the employee fully understands the potential consequences and can prepare accordingly. Failure to state that dismissal is a possible outcome, where it in fact is, has been found by Employment Tribunals to be a significant procedural failing.

The disciplinary hearing invitation letter also serves an important evidential purpose. In any subsequent Employment Tribunal proceedings, the Tribunal will examine the invitation letter closely as part of its assessment of whether the employer followed a fair procedure. A well-drafted letter demonstrates that the employer took the disciplinary process seriously, acted in good faith, and complied with the ACAS Code — all of which are factors in the reasonableness assessment under Section 98(4) of the Employment Rights Act 1996.

A disciplinary hearing invitation letter is needed whenever an employer in England and Wales has completed an investigation into alleged misconduct or poor performance and has decided that the matter is sufficiently serious to warrant a formal disciplinary hearing. The letter marks the transition from the investigation stage to the hearing stage and must be issued before the hearing takes place.

The most common situations in which a disciplinary hearing invitation is required include: allegations of misconduct such as unauthorised absence, insubordination, failure to follow a management instruction, misuse of company property, or breach of the company's code of conduct; allegations of gross misconduct such as theft, fraud, violence, serious harassment, deliberate damage, or bringing the employer into serious disrepute; and persistent underperformance or failure to meet agreed targets despite prior informal or formal warnings.

The ACAS Code of Practice requires the letter to be sent in sufficient time before the hearing to give the employee a reasonable opportunity to prepare their case. While no specific minimum notice period is prescribed by the Code, five working days is generally considered to be the minimum for a straightforward misconduct hearing. For more serious or complex allegations — particularly those involving extensive documentation, multiple witnesses, or allegations of gross misconduct that could result in summary dismissal — a longer notice period may be appropriate.

The letter must be accompanied by copies of all evidence the employer intends to rely upon at the hearing. This includes investigation notes, witness statements, CCTV footage summaries, attendance records, email correspondence, and any previous warnings or relevant documents from the employee's personnel file. Failure to disclose evidence before the hearing is a procedural failing under the ACAS Code that can undermine the fairness of the process.

An invitation letter is also required where an employee has been suspended pending investigation and the investigation has now been completed. In such cases, the letter should be sent promptly, as prolonged suspension without a hearing date may itself give rise to a claim of breach of trust and confidence. The letter should confirm the hearing arrangements and, where appropriate, confirm that the suspension will remain in place until the hearing has been concluded.

A procedurally compliant disciplinary hearing invitation letter for use in England and Wales must contain several essential elements that together demonstrate adherence to the ACAS Code of Practice 2015 and protect the employer's legal position in any subsequent Employment Tribunal proceedings.

First, the letter must clearly identify the employer, including the full registered name and address of the employing organisation, and the HR contact or senior manager who is responsible for the disciplinary process. It must also identify the employee by full name and, where appropriate, provide their home address — particularly where the employee has been suspended from the workplace and the letter needs to be delivered to their home.

Second, the allegations must be set out in full and with specificity. The ACAS Code requires the employer to put the allegations to the employee in writing before the hearing. Each allegation should identify the specific conduct or omission, the date or dates on which it occurred, the company policy or contractual term allegedly breached, and the category of the allegation (misconduct, gross misconduct, or poor performance). General statements such as poor attitude or unacceptable behaviour are insufficient and will be scrutinised by Employment Tribunals.

Third, the hearing details must be clearly stated: the date, time, and location of the hearing, and the names and roles of the individuals who will constitute the hearing panel. The ACAS Code recommends that the hearing be chaired by a manager who has not been involved in the investigation, to ensure impartiality.

Fourth, the letter must inform the employee of the range of possible outcomes. This is a key procedural requirement because the employee must understand the seriousness of the proceedings and the potential consequences. Where summary dismissal for gross misconduct is a possibility, this must be stated explicitly.

Fifth, the employee's statutory right to be accompanied must be clearly set out. Under Section 10 of the Employment Relations Act 1999, every worker has the right to be accompanied at a disciplinary hearing by a trade union representative or a fellow worker. The companion may address the hearing, confer with the worker, and sum up their case, but may not answer questions on the worker's behalf.

Sixth, all evidence to be relied upon by the employer must be enclosed with the letter or listed and provided separately. This includes investigation reports, witness statements, documents, and any other material the employer intends to present at the hearing. The employee should also be invited to submit their own evidence and witness details before the hearing.

Finally, the letter should set a clear response deadline by which the employee must confirm their attendance, identify their companion, and provide any documents or witnesses they intend to rely upon. The letter should also explain what will happen if the employee fails to attend, noting that under the ACAS Code, the employer may in some circumstances proceed in the employee's absence.