Disciplinary Investigations
How To Investigate a Potential Disciplinary Matter
A disciplinary investigation is a structured fact-finding process carried out when concerns about an employee’s conduct or behaviour arise. Its purpose is to establish the facts, gather relevant evidence and decide whether there is a disciplinary case to answer.
It is an essential part of a fair disciplinary procedure and sits before any formal disciplinary meeting. Employers are expected to approach investigations with an open mind, considering evidence that both supports and contradicts any allegation.
The thoroughness of an investigation will depend on the nature and seriousness of the issue, but it should always be conducted fairly, promptly and objectively in line with the ACAS Code of Practice.
Importantly, disciplinary investigations do not always result in formal action. Once the investigation is complete, outcomes may range from no case to answer, through to informal management action, or escalation to a formal disciplinary meeting where appropriate.
What Is A Disciplinary Investigation?
A disciplinary investigation is a fact-finding exercise carried out before an employer decides whether formal disciplinary action may be necessary. Its purpose is to establish the facts, gather relevant evidence and determine whether there is a disciplinary case to answer.
The investigation stage is one of the most important parts of the disciplinary process. Decisions made at this stage can have a significant impact on the fairness of any subsequent disciplinary action and may be closely scrutinised by an Employment Tribunal if a dispute later arises.
Importantly, a disciplinary investigation is not a disciplinary meeting. The role of the investigator is not to decide whether the employee is guilty of misconduct. Instead, their role is to collect evidence objectively, establish what happened and present their findings to the manager responsible for deciding what action, if any, should be taken.
Depending on the circumstances, a disciplinary investigation may involve:
- Interviewing the employee concerned;
- Obtaining witness statements;
- Reviewing emails, documents or other records;
- Examining CCTV footage or electronic data;
- Reviewing relevant workplace policies and procedures; and
- Considering any mitigating circumstances.
Throughout the investigation, employers should keep an open mind and consider evidence that supports the employee’s explanation as well as evidence that supports the allegation. A fair investigation is not about building a case against an employee; it is about establishing the facts and reaching an informed decision about the next steps.
At the conclusion of the investigation, the employer should be in a position to decide whether there is no case to answer, whether informal action would be more appropriate or whether the matter should proceed to a formal disciplinary meeting.
Your Disciplinary Policy
Before starting any disciplinary investigation, employers should ensure they have a clear and legally compliant Disciplinary Policy in place. The policy should explain the standards of conduct expected from employees, the procedures that will be followed when concerns arise and the potential consequences of misconduct.
A well-written disciplinary policy protects both the employer and the employee. It helps managers deal with issues consistently and ensures employees understand the rules, expectations and processes that apply within the organisation.
If employees are unaware of a workplace rule or policy, it may be difficult for an employer to justify disciplinary action based on an alleged breach. Similarly, where managers fail to follow the organisation’s own procedures, disciplinary action may be challenged as unfair.
The ACAS Code of Practice recommends that employers establish clear disciplinary procedures and communicate them to employees. One of the most effective ways of achieving this is to include your disciplinary policy within an Employee Handbook, ensuring all employees have access to the same information and expectations.
Who Should Investigate a Potential Disciplinary Matter?
One of the first and most important decisions in any disciplinary process is identifying the right person to carry out the investigation. Getting this wrong can undermine the fairness of the entire process and increase the risk of any subsequent disciplinary action being challenged.
To ensure a fair and impartial process, the investigating officer should not normally be the employee’s direct line manager or anyone directly involved in the incident or allegations.
In addition, good practice and the principles of natural justice mean that the person carrying out the investigation should not also be the decision-maker at the disciplinary meeting or the appeal stage. Separating these roles helps ensure objectivity at each stage and strengthens the integrity of the process.
In smaller organisations, it is not always possible to have entirely separate individuals at every stage. However, employers should still make reasonable efforts to ensure independence and avoid conflicts of interest wherever possible.
Before commencing an investigation, employers should consider the full disciplinary process and ensure that appropriate individuals are available to undertake each stage fairly and without bias.
Typically, employers will need different individuals to:
- Carry out the investigation;
- Chair the disciplinary meeting; and
- Hear any appeal.
Each of these roles should be allocated to individuals who are impartial, have had no prior involvement in the matter and are able to make decisions based solely on the evidence presented.
How To Investigate a Potential Disciplinary Matter
A disciplinary investigation is a structured fact-finding process designed to establish what has happened, gather relevant evidence and determine whether there is a disciplinary case to answer. It is not about proving guilt, but about reaching an informed and objective view of the facts.
Initial Fact-Finding
When an issue arises, the first step is to carry out initial fact-finding to understand the nature and seriousness of the concern. This may involve reviewing basic information such as incident reports, management observations, complaints or other available evidence.
At this stage, the aim is to decide whether the matter requires a formal investigation or whether it can be resolved informally.
Planning the Investigation
If a formal investigation is required, the investigator should define the scope of the investigation and identify what evidence needs to be gathered. This may include documents, electronic records, CCTV footage or witness accounts.
It is also important to identify relevant witnesses and consider any policies or procedures that may be relevant to the case.
The employee should be informed that an investigation is taking place, along with the general nature of the concerns being reviewed. This ensures transparency without prejudging the outcome.
Suspension During an Investigation
In some cases of serious misconduct, it may be appropriate to suspend the employee on full pay while the investigation takes place. Suspension should always be treated as a precautionary measure and not a disciplinary sanction.
Where suspension is necessary, employers should also take steps to protect evidence and ensure the integrity of the investigation, including restricting access to systems, premises and relevant information where appropriate.
Investigatory Meetings
As part of the investigation, meetings may be held with the employee concerned, witnesses and any other relevant parties.
These meetings should be arranged promptly to ensure that evidence is accurate and that recollections are still fresh.
Investigatory meetings are fact-finding discussions only and are not disciplinary meetings. Employees should be made aware of this at the outset.
Although there is no statutory right for an employee to be accompanied at an investigatory meeting, employers should consider whether allowing accompaniment would be appropriate in the circumstances, particularly where disability or language barriers exist.
Conducting Investigatory Meetings
Investigatory meetings should be carried out in a calm, structured and impartial manner. Managers should remain open-minded and avoid reaching any conclusions before all evidence has been considered.
Good practice includes asking open questions, avoiding leading questions, taking accurate notes and ensuring that the employee has an opportunity to explain their version of events.
Completing the Investigation Report
Once all evidence has been gathered, the investigator should prepare a clear and structured investigation report.
The report should summarise the investigation process, set out the evidence obtained and highlight any relevant mitigating factors or inconsistencies in the evidence.
The purpose of the report is to present the facts in a clear and balanced way to enable the disciplinary decision-maker to determine whether further action is required.
Once complete, the investigation file should be passed to the appropriate manager for consideration of next steps.
Need help structuring a fair and legally compliant investigation? If you are responsible for managing disciplinary processes in practice, our Workplace Investigation Toolkit provides a complete step-by-step system, including templates, checklists and report structures to support every stage of the process.
View the Workplace Investigation Toolkit
What Happens Next?
Once the investigation has been completed, the investigation report will be reviewed by the appropriate Disciplinary Manager. Their role is to consider the findings objectively and decide whether there is sufficient evidence to proceed to a formal disciplinary meeting.
At this stage, the Disciplinary Manager is not re-investigating the case. They are assessing the evidence gathered and determining whether the matter should move forward under the disciplinary procedure.
There are typically three possible outcomes at this stage:
- No further action: where there is insufficient evidence or no case to answer;
- Informal action: where issues can be addressed through management guidance, training or support; or
- Formal disciplinary meeting: where the matter is sufficiently serious or unresolved and requires further consideration.
Where formal action is required, the employee will be informed in writing and invited to attend a disciplinary meeting. The invitation should set out the allegations, the evidence to be considered and the employee’s right to be accompanied in accordance with the ACAS Code of Practice.
If the matter proceeds to a meeting, the next stage of the process will involve a formal disciplinary meeting where evidence is reviewed and a decision is made.
If you regularly manage disciplinary processes, having a structured framework can significantly reduce risk and improve consistency. Our Workplace Investigation Toolkit provides practical guidance and ready-to-use templates to support managers through every stage of the investigation process.
Explore the Workplace Investigation Toolkit
What Happens If No Misconduct Is Found?
Not all disciplinary investigations result in further action. In many cases, the investigation may conclude that there is no evidence of misconduct or that there is no case to answer.
Where this is the outcome, the matter should be closed and the employee should be informed appropriately. It is good practice to confirm in writing that no further disciplinary action will be taken.
However, even where formal misconduct is not found, the investigation may still identify underlying issues that require attention. In these circumstances, employers may consider alternative approaches such as:
- Informal management action: addressing minor issues through day-to-day management rather than formal procedures;
- Training or guidance: providing additional support to help the employee understand expectations or improve performance;
- Mediation: where workplace relationships or communication issues have contributed to the concern;
- Support measures: such as adjustments to workload, duties or working arrangements where appropriate.
Taking proportionate action at this stage can help resolve issues early, improve performance and avoid the need for formal disciplinary proceedings in the future.
In some cases, no further action is required beyond the investigation stage, and the matter is formally closed.
How Long Should An Investigation Take?
There is no set or prescribed timescale for completing a disciplinary investigation. The time required will depend on the complexity of the case, the availability of evidence and the number of witnesses involved.
However, investigations should always be carried out as promptly as possible whilst still allowing sufficient time to gather and consider all relevant evidence fairly and thoroughly.
Unnecessary or avoidable delay should be minimised. Delays can undermine confidence in the process, create uncertainty for the employee involved and, in some cases, weaken the overall fairness of the procedure.
Employers should therefore balance the need for a thorough investigation with the need to progress matters efficiently and keep all parties informed of expected timescales where possible.
Common Mistakes SMEs Make
Disciplinary investigations are a critical part of a fair and legally compliant disciplinary process. However, in practice, SMEs often make avoidable mistakes that can undermine the integrity of the investigation and increase the risk of claims being brought by employees.
Some of the most common mistakes include:
- Treating the investigation as a disciplinary meeting: the investigation stage is purely fact-finding. It is not about deciding guilt or imposing sanctions.
- Deciding guilt before investigating: prejudging the outcome can lead to a biased investigation and may render any subsequent disciplinary action unfair.
- Only collecting evidence against the employee: a fair investigation must consider evidence both for and against the allegation.
- Failing to investigate promptly: unnecessary delay can damage the reliability of evidence and undermine confidence in the process.
- Poor record keeping: incomplete or inconsistent notes can create difficulties later if the decision is challenged.
- Failing to interview key witnesses: overlooking relevant witnesses can result in an incomplete or one-sided investigation.
- Allowing the investigator to become the disciplinary decision maker: combining roles can compromise impartiality and weaken the fairness of the process.
Avoiding these common pitfalls helps ensure that disciplinary investigations are fair, balanced and compliant with the ACAS Code of Practice. A well-conducted investigation not only supports better decision-making but also strengthens employee trust in the process.
Relevant Case Law
A key principle in disciplinary investigations is the need for separation between the different stages of the process. In a case involving a small employer, a dismissal was found to be unfair because one individual carried out the investigation, made the disciplinary decision and also dealt with the appeal.
The tribunal held that this lack of separation compromised the fairness and independence of the process, even where the employer believed they were acting in good faith due to limited resources.
This case highlights why it is important to allocate different individuals to the investigation, disciplinary meeting and appeal stages wherever possible.
Consistency Matters
Consistency is a key principle in any disciplinary investigation process. Employees are far more likely to accept outcomes where investigations are conducted in a fair and consistent manner, evidence is gathered objectively and similar situations are treated in a similar way across the organisation.
This does not mean that every case must be handled identically, as each situation will have its own facts and circumstances. However, employers should ensure that the same underlying standards, processes and expectations are applied wherever possible.
Inconsistent handling of investigations can lead to perceptions of unfairness, damage employee relations and increase the risk of grievances or claims. By contrast, a consistent approach helps to build trust in the process and demonstrates that decisions are based on evidence rather than individual judgement or bias.
Confidentiality During Investigations
Confidentiality is a fundamental part of any disciplinary investigation. Employers should ensure that information relating to the investigation is shared only with those who genuinely need to be involved in the process.
Limiting disclosure helps protect the integrity of the investigation, encourages witnesses to provide honest and open evidence, and reduces the risk of misinformation spreading within the workplace.
Managers should take active steps to avoid workplace gossip or speculation. While it may not always be possible to keep an investigation entirely private, employees involved should be reminded of their responsibility to maintain confidentiality wherever possible.
Confidentiality also has a data protection aspect. Any personal data collected during the investigation should be handled in line with UK GDPR principles, kept secure, and retained only for as long as necessary in accordance with the organisation’s data retention policy.
How Kea HR Can Help
Managing disciplinary issues and investigations can be challenging for SMEs, particularly when issues are complex, sensitive or involve potential legal risk. Ensuring a fair, consistent and well-documented process is essential, but many employers do not have the internal HR resource to manage this effectively.
Kea HR provides practical, independent support to help employers manage disciplinary investigations and procedures in line with the ACAS Code of Practice and current employment law.
Our support can include:
- Independent disciplinary investigations: carrying out impartial investigations to establish the facts and ensure fairness throughout the process;
- Investigation reports: producing clear, structured reports that summarise evidence and support fair decision-making;
- Disciplinary support: advising employers through the disciplinary process, including hearings and outcome decisions;
- Manager training: helping managers understand how to conduct fair investigations and apply procedures consistently; and
- Meeting support: providing guidance or attendance support during investigatory or disciplinary meetings where required.
By ensuring a structured and legally compliant approach, we help employers reduce risk, improve consistency and handle disciplinary matters with confidence and fairness.
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Disciplinary investigations must be handled fairly, consistently and in line with the ACAS Code of Practice. Getting it wrong can lead to grievances, tribunal claims and damaged employee relations. Speak directly with our CIPD-qualified HR expert with 30+ years’ experience for practical support with investigations, disciplinary procedures and complex employee issues, including independent investigations where required. |
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