Quick Summary
Quick Summary
- Workplace investigations are your legal shield — they protect you if a dismissal is later challenged
- Always appoint an impartial investigator; external investigators carry more weight with the FWC
- Notify the employee of allegations in writing and give them a fair chance to respond
- Interview witnesses separately, document everything, and gather evidence systematically
- Before dismissing, issue a show-cause letter and consider the employee’s final response
When conflict arises in your workplace — misconduct allegations, performance concerns, bullying complaints, or safety incidents — the way you investigate directly affects your legal exposure. Conduct an investigation poorly, and you risk unfair dismissal claims, breach of natural justice lawsuits, and damaged employee relations. Get it right, and you’ve built a documented, defensible foundation for any disciplinary action that follows.
This guide walks you through the legal requirements for conducting workplace investigations under the Fair Work Act, plus practical steps to protect yourself and treat employees fairly.
Why Workplace Investigations Matter Legally
The Fair Work Commission frequently reviews investigation processes in unfair dismissal and general protections claims.
When Do You Need to Conduct a Workplace Investigation?
Not every workplace issue requires a formal investigation. Use this framework:
- Misconduct allegations: theft, dishonesty, breach of policy, deliberate rule-breaking
- Bullying or harassment claims: witness accounts, patterns of behaviour, protected-attribute harassment
- Safety incidents: injury, near-miss, safety non-compliance
- Performance or conduct concerns affecting others: absenteeism, customer impact, team dynamics
- Policy breaches: confidentiality, conflicts of interest, WHS violations
Step 1: Document Everything From Day One
The moment you become aware of an allegation or incident, start recording facts:
- Date, time, location and who was involved: names, roles, and exactly when/where it happened
- What was observed: the specific behaviour witnessed, not interpretations — plus any witnesses
- Impact and immediate response: the consequence to the business or safety, and what you did straight away (e.g., separating staff, notifying management)
Step 2: Appoint an Impartial Investigator
This is critical for natural justice.
- Internal investigator: A HR manager or senior staff member who has no direct involvement in the dispute and no reporting relationship to the employee being investigated
- External investigator: A specialist employment investigator, barrister, or HR consultant — especially valuable if the allegation involves senior staff, complex allegations, or if internal resources are limited
Step 3: Notify the Employee and Define the Scope
Before the investigation starts, inform the employee in writing:
- The allegation and the policy/law breached: specific and clear, pointing to the relevant policy, contract clause, or Fair Work Act provision
- Who is investigating and the timeline: name, role, declared impartiality, and when they’ll be interviewed and hear the outcome
- Right to representation and confidentiality: they can bring a support person or union rep, and shouldn’t discuss it with other staff (though you can’t stop them seeking legal advice)
Step 4: Interview the Employee Being Investigated
Conduct the interview fairly and thoroughly:
- Give full detail and let them respond: the employee must know exactly what they’re accused of, and be allowed to explain in full without interruption, with a support person or union rep present
- Ask open questions and record everything: “Tell me what happened on 15 June?” — not leading questions — and keep written notes or a transcript the FWC can review later
Never conduct an ambush investigation or interview the employee in front of peers. Do it privately, professionally, and with dignity.
⚠️ Important Procedural Deadline
If you dismiss an employee without a fair investigation, the Fair Work Commission is significantly more likely to find the dismissal unfair — regardless of the underlying misconduct. Invest in the process upfront.
Key Takeaways
Key Takeaways for Employers
- ✓Investigation triggered by misconduct, bullying, safety breach, or policy violation
- ✓Investigator appointed with no conflict of interest; external investigator preferred for complex cases
- ✓Employee notified with full allegation details and timeline
- ✓Fair hearing conducted; support person allowed
- ✓Witness interviews documented; conflicting accounts assessed fairly
- ✓Evidence weighed on balance of probabilities, not suspicion
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Step 5: Interview Witnesses Independently
For each witness, conduct separate interviews:
- Ask what they directly observed (not rumour) and get specific dates/times — vague accounts carry less weight
- Clarify inconsistencies between accounts and remind witnesses the investigation is confidential
- Document their account in writing and have them sign off on its accuracy
Step 6: Gather Documentary Evidence
Collect all relevant records:
- Records and communications: emails, messages, CCTV, timesheets, and the policy documents allegedly breached
- History and agreements: prior warnings/disciplinary history, the employment contract or award, and any formal complaints on file
Step 7: Assess the Evidence Against the Allegation
Now the investigator weighs up the evidence:
- Credibility and balance of probabilities: which account is more plausible, and is it more likely than not proven (the civil standard, not “beyond reasonable doubt”)?
- Severity and mitigating factors: how serious is the breach, and are there factors like a first offence or genuine misunderstanding that affect the outcome?
Step 8: Report Findings and Recommendations
The investigator should produce a written report covering:
- Summary, evidence and findings of fact: what was investigated, what was reviewed, and what is proven or not
- Conclusions and recommended action with reasoning: was the allegation substantiated, and what action (counselling to dismissal) is appropriate and why
Step 9: Decide on Action and Communicate
Based on the investigation findings, you decide on next steps.
- Issue a show-cause letter: tell them what the investigation found, that dismissal is being considered, and give 5–7 business days to respond in writing before proceeding
- Communicate the outcome in writing: specify the reason, reference the investigation findings, and confirm final pay and leave entitlements
Common Pitfalls to Avoid
- Bias, incomplete interviews, or an unfair hearing: recuse a conflicted investigator, follow up on all witnesses, and ensure the employee knows what they’re accused of and can respond
- Dragging out the process or discussing it with other staff: investigations should take weeks not months, and outcomes stay confidential
- Failing to document, or treating the investigation as pre-decided: if it’s not written down it didn’t happen, and the FWC will see through an investigation used to justify a decision already made
Workplace Investigations and the Fair Work Act
Investigations alone don’t determine the legal outcome of a dismissal.
Getting Expert Help
If you’re unsure whether an investigation is needed or how to conduct one fairly, we’re here to help. Workplace investigations require both legal knowledge and practical judgment. A misstep can cost you dearly in an unfair dismissal claim.
Call Fair Work Centre on 1300 161 828 or book a free initial guidance call. Our employment lawyers can review your specific situation, advise whether an investigation is needed, and guide you through the process step-by-step. We also provide specialist investigator referrals if you need an external investigation.
Frequently Asked Questions
An investigation is the process of gathering facts and evidence about an alleged breach. Discipline (warnings, suspension, dismissal) is the action you take based on investigation findings. Fair Work law requires that you investigate fairly before disciplining — the investigation must be impartial and the employee must have a fair hearing. If you skip the investigation and jump straight to dismissal, the Fair Work Commission is likely to find the dismissal was unfair, regardless of whether the underlying misconduct was real.
You can conduct initial fact-finding — interviewing witnesses, gathering documents — without immediately notifying the employee. However, before any formal interview or if the investigation might lead to disciplinary action, you must notify the employee in writing of the allegation and give them a fair chance to respond. Conducting a full investigation in secret and then dismissing the employee based on findings they never heard violates natural justice and is a classic unfair dismissal risk.
You can conduct an internal investigation if you appoint someone impartial with no conflict of interest — typically a senior HR manager or manager not involved in the situation. However, external investigators are often preferable because they bring impartiality, professionalism, and credibility. The Fair Work Commission takes external investigations more seriously. For complex allegations, bullying, or senior staff misconduct, external investigation is strongly recommended. The cost ($2,000–$5,000 typically) is far less than the risk of losing an unfair dismissal claim.
Most investigations should be completed within 2–4 weeks from notification to final outcome. Prolonged investigations create uncertainty, damage morale, and suggest a lack of urgency or fairness. If an investigation drags on for months, the Fair Work Commission may infer you were uncertain of your case or that the process was unfair. Set a timeline upfront (e.g., ‘6 business days for the employee to respond, 2 weeks for investigator to complete report, 1 week for final decision’) and stick to it.
Yes. In your notification letter, you should explicitly state that the employee can bring a support person, union representative, or chosen delegate to their interview. This is best practice and strengthens your fair process. The support person’s role is to support the employee — not to direct the interview or prevent the investigator from asking questions. They can attend the interview, take notes, and offer advice to the employee, but the investigation must proceed fairly and thoroughly.
If witnesses give different versions of events, the investigator must assess credibility: Which account is more detailed, specific, and consistent with documentary evidence? Are there corroborating details that support one account over another? The investigator should interview witnesses again if needed to clarify inconsistencies. On the balance of probabilities (more likely than not), which version is most plausible? Document this reasoning in the investigation report. The Fair Work Commission understands that witness accounts may differ — you’re not required to find perfect agreement.
You must give the employee a final opportunity to respond before dismissal. Even if the investigation substantiates misconduct, issue a written ‘show-cause’ letter telling them what was found and that dismissal is being considered. Give them 5–7 business days to respond in writing with any final comments or mitigating circumstances. Only after considering their response should you make a final decision. Skipping this step is a procedural unfair dismissal risk — the Fair Work Commission sees it as denial of natural justice.
If the investigation concludes that the allegation is not substantiated (doesn’t meet the ‘balance of probabilities’ test), you must inform the employee in writing and confirm that no action will be taken. You must also ensure the employee is treated fairly going forward — don’t hold the unproven allegation against them or create a hostile work environment because they were investigated. If the allegation was serious and highly publicised internally, consider briefly informing relevant staff that the matter has been resolved (without details) to restore the employee’s standing.
Investigation records — the report, witness statements, interview notes — are confidential. You don’t share them with staff, and you discourage witnesses and the employee from discussing details publicly. Breaching confidentiality can lead to privacy complaints and damage. However, if the investigation leads to public disciplinary action (e.g., a written warning or dismissal), the broader team may be aware of the outcome. You can confirm that a matter has been investigated and resolved without disclosing specifics. If staff ask, redirect them to HR or management and maintain confidentiality.
If an employee refuses to be interviewed or cooperate, document this refusal clearly in writing. Continue the investigation based on available evidence — witness accounts, documents, and any admissions already made. Issue a show-cause letter and proceed based on what you’ve found. Refusal to cooperate can itself be conduct warranting discipline. However, be aware that the Fair Work Commission may view an investigation based solely on other people’s accounts — without the employee’s response — as less fair. This increases your unfair dismissal risk. If an employee refuses to cooperate, consult an employment lawyer before proceeding to dismissal.
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