Workplace Investigations: Getting Them Right the First Time

When a serious complaint lands — bullying, harassment, a safety breach, suspected misconduct — how you respond in the first few days often matters as much as what actually happened. A rushed or sloppy investigation can turn a manageable problem into an unfair dismissal claim, a Fair Work complaint, or a workplace that no longer trusts you. This is how to run one properly, without needing to be a lawyer to get the fundamentals right.

Decide first whether you even need a formal investigation

Not every complaint requires a full investigation, and treating a minor grievance like a tribunal case can do more harm than good. A formal process is warranted when the allegations are serious, contested, or could lead to disciplinary action or dismissal. Lower-level interpersonal issues are often better resolved through a direct conversation, mediation, or a manager stepping in early. The key judgement is: if this were later scrutinised by Fair Work or a court, would a quiet chat look like a reasonable response, or like a cover-up? When in doubt on anything serious, err towards a proper process — and get advice before you start.

The principles that make an investigation defensible

Almost every investigation that falls over does so on the same two grounds: it wasn't fair, or it wasn't impartial. Procedural fairness (natural justice) isn't legal jargon you can skip — it's the standard your process will be measured against. In practice it means:

• Tell the respondent the specific allegations — in enough detail that they can actually respond. "Someone complained about your behaviour" isn't enough; they need to know what, when, and who is affected, subject to any genuine confidentiality concerns.
• Give them a genuine chance to respond before any conclusion is reached, and let them bring a support person to meetings.
• Keep the investigator impartial. The person deciding the facts shouldn't be someone with a stake in the outcome or a close relationship with either party. If nobody internal is genuinely neutral, use an external investigator.
• Decide on the evidence, not on reputation. The standard is the balance of probabilities — is it more likely than not that this happened — based on what you can actually substantiate.

A workable sequence

The mechanics matter, and getting the order right keeps you fair:

• Act promptly and plan. Take the complaint seriously and move quickly, but plan the process before you start interviewing. Consider whether any interim steps are needed to keep people safe while you investigate — without pre-judging guilt.
• Interview the complainant, then the respondent, then witnesses. Ask open questions, stick to the allegations, and separate what people directly saw or heard from what they assume or were told.
• Take proper notes and gather documents. Contemporaneous records, emails, rosters, CCTV where relevant — evidence beats recollection every time, and your notes may later be the record that matters.
• Put adverse material to the respondent. If a witness says something that counts against them, they need a chance to answer it before you conclude. This is where many well-meaning investigations fail.
• Make findings on each allegation — substantiated, not substantiated, or unable to determine — and set out the reasoning.

Confidentiality, welfare and the traps

Confidentiality protects everyone: the complainant, the respondent (who is not guilty of anything yet), witnesses, and the integrity of the process. Limit information to those who genuinely need it, and warn participants against gossiping about the matter. At the same time, look after the wellbeing of everyone involved — investigations are stressful, and a complaint being investigated is not a finding of guilt. Watch particularly for the trap of the person under the cloud being quietly punished before any finding is made, and for anything that could look like victimisation of the person who raised the concern, which carries its own legal risk.

Separate the finding from the consequence

A common mistake is to bundle "what happened" and "what we're going to do about it" into one decision. Keep them apart. The investigation establishes the facts; a separate step decides the outcome, taking into account the findings, the person's history, and what's fair and proportionate. If dismissal is on the table, the requirements around a valid reason and a fair process are strict — this is the point at which the cost of getting it wrong is highest. Your applicable modern award or enterprise agreement, and the employee's contract, may also impose specific steps you have to follow.

Workplace investigations sit inside the wider discipline of getting your people and HR foundations right. Because the legal stakes are real, treat this as general information rather than advice: for any serious matter, and certainly any that might end in dismissal, get advice from an employment lawyer or a qualified HR professional, and check the current guidance from the Fair Work Ombudsman before you act.