Can The Same Person Run Both An Investigation And Disciplinary Process In NZ?

If you’re running a small business in New Zealand, chances are you don’t have a large HR team on standby when something goes wrong at work.

So when an issue comes up (for example, misconduct, bullying allegations, time theft, or a serious performance concern), a very common practical question is: can the same person handle the investigation and the disciplinary meeting?

This question comes up a lot because owners and managers want to do the right thing, but also need a process that’s realistic for a small team.

In this guide, we’ll explain how running an investigation and disciplinary process through the same person can work in NZ, what the legal risks are, and the steps you can take to keep the process fair and defensible.

Is It Legal For The Same Person To Run The Investigation And The Disciplinary Process In NZ?

In many NZ workplaces, yes - it can be lawful for the same person to carry out both the investigation and the disciplinary process.

However, the bigger issue isn’t “is it allowed?” in a technical sense. The key question is:

Can you run the process in a way that is fair, unbiased (or seen to be unbiased), and consistent with your obligations as an employer?

Under the Employment Relations Act 2000, employers and employees must deal with each other in good faith. In practice, disciplinary processes are commonly assessed against principles of procedural fairness (sometimes called “natural justice”) and, if challenged, the “fair and reasonable employer” test in section 103A (ie, whether the employer’s actions, and how they were carried out, were what a fair and reasonable employer could have done in all the circumstances at the time).

That means when you take disciplinary action, you will usually need to be able to show you:

• Identify the concerns clearly (what’s alleged, when, and why it matters).
• Investigate in a way that is appropriate for the seriousness of the issue.
• Give the employee a genuine opportunity to respond (including time to consider the allegations and bring a support person/representative).
• Keep an open mind until the process is complete.
• Base your decision on reasonable grounds and relevant information.

So, having one person run both the investigation and the disciplinary steps isn’t automatically “wrong” - but it can become risky if it creates (or appears to create) bias, pre-judgement, or a process where the outcome feels decided in advance.

Why Employers Prefer Separating The Roles (And Why It’s Not Always Possible)

Separating the investigator and the decision-maker is often considered best practice, because it helps show independence and reduces the risk of a challenge later.

For example, a “clean” structure might look like:

• Person A investigates and prepares a factual report (without recommending an outcome), and
• Person B considers the report and runs the disciplinary meeting(s) as the decision-maker.

This can be particularly helpful where:

• the allegations are serious (eg, harassment, dishonesty, violence, major safety issues);
• the employee is senior, long-serving, or there are complex facts;
• there is likely to be a dismissal outcome; or
• the business anticipates a dispute, personal grievance, or media/social media attention.

But for many small businesses, the reality is:

• there may only be one owner/manager, and
• that person is the only one with authority to discipline or terminate employment.

That’s why it’s so important to understand how to manage the process carefully if you do need one person to handle both stages.

When Does Using The Same Person Become A Problem?

The main risk with having the same person do everything is that the process can start to look (or actually become) biased.

Here are the most common “red flag” scenarios where a single person handling both the investigation and disciplinary process can create real legal exposure.

1) The Decision Looks Pre-Made

If you’re both the investigator and the decision-maker, you need to be extra careful about language and conduct.

Examples of what can cause problems:

• telling the employee you’ve “already decided” what happened;
• treating the disciplinary meeting as a formality (“we’re just doing this to tick the box”);
• announcing the outcome before the employee has responded.

Even if you genuinely haven’t made up your mind, the appearance of a pre-determined outcome can undermine the whole process.

2) There’s Personal Involvement Or A Relationship Issue

If you’re personally involved in the events (for example, you’re the alleged victim, you witnessed the incident and had a heated exchange, or you’ve had a long-running conflict with the employee), you may not be the right person to investigate and decide the outcome.

In these cases, it’s worth considering an independent investigator or at least having another decision-maker involved (even if that’s an external HR/legal advisor supporting the process).

If you already have policies around conflicts, it helps to apply them consistently - a clear Conflict Of Interest Policy can be useful for setting expectations about when someone should step aside.

3) The Evidence-Gathering Isn’t Properly Separated From The Outcome

Sometimes employers accidentally “blend” the investigation and discipline stages into one conversation - especially in smaller workplaces where things feel informal.

For example, you start asking questions (“what happened?”) and within minutes you’re telling the employee they’re getting a warning or are fired.

This is risky because the employee may not have been given:

• full detail of the allegations and evidence,
• time to consider and respond, or
• a genuine opportunity to bring a support person.

A clear separation of steps (even if done by the same person) helps protect your business.

4) Surveillance, Recordings Or Privacy Issues Are Involved

Investigations often involve CCTV footage, emails, GPS tracking, or phone recordings. This is where employers can accidentally create privacy issues, even when their intentions are reasonable.

If you’re relying on CCTV, it’s worth checking what’s considered appropriate monitoring and notification in NZ workplaces - the rules and expectations can be nuanced. This article on workplace cameras is a helpful starting point.

Similarly, if your investigation involves recorded calls, you’ll want to be careful about how recordings were made and used. This overview on business call recording laws can help you spot common pitfalls.

Privacy issues can also overlap with employment process fairness - for example, if an employee argues you used information you shouldn’t have collected, or you relied on evidence without giving them a chance to view/respond.

Having clear workplace rules can make a big difference here, including a tailored Workplace Policy and appropriate privacy communications for staff.

How To Run A Fair “Same Person” Investigation And Disciplinary Process (Step-By-Step)

If you’re in the common situation where you have to manage both stages, don’t stress - you can still run a solid process. You just need to be deliberate and disciplined about it.

Here’s a practical step-by-step approach NZ employers commonly use.

Step 1: Clarify Whether This Is “Investigation Only” Or “Investigation + Potential Discipline”

At the start, be clear (in writing) that you’re investigating allegations and no decision has been made.

It can help to state:

• what the concern is (in plain language),
• what policies or expectations may be relevant, and
• that disciplinary action is a possible outcome depending on findings.

Step 2: Set A Simple Investigation Plan

You don’t need a 40-page report, but you do need a process you can explain later.

Your plan might include:

• what evidence you’ll review (eg, timesheets, CCTV, emails, customer complaints);
• who you need to speak with (witnesses, supervisors);
• a rough timeline; and
• how you’ll document what you find.

Tip: Keep a running investigation file with dated notes. If the matter escalates, contemporaneous notes can be very important.

Step 3: Give The Employee Enough Information To Respond (But Keep Things Confidential)

A common balancing act is providing enough detail for fairness while protecting confidentiality (especially where witnesses are involved).

As a general rule, the employee should understand:

• what is alleged,
• what the key evidence is (in a form that lets them respond meaningfully), and
• why it’s considered a workplace issue.

Depending on the context, you may be able to provide summaries of witness evidence rather than full statements, but it’s not one-size-fits-all. The test is whether the employee has enough information to respond fairly in the circumstances (and sometimes the underlying detail will be necessary for that).

Step 4: Hold An Investigation Meeting (If Needed) And Keep Your “Decision Hat” Off

If you’re handling both the investigation and disciplinary stages, your investigation meeting should feel exactly like an information-gathering exercise.

Good habits include:

• asking open questions (“Talk me through what happened from your perspective”);
• avoiding loaded language (“You clearly did X…”);
• allowing breaks and offering a support person/representative; and
• not arguing or debating - just clarifying facts.

Step 5: Make Preliminary Findings, Then Invite Feedback Before Finalising

Once you’ve gathered the information, you can form a provisional view about what likely happened.

Before finalising a decision, it’s often important (especially where the consequences could be serious) to give the employee an opportunity to comment on:

• your understanding of the key facts, and
• the seriousness of the issue and possible outcomes.

This is often where employers go wrong: they treat “responding to allegations” as the only chance to be heard. In practice, fairness may also require a chance to respond to the employer’s proposed conclusions and proposed outcome, depending on the circumstances (particularly if termination is a possibility).

Step 6: Hold A Proper Disciplinary Meeting (Separate From The Investigation Stage)

Even if you’re the same person, you can create separation by:

• sending a formal letter/email inviting the employee to a disciplinary meeting,
• attaching the allegations and key evidence,
• stating possible outcomes (including dismissal, if relevant), and
• giving them reasonable time to prepare.

This is also where good documentation matters. If you’re relying on a structured process, having the right templates and tailored documents can save you a lot of pain later - for example, an Employee Termination Documents Suite can help ensure your process is consistent and properly recorded.

Step 7: Make A Reasoned Decision And Communicate It Clearly

When you decide on the outcome, document:

• what you found happened (and why),
• what you considered (including the employee’s responses),
• any mitigating factors (length of service, prior conduct, training, remorse, inconsistency), and
• why the outcome is appropriate.

If you’re moving into formal performance management or termination territory, it’s worth ensuring your approach aligns with a proper process - this is where a structured Performance Management Process can make the pathway much clearer.

Practical Alternatives For Small Businesses (When You Don’t Have HR)

If separating roles internally isn’t possible, you still have options.

Option 1: Use An External Investigator For The Fact-Finding

In higher-risk matters, you can bring in an external investigator to gather facts and provide a report. You can then act as the decision-maker.

This often helps where:

• there are competing accounts and multiple witnesses,
• you’re too close to the situation, or
• you’re worried the employee won’t trust the process.

Option 2: Use An Independent Note-Taker Or Advisor In Meetings

If budget is tighter, even having an independent person present to take notes can help support a fair process and reduce “he said / she said” disputes later.

Option 3: Delegate One Part Of The Process (Even If Authority Stays With You)

In some workplaces, a supervisor can gather initial information, while you hold the disciplinary meeting and make the final decision.

Even if you remain the decision-maker, that division can help reduce perceived bias.

Option 4: Tighten Your Employment Documentation So The Process Is Less Ad Hoc

A lot of disciplinary disputes happen because the process wasn’t clear from the start.

As a baseline, make sure your Employment Contract and workplace policies clearly cover expectations, misconduct, investigation processes, and disciplinary pathways (tailored to your business).

It’s much easier to run a fair process when your business has “legal foundations” in place from day one.

Key Takeaways

• In New Zealand, it can be lawful for the same person to run an investigation and the disciplinary process, but it must be done fairly, in good faith, and in a way a fair and reasonable employer could follow in the circumstances.
• The biggest risks arise when the process looks biased, pre-determined, or when the investigator is personally involved in the dispute.
• Even if one person must handle both stages, you can create fairness by clearly separating steps: investigate first, then hold a formal disciplinary meeting.
• Provide clear allegations and relevant evidence, allow the employee a genuine opportunity to respond, and keep an open mind until the end.
• Be extra careful when using CCTV, recordings, or other monitoring evidence - privacy and process fairness often overlap.
• If the matter is serious or complex, consider using an external investigator or independent support to strengthen the independence of your process.
• Strong contracts, policies, and consistent documentation make disciplinary action far less risky for small businesses.

If you’d like help running a workplace investigation, managing a disciplinary process, or putting the right documents in place to protect your business, you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.