Terminating Employment for Medical Incapacity in New Zealand: Risks & Duties

When an employee becomes unwell for a long period (or their health condition means they can’t safely do their job), it can put you in a genuinely tough spot as a small business owner.

You’re trying to do the right thing by your employee, but you also need your business to keep running. And if you get the process wrong, terminating employment due to medical incapacity can quickly turn into an expensive personal grievance.

In this guide, we’ll walk you through what “medical incapacity” means in practice, what New Zealand employers are generally required to do before considering termination, and where the biggest legal risks tend to pop up.

What Counts As “Medical Incapacity” In An Employment Context?

“Medical incapacity” usually refers to a situation where an employee is not able to perform the work they’re employed to do because of illness, injury, or another health condition.

In practice, medical incapacity issues often fall into a few common categories:

• Long-term absence (for example, ongoing sick leave following surgery, injury, or serious illness).
• Repeated intermittent absences that mean the employee can’t reliably perform their role (this can be trickier and needs careful handling).
• Reduced capacity where the employee is at work but cannot perform key duties safely or to the required standard due to a health condition.
• Health and safety risk where continuing in the role could put the employee or others at risk.

A key point: medical incapacity is not “misconduct” or “performance” in the usual sense. Even if the outcome may be termination, the process and the obligations on you as an employer are different.

Also, the law doesn’t set a magic timeframe like “after X weeks you can dismiss”. Each case turns on its facts, including:

• the nature of the role (can it be modified?)
• the length of the absence
• the prognosis (is the employee likely to return and when?)
• how your business is affected (cost, coverage, operational impact)
• what you’ve done to support return to work

What Legal Duties Do Employers Have Before Considering Medical Incapacity Termination?

In New Zealand, ending employment for medical incapacity generally needs to be handled as a termination for inability to perform duties, with strong emphasis on fair process.

The big-picture legal framework most employers bump into here includes:

• Employment Relations Act 2000 (good faith obligations, justification and fair process for dismissal).
• Human Rights Act 1993 (disability discrimination risks and the need to consider whether adjustments are reasonable in the circumstances).
• Health and Safety at Work Act 2015 (your duty to keep workers and others safe).
• Privacy Act 2020 (handling medical information carefully and lawfully).

1) Act In Good Faith And Use A Fair Process

Even where you genuinely believe the job can’t be held open forever, you still need to follow a process that is fair and reasonable.

That usually means:

• telling the employee the concern (for example: their ongoing absence and the business impact)
• gathering relevant information (including medical information, properly obtained)
• consulting with the employee and considering their feedback
• considering alternatives to termination
• only then making a decision, and explaining it clearly

This is one reason having a well-drafted Employment Contract matters - not because it lets you “skip steps”, but because it can set expectations around medical certificates, contact during leave, and how incapacity situations are managed.

2) Provide Support And Consider Reasonable Adjustments

Before termination, you should consider what adjustments might allow the employee to return to work (where it’s reasonable to do so). In New Zealand, there isn’t a single standalone “reasonable accommodations” rule that applies the same way in every case, but failing to consider practical adjustments can increase your risk under good faith/fair process principles and disability discrimination obligations.

Adjustments you might explore can include:

• temporary adjusted duties
• reduced hours or a phased return to work
• additional training or supervision for modified tasks
• equipment or workplace adjustments
• temporary reassignment to another suitable role (if available)

Not every business can absorb these changes, especially small teams. But you do need to turn your mind to the options and document what you considered and why it was or wasn’t workable.

If you’re looking at temporary hours changes as part of a return-to-work plan, it’s worth understanding the legal pitfalls of reducing staff hours without agreement.

3) Keep Health And Safety Front Of Mind

Sometimes the hardest medical incapacity cases involve safety-sensitive work: driving, operating machinery, working at heights, or roles where impaired capacity could put others at risk.

You have a duty to take reasonably practicable steps to keep people safe, including managing risks arising from health conditions that affect safe performance.

That said, “health and safety” shouldn’t be used as a shortcut to dismissal. The safer approach is to:

• get objective information (medical advice where appropriate)
• consider temporary restrictions and modified duties
• consult with the employee about options
• document the safety risks you’re managing

More broadly, your ongoing duty of care as an employer is part of what shapes what “reasonable” looks like in these situations.

How Do You Manage Medical Information Without Creating Privacy Problems?

Medical incapacity situations often require you to ask for more information than a standard sick day. This is where many employers accidentally create legal risk.

As a general rule:

• You can request medical certificates and certain information needed to manage employment (such as expected timeframe for return, restrictions, and capacity).
• You should avoid asking for unnecessary details (diagnosis or full medical history is rarely required).
• You must store and share health information carefully, because it’s sensitive personal information.

Practical tips that help small businesses:

• Explain why you’re requesting information (e.g. “to consider whether we can support your return to work and whether we need temporary adjustments”).
• Ask for capacity-focused information (what they can/can’t do, and for how long), rather than “what condition do you have?”.
• Limit access internally (usually the direct manager and/or HR/payroll only).
• Get consent if you need to contact the employee’s medical professional.

If you’re building out better internal processes, having an Employee Privacy Handbook can be a practical way to set expectations about how you collect, use and store employee information.

Don’t Confuse Sick Leave Issues With Incapacity

It’s also important not to treat medical incapacity as simply “using up sick leave”. Employees may be entitled to sick leave, but entitlement doesn’t automatically answer whether they can continue in the role long-term.

If you need a refresher on minimum entitlements, sick leave rules are a good starting point - but the termination decision still needs to be based on medical capacity, business impact, and a fair process.

What Process Should You Follow Before Termination For Medical Incapacity?

If you’re heading towards termination for medical incapacity, a clear, well-documented process is one of the best ways to reduce risk.

While every situation is different, a common step-by-step approach looks like this:

Step 1: Identify The Issue And Start Early Conversations

Once it becomes clear the absence or health condition may be long-term, don’t wait until frustration builds. Start a supportive conversation early, focusing on:

• how the employee is doing
• what the current medical guidance says about return to work
• what you can do to support them
• what the role requires (so you can discuss accommodations realistically)

Step 2: Gather Relevant Medical Information (The Right Way)

You can ask the employee for medical information that’s relevant to employment decisions, such as:

• likely return-to-work date (if known)
• fitness for work (yes/no, or fit with restrictions)
• limitations (e.g. cannot lift, cannot drive, reduced hours)
• whether the condition is likely to be ongoing

If you’re considering an independent medical assessment, get tailored legal advice first - whether you can require it (and what happens if the employee refuses) often depends on your employment agreement, the circumstances, and whether the request is reasonable and proportionate.

Step 3: Consult On Options (Adjusted Duties, Phased Return, Redeployment)

Before termination, you should actively consider alternatives, such as:

• temporary adjustments (duties, hours, location)
• additional time for recovery (where reasonable)
• temporary cover arrangements
• redeployment into a vacant role (if available and suitable)

Even if you don’t have many options as a small business, your notes should show you properly considered what was possible.

Step 4: Hold A Formal Meeting (With Notice And The Right Information)

If termination becomes a real possibility, treat it as a formal process step. You’ll usually want to:

• invite the employee to a meeting in writing
• explain the purpose (e.g. to discuss their ongoing capacity and possible next steps, including the possibility of termination)
• provide the information you’re relying on (medical certificates, operational impact summary, role requirements)
• remind them they can bring a support person/representative

This is where many businesses slip: if the employee is surprised termination is on the table, they may argue the process wasn’t fair.

Step 5: Consider Their Response And Make A Decision

After the meeting, take time to genuinely consider what the employee has said. If they provide new medical information, you may need to pause and assess it.

If termination is the outcome, communicate the decision clearly in writing, including:

• the reasons (capacity and business impact)
• the alternatives considered and why they weren’t workable
• notice provisions and final pay details
• next steps (return of property, exit arrangements)

If you’re unsure about drafting the termination letter or the process steps, a tailored approach matters - especially because “fair process” is often the main battleground in disputes. In many cases, employers will get advice similar to what’s covered in terminating an employee guidance, but adapted specifically for incapacity scenarios.

Common Employer Mistakes (And The Legal Risks They Create)

Most small business owners aren’t trying to do the wrong thing - but medical incapacity scenarios are emotionally charged and operationally stressful, which is why mistakes happen.

Here are some of the most common pitfalls we see, and what they can lead to.

Rushing To Termination Because “We Need Someone In The Role”

Yes, your business needs the work done. But if you terminate too early without proper consultation and information-gathering, you may face a personal grievance for unjustified dismissal.

A fair process needs to show that you balanced:

• the employee’s situation and medical prognosis, and
• the genuine operational needs of your business.

Trying To Solve It With Annual Leave

It’s tempting to think: “Can we just make them take annual leave while they’re away?” In most cases, directing annual leave has specific requirements (including timing/notice and whether the employee has accrued entitlement), and doing it incorrectly can create disputes quickly.

It’s safer to understand your boundaries around annual leave before using it as a tool in a medical incapacity situation.

Mismanaging Mental Health Scenarios

Mental health conditions often involve fluctuating capacity, sensitivity around privacy, and higher discrimination risk if communications are careless.

Even where the employee is away from work, how you respond matters. Many employers start with basic questions like “can they take a mental health day?” - but longer-term incapacity requires a structured plan and careful documentation. (This can also overlap with your workplace approach to mental health days and wellbeing support.)

Using Stand-Down Or Reduced Hours Incorrectly

Some businesses try to “pause” employment or cut shifts while they work out what to do. This is risky if done without contractual and legal basis.

If you’re considering a temporary pause, be very careful with anything that looks like a stand down, because the legal justification depends heavily on the facts and your agreements.

Privacy Breaches (Even Accidental Ones)

Common privacy mistakes include:

• asking for overly detailed medical information
• discussing the employee’s condition with co-workers to “explain” the absence
• storing medical documents where others can access them

Privacy complaints can escalate quickly and damage trust in a small team, even if no formal claim is filed.

Not Paying Out Correctly At The End

If termination is confirmed, you still need to get the exit right - including notice, final pay, and any accrued entitlements.

Sometimes an employment agreement allows payment in lieu of notice, but whether it’s appropriate in an incapacity context depends on the wording of the contract and the process you’ve followed.

When Is Medical Incapacity Termination Likely To Be Justified?

There’s no one-size-fits-all test, but termination for medical incapacity is more likely to be justified when:

• the employee has been absent for a significant period (or has ongoing restrictions) and the prognosis is uncertain or they’re unlikely to return within a reasonable timeframe;
• you have obtained appropriate medical information focused on capacity and return-to-work likelihood;
• you have genuinely consulted with the employee and considered their feedback;
• you have considered practical adjustments and alternatives (and can explain why they won’t work for your business);
• you have followed a fair process and documented your reasoning;
• you have met notice and final pay obligations.

On the flip side, termination becomes high-risk when the employee can show they were:

• kept in the dark about concerns,
• not given a real chance to respond,
• terminated without proper medical information, or
• treated inconsistently compared to others.

If you’re at the point where termination is being discussed internally, that’s usually a good time to get tailored legal advice - not after the decision has already been communicated.

Key Takeaways

• Termination for medical incapacity in New Zealand is possible, but it needs a fair, well-documented process that meets good faith obligations under the Employment Relations Act 2000.
• You should focus on capacity and prognosis, not assumptions - and gather medical information carefully and only as needed.
• Before termination, you generally need to consult with the employee and genuinely consider practical adjustments, adjusted duties, phased returns, or redeployment where available.
• Health and safety duties can be a legitimate factor in incapacity decisions, but they don’t replace the need for proper consultation and objective information.
• Common employer risks include privacy breaches, forcing annual leave, mishandling stand-down/reduced hours, and rushing the process due to operational pressure.
• Getting the exit right (notice, final pay, and communications) can reduce disputes and protect your business reputation.

If you’d like help managing a medical incapacity termination or reviewing your employment documents and process, you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.