Medical incapacity is one of the hardest and most emotionally challenging areas of employment law. It’s where compassion, safety, business needs, uncertainty and legal obligations collide. Leaders often feel stuck — wanting to do the right thing, but unsure what the law expects, how long is “reasonable”, and when it becomes appropriate to consider ending employment.
Here’s the truth:
Neither New Zealand nor Australia sets a specific deadline for when medical incapacity justifies termination.
Not 4 weeks.
Not 12 weeks.
Not 6 months.
Instead, both legal systems require a fair, individualised, evidence-based assessment.
This blog breaks down the practical steps you need to take to manage medical incapacity well — with humanity, clarity and legal defensibility.
Why “How long is too long?” is the wrong first question
Managers often start with:
- How long do we wait?
- When can we make a decision?
- What’s the normal timeframe?
But the law doesn’t work on fixed numbers.
Instead, NZ’s ERA and Australia’s Fair Work framework look at reasonableness — which depends on:
- the medical information you have
- the role requirements
- the employee’s prognosis
- whether you’ve consulted properly
- whether the employee can safely perform the role
- what support or adjustments are possible
- the size and resources of the organisation
So the better question is:
“What does a fair, reasonable process look like right now?”
Once you follow that process, the right timing becomes much clearer.
The employer’s obligations (NZ + Australia)
Across both countries, employers must:
- act in good faith
- consult with the employee
- request relevant medical information (reasonably)
- genuinely consider adjustments
- assess fitness for work
- make evidence-based decisions
- explore safe return-to-work options
- give the employee a fair opportunity to participate in decisions
You do not need to make decisions based on guesswork.
You make decisions based on evidence — step by step.
Step 1: Start with a welfare meeting (early, not late)
Before anything formal, check in with care:
“I understand you’ve been unwell — how are you doing, and how can we support you?”
This conversation helps you understand:
- current symptoms
- the employee’s perspective
- whether further medical information is needed
- what immediate supports might help
- their likely recovery timeframe
Early welfare meetings prevent issues from becoming adversarial.
Step 2: Request medical information — clearly and fairly
In both NZ and Australia, employers can request medical information when it’s reasonable and relevant to:
- safety
- capacity
- return-to-work planning
- operational impact
The request must be:
- specific
- job-related
- relevant
- fair
- communicated in good faith
Ask doctors for:
- current diagnosis (if the employee consents)
- capacity for work
- restrictions / limitations
- expected recovery timeframe
- recommended supports or adjustments
- clarity on whether the condition is temporary, fluctuating or long-term
You do not need — and should not ask for — deeply personal or irrelevant details.
Step 3: Consider reasonable adjustments
Reasonable adjustments depend on the workplace, the role and the nature of the injury or illness.
Examples include:
- reduced hours
- flexible work
- lighter duties
- modified equipment
- staggered start times
- temporary redeployment
- modified performance expectations
- gradual return-to-work plans
Assessing adjustments is not optional — it is a legal requirement in both NZ and Australia under H&S, good faith and anti-discrimination laws.
Step 4: Assess the operational impact (fairly and honestly)
Medical incapacity is not just a health issue — it’s an operational issue.
You must consider:
- How long the employee has been away
- Whether the absence is intermittent or continuous
- Impact on customers, clients, patients or service delivery
- Cost of temporary cover
- Stress on the team
- The importance of the role
- Whether the company can sustain further disruption
You’re allowed to consider the business — you just must do so fairly and consistently.
Step 5: Consult with the employee before making any decision
Before deciding anything, you must consult.
This means:
- sharing the medical information (with consent)
- explaining your concerns
- seeking the employee’s views
- considering alternatives
- asking about updated prognosis
- giving them time to respond
- exploring whether more medical information is needed
Consultation is a two-way conversation, not a notification.
Step 6: If capacity is unlikely to return — use a fair incapacity process
This process must include:
- written notification of the possibility of termination
- all medical evidence available to both parties
- an opportunity for the employee to respond
- the right to bring a support person
- genuine consideration of alternatives
- a clear, evidence-based decision
There is no “minimum length of absence” required.
What matters is the fairness and completeness of the process.
So… how long is “too long”?
The law says: It depends.
But here are some practical guidelines:
Short-term illness (weeks to a few months)
Usually too early for incapacity — unless the role is safety-critical or the prognosis is severe.
Medium-term absence (3–6 months)
This is often where employers begin the formal incapacity process if:
- prognosis remains unclear
- capacity to return is low
- business impact is significant
- all reasonable adjustments have been considered
Long-term absence (6+ months)
This is typically when termination becomes more likely if all processes have been followed and the evidence supports it.
But remember — the law does not use fixed timeframes.
The process determines fairness, not the calendar.
One HR Unlocked client said:
“Once we stopped searching for the ‘magic timeframe’ and focused on process, the decision became so much easier — and much safer.”
The bottom line
Medical incapacity cases are complex — legally, operationally and emotionally.
But the pathway is simple when you strip it back:
- check in early
- gather medical information
- consult openly
- consider adjustments
- assess operational needs
- make an evidence-based decision
- communicate with care
- document everything
You don’t have to guess.
You don’t have to wait forever.
You just have to follow a fair, reasonable process.
If you want ANZ-ready templates, medical information request letters, welfare meeting scripts, incapacity flowcharts and outcome letters, HR Unlocked gives you everything you need to manage these situations with confidence, kindness and compliance.
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