Probation and trial periods are two of the most useful tools for employers — but also two of the most commonly confused. They sound similar, but they work very differently, have different legal requirements, and carry different risks depending on whether you’re operating in New Zealand or Australia.
A lot of employers unintentionally misuse one (or both), which can make a termination unsafe, unfair, or even unlawful. But once you understand the difference in plain English, it becomes much easier to choose the right approach, manage expectations, and protect your business.
Here’s everything leaders and HR professionals need to know — without legal jargon and with practical tips you can apply immediately.
The simplest way to understand the difference
Let’s start with the most important distinction:
- Australia uses probation (usually 3–6 months).
- New Zealand uses trial periods (90 days) OR probation — depending on the situation and eligibility.
These terms are often confused, but they are not interchangeable.
PART 1: Probation (NZ + Australia)
What probation is
Probation is a structured review period where the employer assesses whether the employee is meeting expectations. It allows time to:
- check capability
- provide support
- give feedback
- evaluate behavioural fit
- coach and train
Probation does not remove the need for fair process.
Whether you’re in Australia or NZ, probation is not:
- a licence to dismiss without discussion
- an automatic “easy exit”
- a termination shortcut
- a replacement for performance management
You still must:
- set clear expectations
- raise concerns early
- give the employee a chance to improve
- document concerns
- be fair and reasonable
This surprises many employers.
Terminating employment during probation
A fair process is still required in both countries.
This means:
- raising concerns
- providing information
- allowing a support person
- giving a chance to respond
- genuinely considering the response
While the threshold for termination may be lower, process still matters.
Length of probation
Typical lengths:
- Australia: 3–6 months
- New Zealand: 3 months (or as agreed in the employment agreement)
The length must be specified in writing before employment begins.
Common mistakes during probation
- failing to meet regularly with the employee
- not giving specific feedback
- waiting until the final week to raise concerns
- assuming you don’t need fair process
- unclear expectations or untrained managers
One HR Unlocked client said:
“We used to ignore probation until the last week. Now we treat it as a structured support period — and our outcomes have improved dramatically.”
Probation works best when it is proactive, not reactive.
PART 2: New Zealand’s 90-Day Trial Period (unique to NZ)
What a 90-day trial period actually is
A 90-day trial period allows eligible NZ employers to dismiss an employee within the first 90 days without the employee bringing a personal grievance for unjustified dismissal.
But — and this is crucial — the rules are strict.
Who can use a 90-day trial period?
Only NZ employers who:
- have fewer than 20 employees, and
- include the correct trial period clause in the employment agreement, and
- ensure the agreement is signed before the employee starts work
If any of these conditions fail, the trial period is invalid.
What a 90-day trial period does NOT do
It does not:
- remove the requirement for good faith
- override minimum employment rights
- allow unfair or unreasonable behaviour
- justify withholding pay or entitlements
- apply if the clause was not agreed in writing before work began
And — despite common belief — it does not prevent claims of:
- discrimination
- harassment
- bullying
- unjust disadvantage
- wage or holiday pay breaches
It only protects against a personal grievance for unjustified dismissal.
Ending employment during a 90-day trial period
Although a disciplinary-style process isn’t required, good faith still applies. You must:
- act fairly
- communicate transparently
- give the employee a clear reason (recommended)
- give reasonable notice (per the employment agreement)
Fairness still matters — for integrity, risk management and cultural impact.
Probation vs Trial Period: The side-by-side comparison
| Feature | Probation (NZ + AU) | NZ 90-Day Trial Period |
| Where used? | NZ & Australia | New Zealand only |
| Must follow fair process? | Yes | Basic good faith required; formal process not mandatory |
| Needs clear expectations and support? | Yes | Recommended but not legally required |
| Can the employee bring an unjustified dismissal claim? | Yes | No (but can bring other claims) |
| Must the clause be in writing? | Yes | Yes, and signed before work starts |
| Purpose | Review performance and suitability | Allows early exit if not a good fit |
So which should you use?
Use probation if:
- you want to assess skills, behaviour and fit
- you want flexibility without cutting corners
- you are in Australia
- you are a NZ employer with 20+ staff
- you want to emphasise support and coaching
Use a trial period if:
- you are in NZ
- you have fewer than 20 employees
- you want a legally simpler exit path during the first 90 days
In NZ, some employers use both — a trial period followed by a short probation period — if written and structured correctly.
The bottom line
Probation and trial periods are powerful when used properly — and risky when misunderstood.
Across ANZ, the principles are the same:
- set expectations early
- meet regularly
- communicate clearly
- document everything
- provide support
- act fairly
- never leave concerns until the last minute
These tools aren’t designed to make termination easy.
They’re designed to help employers make informed decisions — and help employees succeed.
Used well, they strengthen culture, reduce conflict, and prevent issues becoming bigger than they need to be.
If you want ANZ-ready templates for probation, trial periods, support plans, meeting scripts and termination letters, HR Unlocked gives you everything you need — without the consulting fees or the legal jargon.
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