When A 90-Day Trial Period Is Valid In New Zealand

Hiring your next team member is exciting - but it can also feel like a big risk, especially when you’re running a small business and every wage dollar counts.

If you’ve been Googling things like trial period in New Zealand, you’re probably trying to work out how you can bring someone on, test whether they’re the right fit, and still protect your business if it doesn’t work out.

The good news is that New Zealand employment law does give employers options. The not-so-good news is that trial periods and probation periods are not the same thing, and getting the wording, process or timing wrong can take away the protections you thought you had.

Below, we break down what a trial period in NZ is, what makes it legally valid, how it differs from a probation period, and what you should be doing (and documenting) during those early weeks so you’re protected from day one.

What Is A Trial Period In New Zealand?

In New Zealand, a “trial period” usually refers to the 90-day trial period regime under the Employment Relations Act 2000.

A properly set up trial period can allow you to dismiss a new employee within the trial period (up to 90 days) and the employee can’t bring a personal grievance for unjustified dismissal about that termination.

That can be incredibly helpful for small businesses - but only if you meet the strict legal requirements. You also still need to comply with your wider obligations (including acting in good faith and following a fair process where appropriate).

Why Do Employers Use Trial Periods?

From a business owner’s perspective, trial periods are often used to:

• reduce the risk of a long-term commitment if the employee isn’t the right fit;
• test whether someone can actually do the job (not just interview well);
• protect customer experience and team culture if things aren’t working;
• create a clear “ramp up” period with expectations and checkpoints.

But a trial period isn’t a “free pass” to terminate someone for any reason with no care. The legal protection is narrower than many employers expect.

What Does A Trial Period Not Cover?

Even with a valid trial period, there are still risks you need to manage. For example, employees may still be able to raise claims relating to:

• discrimination (for example, under the Human Rights Act 1993);
• harassment or bullying;
• health and safety issues (for example, if someone is dismissed after raising safety concerns);
• other personal grievances that aren’t about “unjustified dismissal” (depending on the facts);
• breaches of good faith obligations under the Employment Relations Act 2000.

So, think of the 90-day trial as one tool in your hiring toolkit - not a replacement for good onboarding and good management.

When Can You Use A 90-Day Trial Period (And What Makes It Valid)?

This is where most employers trip up. A trial period in NZ is only effective if it’s set up correctly before the employee starts work.

Also, the availability of 90-day trial periods has changed over time. At the time of writing, the law generally limits 90-day trial periods to employers with 19 or fewer employees. Because legislation can change, it’s worth getting advice on whether you’re eligible right now (especially if you’re near that headcount threshold).

If you’re putting a trial period into your business, you should have a properly drafted Employment Contract that matches your situation and your headcount.

Trial Period Checklist (What You Need To Get Right)

To give your trial period the best chance of being enforceable, make sure you cover the essentials:

• It must be in writing in the employment agreement.
• It must be agreed before the employee starts work (not on day one, not after training, not after their first shift).
• The employee must be new to your business (you generally can’t use a trial period for an existing employee moving roles, or someone you’ve previously employed - the details matter, so get advice).
• The clause should clearly state the employee can be dismissed during the trial period and can’t bring a personal grievance for unjustified dismissal.
• You should give clear notice of termination in line with the contract (a trial period doesn’t automatically mean “no notice” - check what your agreement says, and get advice if you’re unsure).
• You must act in good faith - even when you’re ending employment during a trial.

It’s also important that the trial period clause is genuinely agreed as part of the employment agreement. In practice, that means giving the employee a real opportunity to consider the agreement, seek independent advice, and negotiate terms before signing.

If you’re ever in doubt, it’s worth speaking with an Employment Lawyer before you rely on the clause. A small drafting or process issue can be the difference between a clean exit and a costly dispute.

How Do You Count “19 Or Fewer Employees”?

Headcount rules can get technical. For example, you may need to think about:

• full-time and part-time employees;
• employees across different locations;
• related entities (for example, if you operate through multiple companies);
• what happens if your team grows during the trial period.

This is one of those areas where a quick chat early can prevent major headaches later - especially if your business is growing.

Do You Still Need A Fair Process During A Trial Period?

Even with a valid trial period, you’re still expected to act in good faith and behave like a fair and reasonable employer. While a 90-day trial period can limit an unjustified dismissal grievance, process and communication still matter (and poor process can increase risk in other types of claims).

In practice, that usually means:

• being clear about what the job is and what “good” looks like;
• raising issues early (not waiting until day 89);
• giving the employee a reasonable opportunity to respond, and (where appropriate) improve; and
• documenting key conversations and expectations.

Put simply: the trial period is there to reduce legal risk, not to encourage surprise terminations.

What Is A Probation Period (And How Is It Different)?

A probation period is different from a 90-day trial period - and it’s often the better fit for many NZ employers (especially if you’re not eligible for a trial period).

In simple terms, a probation period is an agreed “settling in” period at the start of employment where you assess performance and fit. However, unlike a valid 90-day trial period, a probation period does not remove the employee’s right to raise a personal grievance for unjustified dismissal.

So Why Use A Probation Period?

Probation periods are still useful because they help you set expectations and build a fair record. They can also create a clear structure for:

• training and onboarding milestones;
• regular check-ins and feedback;
• performance improvement support early in employment; and
• decision-making if the role truly isn’t working out.

Most importantly, a well-run probation period supports a fair process - which is what you need if you later end the employment relationship.

Trial Period Vs Probation Period (Quick Comparison)

• Trial period: only available in certain situations; must meet strict legal requirements; limits unjustified dismissal claims if valid.
• Probation period: generally available if agreed; does not remove rights to claim unjustified dismissal; focuses on structured performance management.

Many businesses choose a probation period even when a trial period is available because it forces good habits: clearer feedback, better documentation, and fewer “awkward surprises”.

How To Manage Performance During Trial Or Probation (Without Getting Burnt)

Whether you’re relying on a trial period clause in New Zealand or using a probation period, the practical approach is similar: set expectations early, communicate often, and document what happens.

This is especially important if you end up needing to terminate employment, because what you did (and what you can prove) will matter. Having a structured Performance Management Process can make all the difference.

Step 1: Set Clear Expectations From Day One

Before the employee starts (or at least in their first week), make sure you’ve clearly communicated:

• their main duties and KPIs (even simple ones);
• expected working hours, breaks, and reporting lines;
• behavioural expectations (teamwork, punctuality, communication);
• what training and support you’ll provide; and
• what you’ll be assessing during the first 30/60/90 days.

A surprising number of early employment disputes happen because the employer and employee had different ideas of what the job actually involved.

Step 2: Schedule Check-Ins (And Actually Do Them)

For a 90-day period, a simple structure might look like:

• Week 1: onboarding review (is the employee settling in, do they understand the role?).
• Week 3–4: first performance review (what’s going well, what needs improvement?).
• Week 6–8: second review (have issues improved, is support needed?).
• Week 10–12: final review (confirm ongoing employment or make a decision).

These don’t need to be long meetings. Even 15–20 minutes with a short file note afterwards can be enough to show you acted reasonably and in good faith.

Step 3: Address Issues Early (And Be Specific)

If something isn’t working, avoid vague feedback like “not a good fit” or “not up to scratch”. Instead, focus on facts:

• what happened (dates and examples);
• what standard you expected;
• what support/training you’ll provide; and
• what needs to improve, by when.

This is also where your documentation matters. If you ever need to justify your decision-making, contemporaneous notes are far better than trying to recreate conversations months later.

Step 4: If You Need To End Employment, Don’t Wing It

Termination is one of the highest-risk employment steps for any small business. Even where a trial period applies, you need to be careful about process, notice, and messaging.

Before taking action, it’s smart to get advice on the safest pathway - especially if there’s any hint of a protected issue (health condition, discrimination risk, complaint, leave request, etc.). If you’re looking for the practical steps involved, How To Terminate An Employee is a helpful starting point.

Common Mistakes Employers Make With Trial Periods And Probation

Most trial period problems aren’t caused by bad intentions - they’re caused by rushed hiring, template documents, or misunderstandings about how the law works.

Here are some common traps we see for NZ employers.

1. Getting The Employee To Sign After They Start

This is one of the biggest mistakes with a trial period clause in New Zealand. If the employee starts work before agreeing in writing, the trial period may be invalid - and you lose the protection you were relying on.

To avoid this: send the employment agreement early, encourage the employee to get independent advice, allow time for questions or negotiation, and make signing a condition before they start.

2. Using The Wrong Clause For Your Situation

If your business has grown, your eligibility for a 90-day trial period may have changed. Or you might be trying to use a trial period for someone who isn’t “new” in the way the law requires.

To avoid this: have your agreements reviewed as your business scales, and don’t assume last year’s template still works this year.

3. Treating A Trial Period Like “No Rules Apply”

Even with a valid trial period, acting unfairly or inconsistently can still create legal risk (and it’s also bad for your reputation as an employer).

To avoid this: follow a simple, fair process and keep written records of key decisions.

4. Not Having A Paper Trail

If you end up in a dispute, the question often becomes: “What happened, and what can you prove?”

To avoid this: keep notes of check-ins, training provided, warnings (if any), and performance expectations. It doesn’t need to be complicated, but it does need to exist.

5. Confusing Performance Issues With Restructuring Or Redundancy

Sometimes the issue isn’t the employee - it’s the role. If your business changes and the work is no longer needed, that’s generally a redundancy situation, not a performance issue.

Mixing these up can create serious risk. If the real reason is that you no longer need the position, you’ll want to handle it as a Redundancy process rather than trying to “performance manage” your way out of it.

Key Takeaways

• A trial period in New Zealand usually refers to the 90-day trial period regime, which can limit unjustified dismissal claims if it’s set up correctly.
• Trial periods have strict requirements - including that the clause must be agreed in writing before the employee starts work.
• At the time of writing, 90-day trial periods generally apply only to employers with 19 or fewer employees, so eligibility needs to be checked carefully.
• A probation period is different: it’s a structured assessment period but does not remove the employee’s right to raise a personal grievance for unjustified dismissal.
• Whether you use a trial period or probation period, you’ll be in a much stronger position if you set expectations early, hold regular check-ins, and document performance conversations.
• If you’re ending employment (even during a trial), get the process, notice, and wording right - termination is high-risk and small mistakes can be expensive.

If you’d like help setting up a legally compliant trial or probation period, or updating your Employment Contract so it actually protects your business, you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.