Extending an Employee's Probation Period in NZ

Hiring someone new is a big step for any small business. Even when you’ve done the interviews, reference checks and onboarding properly, sometimes you just need a little more time to confirm whether a new hire is the right fit.

That’s where a probation period can help. But what happens when the probation period is about to end and you’re still not sure?

In this guide, we’ll walk you through what extending a probation period can look like in New Zealand, when it may be appropriate, and how to do it in a way that’s fair, documented and legally safer for your business.

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

A probation period is a period at the start of employment where you assess a new employee’s performance, conduct and overall suitability for the role.

In practice, probation periods are often used to:

• check the employee can do the job to the required standard (not just “in theory”)
• confirm the employee is reliable and can meet attendance and punctuality expectations
• assess cultural fit and working relationships
• identify training needs early

However, it’s important not to confuse a probation period with a trial period.

Trial Periods (90-Day Trial) In NZ

A trial period under the Employment Relations Act 2000 can limit an employee’s ability to bring a personal grievance for unjustified dismissal (but only if the trial is validly agreed and the employer is entitled to use it under the current rules).

Key points for employers:

• Trial periods must be agreed in writing and included in the employment agreement.
• The employee must sign the agreement before they start work.
• Trial periods are time-limited (commonly up to 90 days) and only apply if the statutory requirements are met.
• You still have obligations to act fairly and follow a process (it’s not a “free pass” to dismiss casually).

A crucial difference for this article: a “trial period” is tightly regulated, whereas a “probation period” is more of a contractual arrangement focused on performance monitoring and support.

Either way, it starts with having the right documents in place, including a properly drafted Employment Contract.

Can You Do A Probation Period Extension In New Zealand?

Sometimes, yes - but it’s not as simple as telling the employee “we’re extending your probation for another month”. Extending probation should be handled like any other change to terms of employment: it generally requires communication, genuine reasons, and agreement.

Here’s the key principle: you usually can’t unilaterally extend probation if the employee doesn’t agree (unless your employment agreement very clearly allows for it, and even then you still need to act fairly and in good faith).

A probation period extension is most likely to be appropriate when:

• you’ve identified performance issues, but the employee is showing improvement and you want to give them a fair chance
• the employee hasn’t had a genuine opportunity to demonstrate their performance due to factors like delayed training, seasonal workflow, or extended sick leave
• you’ve been actively providing feedback and support, but you need more time to assess whether the improvements will stick

On the other hand, a probation period extension can become risky if it looks like you’re:

• using probation as an indefinite “wait and see” period
• trying to avoid making a decision about confirming employment
• setting unclear expectations (so the employee can’t realistically meet them)
• trying to “extend” a trial period beyond what the law allows

If what you actually have is a trial period, you should be very cautious. In most cases, a 90-day trial can’t be extended - and even if you and the employee “agree” to extra time, that doesn’t usually preserve the legal protections of a valid trial period beyond the statutory limits. Get advice before attempting any change.

How To Extend A Probation Period Legally (A Practical Step-By-Step)

If you’re considering a probation period extension, the goal is to handle it transparently and procedurally - so the employee understands what’s happening, why it’s happening, and what they need to do next.

1) Check Your Employment Agreement First

Start by reviewing what the employment agreement actually says about probation, performance review timelines, and any ability to vary terms.

If your agreement is vague (or you’ve been using a generic template), that’s a common source of disputes later. This is also where a clean, written Contract amendment can make a huge difference, because it records what both sides agreed to and when.

2) Act Early (Before The Probation Period Ends)

If you’re going to propose a probation period extension, do it before the original probation expires.

Leaving it until the last day (or worse, after the end date) can create confusion about whether the probation is still valid at all. It can also make the extension look like an afterthought rather than a genuine, good-faith management step.

3) Identify The Genuine Reason For The Extension

Be clear with yourself (and your records) about why you need more time.

For example:

• Performance is inconsistent: they meet the standard sometimes but not reliably.
• Training wasn’t completed: they haven’t been given proper tools, systems access, or time with a supervisor.
• Role expectations changed: your business changed direction after they started, and you’ve had to adjust duties.

Vague reasons like “not sure if it’s working out” are much harder to defend if things later end in a dispute.

4) Meet With The Employee And Give Them A Real Opportunity To Respond

In New Zealand, employers must deal with employees in good faith under the Employment Relations Act 2000. Practically, this means you should communicate openly and not surprise the employee with decisions that affect their job.

In your meeting, you’ll usually want to cover:

• what concerns you’ve identified
• what feedback has already been provided
• what “meeting the standard” looks like in practical terms
• what support you’ll provide during the extension
• how long the extension will be
• when you’ll review progress

It’s also wise to give the employee a chance to have a support person present (even if not strictly required in every situation). It can help show your process is fair.

5) Put The Extension In Writing

If the employee agrees, confirm the probation period extension in writing.

Usually, your written document should include:

• the original probation end date
• the new probation end date
• the specific performance areas to improve
• the support/training you will provide
• how and when performance will be reviewed
• what could happen if required improvement is not achieved (without making threats or pre-judging the outcome)

This is also a good time to make sure your broader employment paperwork is consistent, including policies, role descriptions, and any performance management framework.

6) Follow Through With Support And Documented Check-Ins

A probation extension is not just “more time”. It should be a structured period where you’re actively managing performance.

That often means:

• weekly or fortnightly check-ins
• written notes of what was discussed and agreed
• additional training or supervised shifts
• clear targets for quality, output, customer service, or compliance

If you need a more formal pathway, it may be time to use a proper Performance management process that matches the situation and risk level.

How To Manage Risk If Performance Still Isn’t Meeting The Standard

A lot of small businesses extend probation because they want to do the right thing - they don’t want to move too fast, and they want to give the employee a fair shot.

But you also need to protect your business. If the employee still isn’t meeting expectations by the end of the extension, you should avoid treating termination as “automatic”.

Even during probation, you generally still need a fair reason and fair process before termination. If dismissal becomes likely, your steps should be deliberate and well-documented.

What A Fair Process Usually Includes

• Clear communication: the employee must understand the concerns and what improvement is required.
• Support and reasonable time: especially if skills can be learned with training.
• A chance to respond: before final decisions are made.
• Consideration of alternatives: depending on the role and your business (for example, additional training, adjusted duties, or redeployment).
• Written confirmation: of outcomes and reasons.

If you’re unsure about the safest way to approach the end of an extended probation period, it’s worth getting advice early. It’s often much easier (and cheaper) to set the process up correctly from day one than to try to fix it after a complaint is raised.

For example, depending on the situation, you may need tailored advice on How to terminate an employee in a way that reduces the risk of an unjustified dismissal claim.

Think About The Wider Relationship, Not Just The Legal Checkboxes

In a small team, one underperforming role can have a big flow-on effect: missed deadlines, more pressure on other staff, customer complaints, and burnout for you as the owner.

A well-run probation period extension can help you make a confident decision either way - because you’ve given the employee a genuine chance, and you’ve gathered the information you need.

Common Mistakes Employers Make With Probation Period Extensions

Most issues we see aren’t caused by “bad intentions”. They’re caused by busy business owners trying to juggle operations, staffing, and customers - and leaving the legal process to the last minute.

Here are some common mistakes to avoid when you’re considering a probation period extension.

Extending Without Agreement

If the employee doesn’t agree to the extension, trying to impose it can create legal risk and damage trust quickly. Where possible, treat it as a proposal, not a directive.

Using An Extension Instead Of Managing Performance

An extension won’t help if you’re not providing feedback and support. If you’re not holding regular check-ins or explaining the standard required, the employee can later argue they weren’t given a fair opportunity to improve.

Keeping Expectations Vague

“Be more proactive” or “improve your attitude” can be genuine issues, but they need to be translated into observable expectations.

For example:

• respond to customer enquiries within X hours
• follow the checklist process on every job
• arrive ready to start at rostered times
• communicate delays to the supervisor before the shift starts

Confusing A Trial Period With A Probation Period

This one is a biggie. If your agreement says “trial period” and you’re relying on those legal protections, the setup requirements are strict. If your agreement says “probation” but you treat it like a trial, you can also run into problems.

If you’re not sure what you have in place (or whether it was set up properly), a quick check with an Employment Lawyer can save you a lot of stress later.

Not Updating Documents Properly

A probation period extension should be recorded in writing, and you should ensure it aligns with your existing employment agreement terms.

If the relationship ends and you don’t have a clear paper trail, you’ll be stuck trying to reconstruct what happened from memory, roster records, and scattered messages - which is not where you want to be if there’s a personal grievance.

In higher-risk situations (or where you’re likely to move toward termination), properly prepared Termination documents can help make sure you’re communicating outcomes clearly and consistently.

Key Takeaways

• A probation period extension can be a practical option when you need more time to assess performance, but it should be handled carefully and in good faith.
• Start by checking what your employment agreement says, and make sure your approach matches whether it’s a probation period or a trial period.
• Raise the extension before the probation period ends, and communicate the genuine reasons for needing more time.
• Put the extension in writing, including the new end date, what improvement is required, what support you’ll provide, and how review meetings will work.
• During the extension, follow through with regular feedback, support, and documented check-ins - otherwise the extension won’t reduce your risk.
• If performance doesn’t improve, avoid treating dismissal as “automatic” and make sure you follow a fair process.
• If you’re uncertain, getting tailored advice early can help you avoid costly disputes and protect your business from day one.

If you’d like help reviewing your probation clause, preparing a probation period extension letter, or managing a performance process, you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.