How 90-Day Trial Periods Work for Employers in New Zealand

If you are hiring in New Zealand and plan to rely on a 90 day clause NZ employers often use, the details matter. Many businesses assume a trial period can be added to any contract, think it can be agreed after the employee starts, or treat it like a general protection against any unfair dismissal claim. Those are the mistakes that usually cause trouble.

A 90 day trial period only works if the legal requirements are met exactly, and timing is one of the biggest pressure points. If the wording is wrong, the employee has already started work, or the clause is used in the wrong circumstances, the employer may lose the benefit of the trial period altogether.

This guide explains what a 90 day clause means in New Zealand, when you can use it, what must appear in the employment agreement, and the common drafting and process mistakes to avoid before you hire your first worker or before you sign a new employment contract.

Overview

A valid 90 day trial period can limit an employee's ability to bring a personal grievance for dismissal, but only if the clause is included properly in a written employment agreement and agreed before the employee begins work. It is not a shortcut around fair process, and it does not remove every employment law obligation.

• The trial period must be in a signed written employment agreement.
• The employee must not have previously been employed by the business.
• The agreement must be signed before the employee starts work.
• The clause needs clear wording about the trial period and notice of termination.
• The employer still needs to act in good faith and follow the rest of employment law.

What 90 Day Clause NZ Means For New Zealand Businesses

A 90 day clause in New Zealand is a contractual trial period that can apply to a new employee for up to 90 days from the start of their employment. If the clause is valid and used correctly, the employee generally cannot bring a personal grievance or legal proceedings in respect of their dismissal during the trial period.

That sounds simple, but business owners often hear only the headline. The legal effect is narrower than many people expect.

What a trial period is designed to do

A trial period gives an employer some room to assess whether a new hire is the right fit, especially where there is uncertainty around capability, attendance, reliability, customer handling, or whether the role suits the person's skills in practice.

For a small business, this often comes up when:

• you are hiring your first employee and cannot carry a poor fit for long
• you need someone to step into a customer-facing role quickly
• the job looks straightforward on paper, but actual performance is hard to judge until work begins
• you are growing fast and cannot afford a lengthy recruitment mistake

The main benefit is reduced dismissal risk during that initial period, but only for dismissal-related personal grievance claims covered by the trial period rules.

What a trial period does not do

A valid 90 day clause is not a free pass to ignore process or basic employer obligations. It does not let a business discriminate, retaliate, mislead staff, ignore wages and leave obligations, or act in bad faith.

Even during a trial period, employers still need to comply with core employment duties, including:

• acting in good faith
• paying wages correctly and on time
• keeping proper employment records
• meeting minimum employment standards
• providing a safe workplace
• following the employment agreement terms

This is where founders often get caught. They hear that a 90 day clause lets them dismiss without the usual personal grievance exposure, then assume no process matters at all. That assumption can create risk in other parts of the employment relationship.

Who can use a 90 day trial period

A 90 day trial period is generally available for a genuine new employee who has not worked for the employer before. The employee must agree to the trial period as part of their written employment agreement before they start work.

If someone has already started, even for training, shadowing, induction, or a paid trial shift, the employer may no longer be able to rely on the trial period. Timing is critical.

This is especially relevant where a founder makes a quick verbal offer, asks the person to come in on Monday, and plans to tidy up the paperwork later. If the agreement is signed after work begins, the trial period may fail.

Trial period versus probationary period

A trial period and a probationary period are not the same thing. A probationary period can still be useful, but it does not remove an employee's ability to raise a personal grievance for dismissal.

In practical terms:

• a trial period can limit dismissal grievances if all legal requirements are met
• a probation period is more about setting expectations, reviewing performance, and confirming suitability
• both should be clearly drafted in the employment agreement
• using the wrong label, or mixing the two concepts, can create confusion and disputes

If your agreement refers casually to both without clear wording, you may end up with a clause that does not do what you think it does.

Legal Issues To Check Before You Sign

The safest approach is to treat the 90 day clause as a technical contract provision that must be handled correctly from the first offer. Before you sign a contract or send an offer letter, make sure the process and drafting line up.

The clause must be in writing

The trial period needs to be included in a written employment agreement. A verbal discussion is not enough, and a vague statement that the employee will be on trial does not give reliable protection.

The agreement should state clearly:

• that the employee is subject to a trial period
• the length of the trial period, up to 90 days
• that the employee may be dismissed during that period
• the notice the employer will give if ending employment during the trial period

Clear drafting matters because employment disputes often turn on exact wording, not what the employer meant.

The employee must sign before starting work

This is one of the most important legal requirements. The employee must sign the employment agreement containing the trial period before they start work.

That means before they do any real work, attend induction as an employee, complete paid training, or begin performing the role. Leaving the contract unsigned until day one, or getting a signature after the first shift, is a common error.

Before you hire your first worker, set up a process that covers:

• issuing the proposed agreement early
• giving the candidate a real opportunity to review it
• encouraging them to seek independent advice if they want to
• receiving the signed agreement before the start date
• keeping a dated copy on file

The employee must be a new employee

A trial period is generally intended for someone who has not previously been employed by your business. If you are rehiring someone, converting a casual relationship that may already amount to employment, or treating prior work as unofficial, you need to look closely at whether the person is truly a new employee.

This issue often appears where:

• a founder has used a friend for ad hoc paid work and then wants to hire them formally
• a contractor may in reality have been working like an employee
• a former employee returns after a break
• someone completed paid work before the formal start date

Before you classify someone as a contractor, or before you later move them into employment, make sure the legal status is clear. A misclassified worker can create more than one problem at once.

You still need good faith and a sensible process

Even with a valid trial clause, employers should not treat dismissal during the 90 days as casual or abrupt. The law does not require the full ordinary unjustified dismissal framework in the same way, but good faith still applies.

In practice, sensible steps usually include:

• raising concerns early
• giving feedback during the trial period
• keeping notes of performance or conduct issues
• avoiding surprise decisions where possible
• giving the contractual notice required by the agreement

This is not just about legal exposure. It also helps protect team culture and reduces the chance of disputes over what happened.

Check the rest of the employment agreement too

The trial period is only one part of the contract. Before you sign, make sure the wider agreement is fit for the role and your business.

Important terms often include:

• job title and duties
• hours of work and availability expectations
• pay, deductions, and timing of payment
• leave entitlements
• confidentiality and intellectual property
• restraint clauses, if genuinely needed and carefully drafted
• notice periods after the trial period ends
• disciplinary and workplace policy references

A weak employment agreement can cause problems well beyond the trial clause, especially once the first 90 days are over.

Common Mistakes With 90 Day Clause NZ

The biggest mistakes with 90 day clause NZ drafting are usually timing mistakes, wording mistakes, and overconfidence about what the clause protects. Most disputes come from avoidable process failures rather than complex legal theory.

Letting the employee start before the paperwork is complete

This is the classic problem. A business needs someone urgently, agrees the main terms by phone, and lets the new hire begin while the contract is still sitting in an inbox. Later, the employer sends the agreement with a 90 day trial clause and assumes that is enough.

Usually, it is not. If the employee has already started, the trial period may be invalid.

Before you spend money on setup, uniforms, onboarding, or training, make sure the signed agreement is back first.

Using a copied clause that does not fit New Zealand law

Some businesses lift wording from an old contract, an Australian template, or a document downloaded years ago. That can be risky because the clause may not reflect current New Zealand requirements or may miss critical details.

Common drafting flaws include:

• not stating the length of the trial period clearly
• not dealing properly with notice of termination
• using inconsistent terms elsewhere in the agreement
• mixing probation language with trial period language
• describing the worker in a way that creates status confusion

If you are relying on the clause, it needs to be drafted for the actual role and the way your business hires.

Treating contractors like employees, then adding a trial period later

Founders often test a person informally first, calling them a contractor, then move them into a permanent role with a trial period. The risk is that the person may already have been an employee in substance, regardless of the label used.

Courts and authorities look at the real nature of the relationship, not just what the contract says. If the earlier arrangement looked like employment, the worker may not be a new employee for trial period purposes.

This is one reason worker status should be sorted out early, before you rely on a verbal promise or a simple invoice arrangement.

Assuming the trial period removes all legal risk

A trial period does not erase all claims. Employers can still face issues around discrimination, wage compliance, holidays and leave, health and safety, recordkeeping, and other contractual or statutory obligations.

The main risk is not only whether dismissal itself is challengeable. It is also whether the wider employment relationship was handled lawfully and fairly.

Giving poor feedback and keeping no records

Some employers say nothing during the 90 days, then dismiss the employee near the end of the period with no prior discussion. That can create conflict, damage morale, and make the business look disorganised.

A better approach is to set review points early. For example:

• week 1, confirm role expectations and training needs
• week 3 or 4, discuss performance and any concerns
• midpoint, record progress and identify gaps
• before the end of the trial period, decide whether employment will continue

Short written notes can be useful. They do not need to be elaborate, but they should reflect what was discussed and when.

Forgetting the notice requirement

If your agreement says one week's notice applies during the trial period, you need to give that notice according to the contract. The right to dismiss during a trial period is still exercised through the contract terms.

Check the agreement carefully before acting. A rushed termination that ignores the notice clause can create a separate contractual issue.

Missing the end date

A 90 day trial period is time-limited. If the business wants to end employment under the trial clause, it needs to do so within the contractual trial period and according to the agreement terms.

Do not assume you can make the decision on day 89 and sort out the paperwork later. Keep a clear record of the employee's start date, the last day of the trial period, and when notice must be given.

FAQs

Can any New Zealand employer use a 90 day trial period?

A business can generally use one for a genuine new employee if the legal requirements are met, especially that the clause is in a written agreement signed before work starts. It is not available simply because the employer wants extra flexibility.

Can an employee challenge a dismissal during a valid 90 day trial period?

A valid trial period generally prevents a personal grievance or legal proceedings in respect of the dismissal itself. That does not remove every possible employment claim, and the employer still needs to comply with other legal obligations.

Is a probation period the same as a 90 day clause?

No. A probation period can help manage performance expectations, but it does not give the same dismissal protection to the employer as a properly drafted and valid trial period.

What happens if the employee signs after their first day?

The employer may not be able to rely on the trial period. This is one of the most common reasons a 90 day clause fails.

Can I use a 90 day trial clause for someone who already worked for me casually?

Possibly not. If the person has already been employed by the business, or the earlier arrangement may really have been employment, the trial period may be ineffective. The exact status and history matter.

Key Takeaways

• A 90 day clause in New Zealand only works if it is included in a signed written employment agreement before the employee starts work.
• The employee generally needs to be a genuine new employee who has not already worked for the business as an employee.
• A valid trial period can limit dismissal-related personal grievance claims, but it does not remove other employment law duties.
• Good drafting matters, especially around the trial period wording, notice requirements, and consistency with the rest of the employment agreement.
• Founders most often get caught by late signatures, copied templates, unclear worker status, and poor internal hiring processes.
• It is worth reviewing both the clause and the wider employment contract before you sign, particularly if you are hiring your first worker or using a standard form across multiple roles.

If you want help with employment agreement drafting, trial period wording, worker classification, contract review, and termination process issues, you can reach us on 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.