How To Change An Employee From Full-Time To Part-Time In NZ

Businesses change pace. Sometimes you lose a key client, sometimes you pick up seasonal work, and sometimes you’re simply reshaping your team to stay sustainable.

Whatever the reason, moving an employee from full-time to part-time usually isn’t something you can “just implement” because it suits rosters or budgets. In New Zealand, it will often involve a variation to the employee’s terms of employment – and that means you need to handle it carefully, in good faith, and (in many cases) with the employee’s agreement.

This guide walks you through what you can and can’t do, the common legal risks, and a practical process you can follow so you stay compliant and protect the working relationship.

Is Changing An Employee From Full-Time To Part-Time A Contract Change?

In most cases, yes. An employee’s full-time or part-time status is usually tied to their agreed hours of work and often their days of work, pay arrangements, overtime expectations, and availability requirements.

Because these terms are usually set out in the employment agreement, changing them is generally a variation of the employment agreement. Under the Employment Relations Act 2000, employers and employees must deal with each other in good faith – which includes being open and communicative, not misleading each other, and giving genuine consideration to proposals that affect the employee’s employment.

What This Means In Practice

• You usually can’t unilaterally reduce agreed hours just because the business needs change.
• You will often need the employee’s consent to move from full-time to part-time. In some cases, an employment agreement may allow changes to hours – but any flexibility still needs to be exercised lawfully, reasonably, and in good faith.
• If you push changes through without proper process, you can increase the risk of a personal grievance (for example, for unjustified disadvantage or constructive dismissal).

It’s also a good moment to review whether the role is still fit-for-purpose and whether the employee’s Employment Contract clearly reflects what you actually need in the business now (hours, flexibility, availability, duties, and pay structure).

When Can You Change Full-Time To Part-Time (And When Can’t You)?

There are a few common scenarios where employers consider changing a role to part-time. Some are straightforward. Others are legally higher-risk.

Lower-Risk Scenarios

• The employee asks for it (for example, due to family commitments, study, or health).
• Mutual agreement after a genuine discussion, where the employee has time to consider the proposal and can respond freely.
• Trial arrangements (agreed in writing) where both sides are clear about the duration, review points, and what happens at the end.

Higher-Risk Scenarios

• You’re reducing hours to cut costs because the business is slow.
• You’re changing the role structure (for example, splitting one full-time role into two part-time roles).
• The employee doesn’t agree, but you want to proceed anyway.

If the real driver is that you no longer need (or can no longer afford) a full-time position, you may be moving into restructure/redundancy territory rather than a simple change of hours. In those cases, you’ll want to tread carefully and consider getting advice early – including whether a redundancy advice process is more appropriate than “offering part-time” as a fait accompli.

For more context on hours changes generally, it’s also worth reading about reducing staff hours, because the legal risks often come from skipping consultation or assuming flexibility you don’t actually have under the agreement.

A Practical, Good-Faith Process Employers Can Follow

If you want to change an employee from full-time to part-time, a clear, respectful process is your best protection. It also gives you the best chance of reaching a workable outcome without damaging morale.

1) Check The Employment Agreement First

Start with the basics:

• What hours are guaranteed (if any)?
• Is there a flexibility clause about hours/days of work?
• Are there consultation clauses or a change process set out?
• Is the employee covered by a collective agreement (if so, it may set minimum hours and variation processes)?

Be careful with flexibility clauses. Even if your contract says you can vary hours, you still need to exercise any discretion reasonably and in good faith. A clause that tries to give you absolute power to cut hours at any time can be risky in practice (and may not protect you if challenged).

2) Be Clear On The “Why” (And Document It)

Employees are far more likely to engage constructively if they understand the genuine business reason. Be transparent, but professional.

For example, you might explain:

• a sustained reduction in demand
• loss of a contract or client
• changes in opening hours
• automation or process changes

If the issue is temporary, say that. If it’s ongoing, be honest about that too. Vague explanations tend to create mistrust and can undermine the process if a dispute arises later.

3) Make A Proposal (Not A Decision)

Frame your approach as a proposal you’re consulting on, not something you’re imposing.

Your proposal should cover:

• the proposed new hours (and days)
• the proposed start date
• any pay impact (the hourly rate will usually stay the same, but total earnings change)
• how leave will work going forward
• how you’ll manage workload/handovers
• any alternative options you’re open to (for example, compressed hours, different shifts, job share)

4) Consult Properly And Give Time To Respond

Consultation isn’t a box-ticking exercise. It means you:

• give the employee relevant information
• give them a genuine opportunity to comment
• consider their feedback with an open mind
• respond before making a final decision

It’s also good practice to encourage the employee to get independent advice (for example, from a support person, advocate, or lawyer), especially if the change is significant.

5) Confirm The Outcome In Writing

If the employee agrees, confirm the updated terms in writing. Depending on how your documents are structured, that might be:

• a signed letter of variation, or
• a new employment agreement replacing the old one

Either way, the key is that it’s clear, current, and signed. If you’re updating broader terms at the same time (for example, duties, reporting line, or remuneration structure), it may be cleaner to issue an updated agreement rather than patching multiple variations.

Where you’re updating your documentation, it can help to have the changes reflected properly in your Employment Contract framework so your future hires (and current team) have consistent, compliant terms.

Key Legal Issues To Watch: Pay, Leave, Breaks, And Entitlements

One common mistake employers make is thinking “part-time” changes the employee’s legal entitlements. Usually, it doesn’t – it just changes how those entitlements are calculated (based on the employee’s new work pattern).

Minimum Pay And Records

Your employee must still receive at least the applicable minimum wage under the Minimum Wage Act 1983. You’ll also need to keep accurate wage and time records, especially if hours vary week to week.

Holidays And Leave (Holidays Act 2003)

Under the Holidays Act 2003:

• Annual leave is still at least 4 weeks per year – but “a week” is based on the employee’s working week.
• Sick leave entitlements still apply (subject to eligibility rules), and payment is based on relevant daily pay/average daily pay.
• Public holiday entitlements depend on whether the day would otherwise be a working day for the employee.

When someone moves to part-time, the biggest risk area tends to be payroll settings and leave calculations – especially if the employee’s pattern of work changes. If you’re unsure, get payroll support and legal guidance early to avoid backpay issues later.

Rest And Meal Breaks

Break entitlements depend on the length of the work period. If a shift is shortened, break requirements may change – but you still need to provide compliant rest and meal breaks where required.

Health And Safety Obligations Still Apply

Even if an employee works fewer hours, your obligations under the Health and Safety at Work Act 2015 don’t reduce. In fact, changes to hours can create new risks (fatigue, lone work, reduced supervision, different shift patterns), so it’s worth sanity-checking your health and safety approach when you change rosters.

Discrimination And Fair Process

Be mindful of the Human Rights Act 1993. If you’re selecting certain employees to reduce hours, make sure the reasons are objective and not connected to protected grounds (such as sex, family status, disability, or age). Even where your intentions are good, inconsistent treatment can create legal risk.

Privacy And Handling Sensitive Information

If the change is driven by medical information (for example, the employee is reducing hours for health reasons), treat that as sensitive personal information. Your obligations under the Privacy Act 2020 include collecting and storing information safely, using it only for the purpose it was collected, and limiting access internally.

If your business collects and stores staff personal information digitally, it can also be worth reviewing your broader privacy settings and documents, including whether a Privacy Policy is appropriate for the way you handle information across the business.

What If The Employee Doesn’t Agree To Go Part-Time?

This is where many employers get stuck. If an employee refuses a move from full-time to part-time, you generally have three broad pathways – and each has different risk levels.

1) Negotiate Alternatives

Sometimes “part-time” is the headline, but there are other workable options, such as:

• a temporary reduction with a review date
• a different shift pattern that keeps total weekly hours the same
• job share arrangements
• redeployment into another suitable role (if available)

Even if the employee says “no” initially, a genuine back-and-forth discussion can lead to an outcome that suits both sides.

2) Consider A Restructure/Redundancy Process (If The Role Truly Needs To Change)

If the business genuinely no longer requires the role to be full-time, and the employee doesn’t agree to a part-time change, you may need to consider a restructure.

This is not something to rush. A restructure process typically involves:

• providing a clear business rationale
• consulting on a proposal (including proposed new roles/hours)
• considering feedback and alternatives
• assessing redeployment options
• making decisions and confirming outcomes fairly

Handled properly, this can be a legitimate way to transition a business to a new staffing structure. Handled poorly, it can quickly become an unjustified dismissal risk.

If you’re even close to this territory, it’s smart to get tailored advice early – including around consultation steps, documentation, and exit entitlements. This is where Redundancy Documents and a clear process can help you stay consistent and reduce risk.

3) Avoid “Soft Pressure” Or Threats

It can be tempting to say something like, “If you don’t accept part-time, we’ll have to let you go.” Even if that might ultimately be true, that kind of pressure can undermine good-faith consultation and create arguments that the employee was coerced into agreeing.

If a restructure is genuinely on the table, it’s better to explain that honestly as part of a proper proposal and consultation process – not as a threat.

Key Takeaways

• Moving an employee from full-time to part-time is usually a variation to their employment agreement, so you generally need agreement (or a lawful contractual basis) and a good-faith process.
• Check the employment agreement first, then make a proposal (not a decision) and consult properly before finalising any changes.
• If the employee doesn’t agree, you may need to explore alternatives or consider whether a restructure/redundancy process is more appropriate than trying to force a reduction in hours.
• Moving to part-time doesn’t remove legal entitlements – it changes how they’re calculated under the Holidays Act 2003 and other employment laws.
• Put the final arrangement in writing (variation or updated agreement) so expectations are clear and enforceable.
• When the change is sensitive (medical, performance concerns, or cost-cutting), getting tailored advice early can save you a lot of time, cost, and stress later.

If you’d like help moving an employee from full-time to part-time (or reviewing the best process for your situation), you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.