Changing Employment Contracts In New Zealand: What Employers Need To Know

In a small business, change is pretty much constant. Your workload shifts, your opening hours change, you bring in new tech, you restructure teams, or you simply learn (the hard way) that your current employment documents don’t match how your business actually operates.

That’s usually when employers start thinking about updating employment contracts. And it’s a smart move - as long as you handle it properly.

In New Zealand, employment relationships are built on good faith and clear agreements. So if you want to update pay, hours, duties, policies, working location, or anything else in an employment agreement, you’ll generally need to follow a fair process and get the employee’s agreement (and, if a collective agreement applies, follow the requirements in that collective too).

Below, we’ll break down what you can (and can’t) do when changing employment contracts, what “good faith” looks like in practice, and how to protect your business while staying compliant.

When Can An Employer Make Changes To An Employment Contract?

An employment agreement is a contract, which means it’s not something you can usually change unilaterally (even if the change seems reasonable, or even if your business really needs it).

In most cases, changes to an employment contract come up when:

• Your business operations change (new systems, new services, different staffing needs).
• You’re fixing a mismatch between what the agreement says and what’s happening in real life (common with start-ups and growing businesses).
• You’re updating roles and responsibilities as employees become more senior or teams restructure.
• You’re standardising terms across staff (for example, updating template agreements for new hires, or aligning older contracts with current practices).
• You’re responding to legal changes (minimum entitlements, new policies, updated compliance expectations).

The key point is this: you can propose changes at any time, but you normally can’t impose them unless the agreement genuinely gives you that ability for that specific type of change, and you still follow a fair process and act in good faith. A “variation clause” or a general “company may change policies” clause isn’t a free pass to rewrite core terms like pay or guaranteed hours.

If you’re not confident your current documents are fit for purpose, it’s often worth reviewing your Employment Contract templates before you roll out changes - especially if you’ve grown quickly or have a mix of older and newer agreements.

Do Employees Have To Agree To Contract Changes?

Most of the time, yes. If you’re making a change to a term of employment (like pay, guaranteed hours, location, duties, or leave arrangements), it’s usually treated as a variation to the employment agreement.

That variation will generally need the employee’s agreement.

That doesn’t mean employees can “veto” your business decisions, but it does mean you should:

• clearly explain what you’re proposing and why
• give the employee a genuine chance to consider it
• invite feedback and be open to alternatives
• confirm the change in writing once agreed

If the employee doesn’t agree, you can’t simply rewrite the agreement and treat it as done. Trying to do that is a common pathway to a personal grievance risk (and it’s also bad for trust and retention).

If you’re changing terms across a team, make sure you don’t treat consultation as a “tick-the-box” step. In NZ, the duty of good faith is real - and it applies to how you handle negotiations about changes. Also keep in mind that if a collective agreement covers the employee (or you’re bargaining with a union), there may be additional steps or constraints on changing certain terms.

What About “Minor Changes” Or Day-To-Day Adjustments?

Some changes might be operational rather than contractual (for example, adjusting internal processes, changing reporting lines, or tweaking how work is done).

Employers can usually give employees reasonable management instructions within the scope of the role, as long as they’re lawful and consistent with the employment agreement. However, if the change affects something that’s arguably a term of the agreement (like hours, responsibilities, pay structure, or location), it’s safer to treat it as a contract change and go through a proper variation process.

If you’re unsure where the line is, that’s the point to get advice before you roll anything out.

What Does “Good Faith” Mean When Changing Employment Agreements?

In New Zealand, the Employment Relations Act 2000 requires employers and employees to deal with each other in good faith. This is especially important when you’re changing employment contracts, because changes can affect income, job security, and day-to-day work.

In practical terms, good faith usually means:

• Being honest about why you want the change (and not dressing up a restructure as something else).
• Providing relevant information so the employee can properly consider the proposal (for example, how hours will change, how pay will be calculated, when the change takes effect).
• Not misleading or pressuring the employee into signing quickly.
• Allowing time for the employee to get independent advice (including union advice where relevant).
• Genuinely considering feedback and being willing to adjust where reasonable.

Good faith doesn’t mean you must agree with every suggestion, but it does mean you should genuinely engage in the process.

As a practical tip: if you’re proposing a change that impacts multiple people, use a consistent written proposal, invite individual meetings, and document the outcomes. This keeps your process fair and easier to defend later if there’s any dispute.

Common Contract Changes (And The Risks To Watch For)

Most small businesses aren’t trying to make changes for the sake of it - you’re trying to keep the business running sustainably.

Here are some of the most common changes we see, and where employers can get caught out.

1) Changing Hours Or Days Of Work

Changing rosters and availability can be a big deal, especially for staff with caring responsibilities, study, or second jobs.

If you’re reducing hours, you need to be particularly careful. Depending on the circumstances, it can look like you’re changing the agreement without consent or effectively forcing a change that could amount to a form of restructure (especially where hours are guaranteed, or the employee’s take-home pay will drop).

If your business needs to cut hours, it’s worth reading up on reducing staff hours and getting advice early so you can approach it in the right way.

2) Changing Pay Or Pay Structures

Pay changes aren’t just about hourly rates. They can include:

• moving from salary to wages (or vice versa)
• introducing commission, bonuses, or incentive pay
• changing when pay is calculated (for example, average hours vs actual hours)

Even if an employee’s overall pay stays the same, the way it’s structured can materially affect them - so treat it as a genuine contract change and document it carefully.

3) Changing Duties Or Job Titles

In a small team, roles evolve. But significant duty changes can be risky if they:

• materially change seniority or responsibility
• remove core duties (which might look like a demotion)
• add duties outside the role’s reasonable scope

If the change is substantial, this may be more than a “variation” - it might be part of a restructure process. You’ll want to tread carefully and make sure your process is fair.

4) Requiring A Move To Another Work Location Or Working From Home

Relocation clauses can be tricky. If an agreement doesn’t allow for a change of location, you’ll likely need consent.

Also keep in mind that changing location can trigger other obligations (health and safety, equipment, privacy, data security). If you’re formalising remote work, you may also want to align internal policies with your employment documentation and broader working from home obligations.

5) Introducing New Monitoring, Cameras, Or Tracking

If you’re changing workplace rules in a way that affects employee privacy - such as adding surveillance cameras, vehicle tracking, or monitoring computer usage - you should be extra careful.

Even when it’s lawful, it needs to be communicated clearly, used for legitimate purposes, and handled in line with privacy expectations.

It’s worth checking your approach against guidance on cameras in the workplace, and making sure your internal documents reflect what you’re actually doing.

How To Make Changes To Employment Contracts (A Practical Step-By-Step Process)

If you want a process that’s both practical for a time-poor business owner and aligned with NZ employment law, here’s a good framework.

Step 1: Check The Current Agreement And Any Relevant Policies

Start with what’s already in writing. Look for:

• variation clauses (do they exist, and what do they actually allow?)
• job descriptions and “duties as directed” wording (and whether the proposed change still fits within scope)
• hours of work clauses (guaranteed vs flexible)
• remuneration terms (salary, wages, commission, allowances)
• any policies incorporated into the agreement (and whether those policies can be updated without changing the contract)

If a collective agreement applies, check it too - it may set minimum terms, require certain consultation steps, or restrict what can be varied individually.

If you have a separate staff handbook, make sure it aligns too. If your policies are out of date or inconsistent, it can create confusion when you try to implement a change. Many businesses address this by updating their Staff Handbook at the same time.

Step 2: Get Clear On The “Why” (And Make Sure It’s Legitimate)

Before you speak to staff, be clear internally on:

• what problem you’re solving
• what options you considered
• why the change is necessary now
• what impact it will have on the employee

This matters because employees will ask, and your ability to explain it clearly is part of acting in good faith.

Step 3: Put The Proposal In Writing

You don’t need to write an essay, but you should set out:

• what is changing (be specific)
• what is staying the same
• the proposed start date
• any transition arrangements (for example, a phase-in period)
• an invitation for feedback and a meeting

Written proposals reduce misunderstandings and create a clean record of what was communicated.

Step 4: Consult With The Employee (And Give Them Time)

Consultation should be genuine. In practice, that means:

• meet with the employee (or employees) to talk through the proposal
• encourage questions
• consider counterproposals
• give a reasonable timeframe for them to think about it and get advice

If you rush this step, it can undermine the entire change - even if the change itself is reasonable.

Step 5: Confirm The Change In Writing (Variation Letter Or New Agreement)

If the change is agreed, document it properly. Depending on how big the change is, that could be:

• a simple variation letter signed by both parties, or
• a full replacement employment agreement

The important part is that the final document clearly captures the updated terms and doesn’t create contradictions with the old version.

If you’re updating multiple documents (for example, a new role description, new policies, and a new agreement), make sure they all line up. This is one of those moments where getting a lawyer to review things can save you a lot of headaches later.

What If The Employee Says No (Or You Need Change For Business Survival)?

This is the part many employers worry about: what happens if the employee doesn’t agree?

First, don’t panic. A “no” doesn’t necessarily mean the change is dead - it usually means you need to explore alternatives, clarify misunderstandings, or consider whether the change is genuinely required and how to implement it fairly.

Your next steps might include:

• Negotiating a compromise (for example, a trial period, a phased change, or a different roster pattern).
• Assessing whether the change is actually contractual or whether it’s operational and can be implemented through lawful, reasonable management direction within the current role and agreement.
• Checking whether a collective agreement applies (and whether union engagement or additional steps are required).
• Considering a formal restructure process if the role really is changing significantly or the business can’t sustain current arrangements.

If the change involves removing a role, significantly changing a role, or reducing hours in a way that may amount to a restructure, you’ll want to be especially cautious. Poor process here is one of the fastest ways to end up in a costly dispute.

And if you’re ever thinking “we might need to end the employment if they won’t accept the changes”, that’s a big red flag moment to get advice before you take any action. A termination handled incorrectly can quickly turn into a personal grievance.

For businesses that are doing broader organisational changes, it can also help to align employment changes with your wider risk management documents and processes, including a clear Workplace Policy framework.

Key Takeaways

• In NZ, changing an employment contract usually requires the employee’s agreement, especially where the change affects pay, hours, duties, or location (and collective agreements may add extra requirements).
• Employers must act in good faith under the Employment Relations Act 2000, which means being transparent, consulting genuinely, and giving staff time to consider proposals.
• Even when a change seems “minor”, it may still be contractual - so it’s safer to document changes clearly to avoid future disputes.
• Common high-risk changes include reducing hours, changing pay structures, significantly altering duties, relocating work, and introducing workplace monitoring.
• A practical process is to review the current agreement, create a clear written proposal, consult properly, then confirm changes in writing via a variation or new agreement.
• If an employee doesn’t agree, you’ll often need to negotiate, consider whether it’s a lawful operational direction, or (in some cases) run a restructure process - you generally can’t just impose the change.

If you’d like help making changes to employment contracts the right way (or updating your employment documents so they actually match how your business runs), you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.