When You Can Lawfully Change an Employee’s Job

As a small business owner, you don’t always have the luxury of keeping roles “as is”. Workflows change, new systems get introduced, customer demand shifts, and sometimes you simply need your team to pitch in somewhere new.

That’s where the tricky question comes in: can you change an employee’s job description without getting yourself into legal hot water?

In New Zealand, changing an employee’s job description can be lawful, but it depends on what you’re changing, how you’re doing it, and whether the change is minor or effectively a new role. The key theme under NZ employment law is that you can’t just “announce” a significant change and expect it to stick. Most meaningful changes need consultation, and often a formal variation to the employment agreement.

Below, we’ll walk through how to approach role changes in a practical, legally safer way (without slowing your business down more than necessary).

Why Job Descriptions Matter (And Why “Just Updating It” Can Be Risky)

A job description often feels like an internal document you can update whenever you like. But in reality, job descriptions have legal weight because they’re usually connected to the employee’s employment agreement and their overall terms and conditions.

Even if the job description isn’t physically attached to the employment agreement, it often:

sets expectations about duties, responsibilities, and reporting lines
supports performance management discussions (what “good performance” actually looks like)
helps determine whether a request is “reasonable” within the scope of the role
influences pay and seniority decisions (especially where duties shift over time)

In New Zealand, employment relationships are governed heavily by the Employment Relations Act 2000 (including the duty of good faith). Good faith is about being communicative and not misleading, and it’s especially important when you’re making changes that affect someone’s job.

As a general rule: the bigger the change, the more process you need.

When Changing An Employee’s Job Description May Be Lawful Without A Formal Variation

Not every tweak requires a signed variation. In many workplaces, it’s normal for duties to evolve slightly over time. The key is whether the change is within the reasonable scope of the role and consistent with what the employee agreed to when they took the job (including what the employment agreement says, and how the role has operated in practice).

1) Minor Duty Changes That Are Within The Role’s Scope

If your employee is already employed, for example, as an “administration assistant”, then adding a few additional admin tasks (that are consistent with admin work) will often be workable.

Examples of generally minor changes:

switching between similar tasks (e.g. invoicing now done weekly instead of daily)
introducing a new software tool to do the same work
adjusting internal processes (e.g. new checklists, new reporting templates)
reallocating a small percentage of duties within the same job family

Even where it’s “minor”, it’s still smart to communicate clearly and keep a record of the updated job description. The goal is to avoid misunderstandings later (for example, in a performance process or dispute).

2) Using Flexibility Clauses (But Not As A Shortcut)

Some employment agreements have wording like “the employee may be required to perform other duties reasonably within their skills and experience.” Clauses like this can help, but they’re not a blank cheque.

A flexibility clause won’t usually justify:

a drop in seniority
a significant change in role type (e.g. moving from customer service to sales targets/commission)
a major increase in responsibility without appropriate pay review
a change that makes the job materially different from what was agreed

If you’re unsure whether the clause really covers the change, get advice before you rely on it. A well-drafted Employment Contract is often what makes these situations clearer from day one.

3) Temporary Changes By Agreement

Sometimes you need a short-term change (covering leave, seasonal demand, a big contract). Temporary changes can be lawful if you approach them as a conversation and get agreement, ideally in writing.

This is especially important if the temporary change affects hours, duties, location, or pay.

When You Need Consultation And A Formal Variation (And What “Significant” Really Means)

Where role changes are more substantial, you’ll usually need to consult and often agree to a formal variation to the employee’s terms and conditions.

In practical terms, you’re in “significant change” territory if the change affects:

pay (base rate, commission structure, allowances)
hours of work (e.g. moving from day shifts to nights, or reducing guaranteed hours)
location (e.g. moving sites, requiring travel, changing remote/in-office expectations)
seniority and reporting lines (new manager, loss of leadership responsibilities)
core purpose of the job (the “main thing” they were hired to do)

Role Changes Can Be Treated As A Contract Change

In NZ, most employees’ key terms are governed by their employment agreement. If your proposed changes alter the “real substance” of the agreement, you can’t unilaterally impose them.

Trying to force changes can expose you to claims such as:

unjustified disadvantage (where the employee is negatively affected without proper basis and process)
constructive dismissal risk (if the change is so significant the employee feels they have no real choice but to resign)
personal grievance processes and costs that can quickly outweigh the “benefit” of the change

If The Change Is Actually A Restructure, Treat It Like One

Sometimes “changing the job description” is really code for: “we don’t need this role in its current form anymore”. If that’s the situation, you may be in restructure/redundancy territory, and you need to follow a fair process.

If you’re considering this path, it’s worth getting guidance early through Redundancy Advice, because the process (consultation, genuine reasons, consideration of alternatives) matters just as much as the outcome.

How To Change An Employee’s Job Description The Right Way (A Practical Step-By-Step)

If you want to change an employee’s job description lawfully, the safest approach is to treat it as a process, not a memo.

Step 1: Check The Employment Agreement And Current Job Description

Start by reviewing:

the employee’s current position title and duties
any flexibility clauses
hours, location, and reporting obligations
any policies that tie into the role (for example, confidentiality or conflicts)

Also check what’s happened in practice. Even if a contract says one thing, a long-standing “real life” arrangement can matter (for example, if someone has effectively been doing a higher-level role for a long time).

Step 2: Identify Whether The Change Is Minor Or Substantial

Ask yourself:

Is this change within the employee’s current skill set?
Does it add new responsibilities with higher risk?
Does it reduce their status, pay, or certainty?
Would a reasonable person say it’s the same job, or a different job?

If it’s even borderline, it’s usually better to consult properly than to rush it.

Step 3: Prepare A Clear Written Proposal

Good faith consultation works best when the employee can actually understand what’s being proposed.

Your proposal should cover:

what is changing (duties, reporting line, title, hours, etc.)
why the business is proposing the change (commercial reasons, workflow, customer demand)
when it would start
what stays the same (if pay, hours, or location aren’t changing, say so)
any support/training you’ll provide

Step 4: Consult (And Give A Genuine Opportunity To Respond)

Consultation doesn’t mean the employee gets to veto everything. But it does mean you must approach the discussion with an open mind.

Practically, this includes:

meeting with the employee to talk through the proposal
allowing them time to consider it
inviting feedback and questions
considering their feedback genuinely (and documenting your thinking)

If the change is connected to performance issues, be careful not to disguise performance management as a “role change”. In those cases, a structured process is usually safer, and a Performance Management Process can help you avoid mixing issues and increasing risk.

Step 5: Confirm The Outcome In Writing

If you reach agreement, record it properly. Depending on what’s changing, that could be:

an updated job description acknowledged in writing, and/or
a formal variation letter or new agreement

Be specific about start dates and any review or check-in points you’ve agreed for the transition. If training is required, document what support will be provided.

Step 6: Implement Carefully (And Keep Reviewing)

Once implemented:

set realistic expectations for the transition period
check in early and often
keep notes of key discussions
update internal systems (org charts, KPIs, delegations, access permissions)

This is also a good time to review any supporting workplace rules. For example, if a new role includes client relationship responsibility or access to sensitive commercial info, it may be worth updating your Conflict Of Interest Policy expectations at the same time.

Common Small Business Scenarios (And How To Handle Them)

Role changes rarely happen in a neat textbook way. Here are some of the most common real-world situations we see in small businesses.

Changing Duties Because You’re Growing (Or Tightening Costs)

If you’re scaling up, roles often become more specialised. If you’re tightening costs, roles often become broader.

The legal risk usually appears when the employee experiences the change as a loss:

less certainty (hours cut, fewer guaranteed shifts)
less seniority (loss of leadership or specialist work)
less earning potential

If hours are changing, be careful: reducing guaranteed hours or changing work patterns can require agreement. If you’re considering reduced hours as part of a wider change, Reducing Staff Hours is a helpful starting point for understanding the risk areas.

Changing A Role After Introducing New Tech Or Systems

Implementing new systems can change day-to-day tasks. Often this is fine, but watch for situations where tech changes the job’s nature (for example, a role becomes heavily sales-driven, compliance-heavy, or requires new qualifications).

Also, if the new system introduces monitoring, recording, or surveillance features, remember that privacy and transparency matter. (Even if it’s not the main topic here, workplace changes and data handling often go hand-in-hand.)

Temporarily Changing A Role During Downtime Or Business Disruption

If you have a slowdown and want employees to do alternative work temporarily, the safest path is agreement in writing, including duration and what happens after the period ends.

If there’s not enough work at all, you might be considering options like agreed reduced hours, annual leave, or (in some cases) a restructure. “Stand down” situations can be especially risky if handled informally or without a clear contractual/legal basis, so it’s worth checking your position before acting. Employee Stand Down issues often overlap with role change discussions in practice.

Changing A Role Because The Employee Isn’t Performing

It’s tempting to “change the job” to work around performance problems (for example, remove responsibilities or shuffle someone sideways). But if the employee experiences it as a demotion or punishment, it can quickly turn into a dispute.

If performance is the real issue, it’s usually better to address performance directly through a fair process rather than using job description changes as a workaround.

If The Employee Won’t Agree To The New Job Description

This is where things can get delicate.

If the proposed change is substantial and the employee doesn’t agree, you generally can’t force it. Your options depend on the situation and might include:

negotiating a compromise (partial change, additional pay, training, phased transition)
keeping the role as-is if the business can accommodate it
if the role genuinely can’t continue in its current form, exploring a lawful restructure process

If you end up needing to terminate employment due to the wider change (for example, redundancy), you also need to handle notice and final entitlements correctly. In some cases, Payment In Lieu Of Notice might be relevant, but only if done properly and consistent with the agreement.

Key Takeaways

Changing an employee’s job description can be lawful in New Zealand, but the legal risk depends on whether the change is minor (within scope) or substantial (changing the real nature of the role).
Minor duty updates are often manageable through clear communication and an updated job description, but major changes typically require consultation and agreement, often documented as a formal variation.
The duty of good faith under the Employment Relations Act 2000 means you should be open, communicative, and genuinely consider feedback when proposing role changes.
If the “job description change” is really a restructure (because the business no longer needs the role in its current form), you’ll usually need to follow a fair process and carefully manage redundancy risks.
Be especially cautious where changes impact pay, hours, location, seniority, or the core purpose of the job-these are the areas most likely to trigger disputes.
Document the outcome properly (updated job description, variation letter, or new agreement) so expectations are clear and your business is protected long-term.

If you’d like help changing an employee’s job description or navigating a restructure, you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.

When You Can Lawfully Change an Employee’s Job Description in New Zealand