Secondment Meaning: How It Works In New Zealand Workplaces

If your business is growing (or changing), there’s a good chance you’ll need to move people around to meet demand. Maybe you’ve won a big contract and need extra hands in another team. Maybe someone’s going on parental leave. Or maybe you want to test a restructure without making permanent changes too early.

That’s where a secondment can be a practical option.

But from an employer’s perspective, “simple” internal moves can become messy fast if you don’t get the legal basics right. A secondment can raise questions about pay, duties, reporting lines, health and safety, confidentiality, performance issues, and what happens when the secondment ends.

Below, we break down what a secondment means, how secondment employment arrangements usually work in New Zealand, and what small businesses should document to stay protected from day one.

What Is A Secondment (And What Does Secondment Mean For Employers)?

A secondment is a temporary work arrangement where an employee is assigned to a different role, team, location, or even another organisation for a set period, while generally remaining employed under their original employment relationship.

In practical terms, when someone is seconded, you’re usually saying:

• They’ll perform different duties (or the same duties in a different part of the business) for a period of time; and
• At the end of the secondment, they’ll return to their original role (or another agreed role), unless you agree otherwise.

For a small business, secondments are often used to:

• Cover a temporary vacancy (e.g. parental leave, long-term sick leave, extended annual leave);
• Support a project or peak workload in another part of the business;
• Develop staff skills and leadership capability;
• Trial a change in structure or role design without immediately making a permanent variation;
• Support a client secondment (where your employee works at a client site under agreed conditions).

It’s worth being clear on terminology, because people use it loosely. A “secondment” isn’t just a change of tasks for a day or two. It’s typically a defined, temporary assignment with an expected end date (or end event), and it should be documented properly.

How Does A Secondment Work In NZ Workplaces?

There’s no single “secondment law” in New Zealand that sets out a one-size-fits-all process. Instead, secondment arrangements are usually managed under general employment law principles, including good faith obligations, and your contractual documents.

As a general rule, if a secondment involves a material change to an employee’s role (for example, duties, pay, hours, seniority, or location), you should consult with the employee and document the change as an agreed variation, rather than treating it as an informal direction.

At a high level, here’s how secondments tend to work in NZ:

1) You Start With The Existing Employment Relationship

Most of the time, a seconded employee remains employed by their original employer. That means the existing Employment Contract still matters.

If your employment agreement includes flexibility clauses (like mobility, change of duties, or secondment clauses), you may have a clearer pathway to implement a secondment.

But even then, you should be careful: significant changes to duties, pay, hours, or location often still require consultation and agreement.

2) You Temporarily Vary Duties/Reporting Lines (Often With A Secondment Letter)

Most employers document secondments using a secondment letter or variation letter that sits alongside the employment agreement. This letter should set out the “rules of the road” for the secondment period.

For example, you might confirm that the employee is seconded to another role, that they report to a different manager day-to-day, and that their duties (and possibly hours) are changing for a defined timeframe.

3) You Manage Day-To-Day Supervision And Health & Safety

Even where the employment relationship stays the same, supervision often shifts. That’s where small businesses can get caught out: the original manager assumes the host team is handling performance and safety, and the host assumes the original employer is doing it.

In a secondment, you should be clear about:

• Who directs the employee day-to-day;
• Who approves leave and expenses;
• How timesheets and payroll work;
• Who provides training, tools, and PPE (if needed); and
• Who is responsible for workplace health and safety obligations.

In New Zealand, health and safety duties under the Health and Safety at Work Act 2015 can apply to multiple parties, depending on the arrangement. If your employee is working at another site, you’ll want clarity in writing about how risks are managed in practice.

4) The Secondment Ends (And You Need A Plan For The Return)

A secondment should have an end point, and you should plan for it upfront. If you don’t, you risk disputes about whether the employee should stay in the secondment role permanently, whether the old role still exists, and whether there’s been an effective restructure without following process.

This is especially important if you’re using a secondment as part of a broader business change or “trial period”. Getting the paperwork right early can save you a lot of stress later.

Types Of Secondments: Internal, External, And Client Secondments

When people search “secondment” or “secondment meaning”, they’re often describing slightly different arrangements. From an employer’s perspective, it helps to identify which one you’re dealing with, because the legal and practical risks can change.

Internal Secondment (Same Employer, Different Role/Team)

This is the most common scenario for small businesses: an employee is seconded to another role within your business, perhaps in another department or location.

Typical examples include:

• Seconded to another role while you recruit a replacement;
• Seconded to a project team for a product launch;
• Seconded into a supervisor role to test leadership capability.

Even internally, you should document any material changes to duties, pay, hours, and reporting lines. If the secondment involves a significant change, a written agreement is particularly important.

External Secondment (Employee Works For Another Organisation Temporarily)

This is where your employee goes to work at another organisation for a period of time. They might physically work at the host organisation’s premises and take direction from the host’s managers.

External secondments can be useful where:

• You’re partnering with another business for a project;
• You’re loaning staff to an associated entity;
• You’re providing professional services and embedding a team member in the client’s business.

Because there are two organisations involved, you usually need both:

• A clear arrangement with your employee; and
• A separate agreement between businesses covering responsibilities, cost recovery, confidentiality, IP, liability, and health and safety.

It’s also important to consider “triangular employment” risks in New Zealand. If your employee is working under the direction or control of a host business (a “controlling third party”), there can be situations where the host may be treated as having obligations (for example, around unjustified dismissal remedies), even if they aren’t the legal employer. That’s one reason why it’s critical to document supervision, performance processes, and who has authority to make employment decisions during the secondment.

If you’re documenting the commercial side of the arrangement, you may also want to consider whether you need a broader Service Agreement with the host organisation to cover deliverables and risk allocation (this depends on whether the secondment is part of a services arrangement or simply a “loan” of staff).

Seconded To Another Role Within A Group Structure

If you operate with multiple entities (for example, separate trading companies), a secondment can sometimes look like the employee is working for one entity while being employed by another.

This can be workable, but it needs careful documentation so it’s clear:

• Which entity is the legal employer (who pays wages, who handles HR processes);
• Which entity supervises day-to-day work; and
• How costs are allocated internally.

If you have a corporate structure, it can also be worth checking your governance documents like your Company Constitution and any owner arrangements so responsibilities and authority are clear, especially where directors or senior staff are being moved around.

What Should You Include In A Secondment Agreement Or Secondment Letter?

A secondment doesn’t have to be overly formal, but it does need to be clear. For most small businesses, a well-drafted secondment letter (signed by the employer and employee) is the practical way to confirm what’s changing and what’s staying the same.

Common clauses and details to include are:

Secondment Role And Duties

• The role title and key duties during the secondment;
• Any changes in responsibilities (e.g. managing staff, handling budgets, client work);
• Whether duties may change during the secondment (and how that will be handled).

Start Date, End Date, And Extension Process

• The start date and expected end date (or end event, like “until the project concludes”);
• Whether the secondment can be extended and the process for agreeing an extension;
• Any notice requirements to end the secondment early (by either party).

Reporting Lines And Supervision

• Who the employee reports to day-to-day;
• Who manages performance and KPIs during the secondment;
• Who approves leave and expenses.

Pay, Allowances, And Other Benefits

• Whether base pay changes during the secondment;
• Any temporary allowances (e.g. acting-up allowance, travel allowance);
• Whether commissions/bonuses are affected and how they’re calculated;
• Any changes to work vehicle, phone, or other benefits.

As a general rule, if the secondment increases responsibility, it’s common to increase remuneration (even if temporarily). If the secondment reduces responsibility or pay, that can be much more legally sensitive and will usually require careful consultation and agreement.

Hours, Location, And Hybrid Work Expectations

• Whether normal hours change;
• Where the work will be performed (especially if the employee is moving sites or working at a client’s premises);
• Whether the secondment involves travel and who pays for it.

Confidentiality, IP, And Conflicts Of Interest

Secondments often involve access to different systems, commercial information, or clients. You’ll want to make sure:

• Confidentiality obligations still apply (and may need strengthening);
• Intellectual property created during the secondment is clearly owned by the right party;
• Conflicts of interest are identified and managed.

For example, if your employee is seconded to a partner business, you may want additional confidentiality protections like an NDA between the businesses and/or clear confidentiality obligations in the secondment documentation.

Policies And Systems (Including Privacy)

If the employee will use new IT systems or handle new types of personal information, make sure they understand which workplace policies apply (both yours and the host’s, if relevant).

If the secondment involves access to customer or employee data, your privacy compliance needs to remain solid under the Privacy Act 2020. It can help to ensure your Privacy Policy and internal handling practices match what’s happening in reality.

Return To Substantive Role

• What role the employee will return to at the end of the secondment (usually their original role);
• Where they will be based on return;
• How handover will work.

This “return” section is one of the most important parts of a secondment letter, because it reduces the risk of misunderstandings about what happens when the temporary arrangement finishes.

Key Legal Risks For Small Businesses When Using Secondments

Secondments are useful, but they’re not risk-free. Most of the problems we see happen when the arrangement is treated as “informal” and expectations aren’t written down.

Here are the big issues to watch for.

Accidentally Creating A Permanent Change (Or A De Facto Restructure)

If the secondment rolls on with no end date (or keeps being extended), it can start to look like the employee’s role has permanently changed. If you then try to “end” it and move them back, they may argue that the secondment role became their substantive role.

This risk increases when:

• The employee’s pay changes permanently;
• The original role is filled by someone else (or removed);
• The secondment lasts a long time without clear documentation;
• There were assurances like “this is your new role now”.

A good paper trail helps show the arrangement was temporary and agreed.

Mismanaged Performance During Secondment

Performance management can get complicated if the employee is being supervised by a different manager (or a host business). If issues arise, you still need to follow a fair process consistent with NZ employment law.

It’s a good idea to document:

• Who raises and documents performance concerns;
• Who has authority to issue warnings (if needed); and
• How you’ll handle disputes during the secondment.

Pay And Entitlements Confusion

Even for internal secondments, you can get disputes about:

• Whether an allowance applies;
• Overtime expectations;
• Whether commission structures change;
• Who approves leave and how payroll is processed.

Clear written terms reduce the chance of misunderstandings and payroll errors.

Health And Safety Responsibilities

If the employee is seconded to a different site or host organisation, you need to be confident that risks are being managed properly. In NZ, health and safety duties can attach to multiple parties depending on the facts.

From a practical perspective, the question is: who is actually controlling the work and the workplace? That often determines what needs to happen day-to-day in terms of inductions, hazard management, reporting incidents, and supervision.

Confidentiality And Data Handling

Secondments can increase the chance of information “leaking” between teams or organisations, even unintentionally.

If your seconded employee will have access to sensitive customer or business information, make sure your confidentiality obligations are clear and updated, and that access to systems is appropriate (for example, role-based access rather than “full access” by default).

How To Set Up A Secondment The Right Way (Practical Checklist)

If you’re considering secondments in your business, here’s a practical process that usually works well.

1) Decide The Business Purpose And Timeframe

• What problem are you solving (coverage, project, development, restructure trial)?
• How long do you expect the secondment to last?
• What happens at the end?

2) Check The Existing Employment Agreement

• Does the contract allow changes to duties or location?
• Is there a secondment clause already?
• Are there any consultation requirements?

If you’re unsure, it’s often worth having the contract reviewed before you propose changes, particularly where the secondment involves a significant shift in duties or pay.

3) Consult With The Employee Early

Even when you think the secondment is a great opportunity, employees may have genuine concerns (commute, workload, capability, childcare, or job security). In NZ, consultation and good faith matter, especially for changes that materially affect the employee.

4) Put The Secondment In Writing

A clear secondment letter (or variation) should set out the terms we discussed above: duties, reporting lines, pay, timeframe, and return arrangements.

If you’re seconding someone externally, also document the business-to-business terms. This is where a tailored agreement can help allocate responsibilities and reduce disputes.

5) Align Policies, Access, And H&S Before Day One

• Confirm system access levels and confidentiality expectations;
• Make sure the employee understands which policies apply;
• Ensure inductions and safety processes are done at the new site/team.

6) Review Mid-Secondment (And Document Any Changes)

If the arrangement needs to change (extension, pay adjustment, change of duties), document it. Informal “we’ll just keep going” extensions are where many disputes begin.

Key Takeaways

• A secondment is a temporary assignment where an employee is seconded to another role, team, location, or organisation for a defined period, usually while keeping their underlying employment relationship.
• In New Zealand, secondment employment arrangements aren’t governed by a single “secondment law” - they rely on your existing employment agreement, good faith processes, and clear documentation of changes (and in many cases, the employee’s agreement to a variation).
• A well-written secondment letter should cover duties, reporting lines, pay, timeframe, and (crucially) what happens when the secondment ends and the employee returns.
• Secondments can create legal risk if they become open-ended, look like a permanent variation, or are used as an informal restructure without appropriate process.
• External secondments (including client secondments) usually need both employee documentation and a separate agreement between organisations to deal with responsibilities, confidentiality, IP, health and safety, and triangular employment risks where a host may be a “controlling third party”.
• Getting the paperwork right upfront is one of the easiest ways to protect your business, avoid misunderstandings, and keep the working relationship positive.

This article is general information only and isn’t legal advice. If you’re considering a secondment (especially an external or client secondment), it’s worth getting advice on the right documents and process for your specific situation.

If you’d like help setting up a secondment arrangement (or reviewing your employment contracts and workplace documents), you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.