Subcontracting: Legal Risks in NZ

If you run a growing business, subcontracting can be one of the fastest ways to scale up without permanently increasing headcount.

Whether you’re in construction, trades, IT, marketing, logistics, events, cleaning, or professional services, subcontracting in New Zealand is common for a simple reason: you can bring in specialised skills on demand, keep overheads lean, and respond quickly to customer deadlines.

But subcontracting also comes with legal “gotchas” that can catch small businesses off guard - especially around worker classification, health and safety, payment disputes, and who owns the work product (like designs, software code, or client lists).

This guide breaks down what you need to know to subcontract confidently, stay compliant, and protect your business from day one. It’s general information only (not legal advice), and the right approach can depend on your industry, the contract structure, and how the work is managed in practice.

What Is Subcontracting (And When Does It Make Sense)?

In simple terms, subcontracting is when your business (the “head contractor” or “principal”) engages another business or individual (the “subcontractor”) to perform part of the services you’ve agreed to deliver to a client.

Subcontracting can be a smart move when:

You need extra capacity during busy seasons or for large projects.
You need specialist skills you don’t have in-house (e.g. electrical work, UX design, data migration, videography).
You want flexibility instead of committing to a permanent role.
You operate across regions and need local operators on the ground.

Typical subcontracting setups include:

A builder engaging plumbing and electrical subcontractors on a job site
An IT consultancy engaging a cybersecurity specialist for a specific engagement
A marketing agency engaging freelance copywriters and designers to deliver campaign assets
A facilities business engaging subcontractors for overflow cleaning or maintenance work

The legal key is this: even though the subcontractor is “helping you”, your business is usually still responsible for the client relationship, deadlines, quality control, and (in many cases) compliance obligations.

Contractor Or Employee? Getting The Classification Right

One of the biggest legal risks in subcontracting in New Zealand is accidentally treating someone like a contractor when, in reality, the relationship looks like employment.

This matters because employees have minimum rights and protections (like leave entitlements) that contractors generally don’t receive. If a worker is really an employee, calling them a “subcontractor” in a contract doesn’t automatically fix the issue.

A good starting point is understanding the practical differences between a contractor and a subcontractor - and how those arrangements can overlap - in Contractor vs Subcontractor.

What Do NZ Authorities Look At?

In New Zealand, employment status is generally determined by looking at the real nature of the relationship, not just the label you put on it.

Common indicators a person may be an employee (not a genuine contractor/subcontractor) include:

You control how they do the work (not just what the outcome is)
They must work set hours, or they’re integrated into your roster like staff
They can’t realistically work for other clients
You provide most tools, systems, uniforms, and training
They’re presented to customers as your staff member

On the other hand, a genuine subcontractor relationship often looks like:

They invoice you (and may be GST-registered)
They decide how to deliver the work (within agreed requirements)
They can delegate or subcontract (if permitted)
They carry their own business risk and usually provide their own tools
They may work for multiple clients

Why This Is A Big Deal For Small Businesses

If a contractor is later found to be an employee, you can face disputes and liability around things like leave, holidays, and other minimum entitlements - and it can also create flow-on issues in how you’ve structured the engagement.

This is why it’s important to use a properly drafted agreement suited to your actual working arrangement (not a generic template). If you’re weighing up what your document should look like, Contractor Agreement is a helpful reference point for the kinds of clauses that typically matter in contractor-style engagements.

And if what you really need is a long-term, directed role (with set hours and ongoing duties), it may be safer to use an employment arrangement instead - supported by an Employment Contract.

What Laws Apply To Subcontracting In New Zealand?

Subcontracting often feels “less formal” than hiring staff - but legally, there are still core rules you need to follow.

Here are some of the most common legal areas that affect subcontracting in New Zealand.

Health And Safety (Yes, Even If They’re Not Employees)

Under the Health and Safety at Work Act 2015, businesses have duties to ensure health and safety so far as reasonably practicable - and those duties can extend to contractors and subcontractors you engage (and sometimes to workers influenced or directed by your business).

This is especially important if:

You control a worksite (e.g. construction, warehousing, events)
Your subcontractor works around your team, customers, or the public
There are high-risk activities (vehicles, machinery, hazardous substances, working at heights)

In practice, that means thinking about safe systems, inductions, incident reporting, and coordination between parties. If you’re unclear on the scope of your responsibilities, the concept of Duty of Care is a useful way to frame what “reasonable steps” can look like in real business operations.

Fair Trading And Consumer Rules (If Your Subcontractor Touches Customers)

If your business supplies goods or services in New Zealand, you’ll often need to comply with consumer-facing rules such as:

Fair Trading Act 1986 (advertising and representations can’t be misleading or deceptive)
Consumer Guarantees Act 1993 (in many consumer transactions, services must be provided with reasonable care and skill and within a reasonable time)

Whether the Consumer Guarantees Act applies can depend on who your customer is (for example, consumer vs business) and whether there’s a valid contracting-out arrangement for business-to-business supplies. Even if an issue is caused by a subcontractor, your customer will usually deal with you. That means your subcontracting arrangements should help you manage quality, rework, and responsibility if something goes wrong.

Privacy Law (If They Access Customer Data)

If your subcontractor will access personal information - for example customer names, addresses, photos, CCTV, health details, or even login credentials - you need to think about Privacy Act 2020 obligations.

From a practical standpoint, your subcontracting agreement should set clear expectations around:

what data they can access and why
how they store and secure it
when they must delete or return it
what happens if there’s a suspected data breach

Tax And ACC (Commercial Reality Check)

Subcontractors typically handle their own tax obligations, but it’s still important to get clarity on the commercial basics up front, including:

whether GST applies and how it’s shown on invoices
whether expenses are included or separately reimbursed
how ACC cover will be managed (often the subcontractor arranges their own cover, depending on their structure and the work)

The main goal here is avoiding surprises - especially if you’re pricing a job tightly and your subcontractor invoices in a way you didn’t expect. For tax and ACC-specific advice, it’s worth confirming the position with an accountant, tax adviser, or ACC.

What Should Your Subcontractor Agreement Cover?

If you want to reduce disputes, protect your margins, and keep client delivery smooth, your agreement is the backbone of your subcontracting relationship.

At a minimum, a subcontractor agreement should clearly set out the “who, what, when, and how much”. But the stronger agreements go further - they anticipate what happens when things change (because projects always change).

Many small businesses run into trouble when there’s a head contract with the client, but nothing properly ties the subcontractor into that framework. This is where Subcontractor Agreement and Head Contract becomes crucial - you want the documents working together, not contradicting each other.

Scope Of Work (And What’s Out Of Scope)

Be specific about:

deliverables (what must be produced)
standards and specifications (materials, methods, quality requirements)
who supplies tools, equipment, or materials
what is explicitly excluded from the agreed scope

This one section alone prevents many “I thought you meant…” disputes.

Timing, Deadlines, And Scheduling

Your agreement should address:

start and finish dates (or milestone dates)
working hours and access requirements (if relevant)
how delays are handled (including delays caused by other trades or the client)

If you’ve promised your client a completion date, you want a mechanism to hold your subcontractor to a realistic timeframe (or at least require early warning when delivery is at risk).

Payment Terms And Invoicing

Spell out:

the rate (fixed fee, hourly/day rate, milestone payments)
when invoices can be issued
payment timeframes
what happens if the work is defective or incomplete

It can also be worth addressing whether the subcontractor is paid for rework (often, the answer should be “no” if the rework is due to their error).

Variations (Because The Job Will Change)

Variations are one of the most common causes of subcontracting disputes.

Your agreement should set a simple variation process, such as:

variation must be requested in writing
subcontractor must quote time/cost impact before starting
no variation is approved until you confirm in writing

This helps you stay in control of client expectations and avoid margin creep.

Quality, Defects, And Rectification

Make sure the agreement covers:

what “acceptable quality” means for your industry
inspection and sign-off processes
defects liability period (if relevant)
timeframes for fixing defects

This is especially important when you (not the subcontractor) are the one who has to face the client if something isn’t right.

Intellectual Property And Ownership Of Work

If your subcontractor produces anything creative or proprietary - designs, code, copy, training materials, processes, templates, photos, videos - don’t assume your business automatically owns it.

Your agreement should clearly state who owns:

new IP created during the project
pre-existing IP the subcontractor brings into the job
licences (what the client and your business can do with the deliverables)

Confidentiality And Non-Solicitation

Subcontractors often gain access to sensitive information, such as pricing, supplier lists, leads, client databases, and internal processes.

Strong confidentiality clauses help protect that information, and non-solicitation terms can reduce the risk of a subcontractor poaching your client directly (where appropriate and reasonable).

Insurance And Liability Allocation

It’s common to require subcontractors to carry appropriate insurance (depending on the work), such as:

public liability insurance
professional indemnity insurance (for advice, design, or specialist services)
contract works insurance (in construction contexts)

Your agreement can also clarify liability caps, indemnities, and who pays if there’s a third-party claim due to the subcontractor’s work.

If you want a document that’s purpose-built for this type of arrangement, a Sub-Contractor Agreement is typically designed to cover these practical risk areas in a way that matches how projects actually run.

How Do You Manage Payment, Variations, And Disputes Without Derailing The Project?

Even with a solid contract, subcontracting works best when you have simple operational processes to back it up.

Here are the most common pain points - and how to handle them in a practical, business-owner-friendly way.

Set The Payment Process Up Early (And Keep It Boring)

Payment disputes often start with small ambiguities: when invoices can be issued, what evidence is needed, who signs off, and what happens if the client hasn’t paid yet.

While every industry is different, it helps to:

agree on clear milestones tied to deliverables
require timesheets or job logs for time-based billing
set one email address/contact person for invoices
confirm what information must be included on invoices (job ID, PO number, GST details)

If getting paid on time is an ongoing challenge across your business (not just with subcontractors), tightening up your systems can make a huge difference - including your client-facing terms and invoicing process. Ensuring Your Clients Pay covers practical ways to reduce overdue invoices and improve cash flow.

Be Careful With “Pay When Paid” Assumptions

Many businesses assume they can pay subcontractors only after the client pays them. In practice, whether you can do this - and how it needs to be drafted - depends on the contract terms and, in some industries (particularly construction), specific statutory rules and standard-form contracting approaches can affect what’s enforceable.

The safest approach is to make payment expectations explicit in writing, avoid relying on assumptions, and price your client contract in a way that gives you breathing room. If you’re considering “pay when paid” clauses, it’s worth getting advice for your specific setup.

Have A Variation Workflow That Matches Real Life

In busy project environments, variations can be agreed verbally on-site or via a quick message. The problem is that weeks later, everyone remembers it differently.

A realistic workflow might be:

You request a variation by email/text, describing the change.
The subcontractor replies with the cost/time impact.
You confirm approval in writing.
The subcontractor completes the varied work and invoices accordingly.

This isn’t about slowing work down - it’s about protecting your margins and ensuring you can recover variation costs from the client where appropriate.

Plan For Disputes Before They Happen

Disputes don’t always mean someone is acting in bad faith. Sometimes it’s just a mismatch of expectations, pressure from your client, or a project that evolved mid-stream.

A well-drafted agreement typically includes a dispute resolution process, such as:

good-faith negotiation between decision-makers
mediation before court
the ability to suspend work in defined circumstances (e.g. non-payment)

From a practical point of view, you should also keep good records:

signed quotes and scopes
emails confirming variations
photos of work completed (especially on-site)
delivery logs, timesheets, and sign-off notes

A Simple “From Day One” Subcontracting Checklist

If you want a quick internal checklist for subcontracting in New Zealand, this is a solid baseline:

Confirm the relationship type (genuine subcontractor vs employee risk).
Check H&S requirements for the worksite and who is responsible for inductions, PPE, reporting, and coordination.
Use a written agreement that covers scope, quality, timing, payment, variations, IP, confidentiality, and termination.
Align your head contract and subcontract so the subcontractor’s deliverables match what you promised your client.
Set an invoicing and approval workflow so payment doesn’t become a monthly fight.
Keep documentation (especially around variations and sign-offs).

It can feel like a lot at first, but once your templates and processes are in place, subcontracting becomes far more scalable - and far less stressful.

Key Takeaways

Subcontracting in New Zealand can help you scale quickly, but you should set the legal foundations early to reduce avoidable disputes.
Getting worker classification right is critical - calling someone a subcontractor doesn’t automatically make it true if the relationship looks like employment.
Health and safety obligations can apply even when your workers are contractors or subcontractors, particularly where you influence or control the work.
A strong subcontractor agreement should clearly cover scope, timing, payment terms, variations, quality/defects, IP ownership, confidentiality, and liability/insurance.
Payment and variation disputes are common, so it’s worth having a simple written workflow and keeping good project records from day one.
If your subcontractors access customer information, you should also consider Privacy Act 2020 obligations and build data protection expectations into your contract.

If you’d like help setting up subcontracting arrangements that actually fit how your business runs, you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.

Subcontracting in New Zealand: Avoiding Misclassification and Contract Risks