Law Of Agency In New Zealand: Key Rules For Businesses

If your business uses someone else to negotiate, sign, buy, sell, or deal with customers on your behalf, you’re already dealing with agency law - even if you’ve never used that term.

This comes up all the time for small businesses: a sales rep agrees to pricing with a customer, a manager orders stock, a contractor speaks to clients “for you”, or a bookkeeper deals with a supplier dispute. These everyday decisions can create real legal obligations for your business.

Getting the basics right early means you’ll be far more confident about what your staff, contractors, and intermediaries can (and can’t) do in your name - and you’ll avoid nasty surprises when a deal goes sideways.

Note: This article is general information for New Zealand businesses and isn’t legal advice. Agency issues are fact-specific, so it’s worth getting advice about your particular arrangements.

What Is The Law Of Agency (And Why Should Your Business Care)?

In simple terms, the law of agency is the set of rules that determines when one person (an agent) can create legal obligations for another (the principal).

When an agency relationship exists (and the agent is acting within their authority), the agent’s acts can bind the principal. That means your business might be legally responsible for:

• contracts someone “acting for you” signs with customers or suppliers
• representations made during negotiations (for example, about product features, delivery timeframes, or pricing)
• commitments that affect your business finances or risk exposure

This is why agency law matters even if you’re not running a large company. Many small business owners assume, “If I didn’t sign it, it’s not my problem.” Unfortunately, agency law can still make it your problem - depending on the authority you gave to the person acting for you, or the authority you led others to reasonably believe they had.

In New Zealand, agency principles largely come from common law (judge-made law), and are heavily shaped by how real-world business dealings work. The key question is usually: did the agent have authority to act, and did the other party reasonably rely on authority that could be attributed to the principal?

If you’re building relationships with intermediaries (sales agents, distributors, contractors, managers, consultants), it’s worth understanding Agency Relationships at a practical level, because that knowledge feeds directly into how you set up roles, delegations, and contracts.

When Does An Agency Relationship Arise In Business?

An agency relationship can be created in a few different ways, and this is where many business owners get caught out: it doesn’t always require a formal written agreement.

1. Express Agency (Clearly Agreed)

This is the most straightforward situation. You appoint someone as your agent, and it’s clear they can act for you (often in writing).

Examples include:

• appointing a real estate agent to sell your commercial property
• authorising an employee to enter into supply arrangements up to a certain dollar value
• appointing a consultant to negotiate deals on your behalf

Even where you’ve “clearly agreed”, the devil is in the details: what exactly can they do, what can’t they do, and what happens if they exceed their authority?

2. Implied Agency (Based On Role Or Conduct)

Agency can also be implied from the circumstances. If you put someone in a position where it’s normal for that person to have certain powers, the law may treat them as having that authority.

For example, if someone is your “operations manager” and deals with suppliers every day, a supplier may reasonably assume that person can:

• order stock
• agree to standard terms
• approve routine changes to delivery schedules

This can be true even if, internally, you told that person “you can’t spend over $5,000 without asking me first.” If the supplier doesn’t know about that internal limitation, your business may still end up bound.

3. Agency By “Holding Out” (Apparent Authority)

One of the biggest risk areas for small businesses is apparent authority (sometimes called “ostensible authority”). This happens when the principal represents - through words or conduct - that someone has authority to act for them, and a third party reasonably relies on that representation.

Common “holding out” situations include:

• giving someone a company email address and job title that suggests decision-making power
• letting a person lead negotiations while you stay silent
• allowing a contractor to present themselves as your “sales manager” to clients
• letting someone repeatedly enter into similar contracts without correcting the other party

From a practical standpoint, apparent authority is about how it looks from the outside - but it generally needs to be a belief created by the business (not just the agent’s own claims). If you create the impression someone can bind your business, you may be stuck with the consequences.

4. Agency By Necessity (Less Common, But Still Relevant)

Agency by necessity is rare and narrowly applied in modern business. It may arise in urgent situations where:

• it’s necessary to act to prevent serious loss
• it’s impractical to get instructions from the principal
• the agent acts reasonably in the circumstances (and within what’s genuinely necessary)

This is not something you “plan” for - but it’s useful to know it exists when thinking about emergency authority in logistics, perishable goods, or urgent property situations.

Types Of Authority Under Agency Law (The Part That Determines Liability)

When agency issues end up in a dispute, the core legal question is often whether the agent had authority, and what kind of authority it was.

Actual Authority (What You Really Allowed)

Actual authority is the authority you actually give to the agent.

Actual authority can be:

• express (spelled out clearly, like “you may sign purchase orders up to $10,000”), or
• implied (not written, but necessary to do the job you hired them to do).

Tip: actual authority is easier to manage if you document it somewhere sensible (for example, in an employment contract, contractor agreement, or an internal delegation policy).

Apparent Authority (What Others Reasonably Thought You Allowed)

Apparent authority is about appearances and third-party reliance. Even if you did not give actual authority, your business can still be bound if your conduct (or other representations attributable to you) led the other party to reasonably believe the agent had authority.

This is why it’s important to think beyond your internal intentions. Ask yourself: if I were the customer/supplier, what would I reasonably assume this person is allowed to do based on what the business has said or done?

Ratification (Approving It After The Fact)

If someone acts without authority, you might still choose to “adopt” the act afterwards - this is called ratification.

Ratification can be helpful if the person did something unauthorised but commercially beneficial, and you want to keep the deal.

But it cuts both ways: if you accept the benefits of an unauthorised deal (for example, you take delivery, invoice the customer, or start performing), you may be treated as having ratified it - especially if you knew (or should reasonably have known) the key facts and acted in a way that clearly affirms the transaction. Once ratified, it’s generally treated as binding as if authority existed from the start.

Common Agency Situations For Small Businesses (And How To Avoid Getting Burned)

Agency law isn’t just a “big corporate” issue. Here are the situations we regularly see for small and growing businesses in New Zealand.

Employees Negotiating Or Signing Deals

Employees often have implied authority because of their role. The more senior they are, the more likely it is that customers and suppliers will assume they can commit the business.

If you want to control this risk, your Employment Contract (and your internal policies) should clearly deal with things like:

• who can sign contracts, and up to what value
• approval processes for discounting, refunds, or credits
• limits on representing your business (for example, “must not make guarantees about performance or delivery without approval”)

This is also a good moment to check your wider consumer-facing statements. If your agent makes misleading claims, your business may still carry the legal risk under laws like the Fair Trading Act 1986.

Contractors And Consultants Dealing With Your Customers

Many small businesses use contractors for sales, marketing, operations, or customer delivery. A contractor isn’t an employee - but they can still create agency risk if they deal with third parties as the “face” of your business.

To reduce uncertainty, a tailored Contractor Agreement can help set boundaries around:

• whether the contractor is authorised to negotiate or sign anything
• what they can say to customers (and what they must not say)
• who owns leads and customer relationships
• indemnities and responsibility if they exceed authority

It’s also worth making sure your contractor’s email signature, LinkedIn description, and customer-facing materials don’t accidentally “hold them out” as having authority you never intended to give.

Sales Agents, Brokers, And Intermediaries

If you use an intermediary to bring in deals (for example, a sales agent paid on commission), the agency relationship can become central to your revenue - and your legal risk.

These relationships often need more than a quick email exchange. A proper Service Agreement can document:

• what the agent is authorised to do (and what needs your written approval)
• territory, customer segments, and exclusivity (if any)
• commission structure and when commission is earned
• how disputes are handled, and termination rules

Without clear terms, you can end up in messy disputes like: “They promised the customer a 12-month deal” vs “We only do month-to-month” - and your business is left trying to unwind expectations.

Someone Signing Documents “On Behalf Of” The Business

When signatures are involved, agency law becomes very real, very fast. If someone signs on behalf of your business and they have authority (actual or apparent), you may be bound.

Many businesses use formal delegations to remove doubt - for example, an Authority To Act Form can be a practical way to record who can do what (especially where banks, suppliers, or government agencies require proof of authority).

It can also help you avoid internal confusion as your business grows. Once you have a few managers, a bookkeeper, and a sales function, “everyone thought someone else had approved it” becomes a common (and expensive) story.

How Do You Set Up Agency Arrangements Properly (Without Slowing Your Business Down)?

Agency law shouldn’t stop you from delegating - delegation is how businesses grow. The goal is to delegate clearly, so your team can move fast without exposing you to uncontrolled risk.

1. Be Clear On Who The Principal Is

First, make sure it’s obvious who is actually contracting:

• Is it you personally as a sole trader?
• Is it your company?
• Is it a related entity (like a holding company or trading entity)?

This matters because agency binds the principal. If documents, invoices, and communications don’t clearly identify the principal, you can accidentally create personal liability, or confuse which entity is responsible.

2. Put Authority Limits In Writing (And Match Them With Reality)

Written authority limits are powerful - but only if your external conduct matches them.

For example, if only directors can approve contracts, but you let a staff member negotiate and “confirm” deals for months, a third party may reasonably believe that staff member has authority (apparent authority), regardless of what your internal policy says.

A practical approach is to:

• set sensible spending/contract limits by role
• use standard contract templates with pre-approved terms
• require “director sign-off” for non-standard terms (like special warranties or unusual payment terms)

3. Use Consistent Signing Practices

If your business is a company, make sure your signing blocks and processes are consistent across documents.

It can also help to train staff on what to say when negotiating, such as: “Subject to contract and final approval.” (This won’t solve everything, but it can reduce the risk of someone treating negotiations as a final commitment.)

4. Manage What Your Agents Say (Not Just What They Sign)

Small businesses often focus on contracts - but agency issues also arise through statements and promises made during sales and service delivery.

If your agent says “We guarantee this will achieve X result,” that can trigger legal risk under:

• Fair Trading Act 1986 (misleading or deceptive conduct)
• Consumer Guarantees Act 1993 (where you’re supplying to consumers and certain guarantees apply)

Simple scripts, training, and written guidelines can go a long way here - especially for customer-facing roles.

5. Plan For What Happens When The Relationship Ends

Agency relationships can create ongoing risk even after termination - for example, if a former agent continues to represent themselves as connected to your business.

Your agreements should cover practical exit steps like:

• returning business property and customer data
• removing access to systems and email
• stopping use of branding and marketing materials
• clear notices to clients (where appropriate) about who is authorised going forward

This isn’t about being heavy-handed - it’s about preventing confusion that could lead to accidental liability.

Key Takeaways

• The law of agency affects your business whenever someone acts on your behalf - employees, contractors, managers, and intermediaries can all create agency risk.
• An agency relationship can be express, implied, or based on apparent authority, meaning you can be bound even without a signed “agency agreement”.
• Actual authority depends on what you really permitted; apparent authority depends on what you led others to reasonably believe (through representations attributable to your business).
• If you accept the benefits of an unauthorised deal, you may ratify it - and your business can become bound after the fact.
• Clear contracts, consistent delegation practices, and well-managed customer communications help you stay protected from day one as you delegate and grow.
• If your business relies on people negotiating or signing with third parties, it’s worth getting tailored legal advice so your authority limits are enforceable in the real world (not just on paper).

If you’d like help setting up or reviewing your agency arrangements, contracts, or internal delegations, you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.