Employment Offer Letters vs Employment Agreements In New Zealand

If you’re hiring (or about to hire) your first employee, it’s completely normal to feel a bit stuck on the paperwork. A lot of NZ business owners ask the same question:

What’s the difference between an employment offer letter and an employment agreement - and which one do I actually need?

The short version is that an offer letter can be a useful step in your hiring process, but it usually isn’t enough on its own. In New Zealand, you have legal obligations around putting key terms in writing, giving certain information to employees, and making sure the relationship is clear and compliant from day one.

Below, we’ll break down employment offer letters vs employment agreements in plain English, explain where each document fits, and share practical tips to help you avoid common (and expensive) mistakes.

What Is The Difference Between An Employment Offer Letter And An Employment Agreement?

An easy way to think about it is:

• An employment offer letter is usually a pre-contract document used to make a formal offer and confirm the headline terms.
• An employment agreement is the actual contract that governs the employment relationship once the employee starts (and it needs to include certain required terms and information under NZ employment law).

Employment Offer Letter: What It Usually Does

An offer letter is typically used to:

• confirm you’re offering someone the role
• set out key basics (role title, start date, pay, location)
• make the offer conditional (for example, subject to reference checks or proof of right to work)
• set a deadline for acceptance

Offer letters are especially common when you’re moving quickly, hiring remotely, or you want to confirm the big picture before you finalise the full contract.

But here’s the key point: an offer letter can still be legally binding depending on what it says and how it’s presented. If you accidentally include full “contract-style” language (or you don’t clearly state that the offer is subject to a signed employment agreement), you may create obligations you didn’t intend to lock in yet.

Employment Agreement: What It Does

An employment agreement (sometimes called an employment contract) is the document that sets out the full terms of employment. It should clearly cover things like:

• duties and expectations
• hours of work and work patterns
• pay structure, deductions, and reimbursement rules
• leave entitlements and holiday rules
• confidentiality and IP protection
• performance and disciplinary processes
• termination notice and procedures

For most small businesses, this is the document that gives you the day-to-day protection you actually need. If you want something robust and tailored, it’s worth getting an Employment Contract prepared properly rather than relying on a generic template.

Do You Need An Offer Letter, An Employment Agreement, Or Both?

For NZ employers, the safest approach is usually:

• Use an offer letter to formally offer the role (often with conditions), and
• Use an employment agreement as the binding contract that applies once the person starts (and ideally, it’s signed before day one).

That said, you don’t always need both documents. What matters is that you:

• meet your legal obligations (including having the right terms and required information in writing), and
• avoid misunderstandings that can lead to disputes later.

When An Offer Letter Helps

An offer letter can be helpful if:

• you’re offering a role subject to conditions (police check, reference checks, proof of qualifications, medical clearance, trial period requirements, etc.)
• you want to confirm the high-level terms quickly while you finalise the longer agreement
• you’re making a senior hire and you want acceptance in principle before spending time negotiating detailed clauses

When You Can Skip The Offer Letter

If your employment agreement is ready to go and you can send it immediately, you may choose to make the offer by sending the employment agreement itself (with a short email confirming it’s the offer and asking them to review and sign).

Just be careful: the employee must be given a real opportunity to seek independent advice and consider the agreement before signing. Rushing this step can create risk.

A Note On “Casual” And Contractor Hires

Before you decide what paperwork you need, make sure you’re classifying the relationship correctly. If you’re hiring an employee, you’ll generally need a written employment agreement.

If you’re engaging a contractor, the right approach is usually a contractor agreement (and the legal test for contractor vs employee can be more complex than many business owners expect). If you’re engaging contractors regularly, a tailored Contractors Agreement can help set clear deliverables, payment terms, and IP ownership from the start.

What Must Be Included In An Employment Agreement In New Zealand?

In New Zealand, employment relationships are governed by a mix of legislation and good faith obligations. The big one is the Employment Relations Act 2000, which requires employers to have a written employment agreement in place and to include certain key terms and information.

Exactly what must be included can depend on the role and whether a collective agreement applies, but there are some common essentials that small businesses should treat as non-negotiable.

Key Terms You Should Cover (At A Minimum)

To protect your business and set clear expectations, your employment agreement should clearly cover:

• Parties and role details: who the employer is (legal entity name), job title, and a description of duties
• Start date and location: including whether the role can be moved between sites or done remotely
• Hours and days of work: plus any flexibility requirements (and what happens if hours change)
• Pay: wage/salary, pay frequency, and how pay is calculated (especially if there are commissions or allowances)
• Leave entitlements: annual leave, sick leave, bereavement leave, public holidays (Holidays Act 2003 compliance is a must)
• Trial period (if applicable): strict rules apply and it must be agreed before the employee starts (and 90-day trials are only available for eligible employers and employees), so you need to set it up correctly
• Confidentiality and IP: especially if the employee will handle client lists, pricing, processes, marketing plans, or create content
• Health and safety: setting expectations around compliance with workplace policies (Health and Safety at Work Act 2015)
• Termination: notice periods, final pay, return of property, and garden leave clauses where appropriate

Don’t Forget The “Supporting Documents”

Many small businesses focus on the contract but forget the policies that make it workable in real life. Your agreement can (and often should) refer to key policies, like:

• a code of conduct
• leave request processes
• internet/social media rules
• privacy and surveillance expectations
• health and safety procedures

Having a well-drafted Workplace Policy set can make onboarding smoother and help you enforce standards consistently.

And if your team members might be working for (or setting up) side businesses, a Conflict Of Interest Policy is often a practical way to set clear boundaries early.

What Should You Put In An Employment Offer Letter (And What Should You Avoid)?

A good offer letter is short, clear, and careful about what it locks in.

What To Include In An Offer Letter

Most offer letters include:

• Position and reporting line: job title and who they report to
• Proposed start date: and any onboarding requirements
• Pay offer: wage/salary and pay frequency (you can note this is subject to the employment agreement)
• Key conditions: for example, satisfactory references, proof of qualifications, right to work in NZ
• Subject to contract wording: making it clear the offer is conditional on signing a formal employment agreement
• Acceptance process: how to accept and by what deadline

What To Avoid In An Offer Letter

This is where many businesses trip up. You’ll want to avoid:

• including detailed contractual clauses (like full termination processes, restraint clauses, or disciplinary procedures) if you intend those to sit in the employment agreement
• accidentally guaranteeing things (for example, “you will receive a bonus of $X” rather than “you may be eligible for a bonus under our bonus policy”)
• unclear conditions (vague statements like “subject to checks” without saying what checks and what happens if they’re not met)
• misleading statements about role security or future pay increases (this can create dispute risk later)

It’s also worth remembering that hiring communications (including offer letters) can have legal consequences under general contract principles and employment law, and in some contexts may also raise issues under the Fair Trading Act if representations are made in trade.

Common Mistakes Employers Make (And How To Avoid Them)

Getting the paperwork wrong doesn’t just create admin headaches - it can increase the risk of personal grievances, wage and leave disputes, and expensive “he said / she said” situations.

Here are some of the most common pitfalls we see for small businesses.

1. Treating The Offer Letter As “The Contract”

If your offer letter is the only document you have (or it includes all the terms), you may unintentionally create a binding agreement that’s missing key protections.

Fix: Keep the offer letter high-level and make it clearly subject to signing the employment agreement.

2. Using A One-Size-Fits-All Template

Templates often miss role-specific risks. For example, a sales employee, café manager, and office administrator all raise different issues around rosters, overtime, confidentiality, and performance management.

Fix: Use a tailored agreement for the type of role you’re hiring into. If you’re unsure, an employment lawyer can help you set up something that matches how your business actually operates.

3. Not Properly Addressing Pay And Hours

Disputes often start with unclear expectations around:

• guaranteed hours vs variable hours
• when overtime applies (and whether it’s paid)
• breaks and rostering
• commission structures and when commission is “earned”

Fix: Spell out how pay is calculated and how hours are set. If your rostering changes week to week, your agreement should reflect that reality.

4. Missing Policy Coverage (Privacy, Devices, Monitoring)

If your employee uses your systems, has access to customer data, or you use cameras or monitoring tools, you’ll want clear rules and privacy-safe processes. The Privacy Act 2020 matters here, especially if you collect, store, or share personal information (even basic info like customer contact details).

Fix: Align your employment docs and internal processes with your Privacy Policy and internal privacy procedures (and make sure staff understand what’s expected).

5. Trying To “Solve” Performance Issues With A Better Contract

A strong agreement helps, but it doesn’t replace a fair process. In NZ, how you manage performance and conduct matters just as much as what the contract says.

Fix: Have a workable process for feedback, documentation, and improvement plans - and use it consistently. Your agreement and policies should support good management, not replace it.

Best Practice: A Simple Hiring Paperwork Process For Small Businesses

If you want a practical way to approach it, here’s a common workflow that keeps things clean and reduces risk.

Step 1: Make The Offer (Carefully)

• send a short offer letter (or an email offer) confirming the key terms
• include conditions (if needed)
• make it subject to a signed employment agreement

Step 2: Send The Employment Agreement Early

• provide the full agreement
• encourage the candidate to get independent advice
• give them reasonable time to review (avoid last-minute pressure)

Step 3: Confirm Onboarding Details In Writing

• where to show up (or how to log in)
• who their contact person is
• what to bring (bank details, KiwiSaver forms, ID)

Step 4: Put Your Policies In Place

Even a small team benefits from clear written expectations. This is usually where you include things like:

• code of conduct
• health and safety
• privacy and IT use
• conflicts of interest
• leave and rostering

This doesn’t have to be overwhelming - the goal is to be protected from day one and to reduce confusion as your business grows.

Key Takeaways

• Employment offer letters vs employment agreements: an offer letter is typically a preliminary document confirming the offer, while the employment agreement is the binding contract that should contain the full legal terms of employment.
• An offer letter can still be legally binding depending on its wording, so it should be drafted carefully and usually made subject to a signed employment agreement.
• In New Zealand, written employment agreements are a core compliance requirement under the Employment Relations Act 2000, and they should align with other obligations (like leave under the Holidays Act 2003 and privacy under the Privacy Act 2020).
• The best protection for your business comes from having a tailored employment agreement plus clear, practical workplace policies that reflect how you actually run your business.
• Common hiring document mistakes (like relying on templates, unclear hours/pay terms, or missing policy coverage) can create dispute risk later - it’s worth getting the foundations right upfront.

If you’d like help putting the right hiring documents in place (or you want someone to review what you’re currently using), you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.