Service Agreement or Terms & Conditions: What Should You Use For Your Business? (2026 Updated)

When you’re busy winning customers, delivering work, and keeping cashflow healthy, paperwork can feel like the last thing you want to deal with.

But here’s the reality: if you don’t set the rules of the relationship early, you can end up stuck in disputes about scope, payment, delays, refunds, and liability - often at the worst possible time.

This 2026 update reflects what we’re seeing across New Zealand businesses right now: more online sales, more remote service delivery, and more customers expecting clear, transparent processes. The good news is that getting your contracts right doesn’t have to be complicated - once you understand what you’re trying to achieve.

So, should you be using a Service Agreement or Terms & Conditions? Let’s break it down in a practical way.

What’s The Difference Between A Service Agreement And Terms & Conditions?

Both documents are contracts. They’re just different styles of contract, used in different situations.

Service Agreement (One-Off Or Ongoing Work)

A service agreement is usually a tailored contract between you and a specific customer (or client). It’s often signed, and it’s built around the particular job you’re doing.

A service agreement is common if you:

• provide professional services (e.g. consulting, marketing, bookkeeping, IT, design, trades, coaching)
• deliver a project with milestones, deliverables, or a defined scope
• work with business clients (B2B) who expect formal documentation
• need to manage higher risk (larger dollar values, site access, safety requirements, IP issues)

In many cases, a service agreement includes (or attaches) a statement of work that spells out exactly what you’re doing and when.

Terms & Conditions (Repeat Sales Or Standardised Services)

Terms & Conditions (T&Cs) are usually standard terms that apply each time you sell a product or service - without renegotiating the contract from scratch every time.

They’re common if you:

• sell online (including bookings, subscriptions, or digital products)
• have repeat customers and want a consistent contracting process
• offer a relatively standard service (e.g. cleaning packages, photography packages, routine maintenance)
• need something customers can accept quickly (e.g. by ticking a box)

T&Cs often live on your website and apply automatically when a customer orders, books, or pays.

So Which One Is “Better”?

Neither is automatically better - it depends on your business model and your risk profile.

In practice, plenty of businesses use both:

• Terms & Conditions for general sales and smaller engagements; and
• Service Agreements for higher-value work, custom projects, or enterprise clients.

When Should You Use A Service Agreement?

If your work is bespoke, high-value, or has lots of moving parts, a service agreement is usually the safest option.

It lets you clearly document what’s been agreed, including details that don’t fit neatly into generic terms.

1. When Scope Creep Is A Real Risk

“Can you just add one more thing?” sounds harmless - until it becomes an extra 20 hours of unpaid work.

A well-drafted service agreement (plus a clear scope or statement of work) helps you manage scope changes by setting out:

• what is included vs excluded
• how variations are requested and approved
• how pricing changes when the scope changes
• what happens if timelines shift due to the client

2. When Payment Terms Need To Be Crystal Clear

For service-based businesses, cashflow issues often come from unclear payment milestones or confusing invoicing expectations.

A service agreement can spell out:

• deposit requirements
• progress payments
• late payment interest (where appropriate)
• what happens if a client pauses the project
• your rights if invoices aren’t paid

3. When You’re Creating Or Handling Intellectual Property

If you’re creating something (like software, branding, designs, training materials, photos, or written content), ownership can become a major issue later - especially if the relationship ends on bad terms.

A service agreement is a good place to deal with:

• who owns the work product (and when ownership transfers)
• any licence you keep to reuse templates or know-how
• what the client is allowed to do with drafts and unused concepts
• moral rights consents (where relevant)

If you’re working with subcontractors or collaborators, it’s also important that your back-to-back contracts line up so you can actually pass rights to your client.

4. When You Need Stronger Risk Controls

Some jobs simply carry more risk - for example, you’re providing advice, accessing customer premises, working with sensitive data, or delivering time-critical services.

A tailored service agreement lets you address the risks specific to the engagement, including limitations of liability and clear boundaries around what you’re responsible for (and what you’re not).

If you’re relying on broad exclusions or limitations, it’s important to ensure they’re drafted in a way that’s actually workable under New Zealand law and consistent with your consumer law obligations.

When Should You Use Terms & Conditions?

If your business sells repeatedly, at scale, or online, T&Cs can be a practical way to stay protected from day one - without slowing down your sales process.

1. When You Want Fast, Repeatable Sales

If you’re taking bookings every day, selling through a website, or offering standard packages, you don’t want to negotiate a new contract each time.

Good T&Cs can give you a consistent set of rules around:

• ordering and payment
• delivery timeframes
• customer cancellations and rescheduling
• chargebacks and disputed transactions
• how complaints are handled

They also reduce the chances of “but nobody told me that” - because the terms are published and accepted at the point of sale.

2. When You Sell Products Or Mixed Product/Service Packages

T&Cs are particularly helpful if you sell goods (including online) and need clear policies around shipping, returns, and faults.

In New Zealand, you’ll usually need to consider your obligations under the Consumer Guarantees Act 1993 (for consumer transactions) and the Fair Trading Act 1986 (for advertising and representations).

That means you can’t simply write “no refunds” and assume you’re covered. Your documents need to match what the law requires, and what you’re promising to customers in marketing.

3. When You Need Website-Friendly Acceptance

Online contracting usually relies on clear acceptance mechanics. For example, customers may:

• tick a checkbox to accept your T&Cs
• click “I agree”
• complete checkout with a clear link to the terms

This is one reason T&Cs are popular for eCommerce and platform-style businesses: they’re designed to be accepted quickly, without printing and signing.

4. When You Want One Set Of Rules For Everyone

If you have many customers, T&Cs help you avoid inconsistent promises made by different team members.

That said, you still need to make sure your staff understand the terms and don’t accidentally undermine them (for example, promising a different cancellation policy in a DM or email).

What Should A Good Service Agreement Or Set Of Terms Include?

There’s no “one size fits all” template that will properly protect every business.

But there are some common clauses that most New Zealand businesses should consider, whether you’re using a service agreement, T&Cs, or a hybrid approach.

Scope, Deliverables, And Change Control

• Scope of services: what you’ll do (and what you won’t do).
• Client responsibilities: what you need from them to deliver on time.
• Variations: how changes are quoted, approved, and billed.

Fees, Invoicing, And Payment Timing

• price and how it’s calculated
• deposit and milestone payment schedule
• expenses and disbursements (and whether they’re pre-approved)
• late payment consequences

Term, Renewal, And Ending The Relationship

Even great business relationships sometimes end - and the contract should handle that cleanly.

• Term: is it a one-off project, or ongoing?
• Termination: when can either party end it, and what notice is required?
• Exit obligations: what happens to work in progress, access, and files?

If you want an agreement that is clear and enforceable, it helps to understand what makes a contract legally binding in the first place - especially around offer, acceptance, and certainty of terms.

Liability, Warranties, And Dispute Management

This is where a lot of DIY templates fall down. Businesses often add aggressive liability clauses without considering whether they’re appropriate (or effective) for their circumstances.

You might need to consider:

• limitations of liability (and what types of loss are excluded)
• service standards and warranties (what you promise, and what you don’t)
• timeframes for raising issues
• a practical dispute resolution process before anyone rushes to legal action

Privacy And Data Handling (Especially If You Collect Customer Information)

If you collect personal information - even something as basic as names, phone numbers, addresses, booking details, or email lists - you need to think about the Privacy Act 2020 and how you’ll explain your data practices.

This is where having a properly drafted Privacy Policy becomes important, especially if you’re collecting information through a website or online forms.

Your contract and privacy documents should work together. For example, your T&Cs might refer to how you handle data, but your privacy policy will usually contain the detail.

Employment And Contractor Boundaries (If You’re Delivering Work Through People)

If you’re scaling up, the next step is often hiring staff or using contractors - and that has a direct impact on how you deliver your services.

For employees, a clear Employment Contract helps you set expectations around duties, hours, confidentiality, and IP created during employment.

For contractors, you’ll want to make sure you’re using the right agreement and that the relationship reflects what’s happening in practice - misclassification can create real risk.

Can You Use Both (And If So, How)?

Yes - and for many businesses, this is the most practical way to stay protected as you grow.

Here are a few common setups we see in New Zealand:

Option 1: Website Terms & Conditions + Project Service Agreement

You might use website or booking T&Cs for everyday customers, and then use a tailored service agreement when:

• a client wants customised work
• the project value is higher
• the delivery is complex (multiple phases, multiple stakeholders)
• you’re working with a corporate procurement team

Option 2: Master Service Agreement + Statements Of Work

This is common for B2B service providers (like IT, marketing, and professional services).

The master agreement sets the general legal framework, and each statement of work covers the commercial details (scope, timeline, fees). It can be a great way to avoid renegotiating the legal terms every time.

In this structure, it’s also worth thinking about how your contract links to other legal documents you might have in place, like a Service Level Agreement (if you’re promising response times or uptime) or a confidentiality document for early discussions.

Option 3: Terms & Conditions + Quote + Invoice (For Simple Services)

For simpler services, you may rely on:

• a written quote describing the work
• T&Cs that sit behind the quote (and are referenced clearly)
• an invoice that reflects the agreed price and payment terms

If you use quotes, it’s worth being clear on whether the quote is intended to be binding and what assumptions it’s based on, because a quotation can be legally binding in some circumstances.

What Are The Biggest Mistakes Businesses Make With These Documents?

Most contract problems don’t come from bad intentions - they come from unclear expectations.

Here are some of the biggest traps we see when businesses try to piece together agreements as they go.

1. Using A Template That Doesn’t Match Your Business

Generic templates often miss the clauses you actually need (like scope change processes), while including clauses you don’t understand (or that don’t fit how you operate).

That can leave you exposed right when you need the document to protect you - for example, when a customer refuses to pay or claims you promised something you didn’t.

2. Not Aligning Your Contract With Consumer Law

If you sell to consumers, your contract needs to reflect your obligations under the Consumer Guarantees Act 1993 and Fair Trading Act 1986.

Overreaching terms (like “no refunds under any circumstances”) can create confusion, complaints, and reputational damage - and they may not be enforceable.

3. Poor Acceptance And Record Keeping

Even the best terms won’t help much if you can’t show the customer agreed to them.

Make sure you have a reliable process, such as:

• signed acceptance (for service agreements)
• tick-box acceptance with time/date records (for online T&Cs)
• email trails that clearly attach or link to the terms

4. Forgetting The “Behind The Scenes” Contracts

Your customer-facing contract is only part of the picture.

If you use subcontractors, suppliers, or partners, you also need contracts that protect you upstream - otherwise you might promise something to a client that your subcontractor agreement doesn’t support.

And if you’re operating through a company with multiple owners, it’s worth having the internal rules documented too, like a Shareholders Agreement and a Company Constitution, so decision-making and exits don’t become messy later.

5. Not Updating Your Documents As You Grow

Your first version of T&Cs might work when you’re small, but as you add new services, bring on staff, increase pricing, or sell in new ways, your contract should keep up.

It’s a good habit to review your contracts whenever you:

• launch a new product/service line
• change payment models (subscriptions, bundles, milestone billing)
• start working with larger clients
• begin collecting more customer data

Key Takeaways

• A Service Agreement is usually best for bespoke, higher-value, higher-risk work where you need tailored scope, milestones, and project-specific protections.
• Terms & Conditions are often best for repeat sales, online bookings, and standardised services where you want a consistent, scalable contracting process.
• Many businesses use both: T&Cs for everyday sales and a service agreement for larger or more complex client engagements.
• Your documents should reflect New Zealand legal requirements, including the Fair Trading Act 1986, Consumer Guarantees Act 1993, and the Privacy Act 2020 where relevant.
• Good contracts don’t just reduce risk - they also improve customer relationships by setting clear expectations around scope, payment, timing, and problem-solving.
• Avoid relying on generic templates; contracts work best when they’re drafted to match how your business actually operates and how your customers buy from you.

If you’d like help choosing between Terms & Conditions and a Service Agreement (or setting up both so they work together), you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.