Can You Charge Late Fees On Invoices In New Zealand?

You’ve done the work, delivered the product, and sent the invoice.

Then you wait. And follow up. And wait some more.

If you run a small business, late payments can quickly turn into a cashflow headache - and they can make it harder to pay your team, your suppliers, or even yourself. So it’s completely normal to wonder whether you can charge late fees on invoices in New Zealand (and if you can, how to do it without creating legal risk or awkward customer disputes).

This article provides general information only and doesn’t constitute legal advice. Because the rules can vary depending on your industry, customer type (consumer vs business), and how your terms are set up, it’s worth getting advice for your specific situation.

In this guide, we’ll walk through how late fees typically work in NZ, what you should put in your payment terms, and the practical steps you can take to help get paid on time (without burning customer relationships).

Are Late Fees On Invoices Legal In New Zealand?

In many cases, yes - you can charge late fees on invoices in New Zealand. But there’s an important catch: you generally need to have clearly agreed terms in place before the customer becomes late.

Late fees usually fall into one of these categories:

• Default interest (for example, interest charged per month on overdue amounts)
• Fixed late payment fees (for example, a $25 administration fee if payment is overdue)
• Cost recovery (for example, debt collection costs, enforcement costs, or legal costs if your contract allows it)

The key legal idea is this: late fees aren’t something you can just “decide” to impose after the fact. For late fees to be enforceable, they should be part of the customer’s contract with you - typically in your terms and conditions, credit application, service agreement, or signed quote acceptance.

If you’re dealing with everyday B2C customers (not just businesses), you should be especially careful that late fees are fair and clearly disclosed. If a fee looks excessive or surprising, it can increase dispute risk and may raise issues under consumer protection laws.

In practice, the safest approach is to set out late fee terms in writing from day one, and make sure the customer has a real opportunity to read and accept them.

When Can You Actually Enforce Late Fees?

Even if late fees are “allowed”, being able to enforce them depends on how your agreement is set up and what exactly you’re charging.

1) Your Terms Must Be Incorporated Into The Deal

It’s not enough for late fees to be buried somewhere on your website if the customer never agreed to them.

To enforce late fees, you typically want evidence that the customer:

• received the terms (before the sale or service was confirmed); and
• accepted the terms (for example, signed acceptance, checked a box online, or proceeded on terms clearly displayed on a quote/invoice that forms part of the contract).

This is why well-drafted Business Terms can make a big difference. They help you create a consistent process so your payment terms aren’t a “maybe” - they’re part of your contract.

2) The Late Fee Must Be Reasonable (And Not A Punishment)

Late fees should reflect a genuine commercial purpose - like compensating you for the cost of delayed cashflow and admin - rather than punishing the customer.

If a late fee is disproportionate to the loss caused by late payment, there’s a higher risk it could be challenged as an unenforceable penalty (especially if it’s a fixed amount that doesn’t match the real cost of lateness).

As a small business owner, the practical takeaway is: keep late fees sensible, explain them clearly, and avoid “shock” charges.

3) You Need Clear Triggers And Calculations

Ambiguity is where disputes thrive. Your late fee clause should spell out:

• when an invoice is considered overdue (e.g. “7 days from invoice date” or “on the due date shown”)
• when the late fee starts (e.g. “from the day after the due date”)
• how it’s calculated (e.g. “2% per month, calculated daily” or “$20 admin fee per overdue invoice”)
• whether it applies per invoice or per account

If you want your payment terms to be enforceable, your clause should be written in plain language and structured to match how you actually invoice customers.

What Laws Matter When Charging Late Fees?

Late fees are mostly a contract issue - but there are a few key NZ laws that often come into the picture depending on who your customers are and how you structure payment and pricing.

Fair Trading Act 1986 (Especially For Consumer-Facing Businesses)

If you’re selling to consumers, the Fair Trading Act 1986 can be relevant because it prohibits misleading or deceptive conduct.

That means you should be careful that:

• your pricing and payment terms aren’t misleading;
• late fees are clearly disclosed upfront (not hidden or “revealed” later); and
• any statements you make about “no fees” or “easy payments” don’t conflict with your actual terms.

Unfair Contract Terms (Including Some Small Business Contracts)

If you use standard form contracts (the same T&Cs for lots of customers), NZ unfair contract terms rules may apply. These protections apply to consumer contracts and, in many cases, also to small trade contracts.

These rules are aimed at preventing one-sided contract terms that create a significant imbalance and aren’t reasonably necessary to protect legitimate interests.

Late fee clauses can become a problem if they’re overly harsh, unexpected, or not commercially justified - particularly where the customer is a consumer or a small business signing your standard terms.

Credit Contracts and Consumer Finance Act 2003 (CCCFA) (When Late Fees/Interest Look Like “Credit”)

In some situations, late fees and default interest can intersect with the Credit Contracts and Consumer Finance Act 2003 (CCCFA) - especially where you’re dealing with a consumer and the arrangement effectively involves providing credit (for example, allowing payment over time, or charging interest/default fees in a way that goes beyond a simple “pay by X date” invoice).

Whether the CCCFA applies depends on the structure and substance of what you’re offering. If it does apply, there can be additional requirements (such as disclosure obligations and rules around fees needing to be reasonable), and non-compliance can create serious risk. If you’re unsure, it’s worth getting advice before rolling out a “standard” late fee or interest model for consumers.

Contract Law Basics (Offer, Acceptance, Certainty)

Most late fee disputes don’t end up being about “late fees” as a standalone concept. They become disputes about whether there was a contract, what the contract included, and whether the customer agreed to those specific terms.

That’s why it’s worth making your process consistent and legally clean - for example, making sure your quote acceptance and terms are aligned, and your invoicing matches the agreement the customer accepted.

If your documents are inconsistent, your customer may argue that the late fee clause was never agreed (or was superseded by another document).

How Should You Write Late Fee Terms In Your Invoices And Contracts?

If you want to charge late fees on invoices in New Zealand, the best practice is to include late fee clauses in your core customer contract documents - and then repeat (or summarise) them on the invoice as a reminder.

Here are the practical components we usually recommend small businesses think about.

Set Payment Timeframes That Match Your Business Reality

If your invoices say “7 days” but you’re fine waiting 30 days in practice, it’s harder to enforce late fees consistently without damaging relationships. Set a timeframe you’re comfortable enforcing.

Common payment terms include:

• payment on receipt;
• 7 days from invoice date;
• 14 days from invoice date;
• end of month following invoice (more common for ongoing supply relationships);
• progress payments tied to milestones (common for project work).

If you’re doing larger projects, it can help to document milestone payments and what happens if payments are late. That’s often done through a tailored Service Agreement (or a master agreement plus statements of work).

Pick A Late Fee Structure You Can Defend

There’s no one perfect number for late fees - but whatever you choose should make commercial sense.

Common structures include:

• Interest on overdue amounts (for example, “1.5% per month on all overdue amounts”)
• A fixed admin fee (for example, “$20 per overdue invoice to cover administration”)
• Combination approach (an admin fee plus interest, but be careful it doesn’t become excessive)

If you’re unsure what’s “reasonable”, it’s worth getting the clause drafted or reviewed so it’s tailored to your pricing and customer base.

Include Recovery Of Collection Costs (But Draft It Carefully)

If a payment becomes seriously overdue, you might need to engage a debt collector or take legal steps to recover what you’re owed.

Your terms can include a clause requiring the customer to pay reasonable costs of recovery. This can be particularly useful for B2B arrangements where invoices can be large, and debt recovery costs can add up quickly.

Just be cautious about being too aggressive in the drafting - broad “you pay all our costs” language can create disputes if it’s unclear or if costs aren’t proportionate.

Reserve The Right To Pause Work Or Suspend Supply

Late fees help, but they don’t always fix the core problem - being out of pocket while you continue delivering.

Many small businesses include a clause that allows them to suspend work, suspend access, or stop supply if invoices aren’t paid by the due date (or after a short cure period).

This can be one of the most effective practical tools you have, because it reduces your exposure.

But it needs to be drafted in a way that fits your service model and doesn’t accidentally put you in breach of your own obligations.

Practical Steps To Reduce Late Payments (Before You Rely On Late Fees)

Late fees can help set expectations - but if you’re constantly chasing payments, it’s usually worth tightening your process too.

Here are some steps that often make a big difference for small businesses.

1) Use A Quote Or Order Confirmation That Includes Payment Terms

Many payment disputes come down to “we never agreed to that”.

A simple fix is to ensure your quote, proposal, or order confirmation includes (or attaches) your payment terms and requires acceptance before work starts.

2) Invoice Promptly And Clearly

If you invoice late or the invoice is unclear, your due dates become less effective and your customer may treat it as a low priority.

Make sure your invoices include:

• the due date (not just “7 days”)
• your bank details
• a clear description of what was supplied
• reference numbers (PO numbers if applicable)
• a short summary of the late fee clause (e.g. “Overdue amounts may incur interest as set out in our terms”).

3) Follow Up With A Friendly But Firm Reminder System

Consistency matters. A simple schedule can look like:

• Day 1 after due date: polite reminder + resend invoice
• Day 7 after due date: firmer reminder + ask if there’s any issue with the invoice
• Day 14 after due date: final notice + mention late fees and potential suspension of service
• Day 21+: consider formal letter of demand and recovery options

The goal is to stay professional and calm - if it escalates, you’ll want your communications to read well in front of a third party.

4) Make Sure Your Sales And Pricing Communications Match Your Terms

If your website or sales script says “no hidden fees” or “no extra charges”, but your terms include late fees, that mismatch can create friction and disputes.

It’s worth aligning what you promise customers with what your terms actually say, so there are no surprises later.

5) Consider Deposits Or Progress Payments For Higher-Risk Jobs

If you’ve been burned by late payments before, it may be better to reduce risk upfront rather than relying on late fees later.

For example:

• a deposit before booking work in
• progress payments tied to milestones
• final payment required before delivery or handover

This is especially important for project-based service businesses.

Key Takeaways

• Late fees are generally allowed in New Zealand, but they’re much easier to enforce when your customer agreed to them upfront in clear written terms.
• Your late fee clause should be reasonable and clearly explained, with a clear trigger date and calculation method, to reduce disputes and penalty-risk arguments.
• If you deal with consumers (and some small business customers on standard terms), be extra careful that late fees are prominently disclosed and commercially justifiable under unfair contract terms rules.
• Watch for CCCFA risk where your invoicing and late fee/interest approach could amount to providing consumer credit, which can trigger additional compliance obligations.
• Late fees work best as part of a broader payment process, including strong invoice wording, consistent reminders, and the ability to suspend services for non-payment.
• If you’re unsure whether your late fees are enforceable, it’s worth getting legal advice before you roll them out across your customer base.

If you’d like help setting up payment terms (including late fees) that are clear and suited to your business, you can reach us at 0800 002 184 or team@sprintlaw.co.nz.