How To Chase Overdue Invoice Payments In NZ

Overdue payments are one of the fastest ways to turn a healthy small business into a stressed one.

You’ve done the work, you’ve issued the invoice, and (sometimes) you’ve even followed up politely - but the payment still doesn’t come in. The tricky part is balancing cashflow with relationships, while also making sure you don’t accidentally undermine your legal position.

In this guide, we’ll break down how invoicing and debt recovery generally works in New Zealand in plain English, and what you can do - step by step - to chase overdue payments the right way.

What Does NZ Invoice Law Say About Overdue Payments?

There isn’t one single “Invoice Act” in New Zealand that tells you exactly what to do when invoices are unpaid.

Instead, overdue payments are mostly a contract issue - meaning your rights depend on what you agreed with your customer (whether that agreement was written, verbal, or partly implied by your dealings).

In practice, chasing overdue payments usually involves a mix of:

• Contract law (what was agreed, when payment was due, and what happens if it’s late)
• Debt recovery processes (letters of demand, negotiation, and if needed, legal proceedings)
• Consumer and trading rules that affect how you communicate and what you promised
• Privacy obligations if you’re handling personal information while collecting the debt

Why Your Contract Matters More Than Your Invoice

An invoice is important evidence (it shows what you’re claiming and when you issued it), but your invoice doesn’t automatically create payment terms on its own.

Ideally, you want a clear agreement in place before you start work - for example, a Service Agreement or written terms that say:

• your prices (and whether they include GST)
• when payment is due (e.g. 7 days, 14 days, on completion, milestones)
• what happens if payment is late (interest, recovery costs, suspension of services)
• how you’ll deal with disputes about the work or the invoice

If you’re not sure whether you have an enforceable agreement at all, it helps to understand what makes a contract legally binding - because that’s often the foundation for recovering overdue payments.

What If You Only Have Verbal Terms?

Verbal agreements can still be legally binding in New Zealand. The hard part is proving what was agreed.

If you’re dealing with overdue payments and the customer is pushing back, the “paper trail” becomes critical. Useful evidence can include:

• quotes, estimates, or proposals (even if unsigned)
• emails and texts confirming price and scope
• purchase orders
• delivery dockets and acceptance notes
• timesheets, job reports, photos of completed work

A Quick Word On Misleading Conduct

If you’re advertising prices or making claims about what your service includes, you’ll also want to keep the Fair Trading Act 1986 in mind. You don’t want to chase overdue payments only to find the customer is alleging you misled them about price, scope, or outcomes.

This is another reason strong, written terms are worth it - they reduce confusion, and they reduce “surprise disputes” later.

How To Prevent Overdue Payments Before They Happen

If overdue payments keep happening, it’s usually a systems problem - not just a “bad customer” problem.

The goal is to reduce the chances of late payment before you deliver the work, while you still have leverage and goodwill.

1. Use Clear Payment Terms (And Make Sure They Apply)

Many small businesses put payment terms on the bottom of an invoice and assume that’s enough. The safer approach is to set your payment terms upfront and make them part of the deal.

This is where solid terms of trade can make a real difference, especially if you supply goods, do repeat jobs, or work with trade accounts.

For example, your terms might cover:

• deposits
• progress payments (weekly/fortnightly/milestone-based)
• credit limits
• late payment interest
• recovery costs
• retention of title (for goods)
• when you can suspend service for non-payment

2. Invoice Fast, Invoice Correctly

Chasing overdue payments is much harder when your invoice is unclear or incomplete.

As a minimum, make sure your invoices include:

• your legal business name and NZBN (if you have one)
• invoice number and date
• a clear due date (not just “payment terms: 14 days”)
• description of work/goods supplied
• GST amount and GST number (if registered for GST)
• payment methods (bank account details, reference to use)
• the customer’s correct name (especially important if you later need legal enforcement)

Note: invoicing and GST rules can change over time (including what information needs to be shown and how “tax invoices” work), so if you’re unsure about GST invoicing requirements for your situation, it’s worth checking the latest IRD guidance or getting accounting advice. This article is general information only and isn’t tax advice.

3. Set Expectations On Day One

A quick but powerful cashflow habit is to say, in writing, something like:

• “We invoice on completion and payment is due within 7 days.”
• “Work begins once the deposit is paid.”
• “If an invoice becomes overdue, we may pause further work until the account is brought up to date.”

It sounds simple, but it reduces the number of customers who treat your invoice as “optional”.

4. Consider Deposits Or Milestones For Higher-Risk Jobs

If the job is large, custom, or hard to “undo” (think design work, build work, marketing services, bespoke products), your risk of overdue payments is higher because you’ve already spent time and money.

Common options include:

• 50% upfront + 50% on delivery
• monthly progress invoicing
• milestone payments tied to deliverables

If you’re delivering ongoing services, having a proper Service Agreement can also clarify billing cycles, suspension rights, and what happens if the client stops paying mid-stream.

Step-By-Step: How To Chase Overdue Payments Professionally

When an invoice becomes overdue, it’s tempting to jump straight to threats. Usually, that’s not the most effective - and it can backfire if you say something inaccurate or overly aggressive.

Here’s a practical escalation path many NZ small businesses use to chase overdue payments while keeping things professional and legally clean.

Step 1: Check The Basics First (Before You Send Anything)

Before you follow up, do a quick internal check:

• Was the invoice sent to the right email/person?
• Does the invoice match the quote/purchase order?
• Has the customer raised any issues about the work (even informally)?
• Are you dealing with the right legal entity (company vs individual vs trust)?

Sometimes overdue payments happen because of simple admin issues - and fixing those quickly preserves the relationship and gets you paid faster.

Step 2: Friendly Reminder (1–3 Days Overdue)

Keep it short and easy to action. Include the invoice, amount, and payment details again. If you want to add a deadline, make it reasonable.

Example approach:

• “Just a quick reminder that invoice #123 was due on [date]. Please let us know when payment is scheduled, or if you need anything from us to process it.”

If you track timelines, it can help to be consistent about how you count dates (for example, clarifying what a business day means in your process if you’re setting internal rules like “follow up 3 business days after the due date”).

Step 3: Second Reminder + Clear Due Date (7+ Days Overdue)

If the invoice is still unpaid, the message should become firmer and more structured. At this point, include:

• the amount outstanding
• the due date (and how long it’s been overdue)
• a new deadline to pay (e.g. 48 hours or 5 business days depending on the situation)
• what happens next (e.g. “we’ll issue a formal letter of demand”)

Try to stay factual. Don’t accuse them of fraud or bad faith - you’re building a paper trail that may be read by a disputes decision-maker later.

Step 4: Pick Up The Phone (Yes, Really)

For many small businesses, the fastest way to resolve overdue payments is a phone call.

Your aim on the call is to confirm one of two things:

• They can pay - and you get a firm payment date (and ideally payment confirmation).
• They can’t pay right now - and you negotiate a payment plan in writing.

If they offer a payment plan, follow up in writing immediately. Confirm amounts and dates, and make it clear that if they miss a payment, the full balance becomes due (if that’s what you want - and if your terms allow it).

Step 5: Formal Letter Of Demand (Often 14–21 Days Overdue)

If reminders aren’t working, a letter of demand is often the next step. This is a formal written notice that:

• sets out the debt (what’s owed and why)
• includes supporting documents (invoice, contract, emails, delivery evidence)
• states a final deadline to pay
• explains what you’ll do if they don’t pay (for example, starting a claim)

Done properly, a letter of demand shows you’re serious and can prompt payment without you needing to file a claim immediately.

It’s also a key moment to get advice, because what you say (and how you say it) can affect your ability to recover costs and enforce your rights later.

When Can You Charge Interest Or Collection Costs On Overdue Payments?

Charging late payment interest or debt recovery costs can be helpful - but it’s not something you should just “add on” without checking your legal footing.

Late Payment Interest: Usually Only If It’s Agreed

In many business-to-business situations, the cleanest way to charge interest is to make it part of your agreed terms upfront (for example, in your service agreement or terms of trade).

If your contract is silent, you may still be able to claim interest in certain circumstances if the matter ends up in a formal dispute process - but that’s not guaranteed, and it often depends on the forum and the facts.

Practical tip: if you want to charge interest, make sure your terms clearly state:

• the interest rate
• when it starts applying (e.g. from the day after the due date)
• how it’s calculated (daily/monthly compounding or simple)

Debt Collection Fees And Legal Costs

Similarly, many small businesses include a clause that the customer must pay “all costs of recovery” (including debt collection agency costs and legal fees) if the invoice becomes overdue.

This can be enforceable, but it needs to be drafted carefully and applied reasonably - especially if you’re dealing with consumers.

If you’re setting your own customer-facing terms, it can help to have them properly drafted as business terms & conditions, so you’re not relying on vague wording that becomes hard to enforce when the pressure is on.

Be Careful About Pressure Tactics

When chasing overdue payments, you still need to stay professional. If you’re dealing with individuals (rather than companies), you also need to be mindful of privacy and fair conduct.

For example:

• Don’t contact someone’s employer, family, or friends about their debt.
• Don’t disclose the debt publicly (including social media).
• Don’t threaten actions you’re not actually prepared (or legally entitled) to take.

If you collect and use personal information while recovering the debt, the Privacy Act 2020 can apply - so it’s worth knowing how you’ll handle customer data and communications in a compliant way.

What Are Your Options If They Still Don’t Pay?

If your polite follow-up and demand letter haven’t worked, you generally have a few paths. The “right” one depends on the amount, the evidence you have, and whether the customer is disputing the debt or just avoiding it.

Option 1: Negotiate A Settlement Or Payment Plan (And Put It In Writing)

If the customer is willing to pay something but not everything, you might consider a negotiated settlement (for example, a reduced amount paid immediately).

Be careful here: if you accept a lower amount without documenting it properly, you can accidentally waive your right to chase the rest later.

For higher-value disputes, it’s common to document the resolution in a deed or settlement document so everyone is clear on what’s being paid, when, and what claims are released.

Option 2: Use The Disputes Tribunal (If It’s The Right Fit)

The Disputes Tribunal can be a cost-effective option for smaller claims, and it’s designed to be accessible without needing lawyers to appear.

It can work well when:

• the amount is within the Tribunal’s jurisdiction (currently up to $30,000 in many cases, or up to $20,000 unless both parties agree to the higher limit)
• you have a clear paper trail (agreement, invoice, evidence of delivery)
• the customer is disputing the invoice and you need a decision

Even if you’re confident you’re “in the right”, preparation matters - because you’ll need to show the referee why the payment is owed.

Option 3: District Court Or More Formal Recovery

For larger debts or more complex matters, you might need to consider a more formal process through the courts.

This is where getting tailored legal advice becomes important - particularly around:

• your prospects of success
• what evidence you’ll need
• the time and cost involved
• whether you can recover interest and enforcement costs

Option 4: Statutory Demand (For Debts Owed By A Company)

If your customer is a company and the debt is undisputed, a statutory demand can be an option in some cases. Generally, statutory demands are used for liquidated (clearly quantified) debts that meet the minimum threshold (often $1,000 or more), and they must comply with strict form and service requirements.

This is not something you want to DIY. If you get it wrong, you can lose leverage or end up in an unnecessary dispute. It’s a classic “get advice first” step.

Option 5: Decide When To Stop Supplying (Without Breaching Your Own Contract)

If you’re in an ongoing relationship (retainer services, recurring supply, staged project), you may want to stop work when invoices become overdue.

But you need to do this carefully. If you stop supplying in a way that breaches your agreement, you can create a dispute that distracts from the real issue: getting paid.

Having clear suspension/termination rights in your contract makes this easier to manage. If you’re unsure what your agreement allows, getting advice before you “down tools” can save you a lot of pain later.

Option 6: Know When It’s A Write-Off (And Fix The System)

Not every debt is commercially worth chasing to the end.

Sometimes the customer genuinely can’t pay, or you’re dealing with a high-friction dispute where the legal cost will exceed the recovery.

If you do decide to stop chasing, the bigger win is learning from it:

• tighten your onboarding and credit checks
• use deposits or milestone payments
• improve your quoting and scope control
• upgrade your written terms

This is how you reduce overdue payments long-term, instead of just reacting to them.

Key Takeaways

• Overdue payments are usually a contract issue in New Zealand, so your rights often depend on what was agreed (not just what’s written on the invoice).
• Reducing late payment starts “from day one” with clear payment terms, correct invoices, and a strong paper trail of what you delivered and when.
• A good overdue payments process escalates in steps: friendly reminder, firmer reminder with a clear deadline, phone call, then a formal letter of demand.
• If you want to charge late payment interest or recovery costs, it’s safest to include it clearly in your agreed terms upfront.
• If the debt still isn’t paid, you may need to consider options like a payment plan, Disputes Tribunal, court action, or (for company debtors) more formal recovery steps - and it’s worth getting tailored legal advice before you escalate.

If you’d like help tightening your payment terms, improving your contracts, or taking the right legal steps to recover overdue payments, you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.