Can You Legally Sell a Debt to a Collection Agency in NZ?

If you’re running a small business, unpaid invoices can quickly turn from “a bit annoying” into a real cashflow problem. When you’ve chased a customer, sent reminders, and tried to negotiate a payment plan, it’s normal to start wondering whether there’s a faster option.

One common approach is to sell the debt to a third party (often a debt buyer or collection agency) so they take over the recovery process. In legal terms, this is usually done through debt assignment.

In New Zealand, debt assignment can be lawful and practical - but only if it’s done properly. If you get the details wrong, you can create disputes about who is entitled to be paid, expose your business to privacy complaints, or undermine your ability to enforce the debt.

What Is Debt Assignment (And How Is It Different From Debt Collection)?

Debt assignment is when you transfer your legal rights to a debt to another party. If the assignment is done in a way that qualifies as a “legal assignment” under New Zealand law (including the right formalities and notice), the “assignee” (the buyer/recipient of the debt) can generally enforce the debt in their own name. If those steps aren’t met, the assignment may still operate as an “equitable assignment” - but enforcement can be more complicated (for example, the assignee may need to involve the original creditor in court proceedings).

This is different from debt collection, where you still own the debt, but you appoint someone else to chase payment on your behalf (as your agent).

Why This Distinction Matters

From a small business perspective, the “assignment vs collection” difference changes:

• Who legally owns the debt (and, depending on how the assignment is structured, who can sue for it)
• Who the customer should pay (you or the new owner)
• How you handle customer data when you share information with a third party
• Your ongoing risk (for example, if you give warranties about the debt’s accuracy when selling it)

Common Examples Of Debt Assignment In Practice

Debt assignment can show up in a few common ways for NZ businesses:

• You sell a batch of overdue invoices to a specialist debt purchaser for an upfront amount (often discounted).
• You restructure your business and transfer debtor accounts between entities (for example, from a sole trader to a company, or between group companies).
• You sell your business and the buyer takes over your receivables (this is still a form of assignment, even if it’s part of a bigger transaction).

Because debt assignment is a legal transfer of rights, the paperwork and process matter a lot more than people expect.

Is It Legal To Sell A Debt To A Collection Agency In New Zealand?

Generally, yes - selling a debt to a collection agency can be legal in New Zealand, provided the debt is valid and the assignment is done correctly.

Most business debts (like unpaid invoices for goods or services) are capable of being assigned, unless:

• the underlying contract prohibits assignment (or restricts it without consent),
• the debt is not actually owed (for example, there’s a genuine dispute about defective goods or services), or
• the assignment is not properly documented (or handled in a way that creates uncertainty about enforceability, such as unclear terms or failure to give the required notice for a legal assignment).

Check Your Contract First: Is Assignment Allowed?

Before you sell a debt, you should check the agreement you had with the customer. This might be:

• your signed service agreement or client contract,
• your online checkout terms, or
• your Terms Of Trade (common for trade, wholesale, and B2B service businesses).

Some contracts include an “assignment clause” saying you can assign your rights without needing the other party’s consent. Others may restrict assignment (or require consent first). If you breach those terms, it can trigger a dispute or give the customer leverage to resist payment.

Consumer Debts vs Business Debts

If your unpaid invoices relate to consumer customers (rather than business-to-business trading), your approach needs extra care. Consumer law issues can arise if the customer alleges they don’t owe the money because of quality issues or misleading conduct.

Even in a B2B context, claims about misrepresentation or unfair pressure can complicate enforcement. The key takeaway is simple: don’t assume “invoice issued” automatically means “debt collectible” - especially if the customer is disputing it.

How Does Debt Assignment Work In NZ (What Do You Need To Do)?

Debt assignment is all about transferring rights clearly. In practice, the process usually involves:

1. confirming the debt exists and is enforceable,
2. documenting the assignment in writing, and
3. notifying the debtor (your customer) that the debt has been assigned.

1) Confirm The Debt Is Real, Due, And Not Disputed

It sounds obvious, but this is where many businesses get caught out. If the customer has a legitimate dispute (for example, they say your work was incomplete or the product was faulty), selling the debt doesn’t magically make that problem disappear - it just transfers the headache to someone else, and you may still have liability under the sale terms.

Before proceeding, it helps to check:

• What your contract says about payment timing and late fees
• Whether you have evidence the goods/services were delivered (emails, signed acceptance, delivery dockets)
• Whether any credits, refunds, or offsets apply
• Whether the amount claimed matches your invoice and pricing terms

2) Put The Assignment In Writing

To avoid ambiguity, a written assignment document is the norm. In New Zealand, if you want the assignee to be able to enforce the debt in their own name as a legal assignment, you generally need to meet the relevant requirements under the Property Law Act 2007 (including a written assignment signed by the assignor, and express written notice to the debtor). If those steps aren’t satisfied, the assignment may still be effective in equity, but enforcement and process can be less straightforward.

Depending on your situation, the document might be a short-form assignment clause in a broader agreement, or a standalone assignment deed.

For many businesses, this is where a properly drafted Deed of Assignment is useful - especially when you’re transferring contractual rights and related enforcement rights (not just a single invoice amount).

At a practical level, your debt assignment document should clearly cover things like:

• What is being assigned (specific invoice numbers, debtor names, amounts, or a defined portfolio)
• The purchase price (if you are selling the debt)
• What information will be provided to the buyer (contracts, invoices, communications, notes)
• Warranties (for example, that the debt is valid, not previously assigned, and not settled)
• Responsibility for disputes (what happens if the customer counterclaims or alleges breaches)
• Confidentiality and privacy handling

3) Notify The Debtor (So They Know Who To Pay)

Even if the assignment is valid between you and the buyer, the customer usually needs to be told - otherwise they might keep paying you (or claim they weren’t aware they had to pay someone else). Also, if you intend the transfer to operate as a legal assignment under the Property Law Act 2007, express written notice to the debtor is generally a required step.

A proper notice typically confirms:

• the debt has been assigned,
• the new owner’s details,
• where payment should be made, and
• the effective date of the assignment.

From a risk-management perspective, clear written notice reduces confusion and helps prevent delays, duplicate demands, and complaints that “this is a scam”.

What Are The Key Legal Risks For Businesses Selling Debts?

Debt assignment can be a smart commercial move, but it’s not something to do on autopilot. Here are the key legal and practical risks to watch for as a NZ business owner.

Privacy And Customer Data (Privacy Act 2020)

When you assign a debt, you’ll almost always need to share information about the debtor - invoices, contact details, communication history, and sometimes details about the underlying transaction.

In New Zealand, the Privacy Act 2020 requires you to handle personal information responsibly. Even if you’re dealing with a “business customer”, you may still hold personal information (for example, if it’s a sole trader, or you have an individual contact person’s details).

As a general rule, you should make sure you only disclose what’s necessary for the debt recovery/assignment, and that you have a lawful basis to disclose it. Having a clear Privacy Policy that explains how you collect, use, and share personal information can make this much easier to manage.

Misleading Or Aggressive Recovery Conduct

Even after you assign the debt, your brand reputation can still be impacted by how the debt is handled - especially if customers feel pressured or misled.

While the assignee/agency will have their own obligations, it’s still a good idea to vet who you work with and ensure the arrangement is documented clearly. If you’re appointing someone to collect (rather than assigning), a tailored Debt Collection Agreement can help set expectations about conduct, reporting, and compliance.

“Bad Debt” Warranties And Buy-Back Clauses

Many debt sale arrangements include warranties like:

• the debt is legally owed and payable,
• there are no known disputes,
• the amount is accurate, and
• you have the right to assign it.

Sometimes there’s also a buy-back or clawback mechanism - meaning if the debtor successfully disputes the invoice, you may have to refund the purchase price or replace the debt with another account.

This is why it’s important not to treat debt assignment as “set and forget”. You’re often still making legal promises about the quality of what you’re selling.

Security Interests And Competing Claims

In some situations, other parties may have rights connected to your receivables (your customer debts). For example, if your business has borrowed money and granted security, your lender may have an interest in your receivables.

This can become relevant if you’ve signed a General Security Agreement (or similar security document). If receivables are part of secured collateral, selling/assigning them without checking your obligations can trigger default risks or disputes about priority.

This is one of those areas where a quick legal check can save you a lot of trouble later.

What Should You Put In A Debt Assignment Agreement?

A good debt assignment document isn’t just about saying “we assign the debt.” It should be commercially realistic and protect you if things go sideways.

Depending on the deal, your agreement may be drafted as a deed or contract. Either way, key clauses often include:

Clear Identification Of The Assigned Debt

• Debtor legal name and address
• Invoice references and dates
• Principal amount, interest, and fees (if applicable)
• Any supporting contracts or purchase orders

Purchase Price And Payment Mechanics

• Upfront payment vs instalments
• Whether the price depends on actual recovery
• GST treatment (this can be fact-specific - consider getting accounting advice, as Sprintlaw doesn’t provide tax advice)

Information Sharing And Record-Keeping

• What documents you’ll provide
• Timeframes for providing records
• What happens if documents are incomplete

Warranties, Indemnities, And Dispute Allocation

This is often the “make or break” part of the deal. For example:

• If the debtor says the work was defective, who handles that dispute?
• If the debtor counterclaims, who pays legal costs?
• If the debt was already partially paid, what happens?

If you’re not sure whether the draft terms are balanced, getting a Contract Review can be a very worthwhile step before you sign.

Notice Requirements

• Who sends the notice of assignment
• What it must say
• How it must be delivered (email, post, etc.)

Confidentiality And Privacy

In practice, this should align with your privacy obligations and the buyer/agency’s handling processes.

Debt assignment can be completely legitimate - but you still want to avoid over-sharing data, sharing it insecurely, or disclosing sensitive information that isn’t needed to enforce the debt.

Key Takeaways

• Debt assignment is a legal transfer of your right to be paid, and it’s different from simply hiring a debt collector to chase payment on your behalf.
• It’s generally legal to sell a debt to a collection agency in New Zealand, but you should check whether your underlying contract allows assignment and whether the debt is genuinely owed.
• A proper written document is important. If you want the assignee to enforce the debt in their own name as a legal assignment, you’ll generally need to meet the Property Law Act 2007 requirements (including written assignment and express written notice to the debtor); otherwise it may still be effective as an equitable assignment, but enforcement can be more complex.
• Notifying the debtor is a practical (and often essential) step, so they know who to pay and to reduce confusion or payment disputes.
• Be careful with personal information when transferring debt-related records - the Privacy Act 2020 can still apply, and a clear Privacy Policy helps set expectations.
• If your receivables are tied up in security arrangements (like a general security agreement), you may need to check lender restrictions before selling or assigning debts.

If you’d like help documenting a debt assignment properly (or you’re not sure whether you should assign the debt or use an agency arrangement), we’re happy to help. You can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.