Recovering Overpayments from Employees, Contractors and Customers in New Zealand

Overpayments happen in real businesses, not just on spreadsheets. A payroll error adds an extra week's wages, a contractor gets paid twice, or a customer receives a refund they were never entitled to. The problem is usually not spotting the error. The problem is trying to recover the money without making the legal position worse.

Common mistakes are moving too fast, deducting money from wages without proper consent, relying on a verbal promise to repay, or treating an employee, contractor and customer as if the same rules apply to all three. Another common issue is leaving the matter so long that the other side says they changed their position and cannot reasonably pay it back in the way you expected.

This guide explains what recovering overpayments from employees, contractors and customers means for New Zealand businesses, what legal issues to check before you sign or enforce repayment arrangements, where founders often get caught out, and how to handle the conversation in a practical and legally safer way.

Overview

A business can often recover money paid by mistake, but the legal route depends on who received it, why it was paid, what your contract says, and how you try to recover it. The fastest commercial approach is not always the safest legal approach, especially where wages, contractor invoices, refunds, or disputed accounts are involved.

• Identify exactly what was overpaid, when it happened, and whether it was a clear mistake or a disputed entitlement.
• Check the written contract, employment agreement, invoice terms, refund policy, and any communications about the payment.
• Treat employees, contractors and customers differently, because different legal duties and restrictions apply.
• Do not deduct money from wages or ongoing payments unless you have a lawful basis and the right consent.
• Record the overpayment clearly and propose a realistic repayment process in writing.
• Move early, but stay measured, because delay and poor communication can make recovery harder.

What Recovering Overpayments from Employees Contractors and Customers Means For New Zealand Businesses

Recovering an overpayment usually means asking for money back that was paid by mistake, but the legal and practical steps depend heavily on the relationship involved.

In a startup or SME, overpayments often happen during growth. You hire quickly, payroll gets changed mid-cycle, one person approves invoices without a second check, or customer service issues a refund while accounts processes the original payment. Small internal gaps can turn into awkward recovery discussions.

Employees

If you overpay an employee, you cannot assume you can simply claw it back from the next pay run. In New Zealand, wages are protected, and deductions from wages generally need to be authorised or otherwise lawfully permitted.

The employment agreement matters. Some agreements include a deduction clause dealing with accidental overpayments, but even then, you should act carefully and fairly. A deduction that is technically mentioned in a contract can still create issues if the amount, timing, or process is unreasonable.

Before you hire your first worker, or before you update payroll terms for an existing team, make sure your employment agreement clearly covers:

• how accidental overpayments are identified
• whether deductions may be made and in what circumstances
• how notice will be given
• whether repayment can be made by instalments
• what happens if employment ends before the overpayment is repaid

Even with a clause in place, a practical approach usually works better than an aggressive one. Explain the error, provide calculations, and propose a repayment arrangement that reflects the employee's circumstances. If the employee genuinely believed the payment was correct and has already spent it, the position can become more complicated.

Contractors

If you overpay a contractor, the issue is usually contractual rather than employment-based, but that does not make recovery automatic.

The first question is whether the payment was actually mistaken or whether the contractor says it was due under the contract, variation, milestone, or a later scope change. This is where founders often get caught. They assume an accounting discrepancy is a legal overpayment, but the contractor says it reflects agreed extra work, a minimum commitment, or an approved charge.

Before you classify someone as a contractor, and before you sign, your contractor agreement should spell out:

• the pricing model, including hourly, milestone, retainer, or fixed fee arrangements
• how invoices must be submitted and approved
• what happens if an invoice is incorrect or paid in error
• whether set-off or future deductions are allowed
• how disputes about fees are handled
• what records the contractor must provide to support charges

If your contract is silent, you may still be able to seek repayment on the basis that the money was paid by mistake. But if there is an ongoing relationship, you need to think carefully about whether to seek immediate repayment, offset future invoices, or negotiate a written adjustment.

Customers

If a customer has been overpaid, perhaps through a duplicate refund, pricing glitch, rebate error, or mistaken credit, the situation moves into ordinary contract and consumer law territory.

If your customer is another business, the dispute will usually turn on your contract, invoice records, and communications. If your customer is a consumer, your communications also need to stay clear, fair, and accurate. You do not want a recovery message that looks misleading, threatening, or unsupported. The Fair Trading Act and your general contractual conduct still matter.

Examples of customer overpayment situations include:

• issuing a refund twice for the same order
• crediting an account with the wrong amount
• paying out a promotional rebate incorrectly
• transferring settlement funds to the wrong customer
• honouring a discount or coupon in error and later trying to reverse it

Some of these are easier to recover than others. If a mistaken refund landed in a customer's bank account, you may have a stronger basis to request repayment than if your own checkout system offered a price and the customer completed the transaction in the ordinary way. The exact facts matter.

The business reality

The legal answer is only part of the picture. You also need to decide whether recovery is commercially worth it, whether preserving the relationship matters more, and whether a repayment plan will achieve a better result than a hard demand.

For many SMEs, the safest path is to separate the accounting question from the legal one. Confirm the numbers first. Confirm the contract terms second. Then communicate clearly, in writing, without making assumptions you cannot prove.

Legal Issues To Check Before You Sign

The best time to deal with overpayments is before the mistake happens, because clear contracts and processes make recovery much easier.

1. Does the agreement deal with mistaken payments?

A well-drafted agreement should say what happens if one party is overpaid by mistake. That includes the right to notify the error, require supporting calculations, and agree how repayment will occur.

Before you sign a contract, check whether it covers:

• accidental overpayments
• incorrect invoices
• duplicate payments
• set-off rights against future amounts payable
• timing for repayment
• what happens if the parties dispute the amount

This matters in employment agreements, contractor agreements, supplier arrangements, franchise documents, service terms, and customer trading terms.

2. Can you make deductions lawfully?

You should never assume that because you paid money by mistake, you can just take it back the same way.

For employees, deductions from wages require particular care. The authority to deduct needs to be lawful, and the process should be fair and clearly documented. If there is no valid authority, making a unilateral deduction can expose the business to an employment dispute even where the original overpayment is real.

For contractors and commercial counterparties, the issue is whether your contract permits set-off or adjustment against future payments. If it does not, withholding future invoices can itself become a breach.

3. Is the overpayment genuinely undisputed?

You need to separate a mistaken payment from a disagreement about what was owed.

Before you rely on a verbal promise, pull together the documents. Review timesheets, purchase orders, approved variations, payroll settings, commission rules, refund logs, bank records, and email approvals. Many recovery efforts fail because the business demands repayment before it has checked whether the recipient may have had a colourable claim to the money.

4. Has the recipient changed position?

A person or business who received money in good faith may argue they changed their position in reliance on the payment.

In plain English, that means they thought the money was theirs, used it, and would now be unfairly disadvantaged if they had to repay it immediately or in full. This does not automatically defeat recovery, but it can affect how strong your claim is and what outcome is realistic.

This issue comes up often with employees who received wages through a payroll mistake and used them for ordinary living expenses, or customers who spent a mistaken credit without noticing anything unusual.

5. Are you communicating in a legally safe way?

Your first message about an overpayment should be factual, calm, and specific. Do not accuse the other party of dishonesty unless you have very clear evidence and have taken advice.

A strong recovery communication usually includes:

• the date and amount of the payment
• why you say it was an overpayment
• the documents or calculations supporting that view
• what you want the other party to do next
• a reasonable timeframe for response
• an invitation to raise any disagreement promptly

That approach reduces the chance of the matter escalating because of tone rather than substance.

6. Do your internal processes support recovery?

Good recovery outcomes usually start with boring admin done properly.

Before you sign off payments and before you spend money on setup for a growing finance function, make sure your business has:

• clear payment approval levels
• payroll review checks
• invoice matching processes
• written refund approval rules
• a record of who authorised exceptions
• consistent contract storage

Without these, proving the overpayment and explaining it convincingly becomes much harder.

7. Are there related tax or accounting consequences?

An overpayment can have payroll, GST, accounting, and reporting consequences. The legal recovery process should line up with your books and records.

You should speak with your accountant or tax adviser about the accounting treatment, especially if the overpayment crosses reporting periods, affects PAYE-related calculations, or involves credit notes and refunds.

Common Mistakes With Recovering Overpayments from Employees Contractors and Customers

The biggest mistakes usually happen when a business treats recovery as a pure accounting task instead of a legal and relationship issue.

Making immediate deductions without checking authority

This is one of the most common payroll errors after the overpayment itself. A founder sees the mistake, instructs payroll to deduct the amount next cycle, and assumes that ends the matter.

If the deduction is not properly authorised, the business may create an employment claim while trying to fix a payroll one. Even where the employee accepts the overpayment happened, the deduction method still matters.

Using vague or outdated contracts

If your employment agreement or contractor agreement does not deal with mistaken payments, you lose leverage at the exact moment you need clarity.

Older templates often talk generally about deductions or invoicing but say nothing specific about duplicate payments, overpaid commissions, mistaken refunds, or set-off rights. That gap creates room for dispute.

Relying on verbal conversations

A phone call may smooth things over, but it should not be your only record.

If the other party agrees to repay, confirm the arrangement in writing. Set out the amount, dates, instalments if any, what happens if a payment is missed, and whether the arrangement fully resolves the issue. Without that written record, later disagreement is common.

Overreaching where the entitlement is genuinely arguable

Sometimes the payment was not clearly mistaken. It may sit in a grey area because of poor drafting, verbal approvals, unclear commission rules, or project scope creep.

This is where founders often get caught before they accept the provider's standard terms or before they rely on a verbal promise. If the contract leaves room for argument, a demand for immediate repayment may harden the dispute rather than solve it.

Ignoring employee relations and customer goodwill

Legal rights matter, but so do practical consequences. A heavy-handed demand to a long-term employee or loyal customer can damage trust far beyond the amount in dispute.

That does not mean you should give up recovery. It means you should choose a proportionate response, especially where the mistake is plainly yours and the recipient did not contribute to it.

Waiting too long

Delay makes everything harder. Records go missing, memories fade, staff leave, and the recipient becomes more likely to say they reasonably assumed the payment was correct.

Raise the issue promptly once you have checked the facts. Speed helps, but accuracy still comes first.

Failing to distinguish between employees, contractors, and customers

These groups are not interchangeable. Employment law concerns, contractual set-off rights, and consumer-facing communications require different handling.

A repayment email that works for a commercial supplier may be unsuitable for an employee. A wage deduction clause does not help with a customer refund error. The right recovery strategy depends on the relationship.

Missing the chance to settle sensibly

Not every overpayment should become a formal dispute. If the amount is moderate and the relationship matters, a repayment plan, account credit, deed of acknowledgement, or agreed set-off may be the most efficient result.

The main risk is documenting this poorly. Settlement terms should be clear, signed where appropriate, and consistent with the underlying contract and legal obligations.

FAQs

Can I deduct an accidental overpayment from an employee's next pay?

Not automatically. You need to check the employment agreement, any deduction authority, and whether the deduction is lawful and fair in the circumstances. Taking money back unilaterally can create a separate employment issue.

Can I recover a duplicate payment made to a contractor?

Often yes, but first confirm it was truly a duplicate or mistaken payment rather than an amount the contractor says was due under the contract. Your agreement should ideally deal with incorrect invoices, repayment, and set-off.

What if a customer says they already spent the mistaken refund?

You may still be able to seek repayment, but the facts matter. Good faith receipt, fairness, your own communications, and the nature of the transaction can all affect the strength of your position and the practical outcome.

Should I send a formal demand straight away?

Usually not as a first step. Start with a clear factual explanation, supporting calculations, and a reasonable request to discuss repayment. A formal demand may be appropriate later if the matter is undisputed and the other party will not engage.

What should be in my contracts to help with overpayment recovery?

Include clauses dealing with mistaken payments, deductions where lawful, set-off rights, invoice disputes, repayment timing, and what happens if the relationship ends before the amount is repaid.

Key Takeaways

• Recovering overpayments from employees, contractors and customers is possible in many cases, but the legal path depends on the relationship, the contract, and the facts.
• Employees require special care, especially if you are considering deductions from wages.
• Contractor and customer overpayments often turn on contract wording, invoice records, refund terms, and whether the payment was truly mistaken or actually disputed.
• Before you sign, make sure your agreements cover accidental overpayments, incorrect invoices, set-off rights, and repayment processes.
• Move promptly, confirm the numbers, communicate calmly in writing, and avoid aggressive recovery steps before checking your legal basis.
• Written repayment arrangements are far safer than verbal understandings, particularly where instalments or future offsets are involved.

If you want help with employment agreement clauses, contractor agreement repayment terms, customer refund disputes, and deduction arrangements, you can reach us on 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.