Unpaid Invoice Recovery: What Counts as a Real Defence?
- William Slivinsky
- 3 days ago
- 5 min read
Introduction
Unpaid Invoice Recovery: What Counts as a Real Defence? When a customer refuses to pay an invoice, it can quickly become frustrating. They may ignore reminders, delay payment, or suddenly raise complaints only after the invoice becomes overdue.
But in legal terms, the key question is not simply whether the customer is unhappy. The real question is whether they have a proper legal defence to the money claimed.
This matters because not every complaint is a defence. A customer may raise side issues, confusion, or general dissatisfaction, but that does not automatically mean the invoice is not payable. Before starting unpaid invoice recovery, a business should check whether the customer has a real answer to the debt or only a weak excuse.
Unpaid Invoice Recovery: What Counts as a Real Defence?
Not every complaint defeats an invoice
A debtor may say many things when they do not want to pay.
Common examples include:
The work was not good enough.
The goods were delivered late.
The price was not properly explained.
The paperwork was unclear.
Someone else in the business did not approve the invoice.
There was another problem in the commercial relationship.
Some of these points may matter. For example, if goods were seriously defective, or the service was not provided at all, the customer may have a genuine dispute. But if the work was supplied, the price was agreed, and the complaint does not actually reduce or remove the debt, the invoice may still be recoverable.
The important point is simple: a defence must legally answer the debt.
It is not enough for the customer to say they are unhappy. They need to show why the invoice is not due, why the amount is wrong, or why they have a legal right to withhold payment.
What the case law shows
A useful example is Close Invoice Finance Ltd v Watts.
In that case, the defendants owed money under a guarantee. They tried to avoid payment by raising an issue about insurance. The court found that the insurance point did not remove the debt. It did not provide a proper answer to the guarantee claim. Even if there had been some argument about insurance charges, it would not have reduced the debt below the amount being claimed.
For unpaid invoice recovery, the practical lesson is clear:
A side complaint will not usually defeat a debt claim unless it legally affects the amount owed.
This is useful for businesses because many debtors try to shift attention away from the invoice itself.
They may complain about something connected to the wider relationship but avoid answering the basic questions:
Was there an agreement?
Was the work or product supplied?
Was the price agreed or understood?
Has the customer received the benefit?
Has the customer actually identified a legal reason for not paying?
If the answer supports the business, the debt may still be recoverable even if the customer is raising noise around it.
What evidence helps with an unpaid invoice?
Before chasing an unpaid invoice, a business should collect the evidence. This may include:
The contract or terms of business.
Purchase orders.
Email or WhatsApp messages agreeing the work.
Delivery notes.
Signed job sheets.
Photos of completed work.
Proof of delivery.
Previous invoices paid on the same basis.
Any admission by the customer that money is owed.
Chasing emails and responses.
Evidence is important because even a valid debt can become harder to recover if the paperwork is weak. For example, if there is no written agreement, no proof of delivery, and no clear price, the customer may have more room to argue.
That does not mean the debt cannot be recovered. Verbal agreements and conduct can still matter. But the more evidence the business has, the stronger the recovery position usually becomes.
When is there a real defence?
A real defence may exist where the customer can show a genuine issue that affects liability or the amount due.
Examples may include:
The goods were not delivered.
The service was not performed.
The work was seriously defective.
The agreed price was different.
The invoice includes items not ordered.
The customer has a valid set-off or counterclaim.
The wrong company has been invoiced.
There was no contract with the debtor.
But a weak excuse is different. A weak excuse may be something like:
“We are not happy generally.”
“We are waiting for someone internally.”
“We thought it would cost less,” without evidence.
“We have cashflow problems.”
“We will pay when our customer pays us,” unless the contract allows this.
These points may delay payment, but they do not always provide a legal defence.
Why this matters commercially
Unpaid invoices affect cashflow. They also take management time away from the business. But rushing into legal action without checking the strength of the debt can increase cost and risk.
A short legal validation can help identify whether the debt is strong, whether the customer has a real defence, and whether the business should send a final demand, negotiate, issue a claim, or consider another recovery route.
It can also help avoid wasting money on claims where the evidence is weak or the dispute is more complicated than it first appears.
If your issue is mainly a single unpaid invoice and you want the position checked before taking action, see our unpaid invoice recovery service:
If the matter involves wider business-to-business debt, repeated non-payment, contractual disputes, or stronger recovery options, see our commercial debt recovery service:
Key takeaway
In unpaid invoice recovery, the question is not whether the debtor is unhappy. The question is whether the debtor has a real legal answer to the money claimed.
If the customer only raises side complaints that do not affect the debt, the business may still have a strong claim.
FAQs
Can a customer refuse to pay just because they are unhappy?
Not always. If the customer has received the goods or services and the invoice is due, general dissatisfaction may not be enough. They need to show a proper reason why the invoice is not payable or why the amount should be reduced.
What is a real defence to an unpaid invoice?
A real defence is something that legally answers the debt. For example, the customer may say the goods were not delivered, the work was defective, the wrong price was charged, or they have a valid set-off. The strength of the defence depends on the evidence.
What if there was no written contract?
A written contract helps, but it is not always essential. Emails, messages, invoices, delivery records, payment history and conduct can all help prove an agreement. The issue is whether the evidence shows that the customer agreed to pay.
Can I still recover the invoice if the customer raises a complaint late?
Possibly. A late complaint may still need to be considered, but the timing can matter. If the customer only complains after repeated payment requests, that may weaken their position, especially if they previously accepted the work or made part payment.
Should I issue a claim straight away?
Not always. It is usually better to check the contract, evidence, amount claimed, debtor’s objections and commercial value first. A strong unpaid invoice claim may justify legal action, but a disputed or poorly evidenced claim may need a different approach.
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