Unpaid invoices are one of the most common causes of cash flow pressure for businesses in the UK. Whether you are an SME, contractor, consultant or supplier, late or non-payment can quickly affect profitability and day-to-day operations. Understanding the legal options available allows businesses to recover debts efficiently while preserving commercial relationships where possible.
When does an invoice become legally payable?
An invoice becomes payable in accordance with the payment terms agreed between the parties. These terms are usually set out in a written contract, purchase order or standard terms and conditions. Where no express payment period has been agreed, payment is generally expected within a reasonable time.
Under the Late Payment of Commercial Debts (Interest) Act 1998 and Late Payment of Commercial Debts Regulations 2002, businesses are often entitled to charge statutory interest and compensation on overdue invoices in business-to-business transactions. This can strengthen a creditor’s position and encourage early settlement.
Before taking legal action, it is important to confirm that the invoice has been properly issued, that the goods or services were delivered as agreed, and that there is no genuine dispute as to quality or performance.
First step: chasing payment commercially
In many cases, unpaid invoices can be resolved without formal proceedings. A structured approach usually includes:
- a polite reminder shortly after the due date
- a follow up email or call confirming the outstanding balance
- a formal demand for payment setting a clear deadline
Maintaining a professional tone is important, particularly where an ongoing commercial relationship exists. Many payment delays arise from administrative issues rather than an unwillingness to pay.
If payment is still not received, the next step is usually a formal Letter Before Action.
Letter Before Action
A Letter Before Action is a formal demand sent before court proceedings are issued. It should set out:
- the amount owed
- the basis of the debt
- payment terms and due date
- any contractual or statutory interest claimed
- a deadline for payment, typically 7 to 14 days
The letter also demonstrates compliance with the Pre Action Protocol for Debt Claims where applicable. In practice, many debts are settled at this stage once the debtor understands that legal action is imminent.
Issuing court proceedings for unpaid invoices
If payment is not made, a creditor may issue a claim in the County Court or High Court depending on the value and complexity of the debt.
Court proceedings typically involve issuing a claim form, serving particulars of claim, and obtaining judgment either by admission, default, or after trial.
If judgment is obtained and the debtor still fails to pay, enforcement options include instructing High Court Enforcement Officers, obtaining a charging order, or applying for a third party debt order.
Statutory demand and winding up petition
Where an unpaid invoice remains outstanding and the debt is undisputed, a creditor may consider insolvency action rather than ordinary court proceedings.
A statutory demand is a formal demand for payment served on a company where the debt exceeds £750 and is due and payable. The debtor company has 21 days to pay, secure the debt, or reach agreement. If it fails to do so, the creditor may rely on the statutory demand as evidence that the company is unable to pay its debts.
If payment is still not made, the creditor may present a winding up petition seeking to place the company into compulsory liquidation. Once a petition is issued and advertised, the company’s bank accounts may be frozen and its ability to trade can be seriously affected, which often results in payment or settlement before the hearing.
However, insolvency procedures should only be used where the debt is genuinely undisputed. The court will not determine contractual disputes within winding up proceedings, and a petition based on a disputed debt may be dismissed with adverse costs consequences. As discussed in our article on Preventing winding up petitions in construction: the importance of record keeping, winding up proceedings should not be used as a form of debt recovery where there is a genuine dispute, as this may amount to an abuse of process.
For that reason, early legal assessment is important before taking this step.
Common defences raised by debtors
Debtors may argue that:
- the goods or services were defective
- the work was incomplete
- payment terms were varied
- there was a set off or counterclaim
Early legal assessment is important to determine whether the debt is genuinely disputed or whether non-payment is simply tactical delay.
Recovering interest and costs
In many cases, creditors can recover statutory interest at 8 percent above the Bank of England base rate together with fixed compensation and reasonable recovery costs. Contractual interest provisions may also apply where agreed in advance.
Legal costs recovery depends on the value of the claim and the court track. For smaller claims, recovery of legal costs is limited, which should be considered when deciding on strategy.
Preventing unpaid invoices in the future
The most effective way to avoid debt recovery proceedings is prevention. Businesses should ensure that contracts clearly define payment terms, late payment interest, suspension rights and dispute resolution procedures. Credit checks and staged payments for higher value work can also reduce risk.
Many disputes arise not from unwillingness to pay but from unclear contractual arrangements or poor payment processes.
How legal advice can help
Early legal advice often improves recovery prospects and reduces overall costs. A solicitor can assess whether the debt is suitable for court proceedings, settlement negotiations or insolvency action, and ensure compliance with procedural requirements.
For businesses operating internationally or across multiple jurisdictions, early strategy is particularly important where enforcement or jurisdiction issues may arise.
If your business is facing unpaid invoices, taking prompt and proportionate action can make the difference between recovery and write off.
This article is for general information only and does not constitute legal or professional advice. Please note that the law may have changed since this article was published.
