UK small business guide: recovering late payments and charging interest

Introduction: the silent drain on UK SMEs

Late payments cripple cash flow and hinder growth. UK SMEs are collectively owed £70.4 billion in late payments annually, and 61% of small businesses say late payments are preventing them from reaching their full potential. This guide shows you how to prevent late payments before they happen, recover what you're owed, and charge interest under the law. We'll also show you how tools like Stored — with built-in digital invoicing and pay by link — help you get paid faster in the first place.

The pervasive problem of late payments

Over 60% of invoices are paid late. One late payment triggers a domino effect: your cash flow suffers, you struggle to pay suppliers, and the problem spreads down the supply chain. The impact is real. Late payments hit cash flow, payroll, and growth. Many businesses close because of late payments alone. Understanding this problem is the first step to fixing it.

Why prompt payments are critical for small business growth

On-time payments fuel growth. Healthy cash flow lets you invest in equipment, hire staff, develop new services, and seize opportunities. Late payments force tough choices: delay investments, rack up credit card debt, or just tread water. Businesses with reliable cash flow grow faster, hire more, and adapt to change. That's why the UK has laws protecting you — to ensure fair compensation when payment is delayed.

A proactive approach: beyond just chasing debts

Prevention beats recovery. The best way to avoid late payments is clear systems and communication from day one. Many late payments happen because payment terms are vague, contracts are unclear, or invoices are sent late. Fix these and you'll dramatically reduce overdue invoices — and save yourself weeks of chasing. This also builds better customer relationships. Clear expectations up front mean fewer disputes later.

Understanding the UK legal framework for commercial debts

The UK legal framework provides a solid foundation for businesses to tackle the issue of late payments. Understanding these rights empowers SME owners to take decisive action when faced with overdue invoices, ensuring they are not left to absorb the financial burden of their customers' delays. The government has increasingly focused on strengthening these protections, recognising the detrimental impact of late payments on the backbone of the British economy. These payment laws are designed to create a fairer playing field for small businesses in their transactions.

The Late Payment of Commercial Debts Act 1998

The Late Payment of Commercial Debts Act 1998 (as amended, often referred to as the Late Payments Act) is the cornerstone legislation designed to protect businesses from late payments. It grants businesses the automatic right to charge interest on overdue invoices, regardless of whether this is explicitly stated in the contract. This means that if a customer fails to pay a commercial debt within the agreed payment terms, or within a reasonable time if no terms are specified (typically 30 days), statutory interest can be applied. This legislation applies to all business-to-business transactions, ensuring that a small business providing goods or services to another business is not left out of pocket due to delayed payment. This is a fundamental aspect of UK payment laws.

How the Act protects small businesses

The Act provides several crucial protections for small businesses. Firstly, it establishes a statutory right to claim interest on overdue commercial debts. Secondly, beyond just interest, it allows for the recovery of reasonable debt recovery costs incurred due to the late payment, providing a financial incentive for prompt payment and a means to recoup expenses associated with chasing debts. This dual protection acts as a significant deterrent to late payments and offers a tangible remedy for businesses that are financially impacted. The UK Government has also signalled its intent to further strengthen these protections, with plans to introduce legislation setting maximum payment terms of 60 days for all large firms when paying smaller suppliers, reducing to 45 days after a transition period, and potentially further to 30 days in the future. This demonstrates a clear commitment to improving cash flow for small businesses.

Statutory interest: your right to charge on overdue invoices

One of the most powerful tools available to small businesses under the Late Payment of Commercial Debts Act is the right to charge statutory interest. This interest is calculated at a rate of 8% above the Bank of England base rate. For instance, if the Bank of England base rate is 5%, the statutory interest rate would be 13%. This interest accrues automatically from the day after the payment date was due, until the date of actual payment. This mechanism not only compensates businesses for the loss of use of their money but also serves as a significant deterrent, making it financially disadvantageous for customers to delay payment. New mandatory interest on late payments will be introduced, requiring all commercial contracts to include statutory interest set at 8% above the Bank of England base rate plus a fixed sum for debt recovery costs. This right is fundamental to protecting small business cash flow.

The role of the Small Business Commissioner

The Small Business Commissioner (SBC) plays a crucial role in supporting small businesses dealing with late payments. The SBC acts as a dedicated point of contact, offering guidance and assistance to resolve payment disputes. While the SBC does not have direct enforcement powers to impose penalties on late-paying firms, it can investigate payment disputes and recommend resolutions. The UK Government is committed to enhancing the SBC's capabilities, with plans for it to recover "three times more overdue invoices in 2025 than in 2024," according to Small Business Commissioner Emma Jones CBE [Startups.co.uk]. The SBC can be a valuable resource for SME owners seeking impartial advice and a pathway to resolving persistent payment issues, working in conjunction with bodies like the Federation of Small Businesses.

Government initiatives and codes: Prompt Payment Code and Fair Payment Code

Beyond specific legislation, the UK Government has championed initiatives aimed at promoting a prompt payment culture. The Prompt Payment Code (PPC) is a voluntary initiative that commits signatories to paying their suppliers within agreed payment terms, typically 30 days, and requires them to pay 95% of their invoices within this timeframe. While voluntary, adherence to the code signifies a commitment to fair payment practices and is often a consideration for larger organisations and those engaging with public sector contracts. Furthermore, firms bidding for large government contracts are subject to stricter payment terms. For example, from April 1, 2024, companies bidding for contracts over £5 million must demonstrate they pay their own invoices within an average of 55 days, tightening to 45 days in April 2025, and to 30 days in the coming years [techUK, November 2023]. These measures signal a shift towards greater accountability and improved cash flow for small businesses. The Fair Payment Code also aims to promote better payment behaviours across the economy.

Proactive prevention: setting up for prompt payments from day one

The most effective strategy for any small business is to prevent late payments before they occur. This requires a structured approach that embeds clear payment terms into every client interaction and contractual agreement. By focusing on proactive measures, businesses can significantly minimise the need for debt recovery efforts, saving valuable time and resources. This involves meticulous planning and clear communication from the initial stages of a business relationship, ensuring that payment dates and expectations are unambiguous.

Clear and comprehensive payment terms in contracts

The foundation of prompt payment lies in clearly defined payment terms within all contracts. These terms should explicitly state the agreed payment date, acceptable payment methods, and the consequences of late payment, including the application of statutory interest and debt recovery costs. Ambiguity in contracts is a breeding ground for dispute resolution issues and delays. Ensure that your payment terms are not only clearly written but also prominently displayed on invoices and other relevant documents. This transparency sets clear expectations from the outset, leaving no room for misinterpretation. For construction contracts, ensuring clarity around milestone payments and retention clauses is also paramount.

Effective customer vetting and credit checks

Before commencing any significant service or supply agreement, it is prudent to conduct thorough vetting of potential customers. This can involve researching their business history, checking their credit rating, and seeking references. For larger contracts, formal credit checks can provide valuable insights into a customer's financial stability and payment history. While not foolproof, these checks can help identify potential red flags and mitigate the risk of engaging with customers who have a propensity for late payments. This due diligence is a small investment that can prevent significant financial headaches down the line and protect your cash flow.

Strategic invoicing practices

The way you invoice can significantly influence how quickly you get paid. Ensure your invoices are:

• Timely: Send invoices promptly after delivering goods or completing services. Delaying invoicing can lead to the customer delaying payment.
• Clear and accurate: Invoices should contain all necessary information, including a unique invoice number, clear description of goods/services, quantities, unit prices, total amount due, and your clear payment terms.
• Professional: A well-formatted, professional invoice conveys competence and seriousness, encouraging customers to treat it with similar importance.
• Easily accessible: Provide digital copies of invoices via email or a client portal, making it easy for customers to access and process them.

An invoice reminder email sent promptly after the payment date can also be an effective tool. For construction contracts, ensuring that milestone payments are clearly detailed on invoices is crucial.

Securing payments: deposits and milestone payments

For larger projects or ongoing service agreements, consider incorporating mechanisms that secure payments upfront or throughout the project lifecycle. Requiring a deposit before commencing work can ensure commitment from the customer and provide immediate cash flow. Milestone payments, where portions of the total fee are paid upon the completion of specific project phases, also help manage cash flow and reduce the risk of non-payment for work already completed. This is particularly relevant in sectors like construction contracts. These strategies ensure that cash flow is managed proactively, rather than reactively, and are an integral part of managing payment terms.

Mastering interest charges: from legal right to business strategy

While the legal right to charge interest on overdue invoices is well-established under payment laws, its effective implementation requires a strategic approach that balances financial recovery with customer relationship management. Understanding how to apply interest correctly and communicating this policy effectively can transform it from a punitive measure into a valuable business tool, ensuring fair compensation for delayed payments. This is key to effective debt recovery.

Implementing your interest policy effectively

Once your payment terms are established, ensure your interest policy is clearly communicated. This can be included in your standard terms and conditions, on your invoices, and within your contracts. When an invoice becomes overdue, the next step is to calculate the statutory interest. The formula is: (Outstanding Invoice Amount × (8% + Bank of England Base Rate) × Number of Days Overdue) / 365. For example, on a £10,000 invoice that is 30 days overdue, with a Bank of England base rate of 5%, the interest would be (£10,000 × 0.13 × 30) / 365 = £106.85. You are also entitled to claim a fixed sum for debt recovery costs, which is £100 for debts between £1,000 and £9,999.99. Many businesses use accounting software to automate these calculations and ensure accurate application of interest on late payments.

When and how to apply interest charges

The decision to apply interest should be made strategically. While the legal right exists from the day after the payment date was due, some businesses choose to offer a short grace period (e.g., 7 days) before applying interest to foster goodwill. When applying interest, it's crucial to communicate this clearly to the customer, preferably in writing, outlining the calculation and the total amount now due. This can be done via a formal reminder letter or an updated invoice that details the accrued interest. This process is an important part of debt recovery and ensures late payment law is being upheld.

Strategic use of interest: more than just a penalty

Interest charges should be viewed not just as a penalty for late payment but as a proactive strategy to incentivise timely payments. By clearly stating and consistently applying your interest policy, you signal to customers that prompt payment is a non-negotiable aspect of your business relationship. This can lead to a behavioural shift, with customers prioritising your invoices to avoid additional costs. It also provides a mechanism for compensation, ensuring your business isn't disadvantaged by the customer's delay. This is particularly important in the current economic climate, with the rising cost of living impacting many businesses. Effective credit and collections strategies leverage this right.

Maintaining customer relationships while charging interest

Charging interest can sometimes strain customer relationships. To mitigate this, maintain open communication. If a customer approaches you with a genuine payment difficulty, consider offering a payment plan. However, if interest is due, present it professionally, explaining that it's a standard part of your policy designed to ensure fairness for all clients. In many cases, the customer will pay the interest to avoid further escalation or a damaged credit rating. The key is to be firm but fair, ensuring your policy is applied consistently and transparently. For genuine dispute resolution, clear communication is essential before resorting to interest charges.

Effective payment recovery: your step-by-step guide for overdue invoices

Despite robust prevention measures, some invoices will inevitably become overdue. Having a clear, escalating process for debt recovery is essential to minimise financial loss and maintain control over your cash flow. This structured approach ensures that all necessary steps are taken systematically to resolve the issue.

Gentle reminders: the first steps

The initial step in recovering an overdue invoice is a polite reminder. This can be an email or a phone call, simply pointing out that the invoice appears to be outstanding and requesting immediate payment. Often, late payments are due to administrative oversights, and a gentle reminder is all that's needed. Sending these reminders shortly after the payment date (e.g., 2-3 days) is crucial to act swiftly and demonstrate proactive management of your receivables.

Escalating internal communication

If the initial reminder yields no response, it's time to escalate internal communication. This could involve sending a more formal letter or email, referencing the original invoice number and payment date, and clearly stating that statutory interest and potential debt recovery costs may apply if payment is not received promptly. The tone should become firmer, but still professional. This escalation signals the seriousness of the situation. Many small businesses spend up to £5,200 per year in lost time and resources chasing overdue payments [Federation of Small Businesses, 2025], highlighting the importance of an efficient process.

Addressing disputes and objections

If a customer raises a dispute or objection, it's essential to address it promptly and professionally. Listen carefully to their concerns, investigate the validity of their claim, and seek a resolution. If the dispute is valid, you may need to issue a credit note or amend the invoice. If the dispute is unfounded, reiterate your contractual payment terms and the outstanding payment obligation, including interest. Effective dispute resolution can often salvage a customer relationship and secure payment, thereby avoiding the need for formal debt recovery.

Offering payment plans or partial payments

In cases where a customer is experiencing genuine financial difficulty, offering a structured payment plan or accepting partial payments can be a pragmatic solution. This demonstrates flexibility and a willingness to work with the customer, potentially leading to the full recovery of the debt over time, rather than facing complete non-payment. However, any such agreement should be clearly documented in writing, outlining the payment schedule and the continued accrual of interest on the outstanding balance. This can be a valuable tool within your credit and collections strategy.

When to escalate: formal debt recovery and legal action

If internal collection efforts and dispute resolution fail to secure payment, it's time to consider more formal avenues for recovery. This stage requires careful consideration of the debt amount, the customer's likely ability to pay, and the potential costs involved. The Late Payment of Commercial Debts Act 1998 and subsequent updates provide the framework for these more serious steps, including the possibility of legal action.

Engaging a debt recovery agency or collection agency

For significant overdue amounts, engaging a professional debt recovery agency can be an effective solution. These agencies specialise in debt collection and have established processes for recovering outstanding funds. They typically work on a commission basis, meaning they only get paid if they successfully recover the debt, making it a cost-effective option for many small businesses. They can also manage communication and legal processes, freeing up your internal resources and ensuring compliance with late payment law.

Formal legal action: Small Claims Court and money claims

If other methods fail, pursuing legal action may be necessary. For smaller debts, the Small Claims Court (or equivalent in Scotland and Northern Ireland) offers a relatively straightforward and cost-effective route to obtain a legally binding judgment. For larger sums, the Money Claims Online service facilitates the process. A court judgment orders the debtor to pay the amount owed. If they still fail to pay, further enforcement options can be taken to recover the debt. This demonstrates the full spectrum of recourse available under UK payment laws.

Statutory demand: a serious step towards insolvency

A statutory demand is a formal demand for payment of a debt, often a precursor to insolvency proceedings. Serving a statutory demand can be a powerful tool as it requires the debtor to pay the debt within a specific timeframe (usually 21 days) or face potential winding-up proceedings. This is a serious step and should generally be undertaken with legal advice, as incorrect procedures can invalidate the demand. It is typically reserved for undisputed debts where other debt recovery methods have been exhausted.

Stored: prevent late payments before they happen

All the strategies in this guide work better with the right tools. Stored is a unified payments platform that helps you prevent late payments in the first place — and get paid faster when they do happen.

How Stored helps:

• Digital invoicing: Send professional invoices instantly. Less time lost to delays in the post or unclear email trails.
• Pay by link: Include a payment link in every invoice. Customers click, pay, and it's done — no hunting for payment details or accounts payable contact info.
• Next-day settlement: Don't wait weeks. Your money lands the next business day, so cash flow stays healthy.
• Easy payment methods: Offer card payments, QR codes, and social payments. Multiple options mean fewer reasons for customers to delay.
• Integration with accounting: Sync with Xero, QuickBooks, and others. Automated reconciliation saves time and keeps records clean.

Stored is trusted by UK SMEs with a 4.8/5 Trustpilot rating and was recognised in the Startups 100 Index. Built by founders with 20+ years of payments experience from Fiserv and WorldFirst.

Combined with the debt recovery and interest strategies in this guide, Stored gives you a complete system to reduce late payments and manage your cash flow confidently.

Related articles

Explore more guides for UK small businesses:

• How to switch payment provider
• All-in-one payment platforms for UK small businesses
• Open banking payments for UK merchants
• Small business lending and short-term funding solutions
• Recurring payment solutions for steady cash flow

Conclusion

Late payments threaten growth. But you have legal rights, and you have tools. By understanding the Late Payment Act, implementing clear payment terms, sending timely invoices, and consistently applying interest, you can take control of your cash flow.

The best approach combines prevention and recovery. Use digital invoicing, pay by link, and automated reminders to prevent late payments. When they do happen, know your legal rights and use them.

Ready to take control? Start with Stored. Digital invoicing and pay by link help you get paid faster. Next-day settlement means your cash flow improves immediately.

Sign Up for free or Book a Demo to see how Stored helps you prevent and recover late payments faster.

See how much card processing fees are really costing you with our free calculator.