Statutory Interest: What UK Businesses Need to Know About Late Payment Rules

If you’ve ever felt frustrated by customers who pay late-or worried about cash flow because invoices aren’t settled on time-you’re not alone. For UK small business owners, late payments can be one of the biggest headaches, leading to stress, uncertainty, and even risking the survival of your venture. Fortunately, there’s a powerful tool at your disposal that many businesses overlook: statutory interest.

Understanding your rights to charge statutory interest on overdue payments isn’t just about collecting what you’re owed; it can also deter slow payers and give you control over your receivables. Not sure how statutory interest works, who can use it, or what the rules are? Don’t stress-getting up to speed is easier than you might think. In this guide, we’ll break down everything you need to know so you can confidently protect your business cash flow and stay compliant.

Keep reading for a clear run-through of how statutory interest applies to late payments in the UK, who qualifies, the rates, how to charge it, and best practices to set yourself up for smooth payment cycles from day one.

What Is Statutory Interest?

Let’s start with the basics-what exactly is statutory interest? In short, statutory interest is a legal right granted to most UK businesses to charge interest on overdue payments from commercial customers. This right is based on the Late Payment of Commercial Debts (Interest) Act 1998.

Statutory interest is designed to encourage prompt payment, compensate businesses for the inconvenience of waiting for their money, and discourage late payers. It works by setting a fixed rate of interest that you can add to overdue invoices, plus sometimes a recovery fee for your trouble.

Here’s how it works in practice:

• You supply goods or services to another business (not a consumer).
• Your payment terms are set-in a contract or, if not, by law.
• If the invoice isn’t paid on time, you may charge interest at the statutory rate until it’s paid in full.

This gives small business owners more power to push for timely payment-and get compensated if customers drag their feet.

When Can You Charge Statutory Interest?

You can usually charge statutory interest on late payments when:

• You sold goods or provided services under a business-to-business (B2B) contract.
• The contract does not already state a different interest rate or doesn’t specifically exclude statutory interest.
• Your customer is another business or public authority (not a private consumer).

If your contract sets a different interest rate for late payment, you must use that rate. But if the contract is silent, or says “statutory interest applies,” you’re entitled to charge the statutory rate.

Not sure whether your contract covers this? This is why having rock-solid, tailored business contracts in place is so important. These provisions don’t just protect your payment rights-they also make disputes easier to resolve.

What Is the Current Statutory Interest Rate?

The statutory interest rate is set by law at 8% above the Bank of England base rate (which may change, so always check the latest base rate). For example, if the base rate is 5.25%, statutory interest would be 13.25% per year. This rate is deliberately high to encourage prompt payment and compensate for your lost use of the money.

The rate is simple interest-it does not compound. You calculate it as a percentage of the overdue amount for the number of days payment is late.

How Do You Calculate Statutory Interest on an Overdue Invoice?

Calculating statutory interest is straightforward. Here’s a simple step-by-step:

1. Find the overdue amount (e.g., £5,000).
2. Check the statutory interest rate (e.g., 13.25%).
3. Work out the daily interest:
   £5,000 x 13.25% / 365 = £1.81 (rounded to 2 decimal places).
4. Multiply by the number of days the invoice is overdue (e.g., 60 days):
   £1.81 x 60 = £108.60.

Add this interest to the amount your customer already owes. You’re within your rights to demand it at any point the debt is unpaid past your payment term.

Can You Charge A Late Payment Recovery Fee Too?

Yes. In addition to interest, the law lets you claim a fixed sum for the cost of recovering a late payment:

• £40 for debts under £1,000
• £70 for debts of £1,000 - £9,999.99
• £100 for debts of £10,000 or more

If your actual costs are higher, you might be able to claim reasonable extra recovery costs-especially if you need to hire a debt collector or legal expert.

Which Businesses Qualify for Statutory Interest?

Not every overdue invoice is covered. Statutory interest applies when:

• You are supplying goods or services to another business or public sector body.
• Your terms are silent, or refer to statutory interest (or say nothing at all about late payment interest).
• The customer is in the UK.

It does not apply when:

• Your customer is a private individual or consumer (not a business).
• Your contract specifically states another interest rate or excludes statutory interest.
• You are dealing with certain financial contracts, insurance, or certain regulated agreements (these have their own rules).

Need help making sure you’re covered? Consider getting your contract reviewed or drafted by a legal expert who understands your business type.

How Do You Add Statutory Interest to an Invoice?

If payment is late and you wish to apply statutory interest, it’s best to:

1. Send a polite reminder first-sometimes customers genuinely forget.
2. If still unpaid, send a statement setting out:
   • The original invoice amount and due date
   • The number of days overdue
   • The calculated interest (using the current statutory rate)
   • Any late payment recovery fee you’re claiming
   • A new total amount owed
3. State clearly that you are charging statutory interest under the Late Payment of Commercial Debts (Interest) Act 1998.

This approach keeps things professional and shows you understand your rights. For tips on getting invoices paid quickly, check out our guide to clear invoice terms.

What If the Customer Refuses to Pay Interest?

Sometimes a customer might balk at paying statutory interest, or try to negotiate it down. It’s up to you whether to insist or compromise, but remember: this is your right under UK law. If they refuse to pay despite reminders and clear evidence, you could pursue legal action or even a statutory demand for payment.

However, it’s good practice to try and resolve the dispute amicably first. Sometimes just reminding a customer of your right to claim statutory interest is enough to prompt swift payment.

Best Practices to Avoid Late Payment Problems

While statutory interest is a useful tool, ideally you want to avoid late payments in the first place. Here are a few habits that can help:

• Set out clear payment terms in writing (ideally in professionally drafted contracts).
• Issue invoices promptly and double-check they include due dates and payment details.
• Send polite reminders as the due date approaches, then escalate if needed.
• Have a policy for charging interest and include it in your business terms and conditions.
• Consider using invoice factoring or direct debit to improve cash flow.

Remember: a well-drafted agreement and clear processes make it easier to enforce your rights if you ever need to. If you need help updating your contracts or want to put better payment terms in place, our team can help you get the right documents sorted out for your business.

Are There Any Legal Limits or Pitfalls to Watch Out For?

Yes-there are some important limits to be aware of:

• You can’t apply statutory interest if your contract already sets a (reasonable) late payment rate.
• If your contract sets an unreasonably low interest rate “in bad faith” to avoid statutory interest, the law might allow you to use the statutory rate anyway. Fairness matters here.
• You can’t use statutory interest for debts owed by private consumers or certain types of regulated contracts.
• Charging statutory interest doesn’t usually affect VAT-interest is not subject to VAT in most cases (but seek advice if unsure).

Perhaps the biggest pitfall for small business owners is NOT including strong late payment terms in your initial contracts, or copying and pasting generic templates. Each sector has its quirks, so make sure your legal documents align with how you sell and get paid.

Can I Use Statutory Interest When Chasing International Debts?

The short answer: it depends. Statutory interest rules apply to UK-based commercial debts-if your customer is located outside the UK, different laws might apply. However, many businesses add late payment clauses to their international contracts as a deterrent. If you trade overseas, consider including contract terms tailored for international law.

What Should I Do If I Struggle with Persistent Late Payments?

Ongoing payment problems can put your business at risk. If this is happening regularly:

• Review your contracts and consider updating your payment terms, interest clause, and enforcement plan.
• Talk to a legal expert about debt collection or formal recovery options-sometimes a legal letter is all it takes to get things moving.
• Consider running credit checks, requesting deposits, or rethinking your client onboarding process.

Don’t leave cash flow to chance. A few small legal fixes now can give you far more leverage next time.

Key Takeaways: Statutory Interest for UK Businesses

• Statutory interest lets UK businesses charge interest (and sometimes recovery fees) on overdue B2B invoices-helping protect cash flow and deter late payment.
• The standard rate is 8% above the Bank of England base rate and applies if your contract is silent on a specific late payment interest rate.
• To use statutory interest, your customer must be another business (not a consumer), and your contract must not exclude it or set a different late payment interest rate.
• Always communicate clearly and professionally with late payers-set out how the interest is calculated and cite your legal right under the Late Payment of Commercial Debts (Interest) Act 1998.
• Well-drafted contracts, clear payment terms and regular reminders are your best defences against late payment headaches from day one.
• If late payments are persistent, consider reviewing your contracts and legal processes, or get professional advice about your recovery options.

---

If you need help setting up your payment terms, want to review your contracts, or just want to know where you stand when it comes to statutory interest or late payment recovery-get in touch with us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligation chat. We’re always happy to help UK business owners protect your legal foundations from day one.