Debtor Days Rising? How to Get Your Customers Paying Faster
Many business owners face a familiar frustration. Sales are healthy, the order book looks good, and the business is profitable. Yet there never seems to be quite enough money in the bank.
Meanwhile, customers who should have paid weeks ago are still sitting on outstanding invoices. Someone needs to chase them, but there are more pressing things to do. So another week passes.
At BookCheck, we understand how difficult this can be. We work with businesses that need better control of their financial information, and one of the areas that deserves particular attention is how quickly customers are paying.
The problem often develops gradually. A few late payments become a growing list of outstanding invoices. The Managing Director starts getting involved in chasing customers. Eventually, cash flow becomes a daily concern. The good news is that improving debtor management doesn't necessarily require a major change to the business. Often, it starts with better bookkeeping, reliable information and a more disciplined approach to collecting money.
How serious is the late payment problem for UK businesses?
UK small businesses waited an average of 29.5 days to be paid during July to September 2026, with payments arriving an average of eight days late. Those are the latest figures from Xero Small Business Insights, published on 29 October 2026.
Both measures deteriorated slightly compared with the previous quarter, when the average time to be paid was 28.8 days and late payments averaged 7.6 days. The figures are not dramatically worse than historical levels, but they illustrate a continuing problem for businesses trying to manage their cash.
Xero also reported that UK small business sales growth slowed to 4% year-on-year in the September quarter, compared with 5.6% in the previous quarter. When sales growth is slowing, waiting longer for customers to pay can be particularly uncomfortable.
Of course, national averages only tell part of the story. A business with customers paying on 60-day terms will have very different cash requirements from one expecting payment within 14 days. What matters is whether your own payment performance is improving or deteriorating, and whether you have sufficient cash to meet your commitments.
What are debtor days and why should you monitor them?
Debtor days measure how long, on average, a business takes to collect payment from customers. Rising debtor days mean more cash is tied up in unpaid invoices.
A commonly used calculation is:
Debtor days = Trade debtors ÷ Credit sales × Number of days in the period
The figures must be calculated on a consistent basis, with VAT treated appropriately.
Suppose your business has annual credit sales of £1.2 million and average debtor days of 45.
That represents approximately £148,000 tied up in trade debtors, assuming an even sales pattern and excluding VAT.
Reduce debtor days to 35 means the equivalent figure falls to approximately £115,000.
That's around £33,000 less tied up in unpaid invoices.
It doesn't mean you've made an additional £33,000 profit. You've simply collected money that was already owed to you sooner. But that money could make a substantial difference to your ability to pay suppliers, meet payroll or invest in the business without relying so heavily on an overdraft.
We believe debtor days should be a regular part of management reporting, alongside profitability, margins and cash flow. If you only look at your outstanding debtors when the bank balance becomes uncomfortable, you're probably looking at the problem too late.
Why do businesses end up with so many unpaid invoices?
Outstanding debts often build up because nobody has clear responsibility for monitoring payment dates and following up on overdue invoices.
There are several situations worth watching for.
Invoices are raised too late. Work is completed, but the invoice isn't sent until the end of the month. The customer may then have another 30 days to pay. You've effectively extended their credit before the payment period has even started.
Nobody follows up promptly. A customer misses a payment date, but the invoice isn't chased for another fortnight. By then, it may have missed the customer's next payment run.
The sales ledger isn't accurate. Payments haven't been allocated correctly, credit notes are outstanding or disputed invoices remain unresolved. It becomes difficult to know exactly what is owed.
The business is reluctant to chase important customers. This is understandable, particularly when a customer represents a significant proportion of turnover. But consistently accepting late payment can create a problem that becomes increasingly difficult to resolve.
The owner is doing too much personally. Chasing unpaid invoices is squeezed between managing staff, winning new business and dealing with customers.
We often find that the underlying issue is the need for more reliable financial information and clearer processes. A business may have an accounting system, but that doesn't automatically mean its debtor information is sufficiently accurate or up to date to support effective decisions.
How can you reduce debtor days and get invoices paid faster?
The most effective way to reduce debtor days is to make invoicing, payment monitoring and follow-up a regular process rather than something you do when cash becomes tight.
Start by reviewing how your business currently handles customer payments.
1. Invoice as soon as you can
Make sure invoices are issued promptly and contain everything the customer needs to process payment. That might include a purchase order number, the correct billing contact or evidence that the work has been completed.
A missing reference can hold up payment unnecessarily.
2. Review your aged debtors regularly
An aged debtor’s report shows outstanding invoices grouped according to how long they have been unpaid. It should help you identify which invoices are approaching their due date, which are overdue and which customers are becoming persistent late payers. The report is only useful if the underlying records are accurate and somebody acts on the information.
3. Follow up consistently
Customers should know that overdue invoices will be followed up. A polite reminder shortly before payment is due can be helpful. Once the due date passes, follow-up should be prompt and consistent. If a customer promises to pay on Friday, make sure somebody checks whether the money arrives.
That sounds simple, but it is remarkably easy for these commitments to be forgotten when everyone is busy.
4. Deal with disputes immediately
Sometimes an unpaid invoice is the result of a genuine query. Perhaps the customer is unhappy with part of the work or needs additional documentation. These issues should be resolved quickly. Leaving them unanswered can delay payment for weeks.
5. Review your payment terms
If customers routinely take longer to pay than agreed, consider whether your existing terms are appropriate. For some businesses, deposits, staged payments or shorter credit periods may be sensible.
It is also worth reviewing the credit exposure you have with individual customers, particularly where one customer accounts for a substantial amount of outstanding debt.
Can you charge interest on late-paying customers?
UK businesses can generally claim statutory interest and recovery costs on qualifying overdue commercial invoices, subject to the contractual terms and applicable legislation. Under the current rules, statutory interest is normally calculated at 8% above the Bank of England base rate, although a different contractual interest provision may apply.
Businesses may also be entitled to fixed debt recovery costs of £40, £70 or £100, depending on the size of the debt. The GOV.UK guidance on late commercial payments explains the rules.
Charging interest isn't always the right commercial decision. You may prefer to preserve a valuable customer relationship. Nevertheless, knowing your rights is important, particularly where late payment has become habitual.
How can outsourced bookkeeping help improve cash flow?
Outsourced bookkeeping can improve cash flow management by keeping financial records accurate and current, making overdue debts easier to identify and giving business owners the information they need to take action.
At BookCheck, we provide bookkeeping together with management accounts. We believe the two should work together. There is limited value in having beautifully presented management accounts if the underlying bookkeeping isn't accurate. Equally, keeping the books up to date is only part of the job if the business owner doesn't receive useful information from them.
Our approach is to provide both.
We assign a dedicated bookkeeper to each client. The accounts are reconciled and then thoroughly checked by a qualified BookCheck accountant before the management accounts are issued. We work principally with Xero, although we also support Sage.
This means business owners can receive reliable financial information without having to manage the day-to-day bookkeeping themselves. For a business struggling with outstanding debtors, the benefits can be considerable.
You can see how much is owed, identify payment trends and understand the effect that outstanding invoices are having on cash flow. Our management reporting can be tailored to the business, so debtor days and other relevant cash flow measures can be monitored alongside profitability.
Importantly, we work with clients to establish which bookkeeping tasks we will handle and which remain with their own team. Responsibility for sales ledger management and customer credit control can therefore be clearly agreed, rather than assuming every activity is included automatically.
You can read more about our bookkeeping and management accounts service here.
Why is good management information important when cash is tight?
Good management information helps you distinguish between a temporary cash shortage and a developing problem with customer payments, profitability or working capital. A business can be profitable on paper and still struggle to pay its bills. This is particularly common when turnover is growing.
More sales may mean purchasing additional stock, employing more people or paying suppliers well before customers settle their invoices. Without a clear view of cash flow, growth can become surprisingly difficult to finance.
We believe management accounts should help you answer practical questions:
Are debtor days increasing?
Which customers owe the most money?
How much of the outstanding debt is overdue?
Are we generating sufficient cash to meet our commitments?
What will our cash position look like over the coming weeks and months?
At BookCheck, we can tailor management reporting to the information that matters most to your business. Our BookCheck Advanced Reporting (BAR) service also provides customised financial reporting using data from Xero or Sage. The objective is straightforward: give you accurate information while there is still time to do something about it.
When should you consider outsourcing your bookkeeping?
If you are regularly chasing invoices yourself, struggling to trust your debtor reports or receiving financial information too late to act, it may be time to consider outsourcing. For many Managing Directors, the decision comes after months of trying to manage the problem internally.
Perhaps the bookkeeper only works a few days each week. Perhaps the business has outgrown its existing accounting arrangements. Or perhaps the owner has gradually taken responsibility for financial administration that should be handled elsewhere.
Whatever the circumstances, the cost isn't limited to the bookkeeping itself. There is also the management time involved, the frustration of unreliable information and the risk of making decisions without understanding the cash position. Outsourcing can remove much of that burden.
At BookCheck, we have spent more than 30 years providing bookkeeping with management accounts for businesses that want a reliable service and better financial control. We understand that business owners don't want to spend their time checking reconciliations or trying to work out whether the debtors report is correct. They want to know how the business is performing, where the problems are and what action needs to be taken.
That's what good bookkeeping and management accounts should help them achieve.
Frequently asked questions about debtor days and late payments
What is a good debtor days figure for a UK business?
There is no single ideal figure. It depends on your industry, agreed payment terms and customer mix. A business offering 14-day terms should generally expect a different result from one operating on 60-day terms. The important measures are whether customers are paying as agreed and whether debtor days are increasing.
Can a profitable business fail because customers don't pay on time?
Absolutely yes. Profitability and cash flow are two different things. A business can record profitable sales but run short of cash if customers take too long to pay. It still needs money available to meet wages, supplier payments, VAT and other commitments.
Will using Xero automatically reduce late payments?
No. Xero can provide useful invoicing, debtor reporting and payment reminder functions, but the information must be accurate and somebody must take responsibility for acting on it. Software supports good financial management; it doesn't replace it.
Can an outsourced bookkeeper chase unpaid invoices?
Some outsourced bookkeeping arrangements include credit control, but the scope varies between providers. BookCheck's core service is bookkeeping with management accounts. We agree the division of responsibilities with each client, including sales ledger and receipts-related tasks, so you know exactly what support is being provided.
How quickly can better bookkeeping improve cash flow?
Accurate and up-to-date records can help identify overdue debts and payment problems relatively quickly. How soon cash is collected depends on the age of the debts, customer circumstances, disputes and the effectiveness of follow-up. Better bookkeeping provides the information needed to start improving the position.
Take control of your debtors before they take control of your business
If you are spending too much time chasing unpaid invoices, it is worth looking at the way your bookkeeping and financial reporting are organised. You may already have the sales and the profitability to run a successful business. What you need is better control over the money coming in.
At BookCheck, we provide outsourced bookkeeping with management accounts, giving business owners reliable financial information and removing much of the hassle of managing the books. If rising debtor days and late-paying customers are putting pressure on your cash flow, we'd be pleased to discuss how we could help.
Contact BookCheck or call 0800 883 0711 to discuss your bookkeeping and management accounts requirements.
