For many businesses, late payment is seen as an inconvenience. However, there is another way to view the issue.
When a customer takes 60 or 90 days to pay an invoice that was due in 30 days, they are effectively receiving finance from your business.
Strong debtor days management is essential because profitability and cash flow are not the same thing.
A business can report healthy profits while still struggling to meet payroll, supplier costs or investment commitments if customers are slow to pay.
At The MGroup, we regularly help businesses across Oxfordshire, and beyond to improve cash flow visibility and strengthen working capital.
Debtor performance is one of the most important indicators of financial health, yet it is often overlooked until cash becomes tight.
“Taking action early often creates more opportunities and reduces risks. Regular monitoring of debtor days helps businesses stay in control rather than reacting when problems arise.” says Wendy Tatham, Partner at The MGroup
Why Debtor Days Management Matters
Recent Government data provides some positive news. Large businesses paid approximately 15% of invoices late during 2025, compared with around 25% in 2018. Average payment times also reduced from 35 days to 32 days over the same period.
However, even a small number of overdue invoices can create significant pressure on cash flow.
For example:
- Payroll still needs to be paid on time.
- Suppliers expect prompt settlement.
- Tax liabilities do not wait for customers to pay.
- Growth opportunities may be missed through lack of working capital.
As a result, businesses should move beyond simply reviewing total debtors and start measuring performance.
Useful internal KPI monitoring can include:
- Average debtor days.
- Value of overdue invoices.
- Percentage of invoices paid on time.
- Customers with recurring late-payment patterns.
- Trends over the previous 6 to 12 months.
By tracking these figures consistently, businesses can identify risks earlier and improve forecasting accuracy.
Looking Beyond the Outstanding Balance
Many management teams focus on how much money is owed overall. Equally important is understanding how long invoices remain unpaid.
Your accounting records should help answer several key questions:
- Which customers regularly pay late?
- How much cash is tied up in overdue debt?
- How many days does it normally take customers to settle invoices?
- Is payment performance improving or deteriorating?
These insights allow businesses to make more informed commercial decisions.
For example, a customer with a history of late payments may require:
- A reduced credit limit.
- Upfront deposits.
- Staged payment arrangements.
- More frequent payment reviews.
Meanwhile, customers with strong payment records may justify greater flexibility.
The objective is not simply debt collection. It is creating a payment culture that supports sustainable cash flow.
“The businesses that manage cash most effectively are often the ones that monitor customer payment behaviour as closely as sales performance.” says Wendy Tatham, partner at The MGroup
Practical Steps to Improve Debtor Days Management
There are several straightforward actions businesses can take to reduce late payments.
1. Invoice Promptly
Delays often start with delayed invoicing. Ensure invoices are issued as soon as goods or services are delivered.
2. Make Payment Terms Clear
Invoices should clearly state:
- Payment due date.
- Accepted payment methods.
- Late-payment policy.
- Contact details for payment queries.
3. Monitor Credit Limits
Customers approaching agreed credit limits should be reviewed before further work is undertaken.
4. Follow Up Early
A friendly reminder before the due date often prevents invoices slipping into the overdue category.
5. Review Debtor Performance Regularly
Include debtor reporting within monthly management meetings rather than only reviewing it during cash-flow difficulties.
Understanding Your Legal Rights
In addition to commercial measures, businesses may have statutory protection against late payment.
According to GOV.UK, where a payment date has not been specifically agreed, a commercial payment will generally become late 30 days after the customer receives the invoice or after goods or services are supplied, whichever occurs later.
Businesses may also be entitled, in qualifying circumstances, to claim:
- Statutory interest.
- Fixed debt recovery costs.
- Compensation for late commercial payments.
Government reforms are also expected to strengthen the late-payment regime further, with proposals that include maximum payment terms and enhanced powers for the Small Business Commissioner.
External resource:
- GOV.UK Late Payment Guidance: https://www.gov.uk/late-commercial-payments-interest-debt-recovery
What Should You Do Now?
✅ Review customer payment trends
✅ Measure and monitor debtor days monthly
✅ Identify recurring late-paying customers
✅ Check credit limits and payment terms
✅ Improve invoicing and collection processes
✅ Consider professional advice where issues persist
Key Takeaways
- Late-paying customers can effectively create an interest-free borrowing facility from your business.
- Strong debtor days management improves cash flow and financial resilience.
- Monitoring payment behaviour is often more valuable than simply reviewing outstanding balances.
- Early action can reduce risk and improve collection outcomes.
How We Can Help
At The MGroup, we help businesses strengthen financial controls, improve cash flow forecasting and develop practical strategies to reduce late-payment risk.
Whether you are reviewing working capital, assessing debtor performance or planning for growth, our team can provide trusted, expert and supportive advice.