Every unpaid invoice is a loan you are giving your customer — interest-free. The longer it sits, the more it costs you. Yet for most SMEs, late payments are treated as an unavoidable fact of business rather than a solvable problem. They are not. With the right processes in place, accounts receivable can become one of the most powerful levers for improving your cash position — without any new revenue.
Days Sales Outstanding (DSO) is the metric that captures your collections performance most precisely. It measures the average number of days it takes to collect payments on invoices sent to customers — and benchmarks for most businesses sit under 45 days, and under 30 days for smaller SMEs. If yours is significantly above that, you almost certainly have cash tied up in receivables that could be freed quickly.
Having managed accounts payable and receivable across multiple business units at Coca-Cola Europacific Partners — and having built the forecasting systems to track these metrics at scale — I have seen first-hand which interventions actually move DSO and which ones feel productive without delivering results. This article covers the ones that work.
"Revenue on paper is not cash in the bank. The gap between those two things is your accounts receivable problem."
What DSO Actually Tells You
The DSO formula is straightforward:
DSO = (Accounts Receivable ÷ Total Credit Sales) × Number of DaysIf your business has €120,000 in outstanding receivables and made €400,000 in credit sales over the last 90 days, your DSO is (120,000 ÷ 400,000) × 90 = 27 days. That is a healthy number. If the same receivables sit against only €200,000 in sales, your DSO rises to 54 days — and that means money is moving through your business much more slowly than it should be.
A rising DSO does not always mean customers are refusing to pay. It can signal gaps in your invoicing process, inconsistent follow-up, unclear payment terms, or disputes that are not getting resolved. Understanding which of these is driving your DSO is the first step to fixing it.
Start With Your Ageing Report
Before changing any process, get clear on your current position. Pull your accounts receivable ageing report — a breakdown of all outstanding invoices sorted by how overdue they are: current, 1–30 days overdue, 31–60 days, 61–90 days, and over 90 days.
This single report tells you everything you need to know to prioritise your effort. The total value in each overdue bucket shows you where your cash is sitting. The customers appearing in the 60+ day column need immediate attention — every day that passes reduces the probability of collection and increases the likelihood of a bad debt write-off.
Make the ageing report a weekly ritual. If you are only looking at it monthly, you are reacting to problems instead of preventing them. The discipline of a weekly review — even a 15-minute scan — ensures that no invoice drifts into the 60-day overdue column without someone noticing and acting.
Invoice the Moment Work Is Delivered
This is the simplest and most consistently underused intervention in accounts receivable management. Manual invoicing is a major bottleneck; it causes delays because invoices are sent late, reminders are missed, and the payment process is often cumbersome for customers.
Every day between completing a job and raising the invoice is a day of DSO you have added yourself — before the customer has even seen the bill. In many SMEs, invoicing happens at the end of the week, or at month-end, out of habit. Switching to same-day or next-day invoicing is free, requires no systems change, and can reduce your DSO by 5–10 days immediately.
Make invoices easy to pay
A well-designed invoice reduces friction and speeds up payment. It should state the amount clearly, show the due date prominently, specify accepted payment methods, and — ideally — include a payment link or bank details that require no effort on the customer's side. The easier you make it to pay, the faster customers pay.
Check your invoice for errors before sending
Billing errors are a silent killer of cash flow. Every incorrect invoice triggers a dispute, a delay, and often a damaged customer relationship. A quick accuracy check before sending — correct amount, correct customer name, correct payment terms, correct bank details — prevents delays that can add weeks to your DSO.
Build a Structured Follow-Up Process
Most overdue invoices are not the result of customers refusing to pay. They are the result of invoices being forgotten — by the customer, or by you. A structured follow-up sequence changes this entirely.
Here is a proven cadence that balances professionalism with persistence:
7 days before due date
Send a friendly reminder — "Just confirming our invoice of €X is due on [date]. Please let us know if you have any questions." This catches any issues before the due date rather than after.
On the due date
If payment has not arrived, send a brief confirmation — "Your invoice of €X was due today. If you have already paid, please disregard. If not, we would appreciate settlement today."
7 days overdue
A firm but professional email noting the invoice is now overdue and requesting payment within 48 hours. If you have a phone number for the contact, this is the right moment to call — a conversation is always faster than an email thread.
14 days overdue
Escalate — contact a more senior person at the customer, or note that you will be adding late payment interest per your invoice terms.
30+ days overdue
At this point, consider pausing further work or deliveries to the customer until the outstanding balance is settled. A customer who will not pay for past work should not receive future work on credit.
Use automated reminders 7, 14, and 21 days after issuing the invoice. This keeps collections active and reduces manual tracking, without adding overhead. Many accounting tools allow this to be set up once and run automatically.
Review and Tighten Your Payment Terms
Payment terms are often set once — at the beginning of a business relationship — and never revisited. This is a mistake. As your business grows and your customer relationships mature, your terms should be actively managed rather than passively inherited.
Shorten your standard terms
If you currently offer 60-day payment terms as standard, the question worth asking is: why? In many cases, long terms are offered to win business — but once a customer is established and paying reliably, there is no reason they cannot move to 30 days. Have the conversation. Many customers will simply agree.
Segment your customers by risk
Not all customers deserve the same terms. A customer with a five-year track record of reliable payment is different from a new customer with an unknown payment history. Offering new customers shorter terms — or requiring a deposit or advance payment — is standard practice and should be normalised in your business. Set credit limits upfront: don't let customers decide how much risk you carry.
Use early payment incentives selectively
A 1–2% discount for payment within 10 days (known as "2/10 net 30") can accelerate collections significantly from cash-rich customers who are simply slow to act. The cost of the discount is almost always less than the benefit of having the cash 20 days earlier — and it rewards the right customer behaviour.
Make DSO a Tracked KPI — Not a Lagging Indicator
Most businesses calculate DSO once a quarter, at best, during a financial review. By then, the problem is already embedded. The businesses that consistently maintain a low DSO treat it as a live operational metric — something that is looked at weekly, owned by a named individual, and discussed in regular team meetings.
The practical mechanics of this are simple. Calculate DSO at the end of every month. Put it on a dashboard alongside your ageing report. Set a target — for most SMEs, 30–45 days is achievable — and track your progress against it. When DSO rises, investigate immediately: is it one large overdue customer, a new customer segment, a change in your invoicing process, or a broader collections issue?
If you have Power BI set up, a live DSO dashboard that pulls directly from your accounting data is a 30-minute build — and it means you never have to manually calculate it again. The metric updates automatically, and any deterioration is visible the moment it happens rather than weeks later.
Connecting DSO visibility to your collections actions is where the real improvement compounds. When your team can see which customers are driving the number up, they know where to focus. When management can see the trend improving over time, they know the process is working.
What a 10-Day DSO Reduction Is Worth
The financial impact of reducing DSO is direct and immediate. The formula is simple: (Annual Revenue ÷ 365) × Days Reduced = Cash Released.
This is real cash — not a paper adjustment — that flows directly into your bank account as collections improve. It requires no new customers, no new products, and no external financing. It comes entirely from getting paid faster for work you have already done.
Key Takeaways
- DSO measures how many days it takes to collect payment after a sale — most SMEs should target under 45 days
- Start with your weekly ageing report — it tells you exactly where your cash is sitting and who to chase first
- Invoice the same day work is delivered — every day of delay is a day of DSO you have added yourself
- Build a structured follow-up sequence: reminders before due, on due date, 7 days after, 14 days after, 30 days after
- Review your payment terms actively — not all customers deserve the same terms, and many will accept shorter ones if you ask
- Track DSO monthly, own it, and connect it to visible actions — what gets measured gets managed
- A 10-day DSO improvement at €2M revenue releases approximately €55K in cash immediately
Where to Start
If you have never pulled an accounts receivable ageing report, do it today. It takes five minutes in any accounting software and will immediately show you how much cash is sitting in overdue invoices — and which customers are responsible. That is all the information you need to take action.
If your ageing report is already part of your routine but your DSO is not improving, the issue is almost always in the follow-up process — either it is inconsistent, too passive, or not happening at all for invoices in the 30–60 day bucket. That is where a structured collections cadence makes the most immediate difference.
If you would like a review of your current accounts receivable process — including calculating your DSO, benchmarking it against your industry, and identifying the specific steps that would reduce it most quickly — book a free initial consultation. One conversation is usually enough to identify the biggest opportunity and a clear plan to act on it.
What is your current DSO?
Book a free 30-minute consultation. We will calculate it together and identify what is holding it up.
Book a Free ConsultationIvaylo has over 10 years of senior FP&A experience at Coca-Cola Europacific Partners, including managing accounts payable and receivable across multiple European business units. He founded Avi Finance to bring that expertise directly to SMEs across Europe.