Improving DSO in Practice – Shorten Your Accounts Receivable Turnover

DSO, or Days Sales Outstanding, is one of the most important cash flow metrics – yet surprisingly few SME entrepreneurs monitor it actively. According to the Federation of Finnish Enterprises, 72% of SMEs find late payments problematic, but only a small fraction measures DSO systematically. In this guide we cover how to calculate DSO, what to benchmark it against, and how to improve it in practice.

What Is DSO and How Is It Calculated?

DSO (Days Sales Outstanding) measures how many days on average it takes before clients' invoices turn into cash in the bank. It is a simple but powerful indicator of how effectively accounts receivable are managed.

Basic formula: DSO = (accounts receivable / revenue) x period days. For example: at the end of the month, accounts receivable are EUR 120,000 and monthly revenue is EUR 150,000. DSO = (120,000 / 150,000) x 30 = 24 days. This means invoices are paid on average after 24 days.

Pitfalls in DSO Calculation

There are a few common errors in DSO calculation that distort the result. First, the choice of period matters significantly: monthly DSO fluctuates more than quarterly. Second, VAT must be considered: receivables typically include VAT, but revenue does not. Third, seasonality is not captured if calculation is based on only one month.

In my own company, I calculate DSO on a quarterly basis because monthly variation is too large for reliable conclusions. Quarterly DSO smooths out monthly fluctuation and provides a better picture of the actual trend.

DSO Benchmarks in Finland

Based on Statistics Finland's financial statements data, the average DSO for Finnish SMEs is approximately 39 days. However, this varies significantly by industry.

Practical Ways to Improve DSO

1. Fast and Error-Free Invoicing

Invoicing speed is the fundamental prerequisite for improving DSO. Every day of invoicing delay extends DSO by one day. Automate invoicing as far as possible. Also ensure invoices are error-free – an incorrect invoice causes disputes and delays. Include the correct reference number, correct details, and a clear breakdown of work performed.

2. Clear Payment Terms and Adherence

Unclear payment terms lead to late payments. Ensure the payment condition is clearly visible on every invoice, offer, and contract. Favour e-invoicing, which speeds up invoice processing on the client's side. Stick to agreed terms – if you grant extra time once, it easily becomes standard practice.

3. Proactive Payment Reminders

The best collection is that which happens before the due date. By sending a friendly reminder 2–3 days before the due date, you ensure the invoice is being processed by the client. This is not pushy – it is professional business practice. Many financial management software solutions support automatic reminders.

4. Client Segmentation and Risk Management

Not all clients are equal payers. Segment your clients by payment history: A-clients always pay on time, B-clients need a reminder, and C-clients are chronic late payers. Focus resources on C-clients and consider whether it is worthwhile to offer them payment terms at all.

5. Invoice Financing as a DSO Improver

When clients' payment terms cannot be shortened, invoice financing offers an immediate solution. By selling an invoice to a finance company, you receive the funds within 24 hours, which effectively shortens DSO to 1–2 days for that invoice. This is especially useful for large invoices where a long payment term ties up significant capital.

In my own company, I use invoice financing selectively: large invoices with payment terms over 30 days go to financing, while smaller invoices wait for normal payment. This optimises costs while keeping DSO under control.

The Impact of Improving DSO on Cash Flow – An Example

Let us look at a concrete example. A company has EUR 1,200,000 in annual invoicing and a current DSO of 48 days. Capital tied in receivables: 1,200,000 x 48 / 365 = approximately EUR 157,800. If DSO shortens to 35 days, receivables become: 1,200,000 x 35 / 365 = approximately EUR 115,100. Difference: EUR 42,700 freed for working capital.

Automatic DSO Monitoring

Manually calculating DSO is laborious and easily neglected. Modern financial management software calculates DSO automatically. Procountor, Netvisor, and Finago all offer real-time DSO monitoring. If you use Excel, build a simple formula that updates DSO monthly.

Set an alert threshold: if DSO rises above an agreed level (for example above the industry average), you receive a notification. This way you can react quickly before the situation escalates.

Summary

DSO is a critical cash flow metric whose systematic monitoring and improvement frees working capital and improves a company's liquidity. In Finland, the average DSO for SMEs is approximately 39 days, but many companies have significant improvement potential. The methods are practical: prompt invoicing, automatic reminders, client segmentation, and invoice financing when needed.