The verdict in three sentences
Manual dunning is the Achilles' heel of SME cash flow: it arrives too late, irregularly, and burdens already overloaded teams. In 2026, an automated multi-channel dunning system (email, SMS, letter, escalation) costs 6,000 to 20,000 EUR and typically cuts DSO by 10 to 20 days. The return on investment is almost always under 12 months for an SME billing more than 500,000 EUR a year.
Dunning scenarios and recovery rates
A good scenario combines consistency, a progressive tone and escalation. Here is a typical sequence and its estimated effect on collection (order of magnitude 2026).
| Step | Timing | Channel | Estimated effect |
|---|---|---|---|
| Polite reminder | D+3 after due date | +25% payments within 7 d | |
| Firm reminder | D+10 | email + SMS | +20% settlements |
| Formal notice | D+20 | email + letter | +15% clearances |
| Sales escalation | D+30 | call + internal alert | prioritised cases |
| Collection handoff | D+45 | structured file | limits losses |
Impact on DSO and cash flow
DSO (average days to pay) is the crux. Cutting it mechanically frees up cash. Estimate for an SME billing 1,200,000 EUR/year.
| Indicator | Before | After automation |
|---|---|---|
| Average DSO | 62 days | 45 days |
| Cash tied up | ~204,000 EUR | ~148,000 EUR |
| Cash freed | — | ~56,000 EUR |
| Dunning time/month | 22 h | 4 h |
| Project cost (EUR) | — | 6,000-20,000 |
Mini case study
Marc, CFO of a 30-person services SME in Toronto, bills 1.2 million EUR a year with a 62-day DSO. His two accountants spend 22 hours a month chasing payments, often late. He invests 11,000 EUR in an automated dunning engine integrated with his billing and accounting. In six months, DSO drops to 45 days, freeing about 56,000 EUR of cash. The time saving (18 hours/month saved, ~7,000 EUR/year) and improved collection pay back the project in under 9 months, while reducing team stress.
FAQ
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How much does dunning automation cost in 2026?
Between 6,000 and 20,000 EUR depending on the number of scenarios, channels and the level of integration with your billing and accounting.
How much can DSO be reduced?
A 10-to-20-day reduction is realistic in the first year, provided you chase early and consistently. The cash impact is proportional to your billing volume.
Does the system integrate with my billing software?
Yes. It connects to most billing and accounting solutions via API to trigger reminders automatically at due date.
Won't automated reminders alienate customers?
No, if the tone is progressive and personalised. Early reminders are polite; escalation only applies to confirmed delays, with an adapted tone.
What is the setup timeline?
Expect 4 to 8 weeks, scoping and connection to your tools included.
Let's scope your project. Share your current DSO and annual billing volume — we estimate recoverable cash and price the module. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
