The verdict in three sentences
At 75 days DSO, an SME invoicing 1.2 billion FCFA a year carries about 246 million FCFA in receivables. Dunning automation (email, SMS, WhatsApp Business) with a Wave, Orange Money or card payment link on the invoice targets 15 to 25 fewer days of DSO, freeing 50 to 80 million FCFA of cash. The project costs 1,500,000 to 4,000,000 FCFA (about 2,290 to 6,100 EUR) depending on integrations and often pays back in under 6 months.
Why invoices are paid late in Dakar
The causes are rarely bad faith. In B2B services SMEs (maintenance, security, cleaning, consulting, transport), you typically find:
- invoices sent 5 to 15 days after the service;
- an invoice that never reaches the right person (accounts payable, not the requester);
- manual reminders, sent when the assistant has time;
- no simple way to pay: bank transfer only, a cheque to collect;
- unresolved disputes (missing purchase order, missing acceptance report).
| Lever | Estimated DSO impact | Indicative 2026 cost |
|---|---|---|
| Automatic invoicing on service day | -5 to -10 days | Included in the tool |
| Preventive reminder 3 days before due date | -3 to -6 days | Email free, SMS 15 to 25 FCFA |
| Multichannel reminders at D+1, D+7, D+15 | -5 to -10 days | WhatsApp Business: a few FCFA to a few tens of FCFA per message |
| Wave, Orange Money or card payment link on the invoice | -3 to -8 days | Fees 1 to 3% depending on method |
| Aged balance dashboard | Steering | Included |
| Escalation to the sales rep beyond D+30 | -2 to -5 days | Included |
The effects do not fully add up: a 15 to 25 day reduction within 6 months is realistic.
What a custom automation includes
| Component | Description | Indicative budget (2026 estimate) |
|---|---|---|
| Connection to invoicing software (Sage, Odoo, Excel, in-house tool) | Reading invoices and receipts | 400,000 to 1,200,000 FCFA |
| Dunning scenario engine | Rules by customer segment, schedule, tone | 400,000 to 900,000 FCFA |
| Email, SMS, WhatsApp Business channels | Approved templates, send log | 300,000 to 700,000 FCFA |
| Payment link and reconciliation | Wave, Orange Money, card, automatic matching | 300,000 to 800,000 FCFA |
| CFO dashboard | Aged balance, DSO, payment promises | 100,000 to 400,000 FCFA |
| Total | 1,500,000 to 4,000,000 FCFA |
For reference, Kolonell's grid of 11/10/2026 for a simple custom application is 2,500,000 to 4,000,000 FCFA (3,810 to 6,100 EUR), with maintenance at 35,000, 75,000 or 120,000 FCFA per month depending on the level. Running costs come on top: SMS, WhatsApp messages, hosting.
The right tone for reminders
An effective automatic reminder stays courteous and precise: invoice number, amount, due date, payment link, direct contact. Separate key accounts (email to accounts payable, copy to the requester) from SME customers (more direct SMS and WhatsApp). Beyond 30 days, automatic reminders stop and a task is created for the sales rep or the CFO, to protect the relationship.
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Illustrative scenario: Moussa, CFO of an industrial maintenance SME in Dakar (60 staff), invoices 1.2 billion FCFA a year with 75 days DSO, about 246 million FCFA of receivables. He funds the gap with an overdraft at 9% a year. An automation project at 3,000,000 FCFA, plus about 25,000 FCFA a month of SMS and WhatsApp (300 invoices, 3 messages each), targets 20 fewer days of DSO. Cash freed: 1,200,000,000 x 20 / 365 = 65.7 million FCFA. Interest saved: 65.7 M x 9% = 5.9 million FCFA a year. Payback: about 6 months, not counting the manual reminder hours saved.
FAQ
Won't automatic reminders upset our customers?
Not if the tone is careful and the first reminder is preventive (3 days before). In practice, 20 to 30% of late payments come from simple oversight, which a reminder fixes.
Do we need to change invoicing software?
No, in most cases we connect to what you have, even a structured Excel file. The connection accounts for 400,000 to 1,200,000 FCFA of the budget depending on the tool.
How much do WhatsApp Business messages cost?
Meta charges template messages by category and country; for payment reminders in Senegal, count as an estimate a few FCFA to a few tens of FCFA per message, under 30,000 FCFA a month for 1,000 messages.
Does a Wave payment link work for B2B invoices?
Yes for amounts within merchant account limits, often up to several million FCFA. Above that, bank transfer remains available with bank details on the invoice.
How quickly do we see results?
First effects appear in the first billing cycle, 30 to 45 days. The full 15 to 25 day reduction is measured over 6 months.
Let's scope your project. Share your annual revenue, current DSO and invoicing tool: we will price the right dunning scenarios and payment link. 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.
