The verdict in three sentences
A 92-day DSO means a company waits three months on average to collect its invoices, forcing it to fund clients through an overdraft or by delaying its own suppliers. An automated dunning sequence across three channels (email, SMS, WhatsApp), with a payment link (card, Interac, bank transfer) in every message, turns each reminder into an immediate chance to pay. For USD 4,000 to 10,000 (about 2.5 to 6 million FCFA), a 60-day target frees roughly USD 100,000 of cash on USD 300,000 of receivables.
Why manual collections fail
In most SMBs, collections depend on one person in accounting who calls when time allows, with no shared history. The result: late reminders, inconsistent tone, forgotten payment promises. Clients pay whoever follows up most consistently.
| Channel | Estimated open rate | 2026 unit cost | Recommended use |
|---|---|---|---|
| 20 to 35% | Near zero | Invoice delivery, D-3 reminder, monthly statement | |
| SMS | 90% and above | USD 0.01 to 0.05 | Short D+3 reminder with payment link |
| WhatsApp Business (API) | 85 to 95% | USD 0.02 to 0.10 per template message | D+10 and D+20 reminders, conversation with client |
| Human call | Variable | USD 3 to 6 (agent time) | From D+30, large balances |
| Formal demand letter | High | USD 10 to 25 | D+45, before collections agency |
The winning mix is graduated: courteous at first, progressively firmer, with a human taking over on large accounts.
What the solution includes and what it costs
The solution plugs into your invoicing software (QuickBooks, Xero, Odoo, structured spreadsheet) and runs the sequence without daily intervention.
| Component | Function | Indicative budget |
|---|---|---|
| Invoicing integration | Automatic import of invoices and due dates | USD 800 to 2,000 |
| Sequence engine | Sequences per client segment (SMB, key accounts, public sector) | USD 1,100 to 2,500 |
| Email, SMS, WhatsApp sending | Approved templates, personalisation, send windows | USD 650 to 1,600 |
| Built-in payment link | Card, Interac, transfer, automatic reconciliation | USD 800 to 2,100 |
| Promise-to-pay dashboard | Promises, reminder if broken, real-time DSO | USD 650 to 1,600 |
| AI assistant (option) | Drafting replies, prioritising accounts to call | Included in the upper version |
| Total | Depending on scope | USD 4,000 to 10,000 |
Recurring costs to plan for: messages (about USD 80 to 250 per month for 400 active clients), payment provider fees (1 to 3.5% depending on method) and maintenance of USD 120 to 200 per month.
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Mini case study
Megan, CFO of a services SMB in Toronto, generates about USD 1.19 million in annual revenue with USD 300,000 in receivables, a DSO of 300 / 1,190 × 365 = 92 days. The company pays 10% interest on its credit line.
After a USD 6,600 project (about 4 million FCFA), the 60-day target brings receivables down to 1,190 × 60 / 365 = about USD 195,000: USD 105,000 of cash freed, rounded to USD 100,000 for prudence. Interest savings reach USD 10,000 a year, plus the time recovered by the accountant (about 2 days a week). Estimated yearly recurring costs: USD 4,000. The project pays back in the first year, and the cash effect shows within 3 to 4 months.
FAQ
Won't clients resent a WhatsApp reminder? Not if the tone is courteous and the message useful: amount, due date and a link to pay in 30 seconds. In practice, 15 to 25% of invoices reminded via WhatsApp are paid within 48 hours.
Do clients need to consent to SMS and WhatsApp? Yes, Canada's anti-spam law (CASL), privacy rules and Meta's policies require consent and approved message templates. We add the wording to your terms and invoices.
How are payments reconciled? Each payment link carries the invoice reference: on confirmation, the invoice is marked paid and the sequence stops, with no manual entry.
What about public-sector clients paying at 120 days? We create a dedicated segment with administrative follow-ups (purchase order tracking, accounts payable contact) rather than SMS, since a payment link is useless there.
How long does setup take? Allow 4 to 8 weeks, including 2 weeks of testing on a sample of 50 clients before rolling out to the full portfolio.
Let's scope your project. Share your receivables, DSO and invoicing software: we will price the dunning sequence, its timeline and the cash it can free. 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.
