The verdict in three sentences
Moving from a DSO of 68 to 45 days on EUR 7 million of revenue frees around EUR 440,000 of cash, far more than the cost of automation at EUR 4,000 to 10,000. A reminder SaaS at EUR 150 to 400 a month is enough if your processes are standard, while a build connected to your accounting becomes relevant once payment terms, key accounts or disputes fall outside the template. Either way, the most visible operational gain is one day a week freed for your credit controller.
Reminder SaaS or custom automation
Reminder tools on the market handle simple cases well: invoice issued, due date, scheduled reminders. They get expensive or limited when you need payment plans, deposits, mandatory purchase order numbers or large customers' supplier portals.
| Criterion | Reminder SaaS | Custom automation |
|---|---|---|
| Entry cost | EUR 0 to 1,500 setup | EUR 4,000 to 10,000 |
| Recurring cost | EUR 150 to 400 per month | EUR 40 to 120 per month (hosting, SMS) |
| 3-year cost | EUR 5,400 to 15,900 | EUR 5,400 to 14,300 |
| Accounting connection | Standard connectors (Xero, Sage, QuickBooks) | API connection or tailored scheduled export |
| Reminder scenarios | Predefined templates | Rules by customer, amount, age |
| Dispute handling | Free-text note | Blocking status, sales approval workflow |
| Data | With the vendor | With you, reusable in your reporting |
As a 2026 order of magnitude, both options converge over three years. The decision rests on how complex your customer book is, not on price.
The reminder sequence that lowers DSO
An effective reminder starts before the due date. The most profitable rule is confirming the invoice was received at D+3, which removes most "we never got the invoice" replies at D+45.
| Step | Timing | Channel | Content | Observed effect |
|---|---|---|---|---|
| Confirmation | D+3 after issue | Invoice attached, approval request | 30% of disputes caught earlier | |
| Pre-reminder | D-5 before due date | Polite reminder, payment link | 15 to 20% more on-time payments | |
| Level 1 | D+5 after due date | Friendly reminder with statement | Settles 50% of late payments | |
| Level 2 | D+15 | Email and SMS | Firm reminder, statutory late payment interest | Settles 30% of the rest |
| Level 3 | D+30 | Formal letter and scheduled call | Final demand, EUR 40 fixed compensation under the EU late payment rules | Hand-off to collections if it fails |
| Reporting | Every Monday | Dashboard | Aged debt, top 10 late payers | Informed sales decisions |
A typical build takes 5 to 7 weeks: accounting connection (1 to 2 weeks), rules engine and templates (2 weeks), email and SMS sending with tracking (1 week), dashboard and testing (1 to 2 weeks).
Mini case study
Ciaran, finance director of a 45-employee manufacturing SME in Dublin, turns over EUR 7,000,000 with a DSO of 68 days, about EUR 1,300,000 in receivables. Bringing DSO down to 45 days frees 23 days of revenue: 7,000,000 / 365 × 23 = EUR 441,000 of cash. At a 5% short-term financing cost, the saving reaches EUR 22,000 a year.
His credit controller spends one day a week on reminders, about 330 hours a year at EUR 40 loaded: EUR 13,200. With custom automation at EUR 7,500 and EUR 80 a month to run, the project pays back in under 3 months, and the freed cash avoids an expensive overdraft facility.
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FAQ
How much does invoice reminder automation cost an SME in 2026?
A SaaS costs EUR 150 to 400 a month, a build connected to your accounting EUR 4,000 to 10,000, plus EUR 40 to 120 a month to run. Over three years, budgets are close.
What DSO improvement can we expect?
As an order of magnitude, 15 to 25 days in the first year when reminders used to be irregular. Going from 68 to 45 days is a realistic target for a manufacturing SME.
Will automatic reminders upset our good customers?
Not if the rules single out strategic accounts: adapted tone, sales approval before level 3, pause during a dispute. These exceptions often represent 10 to 15% of the book.
Can we send reminders by SMS in Ireland?
Yes for business contacts, as long as it stays within amicable collection. An SMS costs about EUR 0.05 to 0.08 and clearly improves read rates.
Does e-invoicing change anything?
Yes: invoice statuses returned by an e-invoicing network such as Peppol (delivered, rejected, paid) can feed the reminder engine directly. The build plans for this connection, usually EUR 1,500 to 3,000.
Let's scope your project. Share your revenue, current DSO and accounting software, and we will price automation between EUR 4,000 and 10,000 delivered in 5 to 7 weeks. 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.
