The verdict in three sentences
For an SMB with EUR 3M in revenue (about GBP 2.6M), every day of DSO you remove releases roughly EUR 8,200 of cash. A reminder tool costs EUR 50 to 300 per month excluding VAT, a custom automation connected to your ERP EUR 5,000 to 15,000, and both bring DSO down by 10 to 20 days within six months. The real lever is not the tool but the reminder playbook: sequence, tone, escalation and up-to-date payment data.
What your late payments really cost
A DSO of 68 days means you finance your customers for more than two months. On EUR 3M of annual sales, average receivables reach 3,000,000 / 365 × 68, roughly EUR 559,000. At a short-term funding cost of 5% (overdraft, invoice finance), that receivables book costs nearly EUR 28,000 a year, before counting the hours your finance team spends chasing by hand.
| Target DSO | Receivables (EUR 3M revenue) | Cash released vs 68 days | Finance cost saved (5%) |
|---|---|---|---|
| 68 days (current) | EUR 559,000 | EUR 0 | EUR 0 |
| 60 days | EUR 493,000 | EUR 66,000 | EUR 3,300/yr |
| 56 days | EUR 460,000 | EUR 99,000 | EUR 4,950/yr |
| 52 days | EUR 427,000 | EUR 132,000 | EUR 6,600/yr |
| 48 days | EUR 395,000 | EUR 164,000 | EUR 8,200/yr |
| 45 days (common contractual term) | EUR 370,000 | EUR 189,000 | EUR 9,450/yr |
2026 order of magnitude: most SMBs moving from irregular manual chasing to an automated sequence gain 12 to 20 days in the first year. The direct financial saving is modest, the released cash is substantial: it funds a hire, inventory, or avoids a credit line.
Off-the-shelf tool or custom automation
SaaS credit-control tools (Chaser, Upflow, Xero or QuickBooks add-ons, Sidetrade for larger firms) cover 80% of needs: email sequences, payment links, receivables dashboard. Custom work makes sense when your data is scattered (in-house ERP, several entities, payment terms per customer) or when you want to trigger business actions, such as blocking new orders above an overdue threshold.
| Criterion | Reminder SaaS | Custom automation |
|---|---|---|
| Upfront cost | EUR 0 to 1,500 setup | EUR 5,000 to 15,000 |
| Recurring cost | EUR 50 to 300/month | EUR 30 to 120/month (hosting, email) |
| Time to go live | 1 to 3 weeks | 4 to 8 weeks |
| ERP connection | Standard connectors (Xero, Sage, Odoo) | Any source, including in-house ERP |
| Business rules | Simple sequences and segments | Order blocking, sales escalation, SMS, calls |
| 3-year cost (excl. internal time) | EUR 1,800 to 12,300 | EUR 6,100 to 19,300 |
| Best fit | Single-entity SMB, standard ERP | Multi-entity, high volume, specific processes |
The reminder playbook that lowers DSO
An effective sequence starts before the due date. A friendly reminder at D-5, a factual reminder at D+3 with a payment link, a firm reminder at D+15 citing statutory late payment interest (in the UK, Bank of England base rate + 8 points plus fixed compensation of GBP 40 to 100), then escalation to the account manager at D+30 and a formal letter before action at D+45. Automation mainly guarantees consistency: the right reminder on the right day for every customer, regardless of the finance team's workload.
| Step | Trigger | Channel | Observed payment rate (estimate) |
|---|---|---|---|
| Pre-due reminder | D-5 | Email + invoice PDF | 25 to 35% paid on time |
| Reminder 1 | D+3 | Email + payment link | 20 to 30% of the rest |
| Reminder 2 | D+15 | Email + SMS | 15 to 25% of the rest |
| Sales escalation | D+30 | CRM task for account manager | 10 to 20% of the rest |
| Letter before action | D+45 | Tracked electronic letter | 5 to 10% of the rest |
| Collections | D+60 | Debt collection agency | Case by case |
Mini case study
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Claire, CFO of an industrial distribution SMB in London (EUR 3M revenue, 420 active customers), chased overdue invoices twice a month when time allowed. She commissioned a custom automation for EUR 9,500, connected to her ERP, with a five-step sequence and automatic blocking of new orders beyond 60 days overdue. Six months later, DSO fell from 68 to 52 days: EUR 132,000 of cash released, an EUR 100,000 overdraft facility closed (EUR 5,000 of interest avoided per year) and 1.5 days a month returned to her credit controller, roughly EUR 4,300 a year. The project pays for itself in under 12 months on direct gains alone.
FAQ
How long before DSO goes down?
First effects appear in month two, when invoices issued after go-live reach their due date. The full reduction of 10 to 20 days is usually visible between months four and six.
Do automated reminders damage customer relationships?
Not if the tone is graduated and personalised: the D-5 reminder is perceived as a service. SMBs that exclude their 10 to 20 strategic accounts from the automatic sequence and handle them directly see no rise in disputes.
Do we need to change ERP to automate reminders?
Rarely. SaaS tools connect to Xero, Sage, QuickBooks or Odoo, and a custom automation reads data from any ERP via export, database or API, for an extra EUR 1,500 to 4,000.
Does e-invoicing change anything?
Yes, for the better: where e-invoicing networks are in place (Peppol in the UK public sector, mandatory reception in France since September 2026), invoice status flows back automatically. The automation can then chase only invoices that were actually received.
What budget should a EUR 3M SMB plan?
Allow EUR 1,200 to 3,600 a year for SaaS, or a one-off EUR 5,000 to 15,000 for custom. With EUR 100,000 or more of cash released, payback is measured in months.
Let's scope your project. Send us your current DSO, your ERP and the number of invoices issued per month, and we will price a payment reminder automation between EUR 5,000 and 15,000, delivered in 4 to 8 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.
