The verdict in three sentences
In B2B, every day of DSO (average collection period) ties up your cash; cutting it by 15 days on 3M EUR of revenue frees about 123,000 EUR of cash. The fastest lever is online invoice payment combined with SEPA direct debit and automated dunning. For 4,000 to 15,000 EUR of setup, a well-run project pays back in under 6 months.
B2B payment methods and cash-flow impact
Let's compare the main methods for settling trade invoices, 2026 ballpark.
| Payment method | 2026 fees | Collection time | Customer effort | DSO reduction |
|---|---|---|---|---|
| Manual bank transfer | 0 % | 5 - 15 days | High | Baseline |
| Card (payment link) | 1.4 - 2.5 % | Instant - 2 d | Low | -8 to -15 d |
| SEPA B2B direct debit | 0.3 - 0.8 % | 2 - 3 d | None (recurring) | -12 to -20 d |
| Online invoice payment | 0.5 - 1.5 % | Instant - 2 d | Low | -10 to -18 d |
| Financing / split payment | 1.5 - 3.5 % | Instant | Low | -20 to -25 d |
SEPA offers the best cost/DSO-reduction ratio for recurring customers; the card payment link maximizes conversion on one-off invoices.
Setup cost and return on investment
The project combines technical integration and dunning automation. 2026 estimate.
| Line item | 2026 range | Comment |
|---|---|---|
| Invoice payment portal | 4,000 - 9,000 EUR | Per-invoice link, automatic receipt |
| SEPA direct debit (mandates) | 2,000 - 4,000 EUR | B2B mandate management |
| Automated dunning | 1,500 - 3,500 EUR | Emails D-3, D+0, D+7, D+15 |
| Accounting / ERP integration | 3,000 - 8,000 EUR | Automatic reconciliation |
| Annual transaction fees | 0.5 - 2.5 % of collected revenue | Depending on method |
For an SME with 3M EUR of revenue, a 15-day DSO reduction and lower unpaid invoices are enough to pay back a 12,000 EUR budget within a few months.
Automating dunning to hold DSO
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Technology alone is not enough without dunning discipline. Program a sequence: a courteous reminder 3 days before due date, a follow-up on the due date with a payment link, then at D+7 and D+15 with escalation. Each reminder carries a one-click payment link. This automation typically cuts late payments by 30 to 50 % and frees your accountants from manual chasing.
Mini case study
Claire, CFO of an industrial SME in Lyon, has a DSO of 58 days on 3.2M EUR of revenue. She deploys a payment portal, SEPA direct debit and automated dunning for 12,500 EUR. In 6 months, DSO drops to 40 days (-18 days), freeing 158,000 EUR of cash, and unpaid invoices fall by 40 %. Transaction fees (1.2 % on 1.8M EUR collected online = 21,600 EUR/year) stay largely covered by the cash gain and accounting time saved.
FAQ
Is online payment suited to B2B? Yes: per-invoice payment links, SEPA and split payment fit B2B amounts and terms. The cultural preference for transfers fades quickly against one-click simplicity.
What does cutting DSO cost? Setup ranges from 4,000 to 15,000 EUR depending on scope, plus transaction fees of 0.5 to 2.5 %. The return is measured in freed cash and accounting time saved.
Is SEPA secure for large amounts? Yes, SEPA B2B direct debit (the B2B scheme) suits companies with signed mandates and no refund right, which secures collection.
How do I avoid unpaid invoices? Combine a per-customer credit limit, automatic direct debit, scheduled dunning and payment on order for new customers. The reduction often reaches 40 %.
Can we integrate our accounting software? Yes: automatic reconciliation syncs payments and invoices with your ERP or accounting software, removing manual entry. Expect 3,000 to 8,000 EUR.
Let's scope your project. Share your current DSO, your revenue and your target payment methods: we price the portal, SEPA and dunning. 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.
