The verdict in three sentences
Automating B2B subscription billing with SEPA direct debit costs EUR 6,000 to 15,000 in integration for a company with 600 customers, over 4 to 8 weeks. Debit fees range from 0.2 to 0.8% or a flat fee per transaction, far below card processing. The real stake is the failure rate, which solid mandate handling, pre-notification and dunning bring below 2%.
What to automate, and at what price
The founder of a pharmacy software company in Dublin bills 600 subscriptions at EUR 180 a month, or EUR 108,000 in monthly recurring revenue. As long as billing runs on a spreadsheet, manual transfers and email reminders, the admin team spends several days a month on it and late payments weigh on cash flow. The target chain: electronic SEPA mandate signature at signup, automatic compliant invoices, fixed-date collection, bank reconciliation and graduated dunning.
| Component | Function | 2026 integration budget (EUR) |
|---|---|---|
| Electronic SEPA mandate | Online signature, unique reference, archiving | 1,000 to 2,500 |
| Subscription engine | Plans, per-customer add-ons, proration, plan changes | 1,500 to 4,000 |
| Compliant invoicing | Numbering, legal mentions, VAT, e-invoicing readiness | 1,000 to 2,500 |
| Collections and pre-notification | Schedule, 14-day notice or shorter contractual notice | 800 to 2,000 |
| Failed debits and dunning | Re-presentation, emails, fallback to card or transfer | 1,000 to 2,500 |
| Reconciliation and accounting export | Matching, export to the accounting tool | 700 to 1,500 |
The low end, EUR 6,000, matches an integration with an existing payment provider and a simple customer portal. At EUR 15,000, you add complex proration, e-invoicing through a certified network and a recurring revenue dashboard.
SEPA debit, card or transfer: the cost comparison
| Collection method | Typical 2026 fees | Monthly cost on EUR 108,000 | Observed failure rate |
|---|---|---|---|
| SEPA debit via online provider | 0.2 to 0.8% or EUR 0.20 to 0.50 flat | EUR 120 to 860 | 1 to 2% with dunning |
| SEPA debit via bank (XML file) | EUR 0.15 to 0.40 per item + subscription | EUR 90 to 300 | 1 to 3% |
| Recurring card | 1.4 to 2.9% + EUR 0.25 | EUR 1,660 to 3,280 | 3 to 6% (expired cards) |
| Customer-initiated transfer | EUR 0 | EUR 0 | 8 to 15% late |
| Cheque | Handling cost EUR 2 to 4 | EUR 1,200 to 2,400 | Frequent delays |
For a EUR 180 B2B subscription, SEPA debit is the cheapest and most stable option. The SEPA B2B scheme (as opposed to CORE) removes the 8-week refund right but requires the customer's bank to register the mandate: keep it for customers who agree, with CORE remaining the default for independent pharmacies.
Implementation schedule
| Week | Deliverable |
|---|---|
| 1 | Provider selection, plan and add-on modeling |
| 2 to 3 | Mandate signature flow, subscription engine |
| 3 to 4 | Invoices, pre-notifications, collection calendar |
| 4 to 6 | Failures, dunning, reconciliation, accounting export |
| 6 to 8 | Migration of 600 customers, mandate collection, switchover |
Migrating existing customers is the trickiest step: plan a 4-week mandate collection campaign with 2 reminders and a target signature rate of 85% in the first month.
Mini case study
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Julie, co-founder and CFO of the Dublin software company, currently sees 9% of payments more than 15 days late and spends 2.5 days a month chasing and reconciling. After a EUR 11,000 integration, the failure rate drops to 1.8%. On EUR 108,000 a month, that means about EUR 7,800 of cash collected on time each month instead of late, and 2 days of admin work saved, roughly EUR 6,000 a year. Moving the 30% of customers paying by card to direct debit cuts fees by around EUR 600 a month. Estimated payback: 9 to 10 months.
FAQ
How much does SEPA direct debit integration cost for B2B subscriptions?
Between EUR 6,000 and 15,000 depending on plan complexity and accounting integrations. Per-debit fees then stay at 0.2 to 0.8% or a flat fee of a few tens of cents.
Should we use the SEPA CORE or B2B scheme?
CORE suits most customers and allows 8 weeks for disputes. B2B removes that window but requires the customer to act with their bank, so adoption is often below 40%.
How long to switch 600 customers?
Plan 4 to 8 weeks of project time, including 4 weeks of mandate collection. An 85% signature rate within a month is realistic with 2 reminders.
How do we reduce failed debits?
Pre-notify the amount, collect shortly after the customer's revenue date, automatically re-present within 5 days and offer a card fallback. These rules bring failures below 2%.
Is e-invoicing covered?
Yes, the system can send invoices through a certified e-invoicing network, adding EUR 1,500 to 3,000 to the project depending on the provider.
Let's scope your project. Tell us about your subscription plans, customer volume and accounting tool, and we will price an integration 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.
