The verdict in three sentences
A billing connector (Sage, Pennylane, EBP) costs 6,000 to 15,000 EUR in 2026; a payroll connector climbs to 8,000 to 18,000 EUR. Expect 6 to 12 weeks, with 2026 e-invoicing compliance built in. Payback is fast: -60% double entry and a sharp drop in accounting errors.
The flows to sync
A successful accounting integration first maps the flows: who produces the data, who consumes it, in which direction. Each automated flow removes an error-prone manual re-entry.
| Flow | Direction | Frequency | Main gain |
|---|---|---|---|
| Customers / third parties | Business → Billing | Real time | No duplicate customer records |
| Sales invoices | Business → Billing | Daily | Compliant e-invoicing |
| Payments | Billing → Business | Daily | Up-to-date cash tracking |
| Payroll variables | Business → Payroll | Monthly | Hours, bonuses without re-entry |
| Payslips / journal entries | Payroll → Accounting | Monthly | Automatic entries |
| Analytics / cost centers | Bidirectional | Daily | Reliable reporting |
Cost, line by line
Price depends on the number of flows, target API quality (Pennylane and Sage expose modern APIs) and volume. 2026 e-invoicing compliance (formats and platforms) is now a distinct line item.
| Item | 2026 range (EUR) | Timeline |
|---|---|---|
| Billing connector (Sage/Pennylane) | 6,000 - 15,000 | 4-8 wks |
| Payroll connector | 8,000 - 18,000 | 6-10 wks |
| E-invoicing compliance | 2,500 - 6,000 | 2-4 wks |
| Migration + third-party dedupe | 1,500 - 4,000 | 1-2 wks |
| Monthly maintenance | 250 - 600 /mo | ongoing |
Mini case study
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Sophie, CFO of a services SME in Bordeaux (60 staff), links her business software to Pennylane and her payroll tool. Quote: billing connector 11,000 EUR, payroll connector 13,000 EUR, e-invoicing compliance 4,000 EUR, i.e. 28,000 EUR over 10 weeks. Maintenance: 450 EUR/month.
Previously, accounting re-keyed invoices and payroll variables ~20 h/week. A 60% cut = 12 h/week saved × 46 weeks × 35 EUR = 19,320 EUR/year, before avoided errors and penalties. Payback in ~18 months, then recurring net gain.
FAQ
Is 2026 e-invoicing included? Yes, we bake compliance (formats and platform transmission) into the billing connector. Budget 2,500 to 6,000 EUR depending on your starting software.
Can we connect Sage and Pennylane at once? Yes, but each target is a separate connector to quote. If you're migrating between them, lock the target before building to avoid paying twice.
What's the real ROI? Automation removes ~60% of double entry and much of the accounting errors. For a 2-person accounting team, annual savings often top 15,000 EUR.
Payroll connector: why pricier? Payroll involves sensitive data (GDPR), complex rules and a strict monthly calendar. Hence the 8,000-18,000 EUR range and 6-10 week timeline.
Must we pause operations during integration? No: we build and test in a dedicated environment, then switch flow by flow. Data migration (1,500-4,000 EUR) happens in a short scheduled window.
Let's scope your project. List your software (business, billing, payroll) and priority flows: we price each connector with ROI and e-invoicing compliance. 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.
