The verdict in three sentences
Connecting your business software, ERP and payroll costs, in 2026, between 20,000 and 55,000 EUR for an 8-to-14-week project. The return is operational and fast: -25 h/month of re-entry, month-end closing 4 days earlier and -45 % errors on journal entries. The key is not the technical connector but reconciling the partner and accounting master data across your three systems.
Detailed connector costs
An integration links systems that do not speak the same language. Cost depends on the number of flows, API richness and the state of your master data. 2026 orders of magnitude for a Berlin SME/mid-market firm.
| Integration flow | 2026 range (EUR) | Timeline |
|---|---|---|
| Business software -> ERP connector | 10,000-22,000 | 3-5 weeks |
| Partner sync (customers/suppliers) | 4,000-10,000 | 1-3 weeks |
| Automated accounting entries | 5,000-14,000 | 2-4 weeks |
| ERP -> payroll connector | 6,000-18,000 | 2-4 weeks |
| Testing, UAT, go-live | 4,000-9,000 | 1-2 weeks |
| Project total | 20,000-55,000 | 8-14 weeks |
A senior integrator's day rate ranges from 550 to 850 EUR in 2026. Maintenance at 350-800 EUR/month keeps connectors current through API or chart-of-accounts changes.
The ROI of a successful integration
Double entry is the most common hidden cost: it ties up skilled time and produces errors that surface at closing. Estimates for an SME finance/payroll team.
| Indicator | Before (manual entry) | After (integrated) | Gain |
|---|---|---|---|
| Data-entry hours / month | 40 h | 15 h | -25 h |
| Monthly closing time | 9 days | 5 days | -4 days |
| Entry error rate | ~5.5 % | ~3 % | -45 % |
| Partner update lag | 2-3 days | real time | -95 % |
| Reconciliation gaps | frequent | rare | higher quality |
What makes projects fail
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Three classic traps: inconsistent partner master data across systems (the same customer under three different codes), poor vendor-side APIs forcing fragile file exports, and no master-data governance. You secure it with an upstream master-data reconciliation phase, documented mapping and a flow log with alerts on sync failure.
Mini case study
Marc, CFO of a services SME in Berlin, 45 staff, still manually keys entries between his business software, ERP and payroll. Integration cost: 38,000 EUR + 550 EUR/month maintenance. Before, his team spent 40 h/month re-entering data (at ~40 EUR/h loaded, i.e. 1,600 EUR/month) and closing took 9 days. After: 15 h/month (600 EUR), closing in 5 days, errors nearly halved. Direct monthly gain: 1,000 EUR of time plus fewer VAT errors. Payback (38,000 EUR): about 32 months on entry time alone, far faster once you factor an earlier close and reliable payroll.
FAQ
Do we have to change ERP to integrate? No, if your ERP exposes APIs or structured imports. We build a connector on top of the existing setup; replacing the ERP is justified only if it is closed or obsolete.
How soon are the first gains? The most profitable flows (entries and partners) often ship in 4-6 weeks. Entry-time savings are measurable from the first month in production.
What does maintenance cover? Connector upkeep through API, chart-of-accounts or payroll-rate changes, plus flow monitoring. Budget 350-800 EUR/month depending on the number of connectors.
Is integrating payroll risky? It is the most sensitive flow: we secure it with automatic reconciliation and a human validation before each submission. The goal is to remove re-entry, not control.
Can we integrate in stages? Yes, and it is recommended: start with the best-ROI flow (often partners + entries), validate, then add payroll. Each batch goes live independently.
Let's scope your project. Specify your three systems (business software, ERP, payroll), their available APIs and your monthly entry volume: we price the priority connectors by ROI. 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.
