The verdict in three sentences
Every VAT-registered SME must issue and receive invoices via a compliant platform: the subscription alone (20-80 EUR/month) suffices if your billing tool already exports clean structured invoices. A custom ERP connector (5 000-15 000 EUR) becomes essential as soon as your invoices come from a business system or ERP that does not natively speak the regulatory formats. The stake is not just compliance: it is avoiding the penalty per non-compliant invoice and the automatic rejection of your supplier invoices.
Platform + connector: 2026 figures
Order of magnitude for 2026, Berlin market, depending on your technical starting point.
| Item | 2026 amount |
|---|---|
| Platform subscription | 20 - 80 EUR/month |
| Cost per issued invoice | 0.10 - 0.50 EUR |
| Custom ERP connector | 5 000 - 15 000 EUR |
| Format compliance upgrade | 3 000 - 8 000 EUR |
| e-reporting (B2C/international) | Included to 2 000 EUR |
| Implementation timeline | 4 - 8 weeks |
| Penalty per non-compliant invoice | 15 EUR (annual cap 15 000 EUR) |
Three compliance scenarios
Total cost depends on your existing stack. 2026 order-of-magnitude estimate.
| Scenario | Upfront investment | Annual recurring cost |
|---|---|---|
| Billing tool already compatible | 0 - 1 000 EUR | 240 - 960 EUR |
| Software to upgrade + platform | 3 000 - 8 000 EUR | 500 - 1 500 EUR |
| Business ERP + custom connector | 8 000 - 15 000 EUR | 1 000 - 2 500 EUR |
| Multi-entity + complex e-reporting | 15 000 - 30 000 EUR | 2 500 - 5 000 EUR |
Mini case study
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Karim, CFO of a 40-employee industrial trading SME in Berlin. He issues around 3 200 invoices/year from an aging business ERP that does not generate structured invoices. Without compliance, the theoretical risk is 3 200 x 15 EUR = 48 000 EUR in penalties, capped at 15 000 EUR/year, plus blocked collections. He commissions a custom connector between his ERP and a compliant platform (12 000 EUR) + subscription (60 EUR/month, i.e. 720 EUR/year). Total first-year investment: 12 720 EUR, paid back on the first penalty avoided, with zero manual entry thanks to flow automation.
FAQ
What exactly is a compliant platform? A registered dematerialisation platform that transmits your invoices in the regulatory format and reports e-reporting data. You must choose one, as the free public portal was dropped.
Is my current software enough? If it exports compliant structured formats, a simple subscription suffices. Otherwise a connector or format upgrade is needed, hence the prior audit.
What is the real financial risk? 15 EUR per non-compliant invoice (annual cap 15 000 EUR) plus rejection of your invoices by clients and blocking of supplier invoices you cannot process.
How long to be ready? 4 to 8 weeks for a custom connector including issue and receipt tests. Do not wait for the final deadline: integration slots fill up.
Is e-reporting included? It sits alongside e-invoicing for B2C and international transactions. Budget around 2 000 EUR to integrate it into the flow, often in the same connector.
Let's scope your project. Tell us your current billing software, annual invoice volume and international flows, and we will audit your compliance and price the connector (indicative budget 5 000 - 15 000 EUR). 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.
