The verdict in three sentences
E-invoicing requires your invoices to pass through a PDP (Partner Dematerialisation Platform) in a structured format, with data transmitted to the tax authority. In 2026, a compliance project costs between 5,000 and 25,000 EUR, over 6 to 14 weeks, depending on the maturity of your ERP and billing tool. Failing to prepare exposes you to invoice rejections and penalties, with a direct hit to your treasury.
What a compliance project covers
Becoming compliant is not just picking a PDP. You must adapt your tools, formats and processes. Here are the work streams and their weight.
| Work stream | What it involves | Order of magnitude (EUR) |
|---|---|---|
| PDP choice and connection | Technical link to the platform | 2,000 to 6,000 |
| ERP/billing adaptation | Structured formats (Factur-X, UBL) | 2,000 to 10,000 |
| Lifecycle management | Invoice statuses, e-reporting | 1,500 to 6,000 |
| Acceptance and testing | Pilot sends, fixes | 1,000 to 4,000 |
| Team training | New processes | 500 to 2,000 |
The stream not to overlook is invoice status management: submitted, rejected, paid. These statuses drive your reminders and accounting; ignoring them creates gaps that are hard to recover.
Vendor solution or custom connector to a PDP?
Two paths exist for an SME: activate the vendor's module, or commission a custom connector to a PDP. Here is the 2026 comparison.
| Criterion | Vendor solution | Custom connector to PDP |
|---|---|---|
| Upfront cost | 0 to 3,000 EUR | 5,000 to 25,000 EUR |
| Monthly cost | Included or 20-80/month | 100 to 400/month maintenance |
| Flexibility | Low (vendor scope) | High (business rules) |
| Multi-tool | Often no | Yes |
| Timeline | 2-4 weeks | 6-14 weeks |
| Suited to | Standard tools | Specific ERP, high volumes |
If your billing fits a standard tool that offers the module, the vendor solution is enough. As soon as you have an in-house ERP, several invoice sources or high volumes, a custom connector secures compliance better.
Mini case study
Marc is CFO of an 80-employee trading SME, with an in-house ERP issuing 900 invoices per month. His ERP handles neither structured formats nor PDP connection natively. A rejected invoice delays cash-in by about 15 days, a non-trivial treasury cost on his monthly revenue of 1.2M EUR.
He commissions a custom ERP-to-PDP connector at 19,000 EUR, maintenance at 300 EUR/month. The 12-week project secures 100% of his invoices in compliant format and automates status feedback. The gain is not only an avoided cost: the team saves 25 hours per month of manual rejection tracking, about 700 EUR monthly, and above all eliminates the risk of penalties and blocked cash-in.
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FAQ
What does e-invoicing compliance cost in 2026?
Expect an order of magnitude of 5,000 to 25,000 EUR depending on tool maturity and volumes. An SME on a standard tool will spend less than a company with an in-house ERP to adapt.
What is a PDP and why connect your tools to it?
A PDP is a partner platform through which your electronic invoices and the data sent to the authority transit. Your billing tools must connect to it to issue and receive compliant invoices.
What is the risk if I am not compliant?
Your invoices can be rejected, delaying cash-in, and penalties may apply. The risk is both financial and operational, with a direct impact on treasury.
How much time should I plan?
Expect 6 to 14 weeks depending on ERP complexity and the number of invoice sources. Better to launch early to keep a calm pilot-testing window.
Do I need to change ERP to be compliant?
Not necessarily: a custom connector can link an existing ERP to a PDP without replacing it. Replacement is only justified if the ERP is end-of-life for other reasons.
Let's scope your project. Tell us your ERP, your billing tool and your invoice volume, and we will price your compliance project. 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.
