The verdict in three sentences
A client portal with billing and order tracking costs between EUR 20,000 and 50,000 in Berlin in 2026, excluding the link to your accounting tool. Add EUR 6,000 to 15,000 for ERP/accounting sync and online payment, over an 8 to 14 week timeline. The financial impact is direct: 30 % fewer chase-ups and DSO cut by 5 to 12 days.
What a billing client portal funds
Giving clients access to their invoices and orders transforms collections: they view, download and pay without going through your teams. The budget centres on three blocks: document display, online payment and synchronization with your accounting.
| Item | 2026 range (EUR) | Detail |
|---|---|---|
| Client area + auth | 6,000 - 12,000 | Login, roles, dashboard |
| Billing module | 7,000 - 16,000 | Invoices, credit notes, PDF download |
| Order tracking | 5,000 - 12,000 | Statuses, history, tracking |
| Online payment | 3,000 - 8,000 | Card, transfer, auto reminders |
| Accounting/ERP sync | 6,000 - 15,000 | Invoice and payment sync |
| Indicative total | 27,000 - 63,000 | Depending on automation level |
2026 ballpark: an "invoice consultation" area stays under EUR 30,000; adding online payment and automatic reconciliation pushes toward EUR 50,000 and beyond.
Custom build vs the ERP's native portal
Many ERPs already offer a client portal. It is integrated but often rigid and poorly designed. The comparison hinges on your priority: cost or experience.
| Criterion | Native ERP portal | Custom client area |
|---|---|---|
| Upfront cost | EUR 5,000 - 15,000 (config) | EUR 27,000 - 63,000 |
| Client experience (UX) | Basic, generic | Optimized, on-brand |
| Online payment | Module-dependent | Integrated, multi-method |
| Rule flexibility | Limited | Total |
| Observed DSO reduction | 3 - 7 days | 5 - 12 days |
| Client adoption | Medium | High |
| Timeline | 4 - 8 weeks | 8 - 14 weeks |
The native portal is enough for a minimum viable option. Custom is justified as soon as client experience and adoption rate become a cash-flow lever.
Mini case study
Claire, CFO of a technical services SME in Berlin (EUR 6.2M revenue), runs a 58-day DSO and an average outstanding of EUR 985,000. Her teams spend 90 hours/month chasing invoices. She invests EUR 41,000 in a client area with invoices, order tracking and online payment.
After six months, DSO drops to 49 days (-9 days), freeing roughly EUR 153,000 of cash. Chase-ups fall 30 %, saving 27 hours/month (at EUR 34/hour loaded: EUR 918/month). Between the cash-flow gain and admin time, the client area pays back in under 24 months on the collections line alone.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
What budget for a client portal with billing?
Expect EUR 20,000 to 50,000 in Berlin in 2026, plus EUR 6,000 to 15,000 for accounting/ERP integration. Integrated online payment adds EUR 3,000 to 8,000.
How much does a client portal reduce DSO?
A 5 to 12 day reduction is common when clients can view and pay their invoices independently. On a large receivables book, the cash effect is immediate.
Do I need to connect the portal to accounting?
Yes, without sync invoices and payments must be entered twice. The accounting/ERP link (EUR 6,000 to 15,000) is what makes the gain durable.
What is the implementation timeline?
Between 8 and 14 weeks depending on the automation level. Billing and reconciliation are the most technical parts of the project.
Isn't my ERP's native portal enough?
It is enough for basic consultation. Once client experience and adoption matter, custom delivers a lower DSO and better cash flow.
Let's scope your project. Tell us your ERP/accounting tool, your invoice volume and your current DSO, and we will size a cash-flow-focused client area. 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.
