The verdict in three sentences
A custom accounting client portal ranges from 15,000 to 45,000 EUR excl. VAT in 2026, depending on the depth of document management and the integration with your production software. The real ROI is not the portal itself but the billable hours recovered: fewer reminders, no lost documents, faster closings. Plan for 10 to 16 weeks from mockup to production.
What an accounting portal covers and what it costs
A firm's client portal is more than a drop box. It orchestrates document collection, deliverable delivery (financial statements, tax returns, dashboards) and e-signature of engagement letters and annual accounts. The budget is driven mainly by how deeply it integrates with your production tool.
| Module | Scope | 2026 ballpark (EUR excl. VAT) |
|---|---|---|
| Portal core + auth | Client accounts, roles, dashboard | 6,000 - 10,000 |
| Document management / upload | Upload, auto-filing, OCR | 4,000 - 9,000 |
| E-signature | eIDAS simple/advanced, auto reminders | 3,000 - 6,000 |
| Production software connector | Cegid / ACD / Sage API, folder sync | 5,000 - 14,000 |
| Messaging & notifications | Secure thread, email, SMS | 2,000 - 4,000 |
| Client deliverables space | Statements, KPIs, invoices | 2,000 - 5,000 |
A firm of 6 to 12 staff typically targets a document-management + signature + connector core, a realistic envelope of 22,000 to 35,000 EUR excl. VAT.
Integration, GDPR and billable time saved
Integration with the accounting software is the line item that tips the budget. A two-way API sync with Cegid or ACD avoids double entry and makes folder reconciliation reliable.
| Item | Without portal | With custom portal |
|---|---|---|
| Document collection time / file / year | 100 % (baseline) | -30 % |
| Manual reminders per closing | 8 to 12 | 2 to 3 |
| Missing documents at closing day 0 | 25 to 40 % | 5 to 10 % |
| GDPR retention & audit trail | Scattered emails | Logged, encrypted |
| Average engagement-letter signing time | 6 to 10 days | 24 to 48 h |
On compliance, the portal centralizes consent, encrypts documents at rest and keeps an audit trail usable during an inspection. It is a sales argument as much as a GDPR requirement.
Mini case study
Marc, a partner at a 9-person firm in Bordeaux, manages 240 client files. Before, each staff member spent about 3 h per file per year on reminders and re-keying, i.e. 720 h at a loaded cost of 45 EUR/h, or 32,400 EUR of non-billable time. With a 28,000 EUR portal, he targets -30 % on that item, i.e. 9,720 EUR saved per year. The portal pays for itself in under 3 years, before counting the 15 to 20 extra files he can take on at constant headcount.
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FAQ
How long to deliver an accounting portal?
Plan for 10 to 16 weeks: 2 to 3 for scoping and mockups, 6 to 10 for development and integrations, 2 to 3 for testing and staff training.
Can it connect to Cegid or ACD?
Yes, via their APIs or dedicated connectors. The cost ranges from 5,000 to 14,000 EUR excl. VAT depending on the number of flows (files, entries, documents) and sync direction.
Is the e-signature legally valid?
Yes. An eIDAS simple or advanced signature covers engagement letters and annual accounts. The qualified level, more expensive, is reserved for sensitive deeds.
Is there a subscription on top of development?
Budget 150 to 500 EUR/month for secure hosting, plus the per-signature cost (0.50 to 2 EUR each) and evolutionary maintenance (10 to 18 % of the project per year).
Can a 3-person firm justify a custom portal?
Below 100 files, a packaged SaaS is often more cost-effective. Custom becomes relevant from 150 to 200 files or for a specific integration need.
Let's scope your project. Tell us your production software, your file volume and your target budget (15,000 to 45,000 EUR excl. VAT) and we'll frame the document-management and signature scope. 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.
