The verdict in three sentences
A client portal for an accounting firm costs between 20,000 and 45,000 EUR (excl. VAT) in 2026, delivered in 10 to 14 weeks. The key features are the secure document vault, e-signature (1 to 3 EUR/document) and integrated document management (DMS). The immediate gain: document collection time cut by around 50% and finally traceable exchanges.
What a firm's portal must contain
A firm exchanges hundreds of sensitive documents each month: invoices, statements, payslips, tax filings. A portal structures these flows and replaces scattered emails.
| Feature | Cost 2026 (excl. VAT) | Benefit |
|---|---|---|
| Document vault | 5,000 - 10,000 EUR | Secure upload, auto filing |
| E-signature | 1 - 3 EUR/doc | Signed filings and engagement letters |
| Integrated DMS | 4,000 - 9,000 EUR | Search, versioning, archiving |
| Guided document requests | 3,000 - 6,000 EUR | Automatic reminders |
| Client / staff roles | 2,500 - 5,000 EUR | Confidentiality per case |
| Notifications and reminders | 1,500 - 3,000 EUR | Fewer manual follow-ups |
2026 order of magnitude for a mid-sized firm; e-signature is often also billed as an annual package.
Total cost and maintenance
Beyond development, a firm must budget recurring running costs, especially signature and maintenance.
| Item | Cost 2026 | Frequency |
|---|---|---|
| Portal development | 20,000 - 45,000 EUR | one-off |
| Secure hosting (EU data) | 80 - 200 EUR | per month |
| E-signature | 1 - 3 EUR | per document |
| Maintenance | 250 - 500 EUR | per month |
| Security / compliance audit | 1,500 - 3,500 EUR | per year |
| Encrypted backups | 30 - 70 EUR | per month |
Maintenance at 250 to 500 EUR/month covers fixes, security updates and small improvements: essential when the portal holds tax and payroll data.
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Mini case study
Sophie, partner at a 12-staff accounting firm in Bordeaux, manages 240 clients. Each closing requires on average 45 minutes of document collection and chasing per case, roughly 180 hours per month across the portfolio.
She invests 32,000 EUR in a portal with a vault, guided document requests and automatic reminders. Collection time drops by 50%, or 90 hours saved per month. Valued at 45 EUR/h fully loaded, the saving reaches 48,600 EUR/year. Adding e-signature (about 3,000 EUR/year for 1,500 documents), the recurring cost stays far below the gain: the portal pays back within the first year, with staff time redeployed to higher-value advisory work.
FAQ
Does the portal replace our accounting production software? No: it interfaces with it. The portal handles the client relationship (upload, signature, exchange) while your production software keeps the accounting work. A connector can sync documents and case statuses.
Does e-signature have legal value? Yes, a qualified or advanced e-signature compliant with eIDAS has full legal value for your engagement letters and filings. Budget 1 to 3 EUR per document or an annual package.
Where is the data hosted? On European hosting, ideally in-country, with encryption at rest and in transit. For tax and payroll data, a certified host and daily encrypted backups are essential.
How long to deploy the portal? From 10 to 14 weeks: 2-3 weeks framing document types and roles, 6 to 8 of development, 2 to 3 of testing and training staff and clients.
How do we get clients to use it? Through guided document requests, automatic reminders and a simple mobile interface. Assisted onboarding and phasing out email document exchange push adoption above 80% within a few months.
Let's scope your project. Tell us your client count, your production software and your signature needs, and we will price a compliant portal your clients will actually use. 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.
