The verdict in three sentences
A custom client portal for an accounting firm costs between 25 000 and 65 000 EUR in 2026 depending on upload, OCR and signature features. The real ROI is measured in data-entry time saved: 30 to 50 % on document collection and matching. A well-designed portal ships in 8 to 14 weeks and pays off within the first fiscal year at a mid-size firm.
What a useful portal must cover
A portal that is merely a file space changes nothing. What makes the difference: OCR that pre-fills entries, e-signature that removes paper round-trips, and automated reminders that offload follow-up from staff. Add per-file contextual messaging and a filing-deadline dashboard, and clients stop emailing documents.
Features and measured time saving (2026 order of magnitude)
| Feature | Cost | Data-entry time saved |
|---|---|---|
| Secure multi-format upload | 4 000 - 8 000 EUR | -10 % (no more emails) |
| OCR + pre-entry | 6 000 - 14 000 EUR | -30 to -45 % |
| eIDAS e-signature | 4 000 - 9 000 EUR | -100 % on paper circuit |
| Automated deadline reminders | 3 000 - 6 000 EUR | -60 % follow-up time |
| Per-file messaging thread | 3 000 - 7 000 EUR | -20 % internal emails |
| Filing-deadline dashboard | 2 500 - 5 000 EUR | visibility, fewer delays |
| Client mobile app | 12 000 - 22 000 EUR | instant photo upload |
A core portal of Upload + OCR + Signature + Reminders lands around 22 000 to 38 000 EUR, with the mobile app as a second phase.
Recurring costs to anticipate
| Item | 2026 order of magnitude |
|---|---|
| Secure hosting + backups | 150 - 450 EUR/month |
| OCR engine (per page or flat) | 0.01 - 0.05 EUR/page |
| eIDAS signatures | 0.50 - 2.50 EUR/signature |
| Maintenance & evolutions | 12-18 % of budget/year |
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Mini case study
Mr. Sombra runs a 12-staff firm in Rennes handling 480 files. Before the portal, every set of accounts required many manual reminders. He invests 31 000 EUR in an Upload + OCR + Signature + Reminders portal. At 6 months, average data-entry time per file drops 42 %, about 25 minutes saved per monthly file. Across 480 files that frees nearly 200 hours a month of collection work, the equivalent of one and a half roles redeployed to billed advisory. The portal pays for itself in a little over a year.
FAQ
Does OCR work on poorly scanned invoices? 2026 engines reach 90 to 97 % recognition on decent documents; doubtful cases go to manual review, still far below full manual entry.
Is e-signature legally valid? Yes, an eIDAS-compliant signature has the same value as a handwritten one; the qualified level carries the strongest presumption of reliability.
Can the portal connect to our production tool? Yes, it feeds Cegid, ACD or MyUnisoft via API or export; budget 6 000 to 14 000 EUR for the connector.
How long to deploy? Expect 8 to 14 weeks for a core portal, with a phased rollout by client group to smooth adoption.
Do clients need training? The client interface targets zero training; we provide a short guide and a guided onboarding on the first upload.
Let's scope your project. Share your file volume, production tool and priority features, and we'll price a portal that pays off in year one. 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.
