The verdict in three sentences
A well-designed client portal is a firm's best digital investment: it halves document collection times and cuts emails by 60%. In 2026, budget 20,000 to 45,000 EUR for a custom branded portal, or 8 to 20 EUR/client/month for a vendor module. Custom wins as soon as the portal becomes a sales argument rather than a mere utility.
What makes up an accounting client portal
A serious portal is more than an upload space: it combines strong authentication, DMS, e-signature and integration with your production tool.
| Feature | Role | Typical 2026 cost |
|---|---|---|
| Strong authentication (MFA) | Secure access | Included in build |
| Guided document upload | Collect error-free | Included in build |
| Auto-classified DMS | Find fast | Included in build |
| E-signature | Approve remotely | 0.5-2 EUR/signature |
| Accounting tool integration | Avoid re-entry | 5,000-12,000 EUR |
| Auto notifications/chasing | Speed collection | Included in build |
Custom or vendor module: 2026 prices
Here are the orders of magnitude for a 150-400 client firm (estimate, 2026).
| Item | Vendor module | Custom portal |
|---|---|---|
| Cost per client/month | 8-20 EUR | — |
| 200 clients / year | 19,200-48,000 EUR | — |
| Initial development | 0 EUR | 20,000-45,000 EUR |
| Hosting + maintenance/year | Included | 4,000-9,000 EUR |
| E-signature | 0.5-2 EUR/sig. | 0.5-2 EUR/sig. |
| Brand and UX | Vendor standard | 100% yours |
| 3-year total (200 clients) | 57,600-144,000 EUR | 32,000-72,000 EUR |
Beyond 150 clients, custom often becomes cheaper over 3 years than a per-client module, while offering an on-brand experience.
Mini case study
Ms Fabre, partner of a 240-client firm in Bristol, is considering a vendor module at 14 EUR/client/month, i.e. 40,320 EUR/year. Over 3 years: 120,960 EUR. A custom portal at 38,000 EUR + 7,000 EUR/year hosting-maintenance costs 59,000 EUR over 3 years, i.e. 61,960 EUR saved. On top of that, document collection drops from 12 to 6 days on average, advancing production and improving cash flow during tax season.
FAQ
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Is a custom portal really more secure?
It is as secure as a serious vendor, provided you require MFA, encryption, EU hosting and logging in the spec. Security depends on requirements, not the model.
How much does e-signature cost?
Budget 0.5 to 2 EUR per signature depending on level (simple, advanced, qualified), billed per use, whether the portal is custom or not.
How long to deliver a client portal?
A useful custom portal ships in 2 to 4 months: upload, DMS, notifications first, then signature and integrations.
Does the portal connect to my production tool?
Yes, via API or connector: uploaded documents are classified and feed production without re-entry, which is the biggest time gain.
From how many clients is custom worthwhile?
Usually beyond 150 clients, where a vendor's per-client cost exceeds the amortization of a build over 3 years.
Let's scope your project. Tell us your client count, your accounting tool and your signature needs; we will price a branded portal with an indicative budget. 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.
