The verdict in three sentences
An accounting firm's nightmare is not production: it is collecting the records via email, messaging and USB sticks. A secure client area with a document vault centralizes record upload, statement sharing, electronic signature and notifications — a 2026 budget of 22,000 to 55,000 EUR excl. VAT over 10 to 16 weeks, GDPR-compliant and EU-hosted. The measured gain: 6 to 9 hours recovered per week on collection alone.
Cost per function in 2026
The client area is built function by function. Start with secure upload and notifications, then add signature and the payroll portal.
| Function | Scope | 2026 cost (EUR excl. VAT) | Timeline |
|---|---|---|---|
| Core + authentication | Client accounts, roles, EU hosting | 5,000 – 10,000 | 2 – 3 wks |
| Upload / vault | Record upload, filing, vault | 5,000 – 11,000 | 3 – 4 wks |
| Electronic signature | Statements, engagement letters, minutes | 4,000 – 9,000 | 2 – 3 wks |
| Notifications / reminders | Missing-record reminders | 2,000 – 5,000 | 1 – 2 wks |
| Statement sharing | Secure distribution, history | 3,000 – 7,000 | 2 – 3 wks |
| Payroll portal | Payslips, employee vault | 4,000 – 10,000 | 2 – 4 wks |
The total reaches 23,000 to 52,000 EUR excl. VAT, consistent with the range. Automatic missing-record reminders are the best cost/benefit ratio: they remove the manual chasing of clients.
Vendor module or custom build?
Accounting software vendors offer an integrated client portal. Convenient, but limited to their ecosystem and billed per file.
| Criterion | Custom area | Vendor module |
|---|---|---|
| Upfront cost | 22,000 – 55,000 EUR | Included / option |
| Recurring cost | Hosting 120 – 350 EUR/mo | Per file / user |
| 250 client files | ≈ 3,000 EUR/year | Often 6,000 – 15,000 EUR/year |
| UX customization | Full, firm-branded | Limited |
| Electronic signature | Built in, no per-act fee | Sometimes billed per act |
| Software independence | Yes | Tied to vendor |
For a firm with 250 files, the vendor module can cost 6,000 to 15,000 EUR/year. A custom build amortizes its upfront cost in 3 to 5 years while carrying the firm's brand and avoiding vendor lock-in.
Mini case study
Me Diop, partner at an accounting firm (250 files, 6 staff) finds that record collection consumes 8 hours/week of staff time (chasing, sorting, entry) at a loaded cost of ≈ 30 EUR/hour, i.e. 240 EUR/week or ≈ 12,500 EUR/year.
He invests 38,000 EUR excl. VAT in a client area (vault + signature + reminders + statement sharing) delivered in 14 weeks. Automatic reminders and self-service upload recover 7 hours/week (≈ 10,900 EUR/year) and shorten production times. Payback: ≈ 30 months, before counting faster signatures and client satisfaction.
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FAQ
Is the client area GDPR-compliant?
Yes: EU hosting, encryption, consent management and retention periods. This is essential for sensitive accounting and payroll records.
Is electronic signature valid for an engagement letter?
Yes, an eIDAS-compliant signature is legally binding for engagement letters, statements and minutes. Budget 4,000 to 9,000 EUR excl. VAT.
Can we keep our current accounting software?
Yes, the custom area connects alongside your accounting production; it does not replace your entry tool but smooths the client relationship.
How long to deploy?
10 to 16 weeks for a vault + signature + reminders scope. An "upload + reminders" MVP can ship in 6 weeks.
What maintenance budget?
Around 10% of build cost per year, i.e. 2,200 to 5,500 EUR excl. VAT, for security, updates and support to the firm's clients.
Let's scope your project. Tell us your number of files, your priority functions (vault, signature, payroll portal) and your accounting software, and we will frame scope and 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.
