The verdict in three sentences
A high-performing accounting firm cannot be run from a spreadsheet: it needs a practice management tool that centralises client files, tax deadlines, document management and time tracking. In 2026, custom software costs 25,000 to 70,000 EUR (3 to 6 months of development), versus 30 to 80 EUR/employee/month for an off-the-shelf SaaS. The real return is measured in tax penalties avoided and 5 to 10 hours/employee/month freed from administrative tasks.
Custom or SaaS: what you actually pay
Production software (Cegid, ACD, Sage) handles data entry and filings but poorly covers cross-firm management. That is where a dedicated tool — SaaS or custom — takes over. Here are the 2026 orders of magnitude.
| Item | SaaS practice tool | Custom Kolonell |
|---|---|---|
| Entry cost | 0 to 3,000 EUR | 25,000 to 70,000 EUR |
| Monthly cost | 30 to 80 EUR/employee | Hosting 80 to 300 EUR/month |
| 12-person firm/year | 4,320 to 11,520 EUR | ~2,000 EUR (hosting) |
| Workflow customisation | Limited | Total |
| Code ownership | No | Yes |
| Time to go live | 2 to 6 weeks | 3 to 6 months |
Over three years, a 12-employee firm pays 13,000 to 34,500 EUR for pure SaaS. Custom software becomes worthwhile once the firm exceeds about fifteen employees or needs specific automations that SaaS charges as add-ons.
The modules that pay off
Not all modules are equal. Here are those with the most direct financial impact, with a 2026 gain estimate.
| Module | Measurable gain | Annual estimate (12-person firm) |
|---|---|---|
| Automated tax deadline tracking | Penalties avoided | 3,000 to 8,000 EUR |
| Indexed document management + full-text search | 3 h/month/employee | ~430 h/year |
| Time entry + profitability per file | +5 margin points | 8,000 to 20,000 EUR |
| Client portal (document upload) | -40% follow-ups | ~150 h/year |
| Partner dashboard | Faster decisions | Strategic, not quantifiable |
The deadline module is almost always the one that justifies the project on its own: a single VAT or filing penalty avoided for a sensitive client covers several months of subscription.
Mini case study
Marc, a partner in a 12-employee firm in Nantes, juggled Excel, Outlook and his production software to track 340 files. Three missed deadlines in 2025 cost him 2,400 EUR in penalties rebilled as a goodwill gesture, plus the trust of two clients.
He invests 38,000 EUR in a custom tool: deadline tracking, document management and time entry. Result over 12 months: 7 h/month/employee saved, i.e. ~1,000 h/year valued at 45 EUR = 45,000 EUR of recovered capacity, and zero missed deadlines. The project pays for itself in under a year, including 180 EUR/month of hosting.
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FAQ
How much does custom practice management software really cost?
In 2026, expect 25,000 to 70,000 EUR depending on the number of modules (deadlines, document management, time, client portal). A first useful scope starts around 25,000 EUR.
Does custom software replace my Cegid or ACD production software?
No, it complements it. It connects via API or import to manage files, deadlines and profitability, where production handles data entry and filings.
How much time does my team save?
Between 5 and 10 hours per employee per month on administration: document search, client follow-ups, manual deadline tracking. For 12 people, that is ~1,000 h/year.
Is the document management compliant with professional secrecy?
Yes: encryption at rest, access logging and fine-grained rights per file. RGPD compliance and traceability are built in from the design stage.
How long does the project take to deliver?
Expect 3 to 6 months depending on scope, with a first useful version (deadlines + document management) deliverable in 8 to 10 weeks.
Let's scope your project. Tell us about your firm (headcount, current production software, priority modules) and your 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.
