The verdict in three sentences
A good requirements spec halves the overrun risk of practice software: it turns a vague need into arbitrable requirements. In 2026, a full project (production, DMS, billing, ledger/tax connectors, GDPR) lands between 50,000 and 130,000 EUR. The golden rule: rank each requirement by criticality to know where to invest and where to drop.
Requirements template by domain
A useful spec lists requirements, their criticality and budget impact. Here is a 2026 template for an accounting firm.
| Domain | Key requirement | Criticality | Indicative cost (EUR) |
|---|---|---|---|
| Production | Schedule, workload, time | High | 14,000 - 28,000 |
| DMS | Filing, search, versions | High | 10,000 - 20,000 |
| Billing | Fees, recurring, follow-ups | High | 10,000 - 20,000 |
| Connectors | Ledger, tax, bank | High | 10,000 - 25,000 |
| Client portal | Upload, signature, messaging | Medium | 15,000 - 40,000 |
| Reporting | Partner dashboards | Medium | 8,000 - 16,000 |
| GDPR & security | EU hosting, logs, MFA | High | 6,000 - 14,000 |
High-criticality domains form the non-negotiable base. Medium domains can ship in phase 2 to spread the budget.
Arbitrating: vendor and timelines
The spec also lets you compare vendors on common ground: day rate, timelines, reversibility.
| Selection criterion | 2026 range | To verify |
|---|---|---|
| Onshore day rate | 400 - 650 EUR | Seniority, firm references |
| Outsourced day rate | 350 - 600 EUR | Time zone, communication |
| Full project timeline | 12-20 weeks | Intermediate deliveries |
| Code ownership | Full required | Contract clause |
| Data reversibility | Full export | Documented format |
| Post-launch support | 1,200 - 2,500 EUR/month | SLA, fix times |
Requiring intermediate deliveries every 2-3 weeks lets you validate continuously and avoid the tunnel effect.
Mini case study
Mr. Laurent, director of a 30-person firm, writes a spec prioritizing the base (production, DMS, billing, ledger/tax connectors, GDPR) for a target budget of 85,000 EUR, with the client portal deferred to phase 2. Thanks to criticality ranking, he receives three comparable quotes between 78,000 and 96,000 EUR instead of the 1-to-3 spread seen without scoping. Savings on uncertainty: about 20,000 EUR and 4 weeks of negotiation avoided.
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FAQ
Why write a spec before consulting vendors?
Because it turns a vague need into comparable requirements. Without it, quotes vary threefold and budget overrun risk explodes.
What does full practice software cost in 2026?
Between 50,000 and 130,000 EUR for a full scope (production, DMS, billing, connectors, GDPR). The priority base alone stays around 50,000-85,000 EUR.
What is a ledger/tax connector and why is it critical?
It is the interface that exports the accounting ledger file and communicates with the tax administration. It is essential for compliance and always ranks high-criticality.
Can we outsource the development?
Yes, at a 350-600 EUR day rate. The spec must then be very precise on GDPR requirements, code ownership and data reversibility.
How to avoid the tunnel effect on a 12-20 week project?
By requiring intermediate deliveries every 2-3 weeks and validating each brick before the next, with a budget split by phase.
Let's scope your project. Send us your priority requirements and target budget, and we will help structure your spec and price each phase. 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.
