The verdict in three sentences
A consulting firm loses margin not on day rates but on a poorly steered utilisation rate and unbilled work. A custom system at 25,000-70,000 EUR excl. tax linking staffing, timesheets and margin per engagement typically adds 8 to 12 margin points in the first year. ROI is measured in weeks once the firm passes 15 consultants.
The modules of an engagement management tool
The core of such software is not billing but real-time visibility into profitability. 2026 order of magnitude per module.
| Module | What it steers | 2026 estimate (EUR excl. tax) |
|---|---|---|
| Staffing & workload plan | Assignment, utilisation rate | 6,000-14,000 |
| Timesheets | Mobile entry, approval | 4,000-9,000 |
| Margin per engagement | Loaded cost vs billed | 5,000-12,000 |
| Billing & T&M/fixed-fee | Milestones, day rates, credits | 5,000-11,000 |
| CRM & pipeline | Opportunities, forecast | 4,000-9,000 |
| Partner reporting | Profitability dashboards | 3,000-7,000 |
SaaS PSA vs custom: what to choose in 2026?
Off-the-shelf PSA (Professional Services Automation) tools cover the standard; custom fits your staffing model and margin rules.
| Criterion | SaaS PSA | Custom |
|---|---|---|
| Upfront cost | 0-6,000 EUR | 25,000-70,000 EUR excl. tax |
| Annual cost | 30-80 EUR/user/month | Maintenance 4,000-11,000 EUR |
| Timeline | 4-10 weeks | 3-6 months |
| Margin rules | Standard | Your exact formulas |
| Multi-office staffing | Offer-dependent | Custom |
| Integrations (accounting, payroll) | Limited connectors | Unlimited |
| Scalability | Vendor roadmap | Yours |
Mini case study
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Helene, partner of a 22-consultant firm in Lyon, bills an average day rate of 950 EUR but estimates utilisation at 68% with no fine visibility. A custom system at 52,000 EUR excl. tax gives her the real-time workload plan and lifts utilisation to 74% within a year. Across 22 consultants x 210 billable days x 6 points x 950 EUR, the gross potential upside approaches 263,000 EUR/year in extra revenue; even capturing just a third, the tool pays back in under 3 months. Net margin rises about 10 points by chasing under-billed engagements.
FAQ
Why not stay on Excel? Excel gives neither real-time utilisation nor alerts on engagements going off track; the hidden cost is unbilled days that are never detected.
Isn't a SaaS PSA enough? It is enough while your staffing model and margin rules are standard; once you have multiple offices or specific revenue sharing, custom becomes relevant.
How long to deploy? Plan 3 to 6 months, with timesheets and staffing delivered first to capture value quickly.
What margin gain to expect? Order of magnitude: 8 to 12 points, mainly by improving utilisation and billing overruns currently absorbed.
Can it connect accounting and payroll? Yes, bridges to your accounting software and payroll are priced separately (3,000-8,000 EUR) and eliminate double entry.
Let's scope your project. Tell us your consultant headcount, priorities (staffing, margin per engagement, timesheets) and an indicative budget to frame the tool. 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.
