The verdict in three sentences
In a consulting firm, profitability turns on utilisation and rebilling: every unstaffed or mis-billed consultant-day is a straight loss. A generic SaaS HRIS (8-20 EUR/employee/month) handles payroll and leave but rarely fine staffing; a custom module (30,000-70,000 EUR) links engagement planning, time, skills and margin into one control panel. The target: real-time utilisation + automated client rebilling + margin steering per engagement.
Generic SaaS vs custom module in 2026
Compare for a firm of 40 consultants.
| Criterion | SaaS HRIS | Custom module |
|---|---|---|
| Entry cost | Low | 30,000-70,000 EUR |
| Recurring cost | 8-20 EUR/employee/month | 12-18% maintenance/yr |
| Annual cost 40 people | 3,840-9,600 EUR/yr | included in maintenance |
| Staffing / planning | Basic or absent | Core of the module |
| Utilisation rate | Rarely native | Real time |
| Client rebilling | Manual | Automated |
At 40 consultants, SaaS costs 3,840-9,600 EUR/year but leaves staffing on Excel; custom internalises the control that actually drives margin.
Where custom creates value
ROI comes not from licence price but from recovered billable days.
| Lever | Mechanism | 2026 impact |
|---|---|---|
| Engagement planning | Optimised consultant allocation | +3 to 6 pts utilisation |
| Time tracking | Reliable per-engagement entry | -80% missed billing |
| Skills mapping | Right consultant on right engagement | Better margin and satisfaction |
| Automated rebilling | Invoice generated from logged time | Billing 2-4 days earlier |
| Margin steering per engagement | Margin visible in real time | Faster staffing decisions |
A mere 3-point utilisation gain across 40 consultants means dozens of extra billable days per year.
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Mini case study
Sarah runs a consulting firm in New York: 40 consultants, average day rate 850 EUR, 68% utilisation. A custom module at 55,000 EUR (amortised over 3 years + 9,000 EUR/yr) lifts utilisation to 72%, i.e. +4 points. Across 40 consultants and about 210 working days, that is ~336 extra billable days, roughly ~285,000 EUR/year of additional revenue. Payback lands in under 3 months, before counting eliminated billing misses.
FAQ
Isn't a SaaS HRIS enough? For payroll and leave, yes. For fine staffing, utilisation and rebilling, most generic SaaS stay too rigid.
What is the number-one ROI lever? Utilisation: +3 to 6 points on a 40-consultant firm at 850 EUR day rate translates into hundreds of thousands of euros per year.
How long to deploy? Budget 3-6 months for a staffing + time + rebilling module, payroll connection included.
Can we keep payroll in SaaS and connect the rest? Yes, a recommended hybrid: SaaS payroll + custom staffing module linked by API.
How to make time entry reliable? Simple mobile interface, automatic reminders and manager validation: you typically remove 80% of missed billing.
Let's scope your project. Tell us your consultant headcount, average day rate and utilisation: we price SaaS vs custom module with the utilisation ROI. 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.
