The verdict in three sentences
Excel is not free: for a 6-person firm, it costs the equivalent of 24 000-32 000 EUR a year in re-keying, billing errors and the absence of any audit trail. A custom vertical tool at 25 000-38 000 EUR one-off plus 15 % annual maintenance removes double entry and centralises document management. ROI lands around 20 months, after which every year recovers billable time.
The hidden cost of Excel, quantified
The spreadsheet looks free because its cost never lands on an invoice. It lands on the payroll instead: 7 hours a week re-keying between the spreadsheet, the billing tool and the document store, multiplied by a loaded hourly cost of 45-60 EUR, is the real bill. Add 3-4 billing errors a month and the total absence of an access log required under data-protection rules.
| Hidden cost item (Excel) | Volume/year | Estimated annual cost |
|---|---|---|
| Cross-tool re-keying (7 h/wk) | 336 h | 15 100 - 20 200 EUR |
| Fixing billing errors | 40 incidents | 2 400 - 3 200 EUR |
| Document hunting (no DMS) | 90 h | 1 200 - 1 800 EUR |
| Manual monthly reporting | 60 h | 800 - 1 400 EUR |
| Compliance risk (no audit trail) | unprovisioned | exposed |
| Status-quo total | 24 000 - 32 000 EUR/yr |
_2026 order of magnitude, loaded hourly cost 45-60 EUR._
What a custom vertical tool replaces
The goal is not to digitise Excel but to remove the seams between tools. A custom core centralises production, billing, document management and tax-deadline tracking in a single database, with compliant access logging.
| Building block | Custom (one-off) | Measured effect |
|---|---|---|
| Production & client files | 9 000 - 13 000 EUR | no more double entry |
| Billing + auto reminders | 6 000 - 9 000 EUR | -90 % errors |
| Central DMS + search | 5 000 - 8 000 EUR | -80 h/yr searching |
| Deadline dashboard | 3 000 - 5 000 EUR | zero missed deadline |
| Access log (compliance) | 2 000 - 3 000 EUR | provable audit |
| Project total | 25 000 - 38 000 EUR | |
| Annual maintenance (15 %) | 3 750 - 5 700 EUR/yr | fixes + evolutions |
| Compliant hosting | 900 - 1 800 EUR/yr | regional data |
_2026 project estimate, sovereign hosting included._
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Mini case study
Daniel runs a 6-person accounting firm in Singapore. His Excel status quo costs about 28 000 EUR/yr. He invests 31 000 EUR in custom software, plus 4 650 EUR/yr maintenance and 1 400 EUR/yr hosting, i.e. 6 050 EUR/yr recurring. The net annual gain after go-live is 28 000 - 6 050 = 21 950 EUR/yr. Payback on the 31 000 EUR investment lands in 31 000 / 21 950 ≈ 17 months (about 20 months at the lower cost band). Over 5 years the operation frees roughly 78 000 EUR of recovered net value.
FAQ
How much time is really recovered? The main item is re-keying: around 7 h/week, i.e. 336 h/yr, of which 80-90 % is eliminated by a single central database.
Is custom justified against a 40 EUR/month off-the-shelf tool? For a firm with standard processes, a vertical is enough; once you have specific reminders, DMS or connectors, custom pays off beyond 6-8 seats or 25 000 EUR of annual hidden cost.
What compliant hosting budget should I plan? Around 900-1 800 EUR/yr for regional hosting with encryption at rest and an access log.
How long to deliver the software? A production + billing + DMS core deploys in 10-16 weeks, including migration of Excel history.
What happens to maintenance after year one? It stays at 15 % of the one-off, i.e. 3 750-5 700 EUR/yr, covering fixes, regulatory changes and small improvements.
Let's scope your project. Share your headcount, current tools and an indicative budget between 25 000 and 38 000 EUR: we price the software and its 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.
