The verdict in three sentences
A custom approval workflow with e-signature costs between EUR 15,000 and 40,000 excl. VAT in Amsterdam in 2026, plus EUR 1 to 3 per envelope at the signature provider. For a group handling 400 spending commitments a month, it cuts average approval time from 6 days to 1 day and replaces email threads with an audit trail auditors can actually use. The budget depends mostly on the number of approval rules and ERP connections, not on the signature itself.
Approval routing by amount
The value of the workflow lies in the rules: who approves what, above which threshold, with what delay before a reminder. Here is a typical matrix for a distribution group with 300 to 800 employees.
| Commitment amount | Approval levels | Signature type | Target time |
|---|---|---|---|
| Under EUR 1,500 | Line manager | Simple in-app approval | 4 hours |
| EUR 1,500 to 10,000 | Manager + financial control | Simple approval + timestamp | 1 day |
| EUR 10,000 to 50,000 | Manager + controller + CFO | Simple electronic signature (SES) | 1 day |
| EUR 50,000 to 200,000 | + CEO | Advanced electronic signature (AES) | 2 days |
| Over EUR 200,000 | + Executive committee | Advanced signature, dual signing | 5 days |
| Off-budget commitment | Exception route + CFO | Advanced signature + mandatory comment | 2 days |
In practice, 80 % of commitments fall under EUR 10,000 and need no billed e-signature: a timestamped, logged in-app approval is enough. That sharply reduces the signature bill.
What the project costs
| Item | Simple workflow | Integrated workflow | Full workflow |
|---|---|---|---|
| Commitment forms and amount-based routing | EUR 8,000 | EUR 12,000 | EUR 16,000 |
| Signature integration (Yousign, Docusign, ValidSign) | EUR 3,000 | EUR 4,000 | EUR 5,000 |
| ERP connection (budgets, suppliers, purchase orders) | CSV import, EUR 1,500 | API, EUR 6,000 | Two-way API, EUR 10,000 |
| Reminders, delegations, absences | EUR 1,500 | EUR 3,000 | EUR 4,000 |
| Audit trail and auditor exports | EUR 1,000 | EUR 2,000 | EUR 3,000 |
| SSO and per-entity permissions | Basic, included | EUR 1,000 | EUR 2,000 |
| Total (excl. VAT) | EUR 15,000 | EUR 28,000 | EUR 40,000 |
| Timeline | 6 weeks | 10 weeks | 14 weeks |
On the signature side, API plans from eIDAS-qualified European providers run EUR 1 to 3 per envelope depending on volume and level (simple or advanced), with a monthly subscription of EUR 50 to 300.
Mini case study
Sanne, CFO of a 450-employee distribution group in Amsterdam, handles 400 spending commitments a month approved by email. Average approval time is 6 days, 15 % of commitments get chased twice, and the auditors spend 3 days a year rebuilding approval history.
- Investment: integrated workflow at EUR 28,000.
- Signature: 80 commitments a month above EUR 10,000 at EUR 2 per envelope, plus EUR 100 subscription, i.e. EUR 260 per month.
- Time gain: 400 commitments × 20 minutes of chasing and inbox searching avoided = 133 hours a month, valued at EUR 45, i.e. EUR 5,985.
- Supplier gain: on-time approvals unlock a 1 % early-payment discount on EUR 150,000 of monthly purchases, i.e. EUR 1,500.
Estimated net monthly gain: 5,985 + 1,500 - 260 = EUR 7,225. Payback: about 4 months, a 2026 order of magnitude.
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FAQ
Is a simple electronic signature legally valid?
Yes, the eIDAS regulation recognises its evidential value. For commitments above EUR 50,000, an advanced signature strengthens the proof for EUR 1 to 2 more per envelope.
Why not just use an off-the-shelf approval tool?
You can, for EUR 15 to 30 per user per month. Custom becomes worthwhile when rules by amount, entity and budget exceed what the standard tool can configure, or beyond 100 approvers.
How are approver absences handled?
Through dated delegation and automatic escalation after 24 or 48 hours. This module costs EUR 1,500 to 4,000 and removes most bottlenecks.
Will the audit trail satisfy our auditors?
Yes, if it records the author, timestamp, amount and document version at each step, exportable to CSV or PDF. Audit firms typically cut review time by 50 %.
How long to get started?
6 to 14 weeks depending on configuration, with a 2-week pilot on one entity before rollout.
Let's scope your project. Send us your monthly commitment volume, approval thresholds and ERP, and we will price the workflow and e-signature with an entity-by-entity rollout plan. 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.
