The verdict in three sentences
Connecting a payroll engine to an HRIS (leave, time, onboarding) without double entry costs between €9,000 and €40,000 in 2026, depending on flow direction and anomaly handling. Beyond 200 FTEs, the cost per synchronized employee becomes negligible and a custom connector clearly beats a per-task iPaaS. Complexity comes from HR edge cases (final settlements, contract amendments, payroll variables), which add about 15% to the budget but prevent costly payslip errors.
Payroll / HR flow scope
The whole game is mapping precisely what must move between the HRIS and payroll. A poorly scoped flow creates more anomalies than it removes.
| Flow | Direction | Frequency | Complexity |
|---|---|---|---|
| Employee records (new hires) | HRIS → Payroll | On event | Medium |
| Leave & absences | HRIS → Payroll | Daily | High |
| Time & hours | HRIS → Payroll | Weekly | High |
| Payroll variables | HRIS → Payroll | Monthly | High |
| Payslips & statuses | Payroll → HRIS | Monthly | Medium |
| Terminations & settlements | HRIS ↔ Payroll | On event | High |
Daily flows (leave, time) demand robust scheduling and rejection handling — hence the price gap versus a simple monthly export.
One-off build vs iPaaS subscription over 3 years
HR directors often compare a one-time connector against a monthly iPaaS. Over three years, the math favors custom as headcount and flows grow.
| Item | Custom connector | iPaaS subscription |
|---|---|---|
| Initial build | €9,000–40,000 | €0 |
| Annual subscription | — | €3,600–9,600 |
| Monthly support | €300–700 | partly included |
| 12-month total | €13,800–48,400 | €3,600–9,600 |
| 36-month total | €19,800–65,200 | €12,000–31,500 |
| Reversibility | High | Low (lock-in) |
An integration developer's day rate in Toronto runs €500–700 in 2026; a simple one-way connector (€9,000–18,000) often suffices in phase 1, before adding bidirectional flows with anomaly reconciliation (€20,000–40,000).
Mini case study
Marc, HR director of a 380-employee services group in Toronto, ties up 1.5 payroll FTEs at ~€2,400/month loaded just for leave/time re-keying. He commissions a bidirectional connector at €28,000 with anomaly reconciliation and support at €550/month. By automating 70% of entries, he frees roughly 1 FTE (~€1,600/month of value) and cuts payslip errors. The connector amortizes in ~19 months, after which net savings exceed €1,000/month — with no indexed iPaaS subscription.
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FAQ
One-way or bidirectional: which to choose?
One-way (HRIS → payroll) is enough if the HRIS remains the HR source of truth. Bidirectional is needed to push payslips and statuses back, and costs €20,000–40,000 versus €9,000–18,000 for one-way.
How long to implement?
Budget 4–7 weeks depending on flow count and error handling. Testing on a full payroll cycle is essential before go-live.
Why do edge cases cost more?
Final settlements, amendments and payroll variables require specific rules and controls; they add roughly 15% to the budget but avoid manual corrections.
At what headcount is it worth it?
Beyond 200 FTEs, the cost per synchronized employee becomes negligible and custom beats a per-task iPaaS within 24–30 months.
What does connector support cover?
Job monitoring, rejection handling, adaptation to payroll and HRIS updates, and fixes. It runs €300–700/month depending on flows and SLA.
Let's scope your project. Share your headcount, HRIS and priority payroll flows (leave, time, variables), and we'll scope a one-way or bidirectional connector to fit. 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.
