The verdict in three sentences
Linking payroll to an HR portal automates the feed of variables (hours, absences, bonuses) and makes payslips reliable. Budget 6,000 to 20,000 EUR (excl. tax) depending on the target HRIS and sync direction. Since HR data is sensitive, GDPR compliance (minimization, encryption, traceability) is an integral part of the estimate.
What it costs in 2026
Price depends on the payroll software (Silae, PayFit, Sage Paie, ADP), the number of employees and the granularity of synced variables.
| Integration scope | Timeline | 2026 cost (EUR excl. tax) | Maintenance/year |
|---|---|---|---|
| Simple feed (absences + leave) | 3 weeks | 6,000 - 9,000 | 600 - 900 |
| Standard (full payroll variables) | 4 weeks | 9,000 - 14,000 | 900 - 1,400 |
| Advanced (bidirectional + expenses) | 6 weeks | 14,000 - 18,000 | 1,400 - 1,800 |
| Full (multi-agreement + reporting) | 7 weeks | 18,000 - 20,000+ | 1,800 - 2,000 |
2026 orders of magnitude, excluding HRIS API licences and any digital payslip vault module.
GDPR and HR data: the requirements
A payroll sync handles sensitive personal data. Compliance is not optional and shapes the technical architecture.
| GDPR requirement | Technical translation | Project impact |
|---|---|---|
| Data minimization | Sync only what is needed | Strict field mapping |
| Security / confidentiality | Encryption in transit and at rest | Dev cost +5 to 10% |
| Access traceability | Logging of consultations | Log module |
| Retention period | Automatic purge | Archiving rules |
| Employee access right | Self-service portal | Dedicated feature |
Mini case study
Nadia, HR director of a 180-employee services group in Toulouse, collects payroll variables via email and Excel: about 16 h/month of entry at 38 EUR/h, i.e. 608 EUR/month, with an error rate estimated at 4% of payslips (7 corrections/month). A standard integration at 12,000 EUR (excl. tax) with Silae automates the feed and drops errors by 75%. Gain: about 456 EUR/month in time, plus fewer adjustments; payback is about 22 months on time alone, faster once disputes decline.
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FAQ
Which payroll software is supported?
The main ones: Silae, PayFit, Sage Paie, ADP, Cegid. Cost depends on their API quality; some require file exports, which adds middleware to the budget.
Is the sync GDPR-compliant?
Yes, it is a pillar of the project: field minimization, encryption, access logging and automatic purge. These requirements represent about 5 to 10% of the development budget.
Do you need bidirectional sync?
Not always. A simple feed (portal to payroll) is often enough. Bidirectional (payroll to portal for payslips) costs more but gives employees true self-service.
How long to set up?
From 3 to 7 weeks depending on scope, acceptance testing included. Test access to the HRIS and an anonymized dataset noticeably speed up the project.
Let's scope your project. Tell us your payroll software (Silae, PayFit, Sage), the number of employees and the variables to sync, and we will frame a GDPR-compliant integration. 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.
