Multi-country payroll migrations usually drag on for lack of method, not for lack of goodwill. Here is the outline we follow with our clients to close a multi-entity migration within 8 calendar weeks, without compromising reliability.
Week 1 — Scoping and inventory
Everything starts with a scoping workshop per entity: list the applicable collective agreements, local specifics (bonuses, specific leave types, sector allowances), and identify the source of truth for each payroll variable. A simple rule to apply from this stage: if a piece of data lives in several spreadsheets at once, that's a risk to fix before the migration, not after.
Weeks 2-3 — Configuration and testing
While payroll parameters (rates, caps, agreements) are being configured, the local HR team prepares a test payroll run on the last closed month. It's compared line by line against the old system: any significant gap is investigated before moving on. No cutover without a clean reconciliation.
Week 4 — Employee data cutover
This is the most sensitive step: bulk import of employees from the old system, with field-by-field validation of critical data (employee ID, bank details, family situation, tax rate). The old system stays accessible as a mirror during the transition — access is never cut overnight.
Weeks 5-6 — Double run
Both payrolls run in parallel. Discrepancies are analysed and configuration adjusted as needed. This phase reassures every stakeholder — finance, HR, auditors — before the old system is switched off.
Week 7 — Training
- Dedicated sessions for payroll administrators on the new tool.
- A short session for managers, focused on validating variables.
- Simple communication for employees: app access, reading a payslip.
- Local documentation, adapted to the country's specifics.
Week 8 — Go-live
Payroll runs in production on the new system. The old one stays accessible read-only for as long as legal archiving requires. Reinforced support is kept up for the first few weeks to absorb questions from the field.
Mistakes to avoid
- Trying to digitise everything at once — move country by country, or entity by entity.
- Underestimating the quality of your current employee data: it's often the real cause of project delays.
- Switching off the old system too soon — keep read access during the stabilisation phase.
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