Why Flex?
- Native 4-insurance / 연말정산 / withholding
- Encrypted 주민번호 storage (legally required)
- Automatic Korean pay-slip issuance
- Electronic employment contracts
- KRW billing
Core principle
Keep BambooHR as a global org dashboard; process the Korean entity in Flex. **Cannot unify into one tool** — legal structures differ.
Migration (3–4 weeks)
Week 1 - Flex account + Korean entity registration - Export Korean employees from BambooHR - Organize 주민번호 / bank accounts / employment contract data
Week 2 - Import employee info into Flex - Integrate 4-insurance EDI - Issue electronic employment contracts (replacing existing) - Configure pay items and deductions
Week 3 - First payroll run - Verify withholding auto-calc - Issue pay slips - Onboard employees to Flex portal
Week 4 - Keep Korean data in BambooHR as read-only (audit) - Continue BambooHR as global dashboard - Flex is the Korean local source of truth
연말정산 season caution
If your migration window overlaps Nov–Feb, adjust the schedule. 연말정산 should be fully handled in Flex so employee self-entry and Hometax submission flow naturally.
Pitfalls
- Sharing CSV with plaintext 주민번호: legal violation
- Running payroll in both systems simultaneously: duplication/error risk. Fix the Flex cutover date
- Forgetting to reissue electronic contracts: legal validity issue