Four Major Social Insurances · Enrollment and Reporting
Four Major Social Insurances
What are the four major social insurances?
- National Pension, Health Insurance, Employment Insurance, and Industrial Accident Insurance
- Late reporting and under-reported pay are the biggest risks
- Rates and criteria change every year, so check the latest notices
What the four major insurances really change for a company is not 'enrollment' but 'reporting.' Three things have to line up: the start date in the employment contract, the monthly pay on the payroll ledger, and the enrollment date and monthly remuneration reported to the insurance agencies. If even one is off, the gap doesn't go away. It comes back months later as a settlement adjustment. That means the moment you confirm a hire, pay design and reporting design begin together. If a salary negotiation covers only the pre-tax amount and never explains the deductions, complaints almost always arrive on the first payday. In practice, the most reliable approach is to prepare the enrollment report data on the same day you receive the new hire's paperwork.
The four insurances are often spoken of as one package, but each has its own administrator and its own rules. The National Health Insurance Service bills and collects premiums for all four in a single notice, yet eligibility and benefits are handled separately by the National Pension Service, the National Health Insurance Service, and the Korea Workers’ Compensation & Welfare Service. The standard deadline for acquisition and loss reports is the 15th of the month following the month in which the event occurred, and daily workers are handled through a separate procedure called the work details report. What counts as remuneration is also a common source of confusion: meal allowances and self-driving allowances that are tax-exempt under the Income Tax Act are excluded, but regular bonuses and most allowances are included in remuneration. Whether an insurance applies can also differ for part-time workers under 60 hours a month, CEOs, and cohabiting relatives, so handling a new hire as 'one more person, same treatment for all four' is risky.
Two misunderstandings cause the most trouble in practice: 'we can enroll them after probation ends' and 'daily workers aren’t covered.' An employee on probation is covered from day one, and filing a late retroactive enrollment report can leave the company paying even the employee’s share for someone who has already left. Daily workers must in principle also be reported for employment and industrial accident insurance, so if you leave them out, the omission surfaces the moment that worker applies for unemployment benefits or an industrial accident claim. In particular, if an accident happens while the employer is not enrolled in industrial accident insurance, the worker is still paid, but part of that amount is recovered from the employer. Premium rates and upper and lower limits change every year, so always check the agency notices for the relevant year when calculating.
Kyungtae KimHR expert · Organizational culture and HR strategy consultant
Inwoo LeeLeadership, communication, and performance management expertKorea’s social insurance system took shape as industrial accident compensation, health insurance, the national pension, and employment insurance were introduced in turn, and each law sets out the employer’s duties to report eligibility and pay premiums.
Company A is a 42-employee firm that builds out commercial interiors, with around 30 daily workers on site each month. For almost two years, it had reported on-site staff’s monthly remuneration based only on a KRW 2.2 million (≈ US$1,650) base salary, leaving out night and holiday pay and quarterly bonuses. In April 2024, the year-end health insurance settlement notice showed an additional premium of KRW 17.8 million (≈ US$13,300) all at once, and the finance manager went straight to the HR team. (Hypothetical example)
- When the HR head compared the last 24 months of payroll records against the agency filings line by line, it turned out that for 19 on-site employees, actual average monthly remuneration was KRW 610,000 (≈ US$455) higher than the reported amount.
- At a meeting with the company’s labor attorney, the administration manager said, 'I heard bonuses are irregular, so we can leave them out.' The attorney was clear: bonuses with a fixed annual payment count as remuneration.
- With the CEO’s sign-off, the company filed the overdue monthly pay change reports for all 19 employees in one batch, and applied to the insurance agency for an installment plan to spread the additional KRW 17.8 million (≈ US$13,300) bill over six months.
- To make sure the daily-worker work-details report goes out by the 15th of each month, the company changed its internal rules: it moved the payroll cutoff from the 25th to the 10th, and site managers now hand in the daily attendance log by that date.
- The following April, the additional health insurance settlement fell from KRW 17.8 million (≈ US$13,300) to KRW 2.1 (≈ US$1) million, and missed enrollment reports for new hires dropped from 7 a year to 0.