📂HR & Labor⏱3 min read📊Practical🔗10 related

What is the retirement benefit system?

In one line
Pay an employee receives when leaving after a certain period of continuous service. Employers must set up a severance pay system, a retirement pension plan, or both.
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⚡ Summary in 3 lines
  • Based on 30 days of average wage per year of service
  • The key issue is whether periods of continuous service are combined
  • Interim settlement is limited to statutory reasons

Severance pay is calculated on the day an employee leaves, but the amount is determined by the records built up since the hire date. The hire date in the employment contract, the items listed in the wage ledger, and how leaves of absence and transfers were handled all feed directly into the period of continuous service and the average wage. So setting up a retirement benefit system is less about writing one line in the rules than about keeping HR records in a form that can withstand verification at the time of departure. In practice, what matters is whether the payroll administrator can open the file on the employee’s last day and arrive at a number without dispute.

Cases first diverge on coverage. Employees who work fewer than 15 hours per week on average over four weeks, and those with less than one year of continuous service, are excluded. But if a three-month contract has been renewed four times and passes one year, the employee is covered. The calculation basis is 30 days of average wage × years of continuous service, and the average wage is the total wages for the three months before departure divided by the total days in that period. Items paid on an annual basis, such as annual leave allowance or regular bonuses, are included only at the prescribed proportion, and if the average wage is lower than the ordinary wage, the ordinary wage is treated as the average wage. Payment is due 14 days after departure, and an extension is possible only by agreement of the parties.

The cost structure also differs by plan type. Under a defined benefit (DB) plan, the company is responsible for the benefit level based on the average wage at retirement. Under a defined contribution (DC) plan, the company pays in at least one-twelfth of annual total wages each year, so the way wage increases flow into the company’s cost differs between the two. Interim settlement is allowed only for reasons listed in law, such as a first-time home purchase, a lease deposit burden, medical care of 6 months or more for the employee or a dependent, bankruptcy or personal rehabilitation, or introducing a wage peak system. An interim settlement made without checking the reason is not recognized as a settlement, so you may have to recalculate and pay again for that period.

The most common mistake in practice is trusting form over substance. Some companies assume that tenure resets if they accept a resignation letter and rehire the person a few days later, but if the job duties and reporting lines continue unchanged, the periods are added together based on substance, not form. Split-payment arrangements, in which severance is added to monthly pay, are also generally void, so the company may have to pay severance again on top of what it has already paid. Payment more than 14 days late incurs late-payment interest of 20% per year for the overdue days, and nonpayment itself is a criminal offense, so it is safest to document the calculation basis as soon as notice of resignation is received. Detailed requirements and figures may be amended, so have a specialist review any large settlement.

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💡 In plain English
It works like settling a maturing savings plan: if the enrollment period or interest rate was set wrong, the problem only surfaces on the maturity date.
Why it matters in practice
Severance disputes start only after the calculation is done. Most errors come from two things: the continuous service period and the average wage.
🧮 Formula
Severance pay = average daily wage × 30 days × (continuous service period ÷ 365)
With a daily average wage of KRW 130,000 (≈ US$97) and 5 years of continuous service, the base amount is 130,000 × 30 × 5 = KRW 19.5 million (≈ US$14,600).
Origin and sources

The Employee Retirement Benefit Security Act requires employers to set up at least one of a severance pay system or a retirement pension system, and provides that severance pay must be at least 30 days of average wage for each year of continuous service.

Source · Employee Retirement Benefit Security Act
An example

This is the case of Company A, an auto parts manufacturer with 140 employees and KRW 32 billion (≈ US$23,941,300) in annual revenue. For 5 years it had signed 22 production-line contract workers to 11-month terms, left a one-month gap, and then re-signed them. The problem surfaced when 3 departing workers filed a complaint with the labor office, saying 'pay us severance for 4 years of service.' (hypothetical example)

  1. The HR director cross-checked five years of contracts against access logs and found that 18 days of the supposed one-month gap showed the employee actually working on the same line. The conclusion: this was a renewal, not a break in service.
  2. In the labor law firm’s review, the three complainants’ continuous service came to 3 years 10 months, 4 years 2 months, and 4 years 7 months, and the estimated unpaid amount worked out to roughly KRW 9 million (≈ US$6,730) per person.
  3. When the payroll manager recalculated the average wage to include annual leave allowance and 3/12 of the regular bonus of 400% per year, average severance pay per employee rose 11.4% from the first calculation.
  4. The CEO asked, 'Don't the other 19 have the same problem?' The company retroactively recognized the tenure of all its contract workers, enrolled them in a DC retirement pension, and restructured to pay contributions every month.
  5. The three complaints were withdrawn by agreement, and the total of KRW 28.7 million (≈ US$21,500) was settled within the 14-day deadline. The following year, the 7 departing employees raised zero objections, and processing time dropped from 3 hours to 40 minutes per case.
Related terms
Average WageThe total wages paid over a set period before the triggering event, divided by the total number of days in that period. It is the basis for calculating severance pay, accident compensation, and similar benefits.Retirement Pension DB · DC · IRPA system that accumulates and manages retirement benefits with an outside financial institution. It comes in three types: Defined Benefit (DB), where the benefit is fixed; Defined Contribution (DC), where the contribution is fixed; and the Individual Retirement Pension (IRP).Wage Arrears · Complaints and RemediesThe state in which wages, severance pay, and the like have not been paid by the due date. Employees can seek relief through a complaint, criminal charges, or a civil claim.Retirement Age · Continued EmploymentA system under which the employment relationship ends when an employee reaches a set age. The law requires the retirement age to be set at 60 or older.Requested Resignation · Mutual-Agreement SeparationA way of ending employment in which the employer urges the employee to leave and the employee accepts. It takes the form of an agreement, but in substance it may be judged a dismissal.Wage Claim Guarantee · Substitute PaymentA system in which the state pays a set range of wages and severance pay on an employer’s behalf when the employer cannot pay, then claims the amount back from the employer.Retirement Pension Participant TrainingStatutory training under the Employee Retirement Benefit Security Act. Employers that have set up a retirement pension must inform participants every year about how the plan is run and how plan assets are managed.Year-End Tax Settlement · WithholdingThe procedure in which, after the year ends, earned income tax that the company withheld from monthly pay is recalculated using actual deductions, and the difference is refunded or collected.Executive Severance Rules · Executive Severance Policy and Shareholder ApprovalA system that pays severance to registered officers, who are not employees, under rules set in the articles of incorporation or by shareholder resolution. The statutory severance system does not apply to them, so without such rules there is no basis for payment, and amounts above the tax-law limit are treated as earned income rather than retirement income.Offboarding · Handover and Settlement After the Exit InterviewThe full process that runs from the point a resignation is confirmed through the last working day and beyond: handover, account retrieval, issuing documents, and settling pay and severance. If the exit interview is where you hear why someone is leaving, offboarding is where you handle what stays and what gets shut off.
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📚Reemployment Strategy for Mid-Career and Senior WorkersNanum Consulting corporate training · In-person/OnlineSee course →
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Last updated 13 Sep 2026 · Reviewed by John Kim

FAQ

The law sets eligibility requirements for the continuous service period. Check the latest statutes for the requirements and exceptions.
A formal resignation and rehire alone may not be recognized as a break in service. If the employment relationship effectively continued, the periods may have to be combined, so take care.
Interim settlement is limited to the cases set out by law. If you have been settling it as routine practice without meeting those requirements, its validity and possible additional payments may become an issue, so a review is needed.
Payment is due within the period set by law after the employee leaves, and it can be extended by agreement of the parties. The deadline follows statute, so check the latest regulations.