On payroll close day, the first thing an HR manager needs to check for employees on Korea's flexible working hours scheme (선택적 근로시간제, seontaekjeok geunro sigan je) is whether the settlement period exceeded statutory hours. The scheme does not confirm overtime on a daily or weekly basis — it judges excess against actual hours worked across the entire settlement period.
The complications start once excess hours are confirmed. Premium rates differ depending on whether those hours were ordinary overtime, night work, or holiday work, and if the employment contract includes fixed OT hours, already-paid time has to be separated from additional time owed. The correct order is: settlement period baseline → overtime premium → fixed OT offset → split by overtime, night and holiday.
The scheme is grounded in Article 52 of Korea's Labor Standards Act and lets employees set their own start and end times. Operating it requires provisions in the rules of employment delegating start and end times to the employee, plus a written agreement with the employee representative covering the settlement period, total working hours, and other statutory items. In practice, most companies pair it with core hours.
The settlement period can generally be set up to one month, extending to three months for new product or new technology R&D work. That gives employers a choice of one, two, three or four weeks, or one month — and two or three months for qualifying R&D. One month and one week are the most common in practice.
The test is whether total hours exceed 40 × the number of weeks. With a one-week period this is functionally identical to standard overtime assessment. With two, three or four weeks, the test is whether average weekly hours across the period exceeded 40.
Statutory hours are calculated as 40 hours × (days in the settlement period ÷ 7). The older method of "8 hours × scheduled working days" has not been accepted since the Ministry of Employment and Labor revised its interpretation in March 2021.
With a one-month settlement period, the baseline shifts with the calendar.
| Days in the settlement period | Statutory hours |
|---|---|
| 28 | 160 |
| 29 | 165.7 |
| 30 | 171.4 |
| 31 | 177.1 |
For a 30-day month, statutory hours are 40 × (30 ÷ 7) ≈ 171.4. If actual hours logged 184, excess is 184 − 171.4 ≈ 12.6 hours.
Exceeding 40 hours in a particular week is not itself a violation. Excess can only be confirmed once the period closes and the weekly average is calculated. The Ministry has confirmed in written guidance that whether overtime actually occurred is knowable only after the settlement period ends.
Two things need checking: whether actual hours exceeded statutory hours, and by how much. Whether they exceeded the total hours agreed with the employee representative — say 160 — is a separate question.
Once the settlement period closes and overtime hours are confirmed, those hours require a premium of at least 50% of ordinary wages. For the 12.6-hour example, multiply by 1.5 times the hourly ordinary wage.
Work performed on a public holiday or weekly rest day that also constitutes overtime is paid at double. If that holiday overtime also falls in night hours, add another 0.5 for a 2.5x rate.
Ordinary wages are the base because overtime premiums are legally calculated against wages agreed to be paid regularly and uniformly as compensation for contracted work. Payment timing is fixed only after the settlement period ends; in practice, confirmed excess is reflected in the nearest regular payday after the period closes.
The scheme can run alongside a fixed OT arrangement. If the employment contract treats a set number of hours per month as overtime and includes fixed OT pay, only hours exceeding that fixed allotment require additional payment.
Say statutory hours are 171.4, the contract includes 20 hours of monthly fixed OT, and actual hours came to 195:
Only those 3.6 hours get multiplied by 1.5x the hourly ordinary wage. Conversely, if actual overtime falls short of the fixed allotment, already-paid fixed OT is not clawed back.
Fixed OT is only valid if the hours are specified. The Ministry distinguishes arrangements that specify overtime, night and holiday hours in advance — "fixed OT" — from comprehensive wage systems. A comprehensive arrangement that merely states "overtime pay included" without specifying hours can be void, exposing the employer to a separate claim for all overtime actually worked.
Confirmed excess hours do not all carry the same premium.
These premiums can stack. Work on a holiday that extends into night hours carries both the holiday and night premiums. Include all these hours when totaling working hours for the period, but separate them when calculating premiums.
1. The gap between agreed hours and statutory hours. If actual hours exceeded the total agreed with the employee representative (say 160) but stayed under statutory hours (171.4), that excess is paid at the base hourly rate with no premium. Premiums attach only above statutory hours.
2. Deduction rules for shortfalls. If actual hours fall short of the agreed total, wages can be reduced accordingly. Whether that treatment is documented in the written agreement with the employee representative determines how much dispute risk you carry.
3. The overtime cap. Even under this scheme, average weekly overtime across the settlement period cannot exceed 12 hours.
4. Extra obligations for three-month periods. Where a three-month settlement period applies to new product or technology R&D, average working hours must be checked against the statutory baseline every month with premiums paid accordingly, and at least 11 consecutive hours of rest must be guaranteed between the end of one working day and the start of the next.
Every calculation above assumes actual hours for the settlement period are recorded accurately. If clock-in and clock-out times are captured manually or have gaps, knowing the formula does not make the result trustworthy. Capturing daily actual hours, split into overtime, night and holiday categories, is prerequisite work.
For a related read on how organizations lose clarity in internal communication, see "Every Instance Is an Object" — When Jargon Becomes the Barrier to Entry.
This article is general information, not legal advice. Consult a qualified professional on specific cases.
Against actual hours worked up to the resignation date. Compare statutory hours for the partial period through that date against actual hours worked, rather than using the full settlement period.
Not with a monthly settlement period. Excess is judged only against total actual hours versus statutory hours for the whole period, so a single week cannot confirm it. With a one-week settlement period, that week is the period, so it can be assessed immediately.
40 hours × (days in the period ÷ 7). That is 160 hours for 28 days, 165.7 for 29, 171.4 for 30, and 177.1 for 31. The older '8 hours × scheduled working days' method has not been accepted since the Ministry revised its interpretation in March 2021.
Subtract statutory hours from actual hours to get excess, then subtract the contractual fixed OT hours. Only the remainder gets multiplied by 1.5x the hourly ordinary wage. If actual overtime falls short of the fixed allotment, already-paid fixed OT is not recovered.
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