Is Unpaid Overtime Legal in Korea? The Answer Depends on One Number

Legal disclaimer: This guide is for general informational purposes only and does not constitute legal advice. Working time and wage disputes in Korea turn on the specific contract, the size of the workplace, and the facts of what was worked. Statutes and administrative interpretations change. Anyone dealing with unpaid work should contact the Ministry of Employment and Labor counseling line on 1350, which offers foreign language support, or consult a certified labor attorney (공인노무사) before acting.

This guide covers: the workplace size rule that decides whether overtime premiums exist at all, what Korean law counts as working time and what it does not, the three premium rates and how they stack, the weekly hours cap, why a contract clause saying the salary "includes overtime" is not the end of the argument, how to calculate what is owed, and the three-year deadline that quietly ends most claims.

The short answer nobody expects

Short answer: At a workplace with five or more regular employees, overtime without premium pay is unlawful. At a workplace with four or fewer, the premium provisions of the Labor Standards Act do not apply at all, so extra hours can lawfully be paid at the ordinary rate with no 50 percent uplift. In both cases, hours actually worked must still be paid at least at the minimum wage. The unpaid part is what is unlawful everywhere.

That headcount is the fact that decides the answer, and it is the reason two teachers in the same city with near-identical contracts can get opposite results from the same complaint.

	5 or more employees	4 or fewer
50 percent overtime premium	Applies	Does not apply
Night work premium	Applies	Does not apply
Holiday work premium	Applies	Does not apply
Weekly extension limit of 12 hours	Applies	Does not apply
Payment for hours actually worked	Required	Required
Minimum wage	Applies	Applies
Severance after one year	Applies	Applies

Small academies are extremely common, which is why this rarely gets explained properly in English-language guidance.

What Korean law counts as working time

Short answer: Working time is not only class time. Time spent under the employer's direction and supervision counts, including waiting time, mandatory training, and required preparation. The Ministry of Employment and Labor publishes criteria, and they draw the line at whether attendance is obligatory and whether the activity is job-related.

For a teacher, this is the part that turns a vague complaint into a countable one.

The ministry's criteria

Activity	Counted as working time?
Training that is compulsory or job-related	Yes
Training held after hours or on a holiday by mandatory summons	Yes
Voluntary self-development study	No
Seminars or workshops for socializing and team bonding	No
Company dinners (회식) held to boost morale	No, and describing attendance as mandatory does not by itself change this
Business travel under the employer's direction to a designated destination	Yes
Sports days and similar events where non-participation leads to discipline or wage deduction	Yes
The same events where non-participation carries no consequence	No

Waiting time under the employer's direction is treated as working time rather than rest, which is the principle that covers gaps between classes when a teacher is required to remain at the academy and available.

Applied to academy work

Reading that table against an ordinary teaching week produces a list that most teachers have never counted:

Lesson preparation required to happen on site during specified hours
Compulsory staff meetings before or after teaching hours
Mandatory training sessions, including curriculum rollouts
Open classes and parent demonstration lessons, along with required preparation
Level testing, placement interviews, and report writing where the academy requires them at set times
Waiting between classes where leaving is not permitted
Seasonal intensive programs added on top of a contracted schedule

Two common items fall the other way. A voluntary dinner is not working time, and a social workshop is not working time, even when everyone feels obliged to attend.

Practical tip: The contract usually states teaching hours, and working time is usually longer. The gap between those two numbers is the entire subject of this guide. Writing down actual arrival and departure times for two ordinary weeks turns an argument about fairness into an arithmetic problem, which is a much stronger position.

The premiums, where they apply

Short answer: Under Article 56 of the Labor Standards Act, overtime and night work each carry a 50 percent premium on ordinary wages, holiday work carries 50 percent for the first eight hours and 100 percent beyond eight hours, and where categories overlap the premiums stack.

Type of work	Definition	Premium
Overtime (연장근로)	Beyond 8 hours a day or 40 hours a week	50 percent
Night work (야간근로)	Between 10pm and 6am	50 percent
Holiday work, first 8 hours	Work on a statutory holiday	50 percent
Holiday work, beyond 8 hours	Work on a statutory holiday	100 percent

Overlapping categories are paid cumulatively. Overtime performed after 10pm attracts both the overtime premium and the night premium.

The premiums are calculated on ordinary wages (통상임금), which is a defined concept rather than simply the headline salary, and non-payment is a criminal matter carrying up to five years imprisonment or a fine of up to ₩50 million (raised from three years or ₩30 million for violations from October 8, 2026).

The weekly cap

The statutory standard is 40 hours a week and 8 hours a day, with extension by agreement limited to 12 additional hours a week, which produces the familiar 52-hour ceiling. At workplaces with four or fewer employees, that limit does not apply, so there is no statutory weekly ceiling on extension in the same way.

The contract clause that confuses everyone

Short answer: Many Korean contracts state that the salary already includes allowances for overtime, night, and holiday work. This is the comprehensive wage arrangement (포괄임금제). Korean courts accept it only in limited circumstances, principally where the nature of the work makes actual working hours impossible to calculate, and where the fixed amount falls short of what the statutory premiums would produce, the difference is still owed.

This matters because that clause is the single most common reason teachers assume they have no claim.

What the courts have said

The Supreme Court has treated comprehensive wage agreements as valid in specific contexts where the work pattern genuinely defies hour-by-hour measurement, considering the particular nature, form, and hours of the work together. In the same line of cases it has declined to extend that validity to every component, and has treated items such as holiday work pay, paid holiday allowances, and annual leave compensation differently.

Two principles matter for anyone reading their own contract:

The arrangement needs a reason. The threshold condition is that calculating actual working hours is not feasible. A fixed teaching timetable with recorded start and finish times does not obviously meet that description.
The fixed amount is a floor, not a cap. Where the statutory calculation exceeds the fixed sum built into the salary, the shortfall is payable.

A related point from a December 2024 Supreme Court decision concerns minimum wage compliance under a fixed-sum comprehensive wage arrangement, where the question was how contracted overtime hours and the wages attributed to them are treated in the comparison.

Practical tip: A clause saying the salary includes overtime is worth reading closely for two things: how many hours of overtime it claims to cover, and what portion of the salary is attributed to them. A clause that names neither is difficult for an employer to rely on later, because there is nothing to compare the statutory calculation against.

What this means at a small academy

Short answer: At an academy with four or fewer employees, extra hours are lawful without premium pay, but they are not lawful without pay. The base rate for those hours is still owed, and it cannot fall below the minimum wage.

This is the distinction that gets lost in the phrase "unpaid overtime."

Consider a teacher at a four-person academy who works six hours beyond the contracted schedule in a month. Those six hours attract no 50 percent uplift because Article 56 does not apply. They are still work, and work is paid. Paying nothing for them is wage non-payment, which is actionable regardless of headcount.

Two further protections survive at any workplace size:

Minimum wage. For 2026 the rate is ₩10,320 per hour, with a monthly equivalent of ₩2,156,880 at 209 hours. Total pay divided by total hours actually worked cannot fall below the hourly rate.
Severance. Payable after one year of continuous service at an average of 15 hours or more per week.

Practical tip: Headcount is a factual question with a documentary answer, not a matter of opinion. The list of workplace subscribers to the four major social insurances is the document that shows it, and a labor office can establish it during an investigation.

Working out what is owed

Short answer: Convert the monthly salary to an hourly rate using 209 hours, multiply by 1.5 for hours attracting the overtime premium, and by 1.0 for extra hours at a workplace where the premium provisions do not apply.

The arithmetic

The 209-hour figure is the standard monthly conversion for a 40-hour week including weekly paid holiday entitlement, and it is the divisor used in the official minimum wage monthly equivalent.

For a salary of ₩2,500,000 a month:

Step	Calculation	Result
Hourly ordinary rate	₩2,500,000 ÷ 209	About ₩11,962
Overtime rate at 5 or more employees	₩11,962 × 1.5	About ₩17,943
Rate for extra hours at 4 or fewer employees	₩11,962 × 1.0	About ₩11,962
Ten hours of overtime, 5 or more employees	₩17,943 × 10	About ₩179,430
Ten hours of extra work, 4 or fewer employees	₩11,962 × 10	About ₩119,620

These figures are illustrative. Ordinary wages for premium purposes are a defined concept and may differ from the headline monthly salary depending on how allowances are structured, which is one reason a labor office or a certified labor attorney is worth involving for anything substantial.

The three-year deadline

Short answer: Wage claims expire three years after they could first have been exercised, which for wages means the regular payday for each amount. Retirement benefit claims carry the same three-year period. Every month that passes permanently removes the oldest month from any claim.

This is the quiet reason long-running situations end badly. A teacher who tolerates unpaid hours for two years and then raises it has already lost nothing, but a teacher who waits four years has lost the first year entirely.

The period runs separately for each payment, so a claim is not all-or-nothing. It is a rolling three-year window.

If the hours are unpaid

Record the hours. Arrival and departure times, class schedules, meeting times, and any instruction requiring attendance. Contemporaneous records carry more weight than reconstruction.
Keep the documents. Contract, payslips, bank statements showing what was actually deposited, and the messages in which schedule changes were communicated.
Establish the headcount. It determines which half of this guide applies.
Ask internally first, in writing. Many cases are administrative errors rather than deliberate underpayment, and a written request creates a record either way.
Call 1350. The Ministry of Employment and Labor counseling line covers wages, working hours, and contracts, with foreign language support.
File a complaint with the local labor office where it is not resolved. A labor inspector investigates and, where wages are confirmed unpaid, the employer is directed to pay.
Mind the visa timeline separately. A wage dispute and immigration status run on different clocks, as covered in the guide to academy closures.

Practical tip: Colleagues in the same position strengthen a case considerably. A pattern across several teachers is harder to characterize as a misunderstanding than a single claim, and one person's records frequently fill gaps in another's.

For academies

Hagwon Hub content is read by academy operators as well as teachers, and most overtime disputes are avoidable at the scheduling and drafting stage.

Write the schedule that will actually be worked. A contract listing teaching hours while the role requires two hours of compulsory on-site duties is a dispute waiting for a trigger.
Record hours. Where a comprehensive wage clause is used, records are what demonstrate the fixed amount was sufficient.
State what the fixed amount covers. A clause naming the hours covered and the portion of salary attributed to them is far more defensible than one that does not.
Check the headcount rule before relying on it. Employee numbers change, and crossing the five-employee threshold changes the obligations immediately.
Separate social events from work. A voluntary dinner is not working time, and keeping it genuinely voluntary keeps it that way.

Common problems and what causes them

Problem	Cause	What works
Extra hours paid at the flat rate	Workplace has four or fewer employees	Confirm headcount; the base rate is still owed for those hours
Contract says overtime is included	Comprehensive wage clause	The fixed amount is a floor; a shortfall against the statutory calculation is payable
Prep and meetings unpaid	Working time treated as only class time	Compulsory, job-related time under direction counts
Dinner attendance resented as unpaid work	Social events are not working time	Distinguish social events from mandatory job-related duties
Claim partially refused	Three-year limitation	File before the oldest months expire
Cannot prove the hours	No contemporaneous record	Start a daily log now, however late it feels
Night work unpaid	Late classes after 10pm	Night premium applies at workplaces with five or more employees, on top of overtime

Frequently asked questions

Is unpaid overtime legal in Korea?
Working extra hours without the statutory premium is lawful only at workplaces with four or fewer regular employees, where the premium provisions do not apply. At workplaces with five or more, overtime requires a 50 percent premium. Working with no pay at all for hours actually worked is unlawful at any size.

What is the overtime rate in Korea?
Ordinary wages plus 50 percent for overtime, plus 50 percent for night work between 10pm and 6am, and for holiday work 50 percent for the first eight hours and 100 percent beyond eight. Overlapping categories stack.

Does the 52-hour week apply to academies?
The statutory structure is 40 hours a week plus up to 12 hours of agreed extension, at workplaces with five or more employees. At smaller workplaces the extension limit does not apply in the same way.

Does lesson preparation count as working time?
Compulsory, job-related time under the employer's direction counts as working time. Voluntary self-development does not. The decisive questions are whether attendance is required and whether the activity is job-related.

Does a company dinner count as working time?
Ministry guidance says company dinners held to boost morale are not working time, and calling attendance mandatory does not by itself change that.

The contract says the salary includes overtime. Is that valid?
Comprehensive wage agreements are recognized only in limited circumstances, principally where actual working hours cannot feasibly be calculated. Where the fixed amount falls short of the statutory calculation, the difference remains payable.

How is overtime pay calculated?
Divide the monthly salary by 209 to get the hourly ordinary rate, then multiply by 1.5 for hours attracting the overtime premium. Ordinary wages for this purpose are a defined concept and may differ from the headline salary.

How long is there to claim unpaid wages?
Three years from when each amount could first have been claimed, which for wages means each regular payday. Retirement benefit claims carry the same three-year period.

What happens if an employer does not pay premiums that are owed?
Non-payment under Article 56 is a criminal matter carrying up to five years imprisonment or a fine of up to ₩50 million for violations from October 8, 2026 (three years or ₩30 million before that), and the labor office can direct payment following a complaint.

Does any of this apply if the academy has only three teachers?
Minimum wage, payment for hours worked, and severance after one year all still apply. The premium provisions and the extension limit do not.

Where should a complaint be filed?
With the local labor office, with guidance available in foreign languages through 1350.

Can filing a complaint affect the visa?
The employment claim and immigration status are separate processes on different timelines. Status questions go to the Immigration Contact Center on 1345, and the practical sequence is usually to secure status first.

The short version

The surprising part of Korean overtime law is not that the rules are weak. Overtime carries a 50 percent premium, night work adds another 50, holiday work beyond eight hours doubles, and non-payment is a criminal offense.

The surprise is that none of the premium provisions apply at workplaces with four or fewer employees, which describes a large share of Korean academies. At those workplaces, extra hours can lawfully be paid at the flat rate.

What never changes is that hours worked must be paid, that the minimum wage applies everywhere, that compulsory job-related time is working time whether or not it happens in a classroom, and that the claim expires three years from each payday.

The single most useful thing a teacher can do is write down what time they arrived and what time they left, starting today.

Sources

For which dismissal and wage protections change with workplace size, see the guide to probation clauses. For what happens when an employer cannot pay at all, see the guide to academy closures. For reaching 1350 in English, see the guide to English hotlines in Korea.