Can Job Classification Justify Bonus Denial in South Korea?
Table of Contents
- 1. What Was the Dispute About?
- 2. Are Fixed-Term Contract Workers in South Korea Protected Against Wage Discrimination?
- 3. How Is the Correct Comparator Worker Identified in South Korea?
- 4. How Do South Korean Courts Determine Whether Unfavorable Treatment Exists?
- 5. Why Did the Employer’s Justifications Fail in Court?
- 6. Does the Elderly Employment Act Shield Employers When Rehiring Retirees?
- 7. FAQ
Based on an actual case: Worker X had over a decade of investigative experience before being hired as a commissioned (fixed-term) worker at institution Y in South Korea. Colleagues in the same department doing the same security work — but classified as indefinite-term employees — received an annual internal performance bonus worth two to three months’ salary. X received nothing, for one reason alone: a different job classification label. Was this legal?
Same Work, Different Label — and a Multi-Year Legal Battle
Note: The following is based on actual court decisions (Seoul Administrative Court Case No. 2020Guhap67650; Seoul High Court Cases No. 2021Nu52688 and No. 2021Nu58570), with parties anonymized as X (worker), Y (employer institution), and A, B, C (other individuals) to protect privacy.
Within a single department at institution Y, commissioned (fixed-term) workers and indefinite-term employees worked side by side on the same security-related tasks. Job survey documents confirmed that both groups spent 80% of their time on information-gathering duties, 10% on monitoring related parties, and 5% each on preventive review and investigation support. Yet Y paid the indefinite-term employees an internal performance bonus equal to 210–270% of their monthly base salary each year, while paying nothing to the fixed-term workers in X’s position. The dispute moved through regional and central labor commissions and two separate rounds of administrative litigation before courts confirmed that the differential treatment was unlawful.
1. What Was the Dispute About?
Three core legal questions were at issue. First, whether fixed-term commissioned workers who renewed annual contracts were “fixed-term workers” within the meaning of the Fixed-Term Workers Act. Second, whether the indefinite-term employees in the same department could serve as valid comparators. Third, whether Y’s refusal to pay internal performance bonuses and seniority allowances constituted discrimination without rational justification.
The Pay Gap at a Glance
| Item | Fixed-Term Workers (X and colleagues) | Indefinite-Term Employees |
|---|---|---|
| Primary duties | Security information gathering, investigation support | Security information gathering, inter-agency coordination |
| Internal performance bonus | Not paid (through 2018) | 210–270% of monthly base salary per year |
| Seniority allowance | Not paid | Paid from July 2019 |
| Retirement age / work age ceiling | Age 65 (no wage peak system) | Age 60 (wage peak system applied) |
2. Are Fixed-Term Contract Workers in South Korea Protected Against Wage Discrimination?
Institution Y argued that X and the other commissioned workers were effectively indefinite-term employees in substance, because they had been routinely rehired up to the maximum work age. If so, the Fixed-Term Workers Act would not apply.
What Makes a Contract “Fixed-Term” Under South Korean Law?
The South Korean Supreme Court has recognized that a nominally fixed-term contract may be recharacterized as an indefinite-term arrangement when short-term contracts are repeatedly renewed over a long period to the point where the stated term is a mere formality — depending on the circumstances of formation, the parties’ true intent, the length of service, the number of renewals, and applicable labor protection statutes (Supreme Court Decision 2005Du16901, September 7, 2007).
However, the courts did not apply that doctrine here. The employment contracts explicitly stated that failure to renew before expiration would result in automatic termination, and Y’s internal guidelines allowed performance evaluations to affect the renewal decision. Given these terms, the contracts could not be treated as indefinite in character. The workers were therefore subject to the Fixed-Term Workers Act and entitled to seek discrimination correction (Seoul Administrative Court Decision 2020Guhap67650).
3. How Is the Correct Comparator Worker Identified in South Korea?
Selecting the right comparator is the foundation of any fixed-term discrimination claim in South Korea. The legal standard requires looking at what workers actually do, not at what their contracts or job descriptions say.
The “Core Duties” Standard
Article 8(1) of the Fixed-Term Workers Act requires a comparator who performs “the same or similar work.” South Korean courts assess this by examining actual work performed, and hold that workers are in the same or similar roles if the core content of their duties is not fundamentally different — even where there are differences in scope, authority, or responsibility (Supreme Court Decision 2011Du5391, November 27, 2014).
In this case, Y argued that the indefinite-term employees’ duties had changed by 2019 and were no longer comparable. The Seoul High Court disagreed. Both groups were gathering security-related information to ensure operational integrity; the difference in the precise targets or methods of information collection was not fundamental. Moreover, Y itself had stated in the reexamination proceedings that indefinite-term employees’ primary duties were “monitoring trends among relevant organizations” — functionally indistinguishable from the fixed-term workers’ information-gathering mandate (Seoul High Court Decision 2021Nu52688).
Who Among Multiple Comparators Should Be Selected?
Y proposed that the comparison should use the lowest-paid indefinite-term employee to avoid a “reverse discrimination” outcome. The court rejected this, explaining that when the issue is whether workers doing equivalent work are treated differently solely because of job classification, the comparator must be someone whose characteristics — other than the classification in question — are substantially similar to the claimant’s. An employee hired at a point that fell within the disputed period and whose pay conditions may have been influenced by that timing was not an appropriate reference point (Seoul High Court Decision 2021Nu52688).
4. How Do South Korean Courts Determine Whether Unfavorable Treatment Exists?
The Fixed-Term Workers Act defines discriminatory treatment as treating a worker “unfavorably without rational justification” in wages or other working conditions (Article 2, Item 3). Unfavorable treatment means any disadvantage arising from a difference in how the employer treats the fixed-term worker compared with the comparator (Supreme Court Decision 2011Du7045, October 25, 2012).
Item-by-Item Comparison Is the Default; Category-Based Comparison Is the Exception
South Korean courts compare wage items one by one as the default approach. A category-based comparison — grouping related items — is only appropriate where the two groups’ wage structures are configured so differently that item-by-item comparison is impractical, or where the fixed-term worker gains in one item what is lost in another (Supreme Court Decision 2016Du47857, September 26, 2019).
Y contended that a total-compensation comparison was appropriate, pointing to the fact that fixed-term workers had a higher salary growth rate in some years and were not subject to the wage peak system. The court disagreed: the two groups’ wage components were essentially the same, and the only meaningful difference was the presence or absence of the internal performance bonus. Item-by-item comparison was therefore fully viable, and the bonus shortfall stood as unfavorable treatment (Seoul Administrative Court Decision 2020Guhap67650).
5. Why Did the Employer’s Justifications Fail in Court?
Even where unfavorable treatment is established, an employer may avoid liability by demonstrating rational justification. Rational justification is absent when there is no genuine need to treat the fixed-term worker differently, or when the differential treatment — even if motivated by a legitimate need — is disproportionate in method or degree. The analysis turns on the nature of the specific pay item at issue, the employer’s stated reasons, the workers’ employment type, the scope and responsibility of their work, and related factors (Supreme Court Decision 2011Du5391, November 27, 2014).
Summary of Y’s Arguments and the Courts’ Responses
| Y’s Argument | Court’s Response |
|---|---|
| The internal performance bonus compensates indefinite-term employees for reduced wages under the wage peak system | The bonus predated the wage peak system and was paid to all indefinite-term employees regardless of whether they were subject to the wage peak system. Government budget guidelines prohibited using performance bonus funds for purposes other than performance incentives. Rational justification: rejected |
| The seniority allowance was introduced through collective bargaining in exchange for a lower wage increase rate for indefinite-term employees | The collective agreement addressed only a general principle for future wage negotiations; there was no specific agreement to lower the wage growth rate as a quid pro quo for the new allowance. Rational justification: rejected |
| The groups have different retirement ages (60 vs. 65), so differential pay is justified | No logical connection exists between retirement age and an internal performance bonus calculated by departmental evaluation. Rational justification: rejected |
| Fixed-term workers are classified as a priority employment category for older workers under the Elderly Employment Act, permitting rational pay differentiation based on length of service | This argument relied on total-compensation comparison, which the court had already rejected. The bonus rate is set by department-wide evaluation and is unrelated to individual tenure. Rational justification: rejected |
6. Does the Elderly Employment Act Shield Employers When Rehiring Retirees?
Some of the workers in the related proceedings had originally been indefinite-term employees, retired upon reaching the mandatory retirement age, and then returned to the same department as fixed-term commissioned workers. Y invoked Article 21(2) of the Act on Prohibition of Age Discrimination in Employment and Elderly Employment Promotion, which permits employers to set wage conditions differently from previous arrangements when rehiring retired workers — provided there is an agreement between the parties.
The Requirement of Explicit, Specific Agreement
The Seoul High Court addressed this argument carefully. It confirmed that the purpose of Article 21(2) is to reduce the cost burden on employers who voluntarily rehire older workers, thereby encouraging such rehiring as a matter of employment policy. Where a retired worker and an employer have explicitly negotiated and agreed to different wage terms upon reengagement, the resulting pay arrangement does not constitute age discrimination under Article 4-4 of the same Act.
However, the court held that “agreement between the parties” in this provision means a specific, explicit mutual agreement on wage conditions. The fact that a worker was aware of the previous pay level — and said nothing — does not constitute consent to different terms upon rehiring. Without a clearly negotiated arrangement, excluding a rehired fixed-term worker from the internal performance bonus cannot be justified under this provision (Seoul High Court Decision 2021Nu52688).
This interpretation reflects the dual legislative purpose of the Act: promoting employment of older workers while simultaneously prohibiting irrational age-based discrimination. Allowing the rehire provision to function as a broad exemption from the Fixed-Term Workers Act would undermine the latter goal.
7. FAQ
Fixed-term worker discrimination cases in South Korea involve overlapping questions of contract characterization, comparator selection, wage item analysis, and rational justification review. Through analysis of multiple proceedings in this line of cases, the pattern that emerges is consistent: courts examine the actual purpose and history of each disputed pay item rather than accepting employer narratives built on broad categories like “different job classification” or “wage structure differences.” For foreign-invested companies and employers operating across workforce segments in South Korea, this framework has direct implications for how compensation policies are designed and documented.
Atlas Legal advises corporate clients on employment law compliance and workforce structuring in South Korea. The firm is based in Incheon Songdo — within the international business district — and provides services in both Korean and English.
The information in this post is provided for general informational purposes only and does not constitute legal advice. The applicable legal standards may vary depending on the specific facts of each case. For advice on a particular matter, please consult a qualified attorney.