Must Prime Contractors Bargain with Subcontractor Unions in South Korea? Amended Trade Union Act Explained
Table of Contents
- 1. Why Are Prime Contractors Now Parties to Collective Bargaining? — Background of the Amendment
- 2. When Is a Prime Contractor Recognized as an “Employer” Under South Korean Labor Law?
- 3. How Do Bargaining Units and Bargaining Channel Unification Work in Prime–Sub Bargaining?
- 4. What Are the Step-by-Step Bargaining Procedures Between Prime Contractors and Subcontractor Unions?
- 5. How Can a Party Apply for Bargaining Unit Separation?
- 6. What Sanctions Apply If a Prime Contractor Refuses to Bargain or Fails to Follow Procedures?
- 7. FAQ
Hypothetical scenario: The general counsel of a major South Korean manufacturer received an urgent call. Employees of its on-site subcontractors had sent a formal written demand for collective bargaining — addressed not to their own employer, but to the prime contractor. “We never signed employment contracts with those workers. Do we really have to negotiate with them?” Under South Korea’s amended Trade Union Act, effective March 10, 2026, the answer depends entirely on the facts.
South Korea’s Labor Law Landscape Has Changed — What the Amendment Really Means
※ The scenario described above is entirely hypothetical and is presented for illustrative purposes only.
The situation faced by that general counsel is one that countless prime contractors and large corporations across South Korea will now encounter. Under the prior law, only parties to a direct employment contract could be treated as an “employer” subject to collective bargaining obligations. Yet in a business environment where subcontracting, outsourcing, and staffing arrangements are the norm, the reality was that prime contractors often dictated working conditions for workers they had never directly hired. Critics argued this structure allowed prime contractors to enjoy de facto control over a workforce while shielding themselves from the corresponding legal duties. The amendment addresses this directly by adding a second sentence to Article 2(2) of the Trade Union Act, effective March 10, 2026. Prime contractors must now assess whether they qualify as a “non-contract employer,” determine which working conditions fall within their sphere of control, and carefully follow the new bargaining procedures — or risk criminal liability for unfair labor practices.
1. Why Are Prime Contractors Now Parties to Collective Bargaining? — Background of the Amendment
To understand the new rules, it helps to start with why the law was changed. The Prime Contractor–Subcontractor Mutual Prosperity Collective Bargaining Procedure Manual (jointly issued by the Ministry of Employment and Labor and the National Labor Relations Commission, February 2026; hereinafter “the Manual”) explains the legislative intent as follows.
Modern South Korean industrial sites commonly feature workers employed by subcontractors, staffing agencies, or service providers working side-by-side with the prime contractor’s own employees — often in the same facility, subject to the same production schedules, safety rules, and workplace directives set by the prime contractor. Despite this practical reality, the prior law allowed prime contractors to avoid collective bargaining obligations simply because they had not signed employment contracts with those workers. Courts and scholars had long criticized this outcome as a formalistic evasion of the constitutional right to collective bargaining.
The amendment directly resolves this problem. The revised Article 2(2) adds a second sentence that expands the definition of “employer” to cover non-contract employers.
Prior text: Article 2 (Definitions) The terms used in this Act are defined as follows:
2. The term “employer” means a business owner, a person in charge of managing a business, or a person who acts on behalf of the business owner with regard to matters concerning workers of the business. <second sentence newly added>
Amended text: Article 2 (Definitions) The terms used in this Act are defined as follows:
2. The term “employer” means a business owner, a person in charge of managing a business, or a person who acts on behalf of the business owner with regard to matters concerning workers of the business. In such cases, a person who, even without being a party to an employment contract, is in a position to substantially and concretely control or determine the working conditions of workers, shall also be deemed an employer to that extent.
The two pivotal phrases are “even without being a party to an employment contract” and “substantially and concretely control or determine.” When both conditions are met, the prime contractor is deemed an employer under the Trade Union Act within that scope, and a collective bargaining duty arises.
The Manual emphasizes that prime–subcontractor bargaining is intended not merely to protect subcontractor workers’ rights, but to foster “labor-management relations built on dialogue for mutual prosperity between prime and subcontractor companies.” Prime contractors should therefore view these procedures as an opportunity to proactively manage labor relations risk.
2. When Is a Prime Contractor Recognized as an “Employer” Under South Korean Labor Law?
For the amended Article 2(2) second sentence to apply, the prime contractor must be in a position to substantially and concretely control or determine subcontractor workers’ working conditions. This does not require total or comprehensive control over all working conditions.
The Key Concept: Partial Employer Status
The Manual characterizes prime contractors recognized under the amendment as “non-contract employers.” This means that even though no direct employment relationship exists, the prime contractor is responsible — and obligated to bargain — only with respect to the specific working conditions over which it exercises substantive control. Employer status is thus condition-specific and scope-limited, not all-or-nothing.
Examples of Working Conditions That May Establish Employer Status
Whether the prime contractor has substantial and concrete control over a particular working condition is a fact-specific inquiry. Drawing on the Ministry of Employment and Labor’s Interpretive Guidelines on Amended Trade Union Act Article 2 and the Manual, the following are illustrative factors:
| Category | Factors Potentially Establishing Employer Status |
|---|---|
| Work direction and control | Prime contractor managers directly instruct subcontractor workers; prime contractor determines work assignments |
| Safety and health standards | Prime contractor unilaterally sets workplace safety rules and personal protective equipment standards |
| Wage levels | Prime contractor’s subcontracting price decisions effectively determine subcontractor workers’ wages |
| Working hours and shift schedules | Subcontractor workers’ hours are determined by the prime contractor’s production schedule and shift rotation |
| Personnel decisions | Prime contractor exercises de facto disciplinary authority — e.g., barring workers from the site or excluding them from tasks |
Critically, if the prime contractor has substantial control over even one of the above, employer status may be recognized with respect to that condition, giving rise to a bargaining obligation limited to that subject. Employer status is assessed condition by condition and scope by scope.
Does the Amendment Apply to Off-Site Subcontractors?
Yes. The Manual states that where there is a basis for recognizing employer status under the Interpretive Guidelines — regardless of whether the subcontractor operates on-site or off-site — the prime contractor bears the posting obligation. The form of the contract (subcontracting, outsourcing, consignment, etc.) is irrelevant; what matters is the substance of the prime contractor’s control.
3. How Do Bargaining Units and Bargaining Channel Unification Work in Prime–Sub Bargaining?
Two foundational concepts govern the structure of prime–subcontractor bargaining: the bargaining unit and the bargaining channel unification procedure.
The Bargaining Unit: All Subcontractor Workers as One
In prime–subcontractor bargaining, the bargaining unit is “all subcontractor workers” — meaning all workers employed by subcontractors within the scope of the prime contractor’s employer status. Workers employed by different subcontractor companies may all form part of a single bargaining unit because they share a common interest: the prime contractor’s control over their working conditions.
One critical point: the prime contractor’s own union is not part of this bargaining unit. That union continues to bargain with the prime contractor in a separate, pre-existing bargaining unit. No bargaining unit separation procedure between the prime contractor’s union and the subcontractor unions is required.
Bargaining Channel Unification: Why Subcontractor Unions Must First Organize Among Themselves
Where two or more labor unions organized or joined by workers in a single business or workplace, regardless of organizational form, seek to bargain, such labor unions shall designate a bargaining representative union and demand bargaining. Provided, however, that this shall not apply where, within the period for autonomously determining a bargaining representative union under paragraph (3), the employer agrees not to undergo the bargaining channel unification procedure under this Article.
Article 29-2 of the Trade Union Act is a mandatory provision that applies equally to prime–subcontractor bargaining. Where multiple subcontractor unions seek to bargain with the same prime contractor, those unions must first undergo the bargaining channel unification procedure among themselves to designate a bargaining representative union before approaching the prime contractor.
The purpose is twofold. First, to establish a coherent and stable bargaining structure that produces uniformly applicable terms for all subcontractor workers. Second, to protect prime contractors from being simultaneously pulled into separate negotiations with multiple unions.
A key exception: if a subcontractor union bypasses the channel unification procedure and demands individual bargaining directly, the prime contractor has no legal obligation to comply. Individual bargaining is only available with the employer’s consent, within the framework of the channel unification procedure.
4. What Are the Step-by-Step Bargaining Procedures Between Prime Contractors and Subcontractor Unions?
The overall process consists of two phases: (i) confirming which unions are participating in the channel unification procedure, and (ii) designating the bargaining representative union. Here is a step-by-step breakdown.
STEP 1. Subcontractor Union Submits Bargaining Demand
① Where there is a collective agreement in effect at the relevant business or workplace, a labor union may demand bargaining from the employer pursuant to Article 29(1) or Article 29-2(1) of the Act from the date that is three months before the expiry date of such collective agreement. Where there are two or more collective agreements, the demand may be made from the date that is three months before the earlier expiry date.
② When demanding bargaining from an employer pursuant to paragraph (1), the labor union shall do so in writing, specifying the name of the labor union, the number of regular worker members as of the date of the bargaining demand, and other matters prescribed by Ministerial Ordinance of Employment and Labor.
When submitting a bargaining demand to a prime contractor, subcontractor unions should note:
- No pre-existing collective agreement: If no collective agreement previously governed the prime–subcontractor relationship, a bargaining demand may be submitted immediately after the Act takes effect on March 10, 2026.
- Pre-existing collective agreement: The demand may be submitted from the date three months before the expiry of that agreement.
- Bargaining representative union term still running: The demand must wait until the current representative union’s term of authority expires.
The demand must be in writing specifying the union’s name, number of regular worker members, and other particulars required by Ministerial Ordinance. An oral demand or email alone may be insufficient.
STEP 2. Prime Contractor Posts Bargaining Request Notice
① Upon receiving a bargaining demand from a labor union pursuant to Article 14-2, the employer shall, for seven days from the date of receipt, post the name of the labor union that submitted the demand and other matters prescribed by Ministerial Ordinance of Employment and Labor at the bulletin board and other locations of the relevant business or workplace, so that other labor unions and workers may be informed thereof.
② A labor union may, if the employer fails to make the posting under paragraph (1) or posts incorrectly, request correction from the Labor Relations Commission in the manner prescribed by Ministerial Ordinance of Employment and Labor.
Upon receiving a bargaining demand, the prime contractor must post a notice of the bargaining request for seven days. This posting obligation is particularly important and complex in prime–subcontractor bargaining.
Scope of posting: The notice must be posted so that all subcontractor unions and subcontractor workers — whether their employer status vis-à-vis the prime contractor has been confirmed or only appears likely — can see it. A posting confined to a narrow area or specific subcontractor is insufficient.
Method of posting: The Manual provides detailed guidance, including:
- Post at bulletin boards as well as on walls, pillars, rest areas, entrances, and cafeterias used by subcontractor workers
- If subcontractor workers have access to the prime contractor’s IT systems, post on those systems as well
- Request cooperation from subcontractor companies to post on their own bulletin boards and IT systems
- For geographically distributed worksites, ensure posting at all relevant locations
Relevant case law: The Seoul High Court held that posting a bargaining request notice only in front of the head office elevator and in the head office lobby was insufficient to constitute notice “so that other labor unions and workers may be informed thereof” in an enterprise with 8 regional headquarters and 82 branch offices (Seoul High Court, July 20, 2018, 2018Nu39531; Supreme Court dismissed further appeal). This principle applies equally to prime–subcontractor bargaining.
Consequences of deficient posting: A subcontractor union that was unable to participate in channel unification proceedings due to an inadequate posting may file a correction request with the Labor Relations Commission. If the Commission issues a correction order, the prime contractor must restart the entire channel unification procedure. This means additional cost and delay — a significant practical risk for prime contractors.
STEP 3. Other Subcontractor Unions Submit Participation Demands
Where there is a labor union that has demanded bargaining from an employer pursuant to Article 14-2, other labor unions wishing to bargain with the employer shall demand bargaining from the employer in writing, specifying the matters under Article 14-2(2), within the posting period under Article 14-3(1).
During the seven-day posting period, any other subcontractor union wishing to participate must submit a written bargaining demand to the prime contractor. Here too, the prime contractor must have employer status with respect to that union’s members for the union to be eligible to participate.
STEP 4. Prime Contractor Posts Confirmed List of Participating Unions
① On the day following the expiry of the posting period under Article 14-3(1), the employer shall confirm and notify the labor unions that demanded bargaining pursuant to Articles 14-2 and 14-4, and shall post for five days the name of such labor unions, the number of regular worker members as of the date of each bargaining demand, and other matters prescribed by Ministerial Ordinance of Employment and Labor.
② A labor union that demanded bargaining pursuant to Articles 14-2 and 14-4 may, if it determines that its information has been posted differently from what it submitted, or has not been posted, file an objection with the employer during the posting period under paragraph (1).
③ Where the employer determines that the objection under paragraph (2) is well-founded, it shall post in accordance with the objection for five days from the expiry of the posting period under paragraph (1), and notify the labor union that filed the objection.
④ If the employer takes any of the following actions in response to an objection under paragraph (2), the relevant labor union may file a correction request with the Labor Relations Commission within five days from the date specified in each subparagraph.
1. Where the employer fails to post pursuant to paragraph (3): the day after the expiry of the posting period under paragraph (1).
2. Where the employer posts differently from what the labor union requested in the objection: the expiry of the posting period under paragraph (3).
On the day after the initial seven-day posting period ends, the prime contractor must confirm the list of participating unions and post a five-day confirmation notice. If a union finds its information omitted or incorrectly stated, it may first raise an objection with the prime contractor. If the prime contractor does not respond appropriately, the union may seek correction from the Labor Relations Commission.
If the confirmation posting reveals that only the initial bargaining-demand union is participating — with no other unions — subsequent channel unification steps (autonomous designation, majority union determination, joint bargaining team formation) are unnecessary, and bargaining may proceed directly. However, note that in this case the union does not acquire the legal status of “bargaining representative union.”
STEP 5. Autonomous Designation of Bargaining Representative Union or Individual Bargaining Consent
Labor unions confirmed or determined pursuant to Article 14-5 that wish to autonomously designate a bargaining representative union pursuant to Article 29-2(3) of the Act shall, with the deadline being the date that is 14 days from the date of confirmation or determination under Article 14-5, notify the employer by signing or affixing their seals jointly, specifying the name of the representative of the bargaining representative union, the bargaining committee members, and other information.
The confirmed participating unions have 14 days to autonomously designate a bargaining representative union, or to obtain the prime contractor’s consent to proceed with individual bargaining. The Manual recommends that unions with similar interests work toward voluntary formation of a joint bargaining team. Labor consulting support from local employment and labor offices is also available.
STEP 6. Majority Union Determination or Joint Bargaining Team Formation
If no representative union is autonomously designated within 14 days and the prime contractor does not consent to individual bargaining:
- Majority union: A union that represents a majority of all workers covered by the channel unification procedure becomes the bargaining representative union. Two or more unions may combine through delegation or affiliation to reach a majority.
- Joint bargaining team: If no majority union emerges, all participating unions must form a joint bargaining team and bargain jointly.
5. How Can a Party Apply for Bargaining Unit Separation?
While all subcontractor workers form a single bargaining unit by default, separation may be warranted in some circumstances. Article 29-3 of the Trade Union Act provides the legal basis.
Legal Basis for Bargaining Unit Separation
① The unit within which a bargaining representative union must be determined pursuant to Article 29-2 (hereinafter “bargaining unit”) shall be a single business or workplace.
② Notwithstanding paragraph (1), where it is recognized that it is necessary to separate bargaining units or consolidate separated bargaining units in a single business or workplace, taking into consideration significant differences in working conditions, type of employment, bargaining practices, and other factors, the Labor Relations Commission may, upon application by either or both parties to the labor relationship, decide to separate or consolidate bargaining units.
Standing to Apply
“Parties to the labor relationship” eligible to apply are: (i) all subcontractor unions organized among the workers within the scope of the prime contractor’s employer status, and (ii) the prime contractor itself. A subcontractor union whose employer status vis-à-vis the prime contractor has not been confirmed lacks standing to apply. Standing should therefore be verified before filing.
Timing — Missing the Window Results in Dismissal
A labor union or employer wishing to separate or consolidate bargaining units pursuant to Article 29-3(2) of the Act may apply to the Labor Relations Commission for a decision to separate or consolidate bargaining units during the following periods:
1. Before the employer posts the bargaining request notice pursuant to Article 14-3; or
2. After the bargaining representative union has been determined pursuant to Article 29-2 of the Act, where the employer has posted the bargaining request notice pursuant to Article 14-3.
Applications filed while channel unification proceedings are underway — i.e., after the posting but before the representative union is determined — will be dismissed pursuant to Labor Relations Commission Rules Article 134(4). If separation is contemplated, act either before the posting or after the representative union is determined.
Criteria for Separation
③ Upon receiving an application under paragraph (1), the Labor Relations Commission shall decide whether to separate or consolidate bargaining units pursuant to Article 29-3(2) of the Act, taking the following matters into consideration:
1. Significant differences in working conditions, considering the nature and content of work, working environment, degree of responsibility, wage system, composition and payment methods, working hours, holidays and leave, welfare benefits, and compensation and service regulations;
2. Type of employment, considering the form and method of contract, occupation, method of recruitment, retirement age, and interchange of personnel;
3. Bargaining practices, considering the scope of union membership and member qualifications, scope of unionized workers, history of collective bargaining and labor-management consultation, and the scope of application of collective agreements;
4. Other matters comparable to items 1 through 3 that the Labor Relations Commission deems necessary.
④ Where a Labor Relations Commission receiving an application under paragraph (1) decides on separation or consolidation in relation to bargaining with an employer under Article 2(2) second sentence of the Act, with respect to workers covered by that second sentence, it shall give priority over the matters in paragraph (3) to the commonality or similarity of interests among labor unions, the adequacy of representation of those interests by other labor unions, and the likelihood of conflict among labor unions and distortion of labor-management relations if the bargaining unit is maintained.
In prime–subcontractor bargaining specifically, the criteria in paragraph (4) — commonality of interests, adequacy of representation, and potential for conflict — take priority over the general criteria in paragraph (3). Possible forms of separation include:
- By job function: Separating all subcontractor workers into groups A, B, and C by type of work
- By federation affiliation: Separating by national federation, considering shared interests and representational adequacy
- By subcontractor characteristics: Grouping subcontractors with similar working conditions and employment arrangements (e.g., subcontractors a, b, c vs. d, e, f)
A separation decision by the Labor Relations Commission takes effect upon service on the parties. Even if administrative litigation is filed, the decision remains in force unless and until it is set aside (Labor Relations Commission Act, Articles 17-2(2) and 27(2)).
6. What Sanctions Apply If a Prime Contractor Refuses to Bargain or Fails to Follow Procedures?
The effectiveness of the new regime depends on enforcement. The Manual sets out the following sanction framework.
Failure to Follow Bargaining Procedures
| Stage | Action | By Whom |
|---|---|---|
| Stage 1 | Correction request for failure to post bargaining request notice | Subcontractor union → Labor Relations Commission |
| Stage 2 | Assessment of employer status and posting obligation; issuance of correction order | Labor Relations Commission |
| Stage 3 | Guidance on compliance with correction order | Local employment and labor office |
| Stage 4 | Referral for criminal prosecution as unfair labor practice (refusal/evasion of bargaining) | Local employment and labor office |
The critical point: once a correction order is issued and the prime contractor still fails to comply without justification, the conduct may be treated as refusal or evasion of collective bargaining — an unfair labor practice subject to criminal prosecution under Article 90 of the Trade Union Act (imprisonment of up to two years or a fine of up to KRW 20 million).
Disputes Over Bargaining Subjects
Even where the prime contractor participates in the procedure, disputes may arise over which subjects must be bargained:
- Recognized working conditions: If the Labor Relations Commission has recognized employer status over a particular working condition, the prime contractor may not refuse to bargain over it without justification.
- Unrecognized working conditions: A refusal to bargain over subjects for which employer status has not been established would not readily constitute an unfair labor practice.
- Mutually agreed subjects: Beyond conditions for which employer status has been formally recognized, the parties may agree to include any subject as a bargaining item.
Where disputes over bargaining subjects are anticipated, it is advisable to seek a preliminary assessment from the Ministry of Employment and Labor’s ‘Collective Bargaining Review Support Committee’ before bargaining commences, or to use the Labor Relations Commission’s unfair labor practice remedy procedure for a binding determination.
Important Exception: Unions That Bypass Channel Unification
A prime contractor cannot be held liable for an unfair labor practice for refusing to bargain with a subcontractor union that has failed to undergo the bargaining channel unification procedure before making a bargaining demand. Compliance with channel unification is a prerequisite for the subcontractor union’s demand to receive legal protection.
7. FAQ
Atlas Legal, based in Songdo, Incheon, provides specialized corporate advisory, corporate dispute resolution, and corporate criminal defense services. With the amended Trade Union Act now in effect, inquiries from in-house legal teams at prime contractor companies — particularly regarding employer status assessment and bargaining response strategy — have been increasing significantly. Proactively analyzing whether your company qualifies as a non-contract employer, determining the appropriate scope of bargaining subjects, and implementing procedures to prevent unfair labor practice exposure are essential steps in managing legal risk under the new regime.
Source
This article is based on the following official government resource.
Ministry of Employment and Labor (Korea) Official Notice | Prime Contractor–Subcontractor Mutual Prosperity Collective Bargaining Procedure Manual (February 2026)
※ The information in this article is based on the Prime Contractor–Subcontractor Mutual Prosperity Collective Bargaining Procedure Manual (Ministry of Employment and Labor and National Labor Relations Commission, February 2026) and related statutes, and is intended for general informational purposes only. Legal outcomes may vary depending on the specific facts of each case. Please consult a qualified attorney before taking any action in connection with an actual matter.